Jean Claude
Junior Member
- Joined
- Jan 2, 2009
- Messages
- 2,589
- Location
- Centre FRANCE
- Aircraft
- I piloted gliders C800, Bijave, C 310, airplanes Piper J3 , PA 28, Jodel D117, DR 220, Cessna 150, C
- Total Flight Time
- About 500 h (FW + ultra light)
With blades pitch setting 3 degrees, the A.o.A disk is about 9 degrees (*), airframe horizontal, neutral stick, when the forward speed is 110 Km/h.
Now , with blades pitch setting 0 degree, the A.o.A disk should be about 14 degrees (*). Since the airframe balance requires always the GC on the perpendicular line to the disk center, then the airframe now will be +5 degrees nose up at 110 km/h, neutral stick.
To have the horizontale airframe, it requires put the GC more in front (i.e airframe to -14 degrees instead -9° during the hang test)
(*) A.o.A disk = ATAN (Drag /Lift)
Now , with blades pitch setting 0 degree, the A.o.A disk should be about 14 degrees (*). Since the airframe balance requires always the GC on the perpendicular line to the disk center, then the airframe now will be +5 degrees nose up at 110 km/h, neutral stick.
To have the horizontale airframe, it requires put the GC more in front (i.e airframe to -14 degrees instead -9° during the hang test)
(*) A.o.A disk = ATAN (Drag /Lift)