[MHml] mast woes

[Bill Gibbs]

I'm sure your points are also correct.  My rod and mast require proportionally more tensioning than a Tornado.  We are not looking
for prebend however, as much as avoiding slack diamonds on the unloaded side.

We jiggled the gauge continually to overcome any sticking friction.  Seemed to help.

Bill
PS - stop helping Mike.  All this Tornado stuff gets in the way of his crewing with me.  :-)



-----Original Message-----
From: multihulls-bounces at steamradio.com [mailto:multihulls-bounces at steamradio.com] On Behalf Of Glenn Brown
Sent: Monday, October 16, 2006 10:07 AM
To: Informed discussion of multihull issues
Subject: Re: [MHml] mast woes

> The riggers got my new rod diamonds installed Friday, mostly.  They had 
> trouble getting the original tensions back.

I just tensioned Mike Dobb's new carbon Tornado mast last week, to the 
tensions recommended by Charlie Ogletree (so I know they were right). 
The mast uses rod rigging.   With a Loos guage attached, the tension 
went up rapidly, then very slowly with turns of the wrench.  I attribute 
the rapid increase to increasing rod tension before prebend was 
introduced, and the subsequent slow rise to bending of the mast.

So, I have to wonder if your riggers are simply not accustomed to 
prebent rotating rigs.  I don't imagine there are many of them in 
Ventura that rely on the pro riggers.  (I imagine the F-boats are a more 
DIY crowd.)

Another factor was the Loos guage has some internal friction, and the 
guage would stick/jump/stick/jump slightly as I tensioned, making it 
look like tension was not increasing at times; so I didn't trust any 
differential reading where I didn't push the guage to reduce the reading 
and let it settle on a new number.

--Glenn
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