Appreciate your tenacity to get this in the air! Those big props with a hand toss were scary. Glad you still have your ear intact... Interesting experiment. Thanks for sharing!
Exactly what I was thinking. Maybe it would be interesting to explore VTOL with this design. Put the engine mounts on some kind of rotating mechanisms.
I love the osprey - but the complexity of tilting the entire engine, and yet having a transverse gearbox to bring power across to the other motor in the event of a power failure blows my mind. I’d love to fly one - but I wouldn’t volunteer to be a test pilot on them. For my use - I like the idea of tailsitter FPV stuff where the camera pivots for hovering operations, and then tilts to follow the relative wind as the plane transitions is pretty cool. One day. One project at a time.
@usefulaircraft I recall Painless360 posted some videos on setting up iNav for transition from vertical to horizontal, but not exactly what you're describing describing. Could be a starting point though.
One day I’ll get back to playing with tailsitters. There are somethings I really like about them. It’s on the list - it’s just a question of time. Thanks for your comment.
Yeah - it was one and done. Underhanded may have been a better idea - but I have no intention to revisit this project - it was a little hazardous. I appreciate your comment - I should have thought about the underhanded throw.
I loved the sound of them airborne, and I do love watching the V22’s. I’ve seen a few close up at different airports and off field locations. I think they’re an amazing plane and I hope they find civilian applications. I’m a helicopter pilot as well as a FW guy- so I’d love to fly them.
Really like your content - asking again but hopping I'm not bugging you - what laser cutter are you using? I know its old - but that means it might be available cheap.
I must have missed your earlier question. The Laser is a G. Weike LC1290 - with a 100W RECI tube. I run it with a Rudia controller, and Lightburn on a cheap pc for a driver. The water chiller is a CW-5200. Otherwise I’ve got a generic fume extraction fan, and a small compressor for air assist. It’s been a workhorse for many years. Let me know if there is anything else I can tell you.
My wife will assure you - I can be very unburdened by knowledge - especially in the garage with a beer or two. That’s how you end up building planes like this one. Thanks for your comment!
And more lift: the propeller wash should counteract the wing vortices, lowering induced drag Looking at that first toss, it seems like the propwash in conventional arrangement was forcing the wing to work even harder to make any useful lift, keeping it from gaining any altitude
My choice to have the propellers rotate inboard was not accidental. I’m sure you’re familiar with P-Factor. It’s what causes the descending blade of the propeller to generate more thrust than the ascending blade - particularly at high angles of attack and high power settings. So I had to decide how to best use this to my advantage. As I was solving for slow flight (I fly in a confined park) - I felt it best to have the counter rotating props turn inboard so that as I was operating close to a stall - that thrust vector would be closer to the centerline of the aircraft in the event of any difference in throttle response. This configuration is common in multi engine training aircraft. While it is true there are planes where the propellers counter rotate outboard have better performance, they sacrifice low speed handling and will have a higher minimum controllable airspeed. I had already fought a defective ESC, and had motors that didn’t spool up at the same speed - so I chose inboard rotation to further minimize any additional potential asymmetry.
The inability of the conventional (tail) designs to fly was because the elevator could not generate the pitching moment at the speed of my throw. Had I launched into a stiff wind, or by means to gain a higher airspeed - it would have flown. The wing is an inverted KFM - its lift is a direct function of angle of attack. The plank design is actually hindered by the fact that the elevon shares the duties of an aileron and an elevator. Furthermore - when elevons are functioning as an elevator, their effective arm (in a plank) is much shorter than in a conventional design where the elevator is much further aft. The saving grace in my build was that the entire wing (save 20mm at the root) was in the direct induced flow of the propeller - and thus had the effect of power steering (by the induced flow being vectored by the elevon when the motor was powered). Before I flew it - I would hold the airplane at the CG, and could feel the pitch and roll forces while the propellers were turning. As far as the wingtip vortices - they were swimming in a confused sea. The propellers extended 80mm beyond the wingtips. It was an interesting exercise, and I learned a few things, but I have no desire for a carbon fiber haircut - so that plane is parted out.
Fun video today! Sometimes it good to push the limits and extremes. On that note, what do you think about a sub 250 sailplane (max wingspan two fome boards) and a really small efficient motor that barely keeps aloft between thermals 😊 Google sophisticated lady sail plane RC
I started with gliders and whatnot - I do enjoy them. My very first build was an old Wanderer glider. That plane was a monster to transport - but flew at a walking speed. That said - I live in Arizona - so I may not be the best judge of what a good thermal plane is - out here it gets so hot you could toss a rock into the air and it may catch a thermal and fly away. It’s been a long hot summer. Thanks for your comment. You’ve planted a seed.
![Seungmin "그렇게, 천천히, 우리(As we are)" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/kAzmhLHePqU/mqdefault.jpg)
Appreciate your tenacity to get this in the air! Those big props with a hand toss were scary. Glad you still have your ear intact... Interesting experiment. Thanks for sharing!
Yeah - that was a one and done. Those props extended 80mm beyond the wingtips.
Thanks for your comment!
Nice job, I'd watch some live builds. 😀
I may give it a try. Thanks for your comment!
Looks like an Osprey.
Exactly what I was thinking. Maybe it would be interesting to explore VTOL with this design. Put the engine mounts on some kind of rotating mechanisms.
I love the osprey - but the complexity of tilting the entire engine, and yet having a transverse gearbox to bring power across to the other motor in the event of a power failure blows my mind. I’d love to fly one - but I wouldn’t volunteer to be a test pilot on them.
For my use - I like the idea of tailsitter FPV stuff where the camera pivots for hovering operations, and then tilts to follow the relative wind as the plane transitions is pretty cool.
One day. One project at a time.
@usefulaircraft I recall Painless360 posted some videos on setting up iNav for transition from vertical to horizontal, but not exactly what you're describing describing. Could be a starting point though.
You should set that thing up as a tail sitter lol it definitely have plenty of prop it could probably hover for an hour 😅😂
One day I’ll get back to playing with tailsitters. There are somethings I really like about them.
It’s on the list - it’s just a question of time.
Thanks for your comment.
Seems like something you'd want to do an underhand toss from near the rear of the fuse.
What a monster of a plane though, great flight
Yeah - it was one and done. Underhanded may have been a better idea - but I have no intention to revisit this project - it was a little hazardous.
I appreciate your comment - I should have thought about the underhanded throw.
you want some airplane with those props?
You should put a flight controller in that and make it a tail sitter
I'll get back to tailsitters... if only there were more hours in the day!
It sounds just like my BlitzRCWorks V-22 Osprey VTOL in forward flight with the huge props, lol
I loved the sound of them airborne, and I do love watching the V22’s. I’ve seen a few close up at different airports and off field locations. I think they’re an amazing plane and I hope they find civilian applications. I’m a helicopter pilot as well as a FW guy- so I’d love to fly them.
Really like your content - asking again but hopping I'm not bugging you - what laser cutter are you using? I know its old - but that means it might be available cheap.
I must have missed your earlier question. The Laser is a G. Weike LC1290 - with a 100W RECI tube. I run it with a Rudia controller, and Lightburn on a cheap pc for a driver. The water chiller is a CW-5200. Otherwise I’ve got a generic fume extraction fan, and a small compressor for air assist. It’s been a workhorse for many years. Let me know if there is anything else I can tell you.
@@usefulaircraft thanks!
you consider releasing your plans? im sure people would be very interested if you wanted to sell the plans
Take a look at usefulaircraft.com/shop
I've got the first set of plans out there for my FPV simple plank. You may like it.
I appreciate your comment.
She's giving me Osprey vibes... Maybe use two sheets for the plane sporting these?
Yeah - I’ve got some ideas stewing around. They won’t go wasted.
This guy as the same attitude as me. Of course I am not burdened by all of that knowledge and experience….
My wife will assure you - I can be very unburdened by knowledge - especially in the garage with a beer or two. That’s how you end up building planes like this one.
Thanks for your comment!
I sub i hope you get to a 1000
Thank you!
Spin props outwards you will have more control. Unconventional twin motor prefer outwards spin.
And more lift: the propeller wash should counteract the wing vortices, lowering induced drag
Looking at that first toss, it seems like the propwash in conventional arrangement was forcing the wing to work even harder to make any useful lift, keeping it from gaining any altitude
My choice to have the propellers rotate inboard was not accidental.
I’m sure you’re familiar with P-Factor. It’s what causes the descending blade of the propeller to generate more thrust than the ascending blade - particularly at high angles of attack and high power settings. So I had to decide how to best use this to my advantage. As I was solving for slow flight (I fly in a confined park) - I felt it best to have the counter rotating props turn inboard so that as I was operating close to a stall - that thrust vector would be closer to the centerline of the aircraft in the event of any difference in throttle response. This configuration is common in multi engine training aircraft.
While it is true there are planes where the propellers counter rotate outboard have better performance, they sacrifice low speed handling and will have a higher minimum controllable airspeed.
I had already fought a defective ESC, and had motors that didn’t spool up at the same speed - so I chose inboard rotation to further minimize any additional potential asymmetry.
The inability of the conventional (tail) designs to fly was because the elevator could not generate the pitching moment at the speed of my throw. Had I launched into a stiff wind, or by means to gain a higher airspeed - it would have flown. The wing is an inverted KFM - its lift is a direct function of angle of attack.
The plank design is actually hindered by the fact that the elevon shares the duties of an aileron and an elevator. Furthermore - when elevons are functioning as an elevator, their effective arm (in a plank) is much shorter than in a conventional design where the elevator is much further aft.
The saving grace in my build was that the entire wing (save 20mm at the root) was in the direct induced flow of the propeller - and thus had the effect of power steering (by the induced flow being vectored by the elevon when the motor was powered). Before I flew it - I would hold the airplane at the CG, and could feel the pitch and roll forces while the propellers were turning.
As far as the wingtip vortices - they were swimming in a confused sea. The propellers extended 80mm beyond the wingtips.
It was an interesting exercise, and I learned a few things, but I have no desire for a carbon fiber haircut - so that plane is parted out.
Fun video today! Sometimes it good to push the limits and extremes. On that note, what do you think about a sub 250 sailplane (max wingspan two fome boards) and a really small efficient motor that barely keeps aloft between thermals 😊 Google sophisticated lady sail plane RC
I started with gliders and whatnot - I do enjoy them. My very first build was an old Wanderer glider. That plane was a monster to transport - but flew at a walking speed.
That said - I live in Arizona - so I may not be the best judge of what a good thermal plane is - out here it gets so hot you could toss a rock into the air and it may catch a thermal and fly away. It’s been a long hot summer.
Thanks for your comment. You’ve planted a seed.
First !!