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Old 11-19-2010, 02:29 AM
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3136
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Default RE: World models 80 inch p51 engine advice

Thank you to both of you for the replies. I've been wondering how this engine would fit in this plane. Seems like its as good a match for this plane (including weight - doesn't take much to balance the plane) as I thought it would be. My 2300 takes about the same amount of weight to balance as the 120g (4.2 ounces) benjret used.

3136 -I would be very interested in the rpm you get with the props you use with that canister muffler. Seems like a good solution to dealing with the noise limts there. About the same cost as a wrap around muffler. Does the canister act like a tuned pipe? How did you pick that size canister?

Thank you

Ed

Hi Ed, I fitted the 18x 8 Hawk prop and I got 8900 rpm. That seems quite high, but the canisters are meant to improve performance.
I tied it to the table on the deck and it was dragging the table, so there is a fair amount of thrust.
That was using 93 unleaded and 30 to 1 castrol 2t oil.
I'm new to gas/petrol engines, would 98 octane give more peformance?

Mark