raptor 60 four stroke

[slammed2000]

has anyone ever put a four stroke in a raptor 60? i have a 90 four stroke that is the best running glow motor i have ever owned. i had it on a 3d plane
and it had awesome throttle responce. anyways i was thinking about installing it in a raptor 60. can anyone give me any pros and cons or gearing possbilities. anyhelp or suggestions would be great.

thanks
aaron

[capebob]

Almost impossible. You would have to have custom gears made, something about 6 to 1. The highest gearing available for your heli about 7.1 to 1 so assuming the max rpm for you motor is 12000 rpm and that's pushing it you will be limited to less than 1700 head speed. In addition overheating has been a major issue on every 4 stroke heli I've ever seen. All this plus a lower power to weight ratio is the reason there aren't many four stroke helis at you local flying field.

Bob

[slammed2000]

thanks bob that was the info i was looking for.