1326

Item 1326

DESIGN: SynchroLite ~ Rotor - Hub - 3-blade - CVJ & HS - Bearing - Elastomeric - Pitch - Angular

Sketch:

This bearing will probably be like the angular contact bearing below

Sketch is borrowed 0798_ 4.gif

Note:

XXX

Design Loading:

See: DESIGN: SynchroLite ~ Rotor - Hub - Bearings - Pitch

The following was done for 2-blade rotors and must be revised.
Force:

The centrifugal force, based on an over-speed of 25%, is 5,570 lbs

The design maximum flapping force, based on no coning angle, rigid blades, hover loading and an over-thrust factor of minus 25% is 2,553 lbs.

Each of the 2 bearings is subjected to the full flapping force. The centrifugal force is all on this bearing.

Size:

From information on the Rotorway's elastomeric thrust bearing;

It appears that the area of the bearing is 2.115" OD & 0.75" ID = 3.5146 sq-in - 0.4420 sq-in = 3.0726 sq-in. and this is required to handle the centrifugal load.

It appears that the thickness through the shims and elastomers is approximately 1.25" thick [2 stacks of 20 shims etc.]; and this is required to handle the range of pitch rotation.

Shim - Fiber Layup:

xx.

Elastomer:

xx.

Ideas:

Safety Idea:

Consider including a small bronze bushing in the bearing assembly. This bushing may do two things. One, any wear on it, noted during regular inspections, will indicate wear or undersizing of the elastomeric bearing. Two, should the elastomeric bearing fail, the bushing could serve as a backup until the craft landed.

An additional though is that of having an electrical warning, which is created by electrical current flowing from the bushing to the housing surface that it should not be coming in contact with.

Shim:

All the shims are identical.

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Last Revised: October 25, 2004