When you have 4 fans all in the same airflow, the pitch of the blades needs to increase with each fan. When you use all four fans with the same pitch, the three behind the first one aren't doing anything because the airflow is already up to the speed of the next fan. Each fan needs to do work in order to provide thrust to push the thing forwards. If you could 3D print your four fans with increasing pitch, every fan would contribute to making it go faster, Woof!
Perhaps also shape the intake side like a speed stack, so it can grab more air. Maybe also put a reversed cone on the back where the fast flowing air can drag in more ambient air to accelerate it. Like a rudimentary air multiplier.
Propellers aren't like wheels with perfect grip, increasing pitch could possibly improve performance, but all the propellers contributes in this case. At low speeds and low loads additional propellers might cause more drag than thrust, but in this case, feeding 100 V to 12 V motors, and even som undisclosed voltage, possibly even higher than 100 V, also accelerating from a standstill, that situation is very very far from an idealized idea of how a propeller works. Also, he had the second motor spin in the opposite direction, which turns the rotation of the air the first motor caused into directional thrust. That can actually improve efficiency compared to having just one propeller.
You should add stators too, i think. Rotors add spin as well as linear movement, stators (in a steam or gas turbine) turn that spin back into axial movement.
personally i would suggest using larger loco wheels - eg steam loco wheels to give the larger turning radius which will help give you theoretical higher speeds, look at land speed road vehicles they always have large wheels
Nice video. It might be good to consider Ohm's law, you don't double the power when you double the voltage over a given resistance, you quadruple the power when you double the voltage over a given resistance, as doubling the voltage makes the amperage double. So, as your motors represent a given resistance, the actual power changes with the square of the change in voltage. That means, increasing voltage from 12 to 100 volt increases the power almost 70 times, disregarding the increased losses in the conductors. And that is assuming other things, like that the connection is still maintained. So, if your speed doesn't increase much when you double the voltage, your system have some issue, and resolving that should help more than increasing power even further. As long as you're still accelerating, the fact that kinetic energy also increases with v² (the square of the velocity) means the increase in velocity should be the same as the increase in voltage, when disregarding friction and other aspects. But at low speeds the acceleration should be roughly the same as the increase in voltage. Aerodynamic drag typically have little influence in such speeds, but that also increases with v², but as velocity increase that means your fighting that increased drag of a longer distance in a given amount of time, which makes the power required to overcome drag increase more than v². But, at a few mph (true) speed drag typically have little influence. If you're going to push this further, which seems like a good idea, you might want to try a longer track, and measure if the speed still increases significantly at the end. Maybe try creating some downforce.
Hey Sam, after seeing your lastest loco its safe to say you are a master of 3d printing. Just a suggestion, what if you tried to 3d print some scenery or railway infrastructure?
Well, I'm impressed, and the upcoming November 5th celebrations suggest how this project could be taken a step further, as follows: Step 1: Visit your local dodgy-looking Fireworks Emporium. Best to extinguish all cigarettes before entering. Step 2: Ask for their most powerful, largest and really scary Rocket. Ignore the warning labels plastered all over it. Step 3: Carry it home. Avoid passing the local Police Station. Step 4: Manoeuvre Rocket up into your loft, carefully demolishing walls as necessary. Step 5: Glue Rocket to a handy HO scale loco. Mr Stephenson's iconic design seems appropriate... Step 6: Check that your House Insurance covers 'All Risks'. You can't be too careful, you know. Step 7: Collect together all available fire extinguishers, hoses, buckets of water etc. Safety First, remember... Step 8: Light the blue touch paper. Run! Step 9: Realise that the GoPros were not turned on to immortalise the results. Whoops. Step 9.5: Repeat from Step 1. That gives you a whole year to rebuild the house...
you know, something that might be up your alley are slot car motors. ive seen readings to 50k rpm and above. they are also usually the same size and shape as those can motors in most model trains. i could only imagine how much power those would draw through the rails though. maybe some carbon brushes against the rails directly? thanks for the vid!❤
All good fun Sam, but be careful....above 50v is considered dangerous to health. But most importantly you are using a variac which is a variable auto transformer...and is not isolating. This means one rail could easily be at mains potential and therefore potentially life threatening. Keep safe 👍
Hey Sam. I am noticing your camerawork is getting really good. You have picked a very good angle for your talking shots. And the lighting is perfect. Just Wow 👏 Keep having fun with your filming techniques 😂
One way to get a little extra speed from the propeller version is to hold the car in place until the props come up to speed. Take care if you're running at volts!
🤣🤣 You mad man LOL. Better start building a mini maglev with your amazing engineering skills and see how fast that can go hahah. 2000 mph at least we bet 🤣🤣 We just love your mad experiments 😄
seeing the insulating fishplates makes me think it would be fun to have the polarity reversed on the other side of them, to both have a jet engine style of braking, and potentially to create a shuttle up-and-back demo layout
Have you tried bullfrog snot to improve the traction? You'll probably have to apply it to the drive wheels and then have an extra axle just for the electrical pickup.
Oh yeah, maybe if you hide a motor and fan in those Walther’s tank cars you reviewed recently (and cut out the tank end caps) you’d have the fastest tank cars in ANY scale! 😄😄
Well done! Great video I've been waiting for a vid to come and its come! Keep up with the great content + videos. (You are also the only person i know who likes to risk there life, power bill and his trains for content!)
MEANWHILE on his second channel, Sam'sBubbleWrap... "Today we'll be testing the shock absorbing impact of the Riley 3822, which we all know to be exceptional in pop quality and surface integrity. I have these model trains set up to give it a good workout, so let's see how it stands up to some high-voltage impacts!" 🙂
Sam, believe it or not, several early electric locos in America were built like your dragster, having lots and LOTS of wheels because of the low torque, They ran on the legendary Milwaukee Road.
For the dragster, I'd ditch one of the motors. Drive only the front wheels, and use the back wheels for picking up power, that way you could run traction tyres on the driven wheels. Maybe run 2 rear axles just so it's only half the power through each pick up.
You ought to make a flipbook with steam engine stickers on each square paper page. You need as many square paper sheets (quite small, not tiny) as you want to make the book, a pen or pencil to mark the numbers on each page, a clipboard clip and some funky steam engine and scenery stickers. You can try creating the stickers with a 3D printer. Create the flipbook however you want to, and give it a name: Sam's Trains Flipbook. Or any fitting name you think of. Clamp the pages in order together with the clipboard clip on the left hand side, and flip away. Try it.
You need a bench power supply instead of using a non-isolated variac styel supply. This is extremely dangerous as you are not isolated from the mains power. The motors actually ran faster when the voltage dropped off when the pickups started arcing more. Also, I think the two motors were not synced with each other, and the fans were fighting each other, with a vortex being formed inside. It would likely run faster with 1 motor and only 2 fans. Stripping the tunnel off kind of lends some credence to the vortex issue I noticed in your dragster testing it was always derailing at the same point every time, so I feel it may have been the track causing the derailment rather than the wheels. The movement of the track would be more than the wobble of the wheels
bet that dragster could do a lot better with some proper downforce and rubber allowing it to get the power down… but then it’s probably more of a model dragster than a model train
That was one heck of a workhorse. You definitely have outdone yourself with this one. I’m not too much worried about speed, but would like to know if it’s possible to create a fan driven locomotive that can actually pull a train. Or better yet, one fan driven locomotive at each end of a passenger train or cargo train. That would be interesting to see. Keep up the wonderful work and thank you for doing these experiments, so we don’t have to. Cheers
Ah yes the mad scientist Mr. Sam's strains is back! Yes direct drive - remove all that stands between your wheels and POWEEEER. Very spectacular, so if there is a next time it will have to be on longer track and probably outside? Certainly can go faster, lighter materials, less solid frame (hexagons, triangles or what have you) higher rated motors, hobbyists have 12/24 as general use so there should be something in that range no doubt but there could be 42V as well. i imagine overclocking those could be fun. or at least scary.
Maybe you should go and film offsite, find a long hallway somewhere that you can set up a much longer track, and then try the dragster on that. Alternatively, you might get something out of giving the dragster some down force to reduce wheel slip.
I thoroughly enjoy all your videos Sam, but I LOVE the crazy experiment videos. My favorite was the brakes. With your new found engineering talent I bet you could make a new, improved model. It'd make a fun video at minimum. Thank you for your videos!! And maybe I'm being crazy, but you might even be able to make a little retrofit kit and sell them!
Hi Sam, what about trying a Sparklets/Soda Syphon/Soda Stream type CO2 cartridge? You'd need some kind of valve to release the gas instantly but you could trigger the release through voltage on the track.
You should do an aprils fools advert for the drag racer claiming that it is very safe, reliable and almost impossible to have a crash whilst there are clips of it falling over in the background
Time to start taking these experimental trains outside. A longer run would be better, and soon will be needed. Fun fact, you did break the sound barrier, in scale.
Put the faring on the front to increase the air density, then put a nozzle on the rear to constrict the air flow and increase air pressure against the fan blades. Also, see if there are other ways to decrease weight.
In the Saturn and other rockets, combustion takes place and the heated exhaust expands against the cone of the nozzle That does not take place here as there is no expansion.@@davidstaves6669
Good video, Sam. Very interesting. Re the dragster running at the higher voltages, I suspect your limiting factor is wheelspin. In this case you change from static friction between tire and rail to sliding friction, which would remain constant regardless of the wheels' rotational velocity. This would likely occur very early in the run since the weight of the vehicle is light, i.e. the normal reaction between wheel and rail would be low. This would possibly explain why you saw no speed improvement as the voltage and current increased. Maybe set up a funicular cog drive system using your fancy printers?🙂😀😁 (Pssst... btw, voltage goes across the motors and current goes through them)
I did the same thing with a hairdryer turbine fan/motor combo duct taped and wired to a lighted model passenger train. The model train went so fast it flew off the track.❤
I reckon that the turbo train might have been running into a problem that actual turbines run into, which is having fan after fan actually decreases efficiency which is why they have a static set of blades between each set, Granted that's for fans being moved by the air and not fans moving air, but I do think something similar might have been happening on the initial tests,
Wonderfully bonkers. Could you modify a Triang Hornby Battle Space Turbo Car? Might be worth remembering to wear insulating (vinyl?) gloves. Next step might be a wheeled variation on a Maglev?
1) take the passenger off of the front. It’s ruining your airflow 2) you ruined the fan efficiency by taking off the top half of the duct. Ducted fans need fully ducted and with a very tight tolerance between the blade tips and the ducting for maximum efficiency. With that fixed and thicker gauged pickup wire it will go much much faster.
Hi sam, love to see your inventions pushing the limits of modelling. Do you think an entirely self sufficient track cleaner would be possible? I know this must be the bane of many modellers existence. The dapol one is nice but not really abrasive enough if you ask me. I was just brain storming of building a grinder car with two spinning pads underneath, followed by dapol's car set to 'vacuum' mode followed by a tank car with cleaning cloth underneath, but it struck me that it was the kind of invention I feel you could take on. I don't mean to suggest but I would love to see you tackle it. sorry for the novel!
The thing that does not get scaled is the properties of the air. This is always the problem with scale models the natural elements do not scale. So in the real world of model testing, for air reduced pressure and humidity chambers are used, for water it replaced with lower surface tension fluids. etc.. Your dragster would be suffering from imbalance from any imperfections in is wheel structure, mounting or machining. The only way is to make wheels from solid rolled bar. The power pickups need also run on a smooth surface. Any arcing will cause pitting of the surface.
Use neodymium magnet to keep the vehicle on the track, shape the body like an inverted wing, and use a model rocket engine.this necessitates using it outside though...
When increasing speed, you need to think about the aerodynamics as much as anything. The rule of thumb is to double your speed you need to square your power on the same structure - so actually drag reduction (both aerodynamic and rolling) is very important
Decent video here Sam, even though they are not anything like the creation you have made here realistically I would say the fastest trains I have in my collection would probably be my hitatchi 395 javelin or my Eurostar
I think there is a limit on the dragster motors. I dont know the spec rotation per second max as designed, or how much past that you could reasonably go without frying it. I do wonder though about the wheel slippage. Any goo drag racer would tell you that areo is highly important. Being bith axles are powered....(I wonder if a half rotation difference between the two is also combating for dominance...) I would add a front downforce wing and a rear down force wing. Nothing extravengant. Just a flat panel above the front wheels and one above the cockpit. Just enough surface to provide enough downforce to keep the wheels engaged with the track. Imho. Lol This was loads of fun!
Gave this a like before I even watched it because I was thinking to myself - when will Sam do another... I'm not contemplating an HO scale rocket train... not at all.
20:44 is the scary sound for me! last time i heard that a Tornado was busy buzzing past my house when i was a young lad living in Northamptonshire a noise youll never forget once you have experianced a tornado in real life.
When you have 4 fans all in the same airflow, the pitch of the blades needs to increase with each fan. When you use all four fans with the same pitch, the three behind the first one aren't doing anything because the airflow is already up to the speed of the next fan. Each fan needs to do work in order to provide thrust to push the thing forwards. If you could 3D print your four fans with increasing pitch, every fan would contribute to making it go faster, Woof!
Perhaps also shape the intake side like a speed stack, so it can grab more air. Maybe also put a reversed cone on the back where the fast flowing air can drag in more ambient air to accelerate it. Like a rudimentary air multiplier.
Propellers aren't like wheels with perfect grip, increasing pitch could possibly improve performance, but all the propellers contributes in this case. At low speeds and low loads additional propellers might cause more drag than thrust, but in this case, feeding 100 V to 12 V motors, and even som undisclosed voltage, possibly even higher than 100 V, also accelerating from a standstill, that situation is very very far from an idealized idea of how a propeller works.
Also, he had the second motor spin in the opposite direction, which turns the rotation of the air the first motor caused into directional thrust. That can actually improve efficiency compared to having just one propeller.
You should add stators too, i think.
Rotors add spin as well as linear movement, stators (in a steam or gas turbine) turn that spin back into axial movement.
01:03 You forgot to mention the most important thing you added: Painted-on flames. Everyone knows that flames always make things faster!
truer words were never spoken
Red color works even better :)
Sam is really a mad scientist when it comes to model trains, thats for sure
hahaha thank you! ;D
@@SamsTrainsYEAH, TRIAL & ERROR!!!!
Kind of like Victor Frankenstein, but with model trains.
personally i would suggest using larger loco wheels - eg steam loco wheels to give the larger turning radius which will help give you theoretical higher speeds, look at land speed road vehicles they always have large wheels
And slower rotation too, less friction on the axle.
The melted blobs on the ends of wheel contacts may reduce the contact bounce (more wire mass at the end)
Hi Sam, I love your wacky experiments. I can't help wondering how fast a Hornby 0-4-0 would go at 100 volts 😉
21:26 I hear by declare this model ("The worlds Fastest Rail mounted object that Sam has ever made") Award, lol
Cheers Jasper & Willow
hahaha thank you!!
Fantastic vid sam, really enjoyed this! Those sparks off the wheels!
Nice video. It might be good to consider Ohm's law, you don't double the power when you double the voltage over a given resistance, you quadruple the power when you double the voltage over a given resistance, as doubling the voltage makes the amperage double. So, as your motors represent a given resistance, the actual power changes with the square of the change in voltage.
That means, increasing voltage from 12 to 100 volt increases the power almost 70 times, disregarding the increased losses in the conductors. And that is assuming other things, like that the connection is still maintained.
So, if your speed doesn't increase much when you double the voltage, your system have some issue, and resolving that should help more than increasing power even further. As long as you're still accelerating, the fact that kinetic energy also increases with v² (the square of the velocity) means the increase in velocity should be the same as the increase in voltage, when disregarding friction and other aspects. But at low speeds the acceleration should be roughly the same as the increase in voltage.
Aerodynamic drag typically have little influence in such speeds, but that also increases with v², but as velocity increase that means your fighting that increased drag of a longer distance in a given amount of time, which makes the power required to overcome drag increase more than v². But, at a few mph (true) speed drag typically have little influence.
If you're going to push this further, which seems like a good idea, you might want to try a longer track, and measure if the speed still increases significantly at the end. Maybe try creating some downforce.
Hey Sam, after seeing your lastest loco its safe to say you are a master of 3d printing. Just a suggestion, what if you tried to 3d print some scenery or railway infrastructure?
He did a small trolley for putting on his station! It would be nice to see more than that though!
Yes, for improving his layout.
Well, I'm impressed, and the upcoming November 5th celebrations suggest how this project could be taken a step further, as follows:
Step 1: Visit your local dodgy-looking Fireworks Emporium. Best to extinguish all cigarettes before entering.
Step 2: Ask for their most powerful, largest and really scary Rocket. Ignore the warning labels plastered all over it.
Step 3: Carry it home. Avoid passing the local Police Station.
Step 4: Manoeuvre Rocket up into your loft, carefully demolishing walls as necessary.
Step 5: Glue Rocket to a handy HO scale loco. Mr Stephenson's iconic design seems appropriate...
Step 6: Check that your House Insurance covers 'All Risks'. You can't be too careful, you know.
Step 7: Collect together all available fire extinguishers, hoses, buckets of water etc. Safety First, remember...
Step 8: Light the blue touch paper. Run!
Step 9: Realise that the GoPros were not turned on to immortalise the results. Whoops.
Step 9.5: Repeat from Step 1. That gives you a whole year to rebuild the house...
you know, something that might be up your alley are slot car motors. ive seen readings to 50k rpm and above. they are also usually the same size and shape as those can motors in most model trains. i could only imagine how much power those would draw through the rails though. maybe some carbon brushes against the rails directly? thanks for the vid!❤
All good fun Sam, but be careful....above 50v is considered dangerous to health. But most importantly you are using a variac which is a variable auto transformer...and is not isolating. This means one rail could easily be at mains potential and therefore potentially life threatening.
Keep safe 👍
Hey Sam. I am noticing your camerawork is getting really good. You have picked a very good angle for your talking shots. And the lighting is perfect. Just Wow 👏
Keep having fun with your filming techniques 😂
I appreciate the efforts here! I do slot car drag racing and they're fascinatingly fast, hitting 60mph in just under 60 feet.
One way to get a little extra speed from the propeller version is to hold the car in place until the props come up to speed. Take care if you're running at volts!
You did it! Over a thousand miles per hour! Way to go!
🤣🤣 You mad man LOL. Better start building a mini maglev with your amazing engineering skills and see how fast that can go hahah. 2000 mph at least we bet 🤣🤣 We just love your mad experiments 😄
The best thing was that you were able to stay serious most of the time. I was laughing most of the time when watching.
Is it possible to lay the track diagonally across the room? Corner to corner should be a longer distance. Love the dragster.
seeing the insulating fishplates makes me think it would be fun to have the polarity reversed on the other side of them, to both have a jet engine style of braking, and potentially to create a shuttle up-and-back demo layout
Sam can’t get enough speed!! I actually have a massive straight on my layout so I could test it again if you want Sam!!😂
Possibly for the next dragster design, add some fins to provide downforce and weights
Have you tried bullfrog snot to improve the traction? You'll probably have to apply it to the drive wheels and then have an extra axle just for the electrical pickup.
Oh yeah, maybe if you hide a motor and fan in those Walther’s tank cars you reviewed recently (and cut out the tank end caps) you’d have the fastest tank cars in ANY scale! 😄😄
Every modeler should see this as a reminder to occasionally have fun with your trains
Well done! Great video I've been waiting for a vid to come and its come! Keep up with the great content + videos. (You are also the only person i know who likes to risk there life, power bill and his trains for content!)
MEANWHILE on his second channel, Sam'sBubbleWrap... "Today we'll be testing the shock absorbing impact of the Riley 3822, which we all know to be exceptional in pop quality and surface integrity. I have these model trains set up to give it a good workout, so let's see how it stands up to some high-voltage impacts!" 🙂
Sam, believe it or not, several early electric locos in America were built like your dragster, having lots and LOTS of wheels because of the low torque, They ran on the legendary Milwaukee Road.
Great video, Sam. I think on the last attempt, you need to create a downforce that will keep it on the rails.
Many thanks
Harry
Good work Sam. What I would like to see is how fast can you get a loco to run on 12v, and still have a prototype profile.
Great video sam those things were going fast! Wouldn’t want to get hit by one 😆
When Sam pulls out the Variac we are in for some high powered bullocks
Now Sam is in dragsters too .....I love dragsters for the power n acceleration they produce.....n speed too
Looks like you gave away a future review of a locomotive, the box at the bubble rap was an MTH DCC ready locomotive
Congrats Sam!! I swear that thing looked like it shot out of a cannon or something. Absolutely incredible.
You're nuts! 😂 Ya always know how to entertain to the absolute max!
Very well made video Sam! tho i have the feeling your next train is going to be rocket powerd at this point 😂
For the dragster, I'd ditch one of the motors. Drive only the front wheels, and use the back wheels for picking up power, that way you could run traction tyres on the driven wheels. Maybe run 2 rear axles just so it's only half the power through each pick up.
You should try the dragracer on a continuous loop of sloped straight tracks, kind of like those "wall of death" motorbike circles but less inclined
You ought to make a flipbook with steam engine stickers on each square paper page. You need as many square paper sheets (quite small, not tiny) as you want to make the book, a pen or pencil to mark the numbers on each page, a clipboard clip and some funky steam engine and scenery stickers. You can try creating the stickers with a 3D printer. Create the flipbook however you want to, and give it a name: Sam's Trains Flipbook. Or any fitting name you think of. Clamp the pages in order together with the clipboard clip on the left hand side, and flip away. Try it.
That's a very clever idea Kelly - I'll have to try that some time!!
Thanks for watching - Sam :)
Who knows, Hornby may have been onto something, you need traction tires! Haha great video as always Sam!
Strongly suggest not using so many fans, stacking only increases static pressure not velocity
The mad scientist is at again, lol. Love it sam!! Next time use a scale size jet engine for rc planes.
I love your way of thinking
Excellent video Sam I really enjoyed watching this.
Well done Sam! Excellent, fun video.👏😀
Sam you just keep smashing your own record! 🫡😆
You need a bench power supply instead of using a non-isolated variac styel supply. This is extremely dangerous as you are not isolated from the mains power.
The motors actually ran faster when the voltage dropped off when the pickups started arcing more. Also, I think the two motors were not synced with each other, and the fans were fighting each other, with a vortex being formed inside. It would likely run faster with 1 motor and only 2 fans. Stripping the tunnel off kind of lends some credence to the vortex issue
I noticed in your dragster testing it was always derailing at the same point every time, so I feel it may have been the track causing the derailment rather than the wheels. The movement of the track would be more than the wobble of the wheels
bet that dragster could do a lot better with some proper downforce and rubber allowing it to get the power down… but then it’s probably more of a model dragster than a model train
That was Brillant! 🎉 I'd love to see the dragster under normal power pulling rocket coaches up Gordon's hill
You should have it run with ball bearings pressing on the underside of the railhead so it doesn’t fall off. That way, you can test it on curves.
Happy November 1st Sam.
Cheers Jasper & Willow
7:23 jeez look at the sparks on those rails
*30 seconds later*
7:57 "what I need to do next is run 80 volts through this 12v motor"
you are crazy as hell!........ keep it up......great entertainment it has made my day
LOVE IT ! Great video. Fan blades at higher RPM may flex forward allowing more spill-off of "working" air. More blade pitch helpful ?
That was one heck of a workhorse. You definitely have outdone yourself with this one. I’m not too much worried about speed, but would like to know if it’s possible to create a fan driven locomotive that can actually pull a train. Or better yet, one fan driven locomotive at each end of a passenger train or cargo train. That would be interesting to see.
Keep up the wonderful work and thank you for doing these experiments, so we don’t have to. Cheers
Hello, I love your British style, Hans from Germany!
Ah yes the mad scientist Mr. Sam's strains is back!
Yes direct drive - remove all that stands between your wheels and POWEEEER.
Very spectacular, so if there is a next time it will have to be on longer track and probably outside?
Certainly can go faster, lighter materials, less solid frame (hexagons, triangles or what have you) higher rated motors, hobbyists have 12/24 as general use so there should be something in that range no doubt but there could be 42V as well. i imagine overclocking those could be fun. or at least scary.
Maybe you should go and film offsite, find a long hallway somewhere that you can set up a much longer track, and then try the dragster on that. Alternatively, you might get something out of giving the dragster some down force to reduce wheel slip.
I thoroughly enjoy all your videos Sam, but I LOVE the crazy experiment videos. My favorite was the brakes. With your new found engineering talent I bet you could make a new, improved model. It'd make a fun video at minimum. Thank you for your videos!!
And maybe I'm being crazy, but you might even be able to make a little retrofit kit and sell them!
Hi Sam, what about trying a Sparklets/Soda Syphon/Soda Stream type CO2 cartridge?
You'd need some kind of valve to release the gas instantly but you could trigger the release through voltage on the track.
Wonderful video Sam. Are you calculating the speed at OO scale or HO scale?
Awesome video Sam's trains
Thanks Brian!
poor old mr jenga, constantly slammed in to a bubble wrap wall and he so kindly sponsored the raised wooden track bed. lol
You should do an aprils fools advert for the drag racer claiming that it is very safe, reliable and almost impossible to have a crash whilst there are clips of it falling over in the background
Time to start taking these experimental trains outside. A longer run would be better, and soon will be needed. Fun fact, you did break the sound barrier, in scale.
Put the faring on the front to increase the air density, then put a nozzle on the rear to constrict the air flow and increase air pressure against the fan blades. Also, see if there are other ways to decrease weight.
A venturi as used on the Saturn rockets etc. To increase the speed of the exhaust gases.
In the Saturn and other rockets, combustion takes place and the heated exhaust expands against the cone of the nozzle That does not take place here as there is no expansion.@@davidstaves6669
Always enjoy your videos👍
The next generation of Sam's Frankenstein jet trains
I don’t know which is brilliant the first design or the new and improved one, because I think both of them are awesome.
Good video, Sam. Very interesting. Re the dragster running at the higher voltages, I suspect your limiting factor is wheelspin. In this case you change from static friction between tire and rail to sliding friction, which would remain constant regardless of the wheels' rotational velocity. This would likely occur very early in the run since the weight of the vehicle is light, i.e. the normal reaction between wheel and rail would be low. This would possibly explain why you saw no speed improvement as the voltage and current increased. Maybe set up a funicular cog drive system using your fancy printers?🙂😀😁
(Pssst... btw, voltage goes across the motors and current goes through them)
Congratulations love your videos. Very interesting content. Great job. Have a blessed day everyone
I did the same thing with a hairdryer turbine fan/motor combo duct taped and wired to a lighted model passenger train. The model train went so fast it flew off the track.❤
very nice, i clicked on this video because Turbo train looks very similar to Fireball XL5
I reckon that the turbo train might have been running into a problem that actual turbines run into, which is having fan after fan actually decreases efficiency which is why they have a static set of blades between each set,
Granted that's for fans being moved by the air and not fans moving air, but I do think something similar might have been happening on the initial tests,
You need to do a course in aerodynamics. It’s not all about voltage, it’s about the blades and airflow. Just turn up the blade pitch.
Wonderfully bonkers. Could you modify a Triang Hornby Battle Space Turbo Car? Might be worth remembering to wear insulating (vinyl?) gloves. Next step might be a wheeled variation on a Maglev?
Brilliant sam nearly peed myself laughing when the drag racer appeared 😂
totaly bonkers. well done.
That was awesome! Image seeing that as a functional model train for sale! Cheese-it’s Crusts!!!
I have an old Athearn Bluebox mode that when I turn it up to full power runs at like 5 mph
1) take the passenger off of the front. It’s ruining your airflow
2) you ruined the fan efficiency by taking off the top half of the duct. Ducted fans need fully ducted and with a very tight tolerance between the blade tips and the ducting for maximum efficiency.
With that fixed and thicker gauged pickup wire it will go much much faster.
lol that was so funny! 15 MPH! and yes even I could hear the wheels still spinning! 1136 scale MPH!
Hi sam, love to see your inventions pushing the limits of modelling. Do you think an entirely self sufficient track cleaner would be possible? I know this must be the bane of many modellers existence. The dapol one is nice but not really abrasive enough if you ask me. I was just brain storming of building a grinder car with two spinning pads underneath, followed by dapol's car set to 'vacuum' mode followed by a tank car with cleaning cloth underneath, but it struck me that it was the kind of invention I feel you could take on. I don't mean to suggest but I would love to see you tackle it. sorry for the novel!
That Thing Runs So Fast That Gordon Is Jealous.. Lol
That Turbo Engine Might Give The Passengers A Fair Fast, And Smooth Ride If Its Possible
The thing that does not get scaled is the properties of the air. This is always the problem with scale models the natural elements do not scale. So in the real world of model testing, for air reduced pressure and humidity chambers are used, for water it replaced with lower surface tension fluids. etc.. Your dragster would be suffering from imbalance from any imperfections in is wheel structure, mounting or machining. The only way is to make wheels from solid rolled bar. The power pickups need also run on a smooth surface. Any arcing will cause pitting of the surface.
Use neodymium magnet to keep the vehicle on the track, shape the body like an inverted wing, and use a model rocket engine.this necessitates using it outside though...
When increasing speed, you need to think about the aerodynamics as much as anything. The rule of thumb is to double your speed you need to square your power on the same structure - so actually drag reduction (both aerodynamic and rolling) is very important
Decent video here Sam, even though they are not anything like the creation you have made here realistically I would say the fastest trains I have in my collection would probably be my hitatchi 395 javelin or my Eurostar
Thanks David - ahh interesting, yeah bet that's right!
Thanks for watching - Sam :)
I wonder what speeds would be possible with "Estes" model rocket engines! Time to move the trackmoutdoors.
Whatever happened to the Jetex rocket motors used for model planes when I was young?
I think there is a limit on the dragster motors. I dont know the spec rotation per second max as designed, or how much past that you could reasonably go without frying it.
I do wonder though about the wheel slippage. Any goo drag racer would tell you that areo is highly important. Being bith axles are powered....(I wonder if a half rotation difference between the two is also combating for dominance...) I would add a front downforce wing and a rear down force wing. Nothing extravengant. Just a flat panel above the front wheels and one above the cockpit. Just enough surface to provide enough downforce to keep the wheels engaged with the track.
Imho. Lol
This was loads of fun!
An increase in voltage has an exponential increase in power since P = VI = V²R
nice work sam
Gave this a like before I even watched it because I was thinking to myself - when will Sam do another...
I'm not contemplating an HO scale rocket train... not at all.
I love how the Drag Racer looks like Fireflash from Thunderbirds and that plane could go 6 times the speed of SOUND 🤣🤣
I think if you put some traction tires and or add a little bit of weight to the dragster you may get more speed out of it food for thought
Sam needs to open a museum for All of these record breaking models
Hats off for blowing up this record.
The next step to go faster is ... rockets ;)
20:44 is the scary sound for me! last time i heard that a Tornado was busy buzzing past my house when i was a young lad living in Northamptonshire a noise youll never forget once you have experianced a tornado in real life.
I'd say a Lightning climbing vertically on full power might be louder!
I remember the era when propellers was tested on train engines .....may be only two prototypes were made one is in museum and second is with you😅😅