Optimized composite flexbeam for helicopter rotors

Details Optimized composite flexbeam for helicopter rotors Optimized composite flexbeam for helicopter rotors

1996-07-18

1998-04-14

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Nonmetallic resilient mounting

B64C 2738

Patent

active

057384940

ABSTRACT:
An optimized composite flexbeam (10) having a plurality of adjoining regions including a hub attachment region (HAR), a blade attachment region (BAR), a pitch region (PR), an outboard transition region (OTR) disposed between and adjoining the pitch region and blade attachment regions (PR, BAR), and an inboard transition region (ITR) disposed between and adjoining the pitch and hub attachment regions (PR, HAR). The inboard transition region (ITR) includes a first transition subregion (ITR-1) and a second transition subregion (ITR-2) wherein the second transition subregion (ITR-2) defines a width conic and a critical width transition subregion (CR.sub.wt). Furthermore, the first and second inboard transition regions (ITR-1, ITR-2) are composed of a combination of unidirectional and off-axis composite materials (U, O) wherein the off-axis composite material (O) defines a percentage %O of off-axis composite material (O) and wherein the percentage %O in the critical transition subregion (CR.sub.wt) is defined by an optimized curve (70).

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