[TowerTalk] HAM IV rotor / mast slipping

[Dick Dievendorff]

Someone suggested to me that I might increase the mast to clamp friction by
wrapping the mast with something with a little bite.  Do they make
double-sided emery paper that can tolerate being wet?

I have a clamp to mast size mismatch that I'm going to try to correct with
shims, and I might end up pinning too.  My prop pitch doesn't have a wedge
to break.  

I've used pins (usually grade 8 bolts) in the past and they have failed
because they weren't hefty enough. The hole ended up larger than the pinning
bolt and the wind would work it back and forth enough that it eventually
fatigued and failed.  The hole got larger in this process. 

I think I had too much on the mast.  I've changed that in my new
installation.

Dick, K6KR
  

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Frank
Sent: Thursday, April 05, 2012 5:24 AM
To: n8de at thepoint.net
Cc: KA9S - Jeff; towertalk at contesting.com
Subject: Re: [TowerTalk] HAM IV rotor / mast slipping

n8de at thepoint.net wrote:

>The Tailtwister (big brother of the Ham IV) has a pre-drilled hole 
>through the upper rotor housing and clamp piece.
>
>I'd pin the mast with your rotor, just as is done with the T2X.
>
>73
>Don
>N8DE
>  
>

Pinning the mast to the rotator is a sure way of preventing mast slippage.
It also puts you at risk for rotor destruction if the wind load becomes
overly excessive.  Since there is no good way of predicting how strong the
wind is going to be here in Texas,  I have preferred not to pin the mast to
the rotor (anymore).

It is a PIA to have to re-align the directional calibration every so often,
but it is an even bigger PIA to replace the rotor after its gears get
striped.
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