RE: Used K&B .20 Sportster
Great news. I had a little time ot waste so I adapted a nice OS 40 size muffler to the K&B .20 because of a bad thread in the stocker. No Baffle because the guy that sold it to me was a Dork (sorry venting )! And I tested some props on Sig 15% nitro 20% castor. With an OS #8 plug. All props are Master Airscrew.Here are the results. With the 9X4 from my first test I got 14,500. with a 10X5 I got 12,300 and with a 10X6 I got 10,700. If you run the numbers across a thrust calculator you will see the 10X5 is making 58 mph and 4.32 lbs of thrust. Nary a hint of detonation and it throttled up beautifully on the bigger props. Not too bad for a .20.