1227

Item 1227

DESIGN: Dragonfly ~ Control - Flight - Assembly - Layout (w/ Pitchboss)

Drawing:
The drawing is wrong. The offset is 13.5". See 0986.dc for true drawing

Look into the possibility of decreasing the V-angle and/or the Stagger even more.

But what about yaw??

August 24, 2003 ~ The stagger has been changed to 24". The following must be checked and revised.

Control Stick Motion:

If there is not sufficient room for the stick to teeter at the base of the mast. Some solutions;

The vertical distance between the rotor and the 2nd transmission can be reduced, obtaining 0.26" in radius.
The base of the mast can be mitered, obtaining 0.33" in radius
The next larger crossed cylindrical roller bearing (item 1189) to (item 1156) can be used, obtaining 0.32" in radius

Notes:

Phase Lag:

The controls, as currently shown on the drawing, are located for a phase lag of 90º. The teetering hinge offset will result in this angle being less.

Interaction in Hub - between Control Rods and Tie-Rods:

The movement of the torque tube, for 10 of flap is 0.22".

The movement of the tie-bar, for 10 of flap is 0.50".

It must be noted that

These two components basically move in sync with each other.
In addition to flap, lead/lag will also effect the position of the tie-bar.

Therefore clearance is ........?? Will the base of the rod end clear the tie-rod?

At the present time, see drawing 1181 for dimensions and development.

Individual Blade Pitch Adjustment:

Adjustment of the collective pitch link adjusts the individual blade pitch.

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Last Revised: August 24, 2003