ORIGINAL: MinnFlyer
ORIGINAL: AstroDad
I tried a 12X7 and that seemed to be too much. I did not have a tach, but it seemed the revs were down and in a dive you could hear it rev up.
So?
I would expect an engine to speed up in a dive due to the engine not having to work as hard. I also don't like to over-rev engines. A good practical RPM for a 2-stroke is 11,000 - 11,500 RPM
And the OS 55AX manual even recommends a 12x7 to 12x8 or 13x6 to 13-7 prop.
By using an 11x6, you just might burn that thing up. Hell, I use an 11x7 on a 46!
The 11X6 seems to pull it much faster while going level and climbing while the 12X7 only performed well while diving, so the overall performance is much better with 11X6. I have also been using 0% and 10% nitro fuel, so that and my tunining issue might have me down on power a bit.
I think I really need to try and 11X7 and a 12X6, maybe they would do even better than the 11X6 and the 12X7?