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Re: [TowerTalk] flexible mast coupling

To: <TowerTalk@contesting.com>
Subject: Re: [TowerTalk] flexible mast coupling
From: "Eugene Jensen" <eugenejensen@nyc.rr.com>
Date: Thu, 5 Apr 2012 17:49:36 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I have a OptiBeam OB2-80+ on a 100 foot tower using a motor coupling on a M2
2800 rotor. It uses a drive shaft system. Been in service a year and works
like a champ. The coupling is what you would hookup a 100 HP electric motors
to a pump. The center is a flexible hard rubber. If interested I could set
up some pictures. 73 Gene K2QWD enjoying retirement.    

-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Bob K6UJ
Sent: Thursday, April 05, 2012 4:23 PM
To: Towertalk
Subject: Re: [TowerTalk] flexible mast coupling

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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