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It takes me a while to set the whole thing up in its running condition which I haven't been able to do again since my first posting but I've rechecked the sections of track where the car is slowing down and the values are almost exactly the same as previously stated except the max resistance...

Thank you I checked the track for resistance and over 12 feet including the slow section I am getting 0.2 ohms resistance. It doesn't seem like much but is that enough to slow the cars down?

Thanks 3DDave, I've been thinking about adding another power supply to the circuit and placing it diagonally opposite as in the pic here. What do you think? https://files.engineering.com/getfile.aspx?folder=bc6511a8-2c9e-463d-9a86-2e003dfdb36d&file=CIRCUIT_2.pdf

This concerns a model electric car circuit in an oblong shape 8 feet by 13.5 feet. The entire circuit is 43 feet long with 4 equally rounded corners. The drawing is not to scale but is approximately right. The power is connected to the circuit at the position shown and the cars run smoothly...

Adhesive shrink wrap tape https://www.amazon.com/Mr-Shrinkwrap-Polyethylene-Synthetic-Adhesive/dp/B0774LTV2C

If I cut the groove shown in the drawing when the 12 foot PVC board is flat, will the groove maintain it's dimensions if I then bend the board into an 8 foot diameter capital C shaped semi...

Thank you Bill West, I get it now and I'm grateful for your explanation. I'm sold on the geared motor. Thanks to the rest of you who tried to educate me too.

The post I'm using for reference is this: https://www.reddit.com/r/askscience/comments/19wuqt/why_do_electric_motors_have_maximum_torque_at_low/ Where the implication is that the design of the motor determines the RPM and the lower the RPM is, the higher the torque is. My question is: By using...

Hi Bill, I see what you are saying and please correct me if I'm wrong but won't the use of a gearbox reduce the torque as well as reduce the RPM? My understanding from what I've read online is that when a motor is designed with a low RPM then the torque is high at the low RPM, but when using a...

I need an 18V 1.5 Ah 27 Wh motor having 200-400 maximimum RPM with no gearing. I can't find one to buy so is it possible to make one? How would I make one?

Thank you all for your help I appreciate it.

Thanks for all your replies and for increasing my understanding, but that's not to say I'm fully OK on the subject yet and I apologise for that. I've found this motor that has the 250 RPM I want but it's only 12 volt so will my present 18 volt battery burn it out or will it just make it run 50%...

Is there an easy way to cut the RPM of a DC electric motor by a substantial amount, let's say to about 10% of the present RPM, without adding any parts? Is there a quick and easy way to do that? How do I cut the RPM by any amount without adding any parts? If there is a way to do that, will...