Hi,
Menz 21x10 "S" @ 7100 rpm.

+75 degrees F.....nice day.
Amsoil series 2000 2-cycle mixed as recommended at 50-1.
Unlimited on my 17 lb Sukhoi and some speed too!
Bisson pitts muffler with the pinched ends cut off.
I think I gained about 100 rpm from this mod.
The high speed needle is tweaked to max rpm and the low speed needle is as lean as I can go and still maintain a decent transition.
I do not like running rich......it fouls plugs, makes low power, makes carbon deposits, and can cause rings to stick/seize.
Thanks
John


Hello,
More 3.2 numbers
Same equipment and gas.
This time at an OAT of 35 degrees F giving me a density altitude of 1000 ASL.
Beautiful December day!
My previous numbers were at an OAT of 75 degrees F giving me a density altitude of 4000 ASL.
Interesting how the power went up in the colder denser air and could not compensate for the extra power needed to move the prop through the denser air.

Menz S 21x10 6800 rpm
Menz S 22x10 6600
Menz U 22x10 7200
Menz U 23x10 6200
Bambula 22x8 6400
Bambula 22x10 5700
Bambula 20x10 7300
Thanks,
John


Hello,
More 3.2 numbers
Same equipment and gas.
I removed the 5/8" exhaust pipes and soldered 1" pipes to the Bisson muffler.
A little more noise...doesn't matter where we fly.
200 rpm boost in power!
I use Amsoil Series 2000 2-cycle racing oil mixed as directed at 50-1.
This time at an OAT of 32 degrees F giving me a density altitude of 1500 ASL.
Beautiful February day!
Measured with a TNC tach.

Menz 22x10 "S" 6800 RPM

24 lbs thrust as measured with my spring scale known to be accurate in rough water weighing freshly caught fish!

This is in my Sig Sukhoi that weighs 17 lbs.
Nice performance!
Thanks
John


Hi,
May 2004.
72 degree F day.
Menz 22x10 "S" @ 6800 rpm....I get 7000 rpm when the engine isn't fully warmed up.
I think I'm in the fat part of the torque curve!
Nice engine.
John