Item 1297
DESIGN: Dragonfly ~ Rotor -
Hub - Clearance - Tie-bar / Control / Mast
Also see;
DESIGN: Dragonfly ~ Rotor - Hub - Tie-bar - Thimble - Center Same thing?Drawing:
Notes:
For 10º of flap the lateral movement of the tie- bar is 0.5". Since the flap is ±10º, the total movement will be 1.0"
The control stick has a 0.375" diameter.
For 10º of control stick movement, at the elevation of the tie-bar(s), which is 1.2" below the center of the gimbal, the lateral movement will be
tan(10º) * 1.2" = 0.21"Size of opening in tie-bar assembly:
Flapping:
It appears that if the phase angle was 90º then the tie-rod center circle will move in the same direction (due to flapping) as the control stick (which passes through the tie-rod centers) moves. I.e. the opening in the center of the tie-rods does not have to be too big. Note that an excessive flap, due to a gust, might cause the tie-bar center to move the control stick. Also, note that the directions of motions will not be exactly the same since the phase angle is approximately 65º, not 90º.
Lead-lag:
The lead or the lag will is will require that the 'hole' in the center of the tie-bar assembly, Option C, be bigger than that for flapping alone. Perhaps the center in Option D in
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Last Revised: November 21, 2003