Item 0951

DESIGN: UniCopter ~ Rotor - Hub - ARR - LAYOUT (2)

Overview:

This layout currently has two, possibly independent, features;
    1. A uniball.
    2. A swashplate.

Drawing: The drawing below has been modified.

 

 Notes:

Consider having pitch horn horizontal when collective is in hover. This will;

Have the linkages in their mean position during most of flight time.

The pitch horn/link connection will not have to be so high and therefore there will be more clearance for the other rotor's blade. Ref. Rotor - Disk - Blade to Hub Clearance 0952

Consider eliminating the uniball.

May have to take 'V" angle from 18º to 20º and/ or spread rotors from 27" to 29" to have 2.5" thick blade at r ≈ 27" If the above does not work. Note also that the blades are not 2.5" thick at this radius.

Notes on Swash-ring:

For the cam follower have a Torrington MDW4K2 (page Control bearing/31) press fit into a Torrington Radial Bearing Type 6SF10 (page Roller bearing/110) or next size bigger. Consider whether it would be better to use the Torrington Radial Bearing with or without the outer ring. Can this bearing handle 600 RRPM * 10 * (22/7) / (22/7) = 6,000 RPM? The page for this bearing say "not to be used as track roller, cam follower and the like." This bearing is a 'retainer type' not a 'full type' and there for page Control bearings/4 say that it need not be limited to oscillating loads.

The arm from the blade should go to both sides of this bearing because of the small axle and side loading.

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Last Revised: November 11, 2001