[TowerTalk] Recommendation for mast on bottom mount

[AD5VJ Bob]

 Its working thanks fellas :0)

  73 fer nw,
Bob AD5VJ(AAR6VM)
http://www.ad5vj.com/

Member: CTDXCC, NTCC
FISTS: # 12637
10X# 37210, FP#-1141
SMIRK#-5177, RARS #-149


> -----Original Message-----
> From: towertalk-bounces at contesting.com 
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Jan Erik Holm
> Sent: Monday, September 18, 2006 2:38 AM
> Cc: towertalk at contesting.com
> Subject: Re: [TowerTalk] Recommendation for mast on bottom mount
> 
> However can also been done a lot simpler forexample with a 
> "Hardy disc".
> 
> /SM2EKM
> ---------
> 
> Jim Jarvis wrote:
> > W3GM used bottom mount rotors on all of his 100' 25g towers.
> > 
> > The actual mast and the 'torque tube' were of different material.
> > 
> > He used thin-wall irrigation tubing, 100' of which weighed maybe 20 
> > lbs.  No idea what % of that was carried by the rotor, and what % 
> > might have been hanging from the thrust bearing.  The load 
> was light, 
> > in any case.
> > 
> > The effect of this was to allow the arrays.. 3 el fullsized 40, for 
> > example...
> > to rotate in the wind somewhat, taking peak loads off the rotor. I 
> > think he turned the 40m array either with a tailtwister or 
> a ham-4.  
> > In the time I operated from there, maybe 4 seasons, I never 
> remember a 
> > major rotor problem.
> > 
> > n2ea
> > 
> 
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