[TowerTalk] flexible mast coupling

[Bob K6UJ]

George,

Thats what I am thinking about doing when I fnd more info.  Steve, K7LXC said it was in Dave Leeson's book 
 "Physical Design of Yagi Antennas"     Leeson used a BMW drive shaft flex coupler, sounds like that is what you are doing.
I have his book around here somewhere, I'm going to look it up.

tnx
Bob
K6UJ



  It was actually Dave Leeson, W6NL, ex-W6QHS, and it  was in his book 
"Physical Design of Yagi Antennas." I recall he used a BWM  coupler part. Of 
course at his hilltop QTH above Los Gatos the winds  occasionally hit 140 MPH!
On Apr 5, 2012, at 11:49 AM, George Dubovsky wrote:

> I have two prop-pitches in service, one turning a conventional tower-top mast and one turning 70 feet of rotating Rohn 45. In both cases, I designed in the giubo from a BMW 1600 drive train.
> 
> 73,
> 
> geo - n4ua
> 
> On Thu, Apr 5, 2012 at 12:27 PM, Bob K6UJ <k6uj at pacbell.net> wrote:
> 
> As I see my stack of beams swinging back and forth in the wind I am thinking about adding a flexible shaft coupling above the rotor
> to absorb the shock,  I have read somewhere about using automotive drive shaft flex couplings and adapt them to clamp on to
> our 2" masts.  I used to have one of Bill Orr, W6SAI books on antennas and if I remember right he used one for a Volvo, and it
> had a rubber donut between two flanges.  Anyone make a flexible coupler for their mast and would share what you used ?
> 
> Bob
> K6UJ
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