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Locking Prop Fasteners

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memde

Member
Joined
May 2, 2020
Messages
16
We’re looking for some advice on a pusher prop installation, specifically how to prevent the nuts from coming loose.

As can be seen in the photos we have installed a ground adjustable E-Prop (NG-D 3-blade pusher) onto our electric motor. The install manual from E-Props does not mention anything about safety wire, just the required tightening torque and not to use loctite. All the installations we've seen (mostly on paramotors) show the prop bolts installed in the aft-to-fwd direction. Our installation requires that the prop bolts be installed in the opposite direction where the nuts are exposed instead of the bolt heads, which I think precludes us from using safety wire.

Does anyone have any recommendations as to a nut locking strategy in this application? Nylocks perhaps? Maybe through the resulting compression of the carbon hub, the tension on the bolts/nuts is such that our existing solution is ok? Something that's not too difficult to install and remove would be nice as we anticipate having to change the pitch often during flight tests to optimize performance. Thoughts?

Thanks.
E-Hawk Team
ehawk.iolani.org
 

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