Originally Posted by
jwm2
There is 2 stroke gas in 1/5th scale. The problem with 4 stroke is you need a way to introduce oil into the engine using external means. With 2 stroke the oil is mixed in the fuel, which is basically what we run now with nitro. To go 4 stroke you'd need an oil pump and someplace to store the oil until its used, and that means alot of extra weight. I don't think 4 stroke will be that mirco sized anytime soon, but i could see other alternatives to nitro fuels in the future. Stuff like bio deisel might be adaptable and produce good hp and low end torque.
I work in the lawncare industry and over the last few years there has been a trend in what they call 4mix engines being used in handheld equipment (blowers whips). While you still need to mix oil in your fuel they are pretty much a 4 stroke design with a 4 stroke power curve, so it is possible to have one without a oil pump and related items. From what i've read and heard they are still working the bugs out of them. Regarding rc I don't see it being feasible and cost effective. I have been wrong before though.