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I was just gentle winding it up. I went as far as I dared 😁 If I was going to try it over a longer distance, then I think it would need to be a bit stronger, but in the bath it was good enough. I squeezed the video into portrait mode, so you can't tell how far it goes, but the length of the bath is well below it's capabilities.

That depends on how you define "working". It flies a bit, but it is not likely to disappear into the distance miles away. Not every configuration works, some work better than others. It is intended to help you learn about trimming the settings and trying different layouts to see what works best. If you don't try, you will never know.

Hi, Lynn. Yes, larger stiffer rubber bands would give it a faster burst of power. However, soft hobby grade rubber as used in model aeroplanes would allow more turns so it would run for longer. A more aerodynamic propeller would help, too. The difference in wheels is demonstrated in the video. The toy car wheels certainly reduced the distance travelled👍

Thanks, inspired by the kits I could see on eBay. With proper rubber it would probably go further. Those cheap rubber bands are "cheap" 🤣🤣

I did try a different propeller that I had laying around, but it didn't improve the performance so I didn't include it in the video 👍👍

I was disappointed, I thought it would go better.

Just soft plastic 👍👍

I thought I would do a few simple basic cars with no 3D printed parts and no special tools.

I usually just save the batteries from vapes, but when I noticed these I instantly thought of car tyres

Thanks 😊😊

When I saw these parts in the vapes I wanted to do something useful with them.

I usually just save the batteries, but when I noticed these I instantly thought of car tyres 😁😁

@JustFun-iz9rf Yes, I use Tinkercad for all my 3d designs. It is free to use. In effect, you create things by putting together basic building blocks.

That would be something you would find out when you try it. It would depend very much on what weight you use for the swinging ball. The mass gives you the inertia. The other 3 balls are more or less just for visual effect.

@@Putarubberbandonit Thanks

@@LarryReedVT it made me smile 😁

@@horrido666 This is not my design. I just downloaded it from Thingiverse 👍

@spencer963 once it started to loosen up, it was running fine. Silicone spray worked well as a lubricant 👍

I was pleased I managed to get it running. I was beginning to think it wasn't going to work.

@@RaakeshV it was cheating, taking Cds with me on holiday. I have used beer mats/coasters for wheels in the past 🙂

@@Putarubberbandonit Beer mats for wheels? That's some next-level engineering! I'm guessing the car runs on lager fuel too? 🍺🚗

@@ErnieCG thanks, Ernie 😊

@MaxImagination Thanks, Max. It's a re-edit of one of my old videos from 2013 😊

Second attempt 😁😁👍👍

1. Does the car run straight when you just push it without the rubber power? If it doesn't run straight without power, then your axles are out of alignment. That could the axles are not parallel or they may be twisted, so one wheel is not on the ground, so it runs on 3 wheels. 2. When you wind up the motor, the tension may be distorting the body, causing the axles to go out of alignment, with the same effect as "1" above. 3. If you wind the rubber unevenly across the axle, the tension can pull the axle out of alignment. 4. Lack of grip. If the wheels spin, instead of moving forward, that can cause the car to turn. Add tyres to the wheels or add some weight to improve the grip. 5. Both wheels on the same axle must be the same diameter.

This video may be useful ruclips.net/video/cw6MrBy7nCo/видео.htmlsi=vh3Y6gITMWPSMgMj

If you have ever built a rubber powered car using CDs for wheels you will know that it is easy to overpower them and get wheelspin. The simple fix is to cut strips from balloons or rubber gloves to put tyres on the CDs improving their grip. I happen to have a 3D printer and a reel of TPU which is a soft rubber like filament, so I thought I would print the tyres instead. As for RC cars I have made them with CDs for wheels, but only "because I can" rather than any specific purpose. The RC car I printed the tyres for is in this playlist - RC car Mondo Motors 1:10 RC PORSCHE 918 ruclips.net/p/PLA5a2xPRSrB058Ig-TR8csXGgGmnL5soH You will find other related links in the video description, including "putting tyres on CDs" and "RC rubber powered cars" 👍👍

I guess that you are destined to stay confused until you try it for yourself 🤔 Don't forget to post a video when you do it 👍

@@Putarubberbandonit Huh... I just checked your channel with the amount of videos. I'll take your word for it. I assume there would be no grip or the cd would shatter or too much vibration

I guess little sharp grooves would only work on a slightly malleable surface

@GilesCuckow I am not trying to compare my cars to a Formula 1 race car, but do you notice any spikes on their tyres?? There is a reason 😁👍However, you have hit on an interesting mathematical conundrum when calculating friction. The surface area does not affect the friction 🤔 so why do race cars have fat tyres?

Yeah... I really didn't think about that, a formula one car with treaded tyres would shake itself to death, I suppose you are making miniature scale models of a race design. I had a dream of this last night strangely if a tank track design which could capture the original burst of energy into weight on the tracks which could give longer momentum at a lower speed, but that's not your aim I'm assuming. Is your main goal to get the most amount of speed and power for a short duration in the most efficient way?

I am sure it would go further, I only tested it with two rubber bands and there were 4 on there from whoever did the original build, however I found it too awkward to get my fingers in there to attach the bands. Obviously designed for smaller hands 😁😁

It is quicker and cheaper to use a strip cut from a rubber glove or a balloon, but obviously I have a 3D printer and a spool of TPU so I had to give it a try 😁😁 Mk 2 is a little thicker so it grips the CD better. I expect it will probably lose it's elasticity over time.

@Putarubberbandonit that's an interesting point. I don't think I've ever seen anyone test the elasticity of TPU over time. I just printed stuff with it, and they sit on a shelf. Lol

I obviously had too much time on my hands 🤣 Mk 2 is a bit fatter and holds the edge of the CD better 👍

If your printer settings are right, you shouldn't have any problems.

I am sure I could put more turns on the motor, but we were on holiday and there would be no chance of replacing the rubber if it snapped. If the weather settle down again, I will give it another go, maybe lubricate the motor first so I can push it a bit further.

@@Putarubberbandonit Enjoy your all's vacation!

Yes, it doesn't have enough power.

I think this one is simply too short for a decent length of rubber motor. I have built other similar kits but they were significantly longer and worked relatively well. Here are a couple:- ROG Rubber Band Powered Helicopter ruclips.net/video/yrcl3WkwpbI/видео.html Rubber Power Helicopters ruclips.net/video/yFfhMiJ2AZE/видео.html

Yes, this one is simply too short for a decent length of rubber motor. The card body is intended to oppose the torque. I have built other similar kits but they were significantly longer and worked relatively well. Here are a couple:- ROG Rubber Band Powered Helicopter ruclips.net/video/yrcl3WkwpbI/видео.html Rubber Power Helicopters ruclips.net/video/yFfhMiJ2AZE/видео.html

Thanks, Marc. It's just a very simple basic design 👍