Ok, I have some numbers to report with the two different exhaust cones. Thrust was tested with the engine in the plane so there will be some loss due to tire friction etc. Outside air temp was about 55 degrees

Two piece tail cone produced 9 lb 0 oz at 160k and 635 EGT

Single piece cone produced 10 lb 6 oz at 160k and 650 EGT

Todd, you stated: "Remove 1.5mm from the lenght of the outer cone.... This opens the diameter of the cone up a tad and, from what I am told, make a world of difference on the output for this engine!?"

Is this when using the shorter two piece or longer single piece cone? I may give this a shot but seems the single piece is the one I want to keep using.


Thanks,
Mike