OS 40FP

APC 12.25x3.75 @ 10400 peaked.

APC 10x6 12000 peaked.

Byron's 10% fuel. 30°F or so barometer 30.12".

This engine may be slightly modified. I received it 3rd hand and runs better than any other FP I have run. It is an old iron sleeve engine. I just ran it on the stand to see if it was strong enough to go on my Modeltech Magic Extra 300l and then found this thread...I guess I am going to give it a try. The K&B 61 Twister I was going to use won't fit in the Magic Extra fuselage.