Hi, as the title says, im building a custom rc, i will make it happen!! the rc fanatics ive talked to think im crazy. About the Rc; it will run off of a mini 12v motorcycle engine that hooks up to a 12v cordless skillsaw motor. with the right gears and transmission method, I believe that strong motor can push the Rc beyond 80mph. I have quite a few challanges, im hoping someone can help me solve one. Ive been trying to figure this out!! i cant have the motor go from zero to 80mph on those little 6" tires, it would probly just break instantly. is there a way to use a stepdown voltage regulator to basically be 1st gear, making the rc start out slow due to less power to the motor? then my rc will actually take off! and the next step, i need some type of a "switch" (lol) that will; allow the power to switch from the stepdown over to 12v full power basically 2nd gear. another problem is im afraid if I use a regular 12v rc pcb from some store bought model that the amps going to the motor will fry the board? or maybe it wont be enough? how can I be carefull not to fry the board and still get full power to the motor? Im actually very excited to ask these questions to this comunity, you guys are awesome!!

I guess that may be too much to start with. Assuming the pcb can handle the load, how can i impliment a switch that starts on the circuit of the stepdown regulator and then clicks over to full power? im not sure if it would be easier to have this said "switch" be on a timer that switches to full power after a few seconds vs. trying to impliment a switch on the remote that makes the switch to the motor switch.. sorry im a noob!!

 

Have you ever watched cars drag race? They burn rubber moving off on full power.

Who knows what will happen in your situation. Why not try it with a long control cable and see what happens?

As a kid I built a power boat with an over-sized propeller for max speed. Guess what happened when I took it for a test run in the water.

 

did it work? i kind of have a vision of this thing being able to go slow as well to be able to do a little bit of off roading along side an actual truck if possible

oh man, proof reading the original post, i meant to write "powered by a 12v mini motorcycle battery" woops.

 

is there a relay that can be triggered by a rc pcb that will allow the flow of electricity in a separate circuit (from battery to stepdown regulator to motor, 1st gear [this would eliminate any ohm / amp issues involved with the pcb]) that will switch on a timer to another separate circuit (from battery to motor, 2nd gear)? theres got to be a timed relay that will basically turn on the power from battery to motor, separately. and then it can go to the next circuit after x amount of time. That was hard to say! i feel like its almost too much to ask but i think its possible

 

is there a relay that can be triggered by a rc pcb that will allow the flow of electricity in a separate circuit (from battery to stepdown regulator to motor, 1st gear [this would eliminate any ohm / amp issues involved with the pcb]) that will switch on a timer to another separate circuit (from battery to motor, 2nd gear)? theres got to be a timed relay that will basically turn on the power from battery to motor, separately. and then it can go to the next circuit after x amount of time. That was hard to say! i feel like its almost too much to ask but i think its possible

If you don't want to have cumbersome long wires, yes, you can have a relay that is energized for, say, 5 seconds, to apply 12V to the motor.