running man- onroad brushless
 

I am considering a 1/10 onroad or 1/8 onroad / rally car. Lets say YOU wanted to build up an onroad that could take a slight beating form time to time, was powered by lipo's and a brushless (of course), and could do 90 on a very smooth very flat road with some degree of 'control'. Obviously you dont have much control, but with a good onroad set up, you could get it to run a large oval track at least... so?? how would you do it?

I am thinking about this as a future project when money allows and when my pede has disintegrated. It would not be a 'basher', just a sweet ride that flew. Has anyone here dabbled with this type of set up?

maybe this belongs in general discussion, but the focus is on the motor, the powerplant.

Thanks!

I think the power plant would be the easy bit.

You'd just need low enough weight and drag and high enough gearing to hit 90mph in a reasonable distance.

The problem will be aerodynamic stability.I'd certainly use 1/8th nitro on road and convert it to brushless.The reason they are stable at these speeds is they have sports prototype style bodies and therefore the stability and low enough drag to reach high speeds.

If you want it to look like a rally car it'll have to end up looking like more of a hillclimb car rather than a WRC (Think Pikes peak,the air is thin up there so the wings are huge).The aerodynamics will be a challenge unless you stick to 1/8th on road bodies.Remember drag increases as the square of speed and so does lift.

makes sense
 

that makes plenty of sense. I was thinking more WRC, but you have me on the right track.

Well, if you go lipo, how many 'cells' and what motor?

Obviously the gearing would play a huge role-

I wonder what effect a hoodscoop directing airflow to a brushless esc would have on the ballistic coefficient of an already fairly aerodynamic body at high speeds?

Has anyone ever used scoops as an alternative to fans? What was the result?

The more cells the more power you have. The more cells the more weight. With lipo though it is not as much weight.

In reference to a scoop type of thing, it could be a good idea, if done properly. Once you get the air inside of the body, there will need to be a place for it to exit. Otherwise, air will build up inside, causing more drag. And, if done right, the benefits from the extra cooling would more than overcome the extra drag. This is because the cooler a FET is, the lower its resistance. The lower the resistance, the higher the output. It all works out well :).