Hi Guys
i am converting a 33 cc ryobi gas chain saw engine for rc airplane use so i need the power ratings of the engine ,RPM and which propeler does it suits and if any one of you have converted this type of engine thn please send me that link


waiting for your replies
Falcons Cuz

I did one of these a few years' back.

The performance of mine was almost identical to that of my Zenoah 23 ... same prop and same rpm.

I made a record of the figures.

Smart 18 x 6 wooden prop, standard exhaust, large-bore carb ... 6,700 rpm.

I squeezed out 6,900 rpm after modifying the exhaust; but there was a noise penalty, of course and a deterioration to the engine's idling. That's around 1.3 hp, I estimate.

The engine flew my 15lb Stampe reasonably well.

If you have room for a tuned pipe, expect to increase the power output by around 40%.

I just did some testing on my ryobi 33 cc weedwacker engine and with a bigger carb, wackerengines pitts muffler and an electronic ignition it spins a xoar 18x8 to 7250 rpm this is a pretty agressive prop. My motor also has a two ring piston and the cyliders without the decompression slots. No porting has been done. just using the best parts combo.

Chris