ORIGINAL: flyX
A .15 or .18 car engine can produce 1HP...but they operate at higher RMPs . Up to 30000+
It is dangerouse to mount a prop to a r/c nitro car engine..becuase props are not designed to spin that fast.
It'll break apart and can posisbly killed.
If you put a prop normally used on .15 aiplane engines, 8x4, 7x6, 7x4, on a .15-.18 car engine, there is absolutely no way on earth that the engine will spin 30,000 rpm. Double the rpm of a prop and it takes four times as much torque and eight times as much power to turn it.
Not understanding the fact that it takes more torque to spin a 10x6 prop 13,500 rpm than it does to turn a 12x6 prop 9,500 rpm gives rise to the common misconception that 4 stoke engines make more torque than two stroke engines.