I would have pointed it down --it would have just got out of the prop wash with plenty of clearance from the ground. I think it would do a good job keeping the plane clean.



SPECS: Length: 177mm overall
Length: 165mm from center of mounting holes to end of muffler --6.5 inches
Diameter: 25.3mm at widest point
Diameter: 12mm at narrowest point
Distance between mounting holes: 35mm center to center
Height of exhaust opening: 6.65mm
Width of exhaust opening: 27.1mm

25FX is 30.5mm from mount holes to c/l of shaft or 1.2inches

6.5-1.2=5.3" With a 10" prop this would put you just outside of the theoretical wash.