If I recall correctly, their loop allows them to get lifted up via wind being compressed against the hill (the plane can gain altitude for free) before moving away from the hill / updraft, and gliding at a steep descent to gain speed. Then once at the bottom of it's drop, it turns back over to the hill and gets boosted up again. This all happens in one big, smooth loop.
When I left norcal for the east coast 6 years ago, we were all amazed when Craig T and Dave R were fixin' to bust 200mph. It is utterly staggering how far things have come. I got to 165mph with a stock Wizard at Coyote Hills (with 15-20mph winds), and that was enough to get my heart racing. I absolutely cannot fathom the reflexes, coordination and concentration required to fly at this level. You guys are amazing. It's also a feat of engineering that the plane hasn't turned into confetti.
INCREDIBLE !! That craft is incredibly strong and the piloting SMOOTH to not plow the hill - WELL DONE !! This is a fantastic effort - the sound of it ripping through the air is fantastic !!
I watched this in 720p on a 22 inch screen and still could barely see the plane. The sound that thing makes is like thunder. Wicked. I'd say the camera/radar guy did a great job flying it too considering it isn't his plane. I'd be trembling too! Congrats on the new speed
This must be the fastest non powered sport in the world? Am I correct in translating the speed to 753 kilometers an hour? If so, that is seriously insane. Well done!
This is insane, and like many other aspects of the hobby it must be massively addictive chasing the limits and speed of the location and aircraft, great flying! This is amazing
The plane travels in circles BEHIND the peak, so on the upper part of the circle the wind is adding speed to the plane, much like a sail on a sailboat. When the plane continues the circle somewhere below the level of the peak the wind calms down and it flies in still air. (There is a turbulent layer and some turbulences, but that doesn't matter here) In the still air the plane can turn with precise conrol without losing any speed, continuing upwards to reach the wind zone and the cycle continues
Great video of some awesome dynamic slope soaring. Is the place you are flying at a popular place for slope soaring? I am looking for some places so I can teach my son how to fly and of course also for me. I used to fly over off of Temple Ave., and top of Grand. in DB.
@rcspeeds What does reading the original text or downloading the video have to do with me asking if the carbon fiber fuselage produce a good echo for the radar gun? I can see the plane just fine in the video. No need to load the other one
So, the lead is to keep the wings from snapping off from the weight of the fuselage? Wow! I was wondering why in a frame at 4:15 why the wings were not arcing up. Looked like they were flat. Fantastic idea! I suppose no matter how tough the wings were constructed, in turns that tight, it would snap them right off. Now I understand how they stay so flat during the turn.
OMG, I had no idea a slope soaring glider could do such things!!! I've always thought of gliders as graceful gentle flyng aircraft, all I can say is WOW!!
@tahoeskiier Yea, I understand, its hard to see the plane when it's going over 400 but if you read the original text below the video you can download the original file at rcspeeds(dot)com. THen at1080P, if watched on a decent computer you can see it,,, sorry bout that. Sounds much better too without the RUclips compression. Chris
Oh wow! I know exactly where that is!!!! Used to fly here in the early to mid 80's before they built so many developments! We used to call this section of the ridge the Vacuum Cleaner. Flew just south of here on the hill above Cresta Verde Park. We called that one suicide hill. Myself and only a very few other guys ever flew this area. I started flying here after seeing a guy on an old school hang glider sloping this ridge for over an hour before landing back up on top. Very curious as to where your landing zone is? This ridge is very rocky and boulder strewn with lots of thick tumbleweeds. Best bet always seemed to get enough altitude to penetrate the lift and line up behind the ridge to hover in and catch the glider by hand. This ridge was about the best kept secret in all of Southern California. Wondering what and where you access the ridge from today? With all the development and a radio repeater site located on "Suicide Hill" certainly seemed to ruin this place. Especially all the changes to terrain that upset a section of ridge to the south. Back in the day looking to the west was just an empty valley with a dry lake bed and an old dozer half sticking up from the dried up mud. To the east was nothing at all but a dirt road where McKinley is now. The road led to an old goat farm. Just beyond that and off of Buchanan was the old Corona Raceway and MX track. Lots of dirt bike trails inbetween. Damn, I miss sloping here! Please contact me if anyone has plans to slope here! I would love to spectate, maybe even build a sport slope plane or even a foaming flying wing to take up here and spend the afternoon with a glider and sixpack of glider fuel!!!!!! One more comment,,, last time I flew here, I brought my Kyosho Concept 30SR and pretty much mostly autogyro'd the ridge! It was awesome shooting rolls at eye level with the heli! Pretty much used to be able to fly anything off this Ridge. Kludge some servos to a cinder block and it might fly!
... and then to pass the record-breaking plane over to your mate to have a blast: that's why I love this hobby :o) Congrats on a the 405PB and the new Record! :D
What a coincidence; I grew up in riverside and did plenty of messin' around in those thar hills, and it also happens to be that I just finished a glider kit I had started 3 years earlier--a dynaflite talon lol. I imagine when it's not santa anna winds out there the SW's keep things nice? Its cool that you guys broke the world record (for now) there! One of the few good remaining things about IE these days, plentiful windy slopes!
Congratulations!!! absolutely amazing speed record. thanks for sharing. when I think of all the money I have spent to get my powered planes moving and only tapped 130 mph, my jaw just dropped watching this. I have no idea how you two were able to control the plane at the speed and in that wind. just one little wing dip and BOOM! ps whats with the dislikes?
I think the reason shes going 701 Kph is because shes saoring up n down in a nearly vertical circle, as shown in her video and she appears to be making tighter revolutions with each pass until the glider is literally catching up with its own tail! Most likely that kind of speed is being obtained because the build-up and release of energy is happening at much faster rate.
i'm not one of the ones saying that gps data should be used for this. i understand why it would not be accurate. what is it called when the gps data is corrected by inertial reference systems, like accelerometer data? a friend who used to work aboard a nucular sub explained a similar system, where inertial references were used exclusively underneath the polar ice cap for navigation/positioning.
I don't think it was the raw speed we were talking, it was the point of being able to pick up such a relatively small object. And we were speculating on what we would do, or better ways, to our knowledge, that would work. Of course we don't have the specifics on your equipment. If you have optimized equipment then that's awesome, and I can wait to see more of your amazing videos. So, with all due respect, I would ask you lay off slightly. Im used to Quadcopters, normal GPSs work just fine.
Beautiful video. Time 6:20, Spencer, "405" - Chris, "Oh that's it dude, that's all I want." I love it, that made me laugh. That's fast! That would be enough for me too Chris! Nice work Spencer, as always. Best regards, Steve Rainbow
Why is the guy calling speeds different to what the speed meter is showing? hes adding around 20-60 mph on each run. he calls 464 when its clearly 406~? 3:00 mark. Unless there's another speed meter off screen I'm not seeing?
thanks. they complement each other well. i wonder when we will see the technology in common use for model planes? on my wish list is also inexpensive hi-def video transmission, and wide angle wrap around view video goggles, antenna trackers on board the aircraft. working on the airframe already. oh, yea, and i want better batteries too. and everything else smaller. i'm not asking for too much am i?
@askii3 That was addressed by Dr. Mark Drela's, (MIT Professor). Spencer's guess is that if the gun could have caught the two passes after the 468mph pass, we'd have seen around 480mph. Combine that with Mark Drela's plot of ground speed and it reveals that the probable max groundspeed was over 520mph on the un-radared dive in part of the circuit. Air speed probably something around 550mph... More information and Dr Drela's pdf file: Search "rcgroups Dynamic Soaring 468 world record"
@Magoebaskloof Every radar gun that I've ever seen calculates speed by measuring the doppler shift of the returned radar signal. It is very consistent, very accurate and any error from misalignment (called cosine error by radar guys) only lessens the measured speed. It is not possible to measure a speed in excess of the objects true speed. It is consistent and accurate enough to hold up in traffic court and allow municipalities to collect from speeders...
I wonder what kind of airspeeds are achieved around the flight path? If it's going 468 relative to the observer and climbs into the horizontal wind shear that goes from 0 to 60+ component then the TAS is easily over 500mph, even with the plane entering the shear at an angle. Time to begin designing for supersonic flow! lol awesome
WOW!!! That is so cool!!! & right in our backyard! I'm in Rancho Cucamonga! Met up with John at the local park/field & he's trying to get myself & Robeert0 up there to check it out! Congrats with the speed/video!!! Puts my Habu's 117mph to shame, LOL!!
@n3iyr There is no rudder and yes very small corrections. Also, most DS planes that go over 250/300mph have different rates for different speeds. Chris
@turdsurfer This is 'proper' DS... The different airmasses are the 65mph wind on the front of the hill versus the approximately still air on the back side of the hill. In the video, whenever we are DSing, you're looking at the back of the hill at the still air. The launch shows the front side of the hill where the wind is. Hope this helps.
As the wind passes over the mountain a low pressure area is developed on the back side. This low pressure area sucks some of the wind that has passed over the mountain back into a vortex called rotor draft. The rotor spins like a wheel that would be rolling down hill. If the pilot can keep the plane on the perimeter of the rotor (and the plane holds together) it will gain energy in the dive portion of the circuit and then get sucked back up again, effectively maintaining speed and building it.
Would you mind giving me a basic lesson on what you are doing here? I mean I get that it's an RC Sailplane (I think) going F'ing FAST. But I don't understand how you do it. So very cool! So very interesting!
The Lead; it also adds weight, (we want the planes to be heavy, to have a high wing loading) and since weight is along the wing the center of mass will be at some distance from the fuse,,, Helps to increase Moment of inertia...
How accurate is the speed determined? Radar gun needs to be in straight line. For instance a car comes down straight line th radar flags it, and then it measures the time in between the flagging. Are these gliders measured between 2 points and time???? Just a question
I think accurate speed measurement can just provide a pitot system on the plane. This radar guns made for measuring objects wich move in a streight direction, not on a radius. In the radius Your plane make a longer way beetween two points, its mean the plane is slower than the radar gun says.
@00RSZEX I would think pretty close to 500mph... Because of the way Dynamic Soaring works the actually air speed is faster than the ground speed. We use very accurate radar to measuer the speed of the airplane relative to us but the plane comes up the ridge and slams into a 70mph head wind, that day, which adds more speed. Figure that the plane had an air speed of about 540mph or so at some point in that fight.
yes boys and girls 468mph... wait for the later part of the video to see a better view of the circuit.. It really puts the speed helicopters to shame! whats the record at the moment for a model helicopter... less than 200mph isnt it? I would love to give that a go but lack the funds required to build the heli required to do it!
I did the maths a while back but not for this flight, its certainly in the region of 30g! The model is 2.5metre wing span, if you assume a circle you can guestimate the size of the circle from video/wing span the rest is just maths :-)
We’ve had the g’s recorded many times. The machines used fail at 100gs and these planes make them fail. At the top of a Dynamic Soaring turn just after crossing the shear the radius becomes very small because of a maneuver called "Banging off the top". Imagine the compressed air flowing over the ridge and a model just coming out of the wind shadow created by the ridge. Here just after penetrating the shear, the pilot yanks the elevator to get every last drop out of speed. Centripetal acceleration is calculated by V^2/r. The Max velocities are at the shear crossing and with the help of a bangin top turn the radius a minimum...
Those speeds are not far away from when compress-ability starts to kick in. Supercritical airfoils maybe in future? On the other hand with those airfoils it would be hard to reach those high speeds initially. Any solutions on sight?
Honestly, how do you control it? how do you keep it in a loop pattern so easily? And with no engine how does it create thrust? Sorry if it's obvious, it's just really interesting.
An amazing feat. Those things just don't look stout enough to handle that kind of speed.Very streamlined fuselage but when you think of a model going so fast you think of a short stouter wing, possible highly swept. If a hawk or vulture popped over the ridge at the wrong time it could get real messy.
@oakleymac1 There was a g meter and it maxed out just under a hundred G's. The data is available on a RCGroups thread. You can get to the thread by searching Google with the words, (Kinetic world record 468 data). It will be the first search result top of the page.
@rudy8278 When I look down at the Radar Gun at 3:40+++ you can see how. I have an HD-Sound recorder separate from the camera. It has a wind guard on it too. The sound and the video are compiled later. Otherwise the sound isn't that good. One more thing the recorder is on the backside of the hill where there isn't as much wind. Even during the launch the sound was recorded in the lee of the wind...
Damn that's awesome, how do you manage to control it at those speeds. I have enough trouble at 40 mph and you guys exceed 10 times that. Impressive to say the least.
I got the NEED FOR SPEED!! What kind of radar gun do you need to get readings at that speed? I gotta try this! (Hopefully without hitting myself in the head with it)
The glider "lapped" every 3 seconds near the end. Assuming jet speed is constant over a lap (which is a pretty accurate assumption for high speeds regardless of the change in elevation during a lap), and a circular flight path (probably pretty accurate too), that works out to a radial acceleration of 44g. So each wing has to support 22 times the weight of the jet, assuming the wings are the dominant source of aerodynamic lift. The real killer in the design is probably the bending moment where each wing is attached to the body.
That is an ingenious method. So, the fuse is just along for the ride! Ha ha! After thinking about it, I understand why a GPS wont work either.. the refresh rate being too slow for such tight circles. Probably shows up as a star pattern if tried. You guys are a bunch of mad scientists! Ha ha! Keep up the good work, all the best, and Happy flying!
@tahoeskiier Sorry TahoeSkiier, I responded to the wrong comment. No these planes are hard to get on the radar we have tried many types of reflectors, (corner, metal under the paint, in the paint and small strands of metallic fibers) to enhance reflection. They are quite stealthy. We think more because of shape than Carbon.
WOW!! Great video of a great record! I did the backwards math - speed in feet/sec, approximately 3 sec per pass) and got a diameter of 655 ft for the roughly circular flight path. Is that about right?
A 655ft diameter seems reasonable from what I could see in the video. When I could even see the plane, of course. Assuming the camera had a NTSC-like framerate, ~30 frames a second is pretty much going to limit the view of a motherfucking natural-energy-sucking speed demon from hell contraption going 468mph *maybe* 1 frame to be captured. The thing is seriously so fast it's practically invisible to that camera. This is exactly the principle on which The Flash operates. This glider is like actual superhero shit, on video. But it has the superpower of invisibility against cellphone cameras, causing a video taken by one to be a paradox. Bow, mortal. Edit: The flightpath may be more elliptical than circular, so the backwards math might need calculus. But 655ft across is something I'd totally believe based on the video perspective and 6-7 foot-ish wingspan.
Those rc jets are closing in on these gliders. Currently 440 mph is current world record for rc jets (confirmed by Guinness world records, unlike this one).
@GEARSCOMBATANT1 We use flaps to slow the plane down. If you got to my channel and view other videos you can see landings. In fact in one video, (NyxAcroSounds@Weldon.mov) I catch a lighter DS plane and in another, (The incredible ThunderMaster goes 425mph!!) you can see a 77lb/200” plane first fly up too 425mph then land. Both landings you can see the flaps are deployed and both videos are taken at the same site. Chris
Jeezus Christ man! Holy sheet! I didnt even notice at 1st what the hell you guys were flying...I was thinking "what the heck are they shooting"? lol How do you handle wing loading pulling turns like that??? Titanium main spar???
Very cool, congrats guys! Dude over on another thread just insisting that's it's impossible to go faster than the wind is blowing-tried to direct him here but not sure if he watched or not.
If I recall correctly, their loop allows them to get lifted up via wind being compressed against the hill (the plane can gain altitude for free) before moving away from the hill / updraft, and gliding at a steep descent to gain speed. Then once at the bottom of it's drop, it turns back over to the hill and gets boosted up again.
This all happens in one big, smooth loop.
When I left norcal for the east coast 6 years ago, we were all amazed when Craig T and Dave R were fixin' to bust 200mph. It is utterly staggering how far things have come. I got to 165mph with a stock Wizard at Coyote Hills (with 15-20mph winds), and that was enough to get my heart racing.
I absolutely cannot fathom the reflexes, coordination and concentration required to fly at this level. You guys are amazing.
It's also a feat of engineering that the plane hasn't turned into confetti.
INCREDIBLE !! That craft is incredibly strong and the piloting SMOOTH to not plow the hill - WELL DONE !! This is a fantastic effort - the sound of it ripping through the air is fantastic !!
I watched this in 720p on a 22 inch screen and still could barely see the plane. The sound that thing makes is like thunder. Wicked. I'd say the camera/radar guy did a great job flying it too considering it isn't his plane. I'd be trembling too! Congrats on the new speed
This must be the fastest non powered sport in the world? Am I correct in translating the speed to 753 kilometers an hour? If so, that is seriously insane. Well done!
I'm waiting at any moment to see that flicker of water vabor/condensation over the wings and hear a bang. That is incredible. Hats off to you.
This is insane, and like many other aspects of the hobby it must be massively addictive chasing the limits and speed of the location and aircraft, great flying! This is amazing
The plane travels in circles BEHIND the peak, so on the upper part of the circle the wind is adding speed to the plane, much like a sail on a sailboat. When the plane continues the circle somewhere below the level of the peak the wind calms down and it flies in still air. (There is a turbulent layer and some turbulences, but that doesn't matter here) In the still air the plane can turn with precise conrol without losing any speed, continuing upwards to reach the wind zone and the cycle continues
Great video of some awesome dynamic slope soaring. Is the place you are flying at a popular place for slope soaring? I am looking for some places so I can teach my son how to fly and of course also for me. I used to fly over off of Temple Ave., and top of Grand. in DB.
How the heck did that thing stay together! No wing or control surface flutter at all! Very impressive!!! Congratulations!
because most of the weight is in the wingtips, and the whole wing and servo assembly is optimized against fluttering
Does the carbon fiber produce a good reflection for the rada gun? I would imagine it does since it blocks rx signals from leaving the plane.
@AVKtt
The speed is measured in statute miles (5,280ft) per hour or 753km/hr...
Spencer, thanks, that was incredible. I would never think a model sailplane could go faster than a commercial jet.
And If I do a loop in my super cub 20 mph and don't throttle back it folds the wings... Pfff
Good point. I don't know about the kind of servos,
but what about the load on that wing too?
@rcspeeds
What does reading the original text or downloading the video have to do with me asking if the carbon fiber fuselage produce a good echo for the radar gun? I can see the plane just fine in the video. No need to load the other one
@rcspeeds even at 1080p its still hard to see, but I did see it. Its only there for 1 frame at a time.
So, the lead is to keep the wings from snapping off from the weight of the fuselage? Wow! I was wondering why in a frame at 4:15 why the wings were not arcing up. Looked like they were flat. Fantastic idea! I suppose no matter how tough the wings were constructed, in turns that tight, it would snap them right off. Now I understand how they stay so flat during the turn.
Holy $%@#! I wouldn't have believed it until the head mounted cam. Now that is amazing... Well done!
that is incredible.
OMG, I had no idea a slope soaring glider could do such things!!! I've always thought of gliders as graceful gentle flyng aircraft, all I can say is WOW!!
@tahoeskiier
Yea, I understand, its hard to see the plane when it's going over 400 but if you read the original text below the video you can download the original file at rcspeeds(dot)com. THen at1080P, if watched on a decent computer you can see it,,, sorry bout that. Sounds much better too without the RUclips compression.
Chris
Put a damn onboard camera man
already did... Just watch the damn video on my channel!
It would slow it down
Oh wow!
I know exactly where that is!!!! Used to fly here in the early to mid 80's before they built so many developments!
We used to call this section of the ridge the Vacuum Cleaner. Flew just south of here on the hill above Cresta Verde Park. We called that one suicide hill. Myself and only a very few other guys ever flew this area. I started flying here after seeing a guy on an old school hang glider sloping this ridge for over an hour before landing back up on top.
Very curious as to where your landing zone is? This ridge is very rocky and boulder strewn with lots of thick tumbleweeds. Best bet always seemed to get enough altitude to penetrate the lift and line up behind the ridge to hover in and catch the glider by hand.
This ridge was about the best kept secret in all of Southern California.
Wondering what and where you access the ridge from today? With all the development and a radio repeater site located on "Suicide Hill" certainly seemed to ruin this place. Especially all the changes to terrain that upset a section of ridge to the south.
Back in the day looking to the west was just an empty valley with a dry lake bed and an old dozer half sticking up from the dried up mud.
To the east was nothing at all but a dirt road where McKinley is now. The road led to an old goat farm. Just beyond that and off of Buchanan was the old Corona Raceway and MX track. Lots of dirt bike trails inbetween.
Damn, I miss sloping here!
Please contact me if anyone has plans to slope here! I would love to spectate, maybe even build a sport slope plane or even a foaming flying wing to take up here and spend the afternoon with a glider and sixpack of glider fuel!!!!!!
One more comment,,,
last time I flew here, I brought my Kyosho Concept 30SR and pretty much mostly autogyro'd the ridge! It was awesome shooting rolls at eye level with the heli!
Pretty much used to be able to fly anything off this Ridge. Kludge some servos to a cinder block and it might fly!
... and then to pass the record-breaking plane over to your mate to have a blast: that's why I love this hobby :o) Congrats on a the 405PB and the new Record! :D
What a coincidence; I grew up in riverside and did plenty of messin' around in those thar hills, and it also happens to be that I just finished a glider kit I had started 3 years earlier--a dynaflite talon lol. I imagine when it's not santa anna winds out there the SW's keep things nice?
Its cool that you guys broke the world record (for now) there! One of the few good remaining things about IE these days, plentiful windy slopes!
Congratulations!!! absolutely amazing speed record. thanks for sharing. when I think of all the money I have spent to get my powered planes moving and only tapped 130 mph, my jaw just dropped watching this. I have no idea how you two were able to control the plane at the speed and in that wind. just one little wing dip and BOOM!
ps whats with the dislikes?
I think the reason shes going 701 Kph is because shes saoring up n down
in a nearly vertical circle, as shown in her video and she appears to be
making tighter revolutions with each pass until the glider is literally
catching up with its own tail! Most likely that kind of speed is being
obtained because the build-up and release of energy is happening
at much faster rate.
i'm not one of the ones saying that gps data should be used for this. i understand why it would not be accurate. what is it called when the gps data is corrected by inertial reference systems, like accelerometer data? a friend who used to work aboard a nucular sub explained a similar system, where inertial references were used exclusively underneath the polar ice cap for navigation/positioning.
I don't think it was the raw speed we were talking, it was the point of being able to pick up such a relatively small object. And we were speculating on what we would do, or better ways, to our knowledge, that would work. Of course we don't have the specifics on your equipment. If you have optimized equipment then that's awesome, and I can wait to see more of your amazing videos. So, with all due respect, I would ask you lay off slightly. Im used to Quadcopters, normal GPSs work just fine.
How do you see it! I have enough trouble with my wanderer just floating around!
Simply amazing! How did you damp the wind noise on your camera? Which camera?
Beautiful video. Time 6:20, Spencer, "405" - Chris, "Oh that's it dude, that's all I want." I love it, that made me laugh. That's fast! That would be enough for me too Chris! Nice work Spencer, as always.
Best regards, Steve Rainbow
Why is the guy calling speeds different to what the speed meter is showing? hes adding around 20-60 mph on each run. he calls 464 when its clearly 406~? 3:00 mark.
Unless there's another speed meter off screen I'm not seeing?
thanks. they complement each other well. i wonder when we will see the technology in common use for model planes? on my wish list is also inexpensive hi-def video transmission, and wide angle wrap around view video goggles, antenna trackers on board the aircraft. working on the airframe already. oh, yea, and i want better batteries too. and everything else smaller. i'm not asking for too much am i?
What a fantastic vid. You guys are the talk of the town.
Can someone please expain tthe sounds?? Im really interested!
I'm guessing the winds are Santa Ana driven?
@askii3
That was addressed by Dr. Mark Drela's, (MIT Professor). Spencer's guess is that if the gun could have caught the two passes after the 468mph pass, we'd have seen around 480mph. Combine that with Mark Drela's plot of ground speed and it reveals that the probable max groundspeed was over 520mph on the un-radared dive in part of the circuit. Air speed probably something around 550mph...
More information and Dr Drela's pdf file: Search "rcgroups Dynamic Soaring 468 world record"
how does one learn to do this? anything special needed Glider wise to try this? (not these speeds) but just to get the hang of it?
How do you even manage to control the model at that airspeed? Happy landings!
How do you even see the thing. I can barely see the glider in the video. Cool video!!!!!!!!!
That is amazing. I wonder what kind of g forces the airframe is experiencing.
@Magoebaskloof
Every radar gun that I've ever seen calculates speed by measuring the doppler shift of the returned radar signal. It is very consistent, very accurate and any error from misalignment (called cosine error by radar guys) only lessens the measured speed. It is not possible to measure a speed in excess of the objects true speed. It is consistent and accurate enough to hold up in traffic court and allow municipalities to collect from speeders...
I wonder what kind of airspeeds are achieved around the flight path? If it's going 468 relative to the observer and climbs into the horizontal wind shear that goes from 0 to 60+ component then the TAS is easily over 500mph, even with the plane entering the shear at an angle. Time to begin designing for supersonic flow! lol awesome
WOW!!! That is so cool!!! & right in our backyard! I'm in Rancho Cucamonga! Met up with John at the local park/field & he's trying to get myself & Robeert0 up there to check it out! Congrats with the speed/video!!! Puts my Habu's 117mph to shame, LOL!!
@n3iyr
There is no rudder and yes very small corrections. Also, most DS planes that go over 250/300mph have different rates for different speeds.
Chris
@turdsurfer
This is 'proper' DS... The different airmasses are the 65mph wind on the front of the hill versus the approximately still air on the back side of the hill. In the video, whenever we are DSing, you're looking at the back of the hill at the still air. The launch shows the front side of the hill where the wind is. Hope this helps.
Could a similar life size glider be built like that & flown with those speeds.
Once you have the flight angle perfect, how do you keep the glider tracking right? Is it done with mostly small aileron or rudder adjustments?
How do you fly these things?! can you even see it or do you just keep it at a set turning angle and wing it?
As the wind passes over the mountain a low pressure area is developed on the back side. This low pressure area sucks some of the wind that has passed over the mountain back into a vortex called rotor draft. The rotor spins like a wheel that would be rolling down hill. If the pilot can keep the plane on the perimeter of the rotor (and the plane holds together) it will gain energy in the dive portion of the circuit and then get sucked back up again, effectively maintaining speed and building it.
Would you mind giving me a basic lesson on what you are doing here? I mean I get that it's an RC Sailplane (I think) going F'ing FAST. But I don't understand how you do it. So very cool! So very interesting!
How you control that little thing at those speeds is beyond me! That's insane, but very, very cool!
Perhaps if you got some distance between the plane and the camera u we could see it ?
How does this work? I have never understood slope soaring.
@russ130657
Hey Russ, sorry didn't notice your questions. The Kinetic 240-300oz+!
How do you get it to go in the circuit and get to those speed?
Where is the glider? Not visible on the video!
love to have seen the landing and the celebrations :( well done amazing!
The Lead; it also adds weight, (we want the planes to be heavy, to have a high wing loading) and since weight is along the wing the center of mass will be at some distance from the fuse,,, Helps to increase Moment of inertia...
Pure awesomeness!!! 500 MPH looks like it will be soon!!
Congrats on the 468!!
it's called corrected gps data, correct?
@ChrisTechTV
search 'dynamic soaring on board' here on youtube and you'll find a video of just that...
How accurate is the speed determined? Radar gun needs to be in straight line. For instance a car comes down straight line th radar flags it, and then it measures the time in between the flagging. Are these gliders measured between 2 points and time???? Just a question
I think accurate speed measurement can just provide a pitot system on the plane. This radar guns made for measuring objects wich move in a streight direction, not on a radius. In the radius Your plane make a longer way beetween two points, its mean the plane is slower than the radar gun says.
@00RSZEX I would think pretty close to 500mph... Because of the way Dynamic Soaring works the actually air speed is faster than the ground speed. We use very accurate radar to measuer the speed of the airplane relative to us but the plane comes up the ridge and slams into a 70mph head wind, that day, which adds more speed. Figure that the plane had an air speed of about 540mph or so at some point in that fight.
Where's the glider?
yes boys and girls 468mph... wait for the later part of the video to see a better view of the circuit..
It really puts the speed helicopters to shame! whats the record at the moment for a model helicopter... less than 200mph isnt it?
I would love to give that a go but lack the funds required to build the heli required to do it!
wow the wings must be under a lot of strain.
I did the maths a while back but not for this flight, its certainly in the region of 30g!
The model is 2.5metre wing span, if you assume a circle you can guestimate the size of the circle from video/wing span
the rest is just maths :-)
30g .. That would do a pilot some damage lol
We’ve had the g’s recorded many times. The machines used fail at 100gs and these planes make them fail. At the top of a Dynamic Soaring turn just after crossing the shear the radius becomes very small because of a maneuver called "Banging off the top". Imagine the compressed air flowing over the ridge and a model just coming out of the wind shadow created by the ridge. Here just after penetrating the shear, the pilot yanks the elevator to get every last drop out of speed. Centripetal acceleration is calculated by V^2/r. The Max velocities are at the shear crossing and with the help of a bangin top turn the radius a minimum...
Neil Cooper
Damage? that would kill you.
Those speeds are not far away from when compress-ability starts to kick in. Supercritical airfoils maybe in future? On the other hand with those airfoils it would be hard to reach those high speeds initially. Any solutions on sight?
@rcspeeds
WoW from 468mp/h, how long did it take to stop?.
Honestly, how do you control it? how do you keep it in a loop pattern so easily? And with no engine how does it create thrust? Sorry if it's obvious, it's just really interesting.
How do you fly it if you can't see it?
where did you get the speedomter
An amazing feat. Those things just don't look stout enough to handle that kind of speed.Very streamlined fuselage but when you think of a model going so fast you think of a short stouter wing, possible highly swept. If a hawk or vulture popped over the ridge at the wrong time it could get real messy.
@oakleymac1
There was a g meter and it maxed out just under a hundred G's. The data is available on a RCGroups thread. You can get to the thread by searching Google with the words, (Kinetic world record 468 data). It will be the first search result top of the page.
@rudy8278
When I look down at the Radar Gun at 3:40+++ you can see how. I have an HD-Sound recorder separate from the camera. It has a wind guard on it too. The sound and the video are compiled later. Otherwise the sound isn't that good. One more thing the recorder is on the backside of the hill where there isn't as much wind. Even during the launch the sound was recorded in the lee of the wind...
Damn that's awesome, how do you manage to control it at those speeds. I have enough trouble at 40 mph and you guys exceed 10 times that. Impressive to say the least.
I got the NEED FOR SPEED!! What kind of radar gun do you need to get readings at that speed? I gotta try this! (Hopefully without hitting myself in the head with it)
How do you recover the plane without destroying it?
Cool! So when you are done flying and want to stop, do you just let it fly away or crash land :)
thats is incredible. so fast you can not even see it. i don't know how the n pilot can keep it in sight. great job
High speed camera would be nice for us to see what is there.
Wonderful. Well done. Incredibly fast.
Not sure if my calculations are right, but assuming a ~5 second lap time and 400 MPH, the glider must be *averaging* 23 g of acceleration.
The glider "lapped" every 3 seconds near the end. Assuming jet speed is constant over a lap (which is a pretty accurate assumption for high speeds regardless of the change in elevation during a lap), and a circular flight path (probably pretty accurate too), that works out to a radial acceleration of 44g. So each wing has to support 22 times the weight of the jet, assuming the wings are the dominant source of aerodynamic lift. The real killer in the design is probably the bending moment where each wing is attached to the body.
man! this is nuts! I really wish you could see the plane better!
you should mount the radar gun on the helmet as well
That is an ingenious method. So, the fuse is just along for the ride! Ha ha! After thinking about it, I understand why a GPS wont work either.. the refresh rate being too slow for such tight circles. Probably shows up as a star pattern if tried. You guys are a bunch of mad scientists! Ha ha! Keep up the good work, all the best, and Happy flying!
@tahoeskiier
Sorry TahoeSkiier, I responded to the wrong comment. No these planes are hard to get on the radar we have tried many types of reflectors, (corner, metal under the paint, in the paint and small strands of metallic fibers) to enhance reflection. They are quite stealthy. We think more because of shape than Carbon.
WOW!! Great video of a great record!
I did the backwards math - speed in feet/sec, approximately 3 sec per pass) and got a diameter of 655 ft for the roughly circular flight path. Is that about right?
A 655ft diameter seems reasonable from what I could see in the video. When I could even see the plane, of course. Assuming the camera had a NTSC-like framerate, ~30 frames a second is pretty much going to limit the view of a motherfucking natural-energy-sucking speed demon from hell contraption going 468mph *maybe* 1 frame to be captured. The thing is seriously so fast it's practically invisible to that camera. This is exactly the principle on which The Flash operates. This glider is like actual superhero shit, on video. But it has the superpower of invisibility against cellphone cameras, causing a video taken by one to be a paradox. Bow, mortal.
Edit: The flightpath may be more elliptical than circular, so the backwards math might need calculus. But 655ft across is something I'd totally believe based on the video perspective and 6-7 foot-ish wingspan.
sounds about right!
Who known -there is "miles" meant as "nautical miles" or statute?
@ChrisTechTV
search 'dynamic soaring on board video' here on RUclips and you'll see just that. An Opus around 250mph at Weldon, ca...
Those rc jets are closing in on these gliders. Currently 440 mph is current world record for rc jets (confirmed by Guinness world records, unlike this one).
lol those wings must be very strong.
New speed is 513 goto rcspeeds.com for a complete listing of all speeds...
What material is that glider made of? Because it looks really fast and a fast plane means that it is very light.
Brilliant but did you land it?
@GEARSCOMBATANT1
We use flaps to slow the plane down. If you got to my channel and view other videos you can see landings. In fact in one video, (NyxAcroSounds@Weldon.mov) I catch a lighter DS plane and in another, (The incredible ThunderMaster goes 425mph!!) you can see a 77lb/200” plane first fly up too 425mph then land. Both landings you can see the flaps are deployed and both videos are taken at the same site.
Chris
Jeezus Christ man! Holy sheet! I didnt even notice at 1st what the hell you guys were flying...I was thinking "what the heck are they shooting"? lol
How do you handle wing loading pulling turns like that???
Titanium main spar???
Very cool, congrats guys! Dude over on another thread just insisting that's it's impossible to go faster than the wind is blowing-tried to direct him here but not sure if he watched or not.
wow, just wow. I did a quick calculation, and a 300-ounce plane at 468 mph has roughly the same amount of energy as 90 lbs of TNT. Damn!
What powers this plane?
Now to land this thing how just how???