Nord-Lock Washers with Wooden Prop

[Marc Zeitlin]

While I agree that safety wire will not maintain compression on the bolts, it WILL prevent them from departing the aircraft.

Nope - didn't on my plane. See:

http://cozybuilders.org/Oshkosh_Pres...ert_Center.pdf

The safety wire will prevent the bolts from turning, but that's not worth diddly squat if the hub shrinks away from the crush plate and the hub loses compression. Prop starts moving back and forth on the drive flange, the bolts fatigue, and bam - gone.