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Shear Pins for Propellors?
Back when I was growing up on the farm, we used several powered
implements that received their power from the tractor through a power take-off assembly. Somewhere on the device's power train, between the PTO take-off and the "business end" of the apparatus, there was always either a belt-drive or a coupling fitted with a "shear" pin. Both of these systems were intended to protect that tractor (and the implement) by failing if the implement bit off more than it could handle. This morning, while driving past the airport on my way to work, the thought occured to me that a shear pin could be used to protect airplane engines (at least partially) from prop strikes. My understanding is that the props on light singles (at least) are connected directly to the engine's drive shaft. Recognizing that this issue is driven as much by regulation as by anything, I'm wondering if there would be any benefit to using shear pins in these systems. Would it reduce the need for a complete (or partial) tear-down after a prop strike? Would there be any benefit for more complex propeller arrangements? Any thoughts? Rich Lemert |
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