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@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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