That was quick! Yep 4100, trying the Beaver so as not to wreck newer planes. I just can't kill the old Beave and it is always there to fall back on when all else is scrap.

I'm not a big gear head but I am assuming that the ratio ; say 5.3:1 means that the motor turns 5.3 times to every 1 turn of the drive shaft hence gear reduction?

Thanks again,

Joe