I used such on my home brew rotator.
http://m2.i.pbase.com/u13/df3kv/large/21834952.Kerpen1.jpg
http://m4.i.pbase.com/v3/91/283791/1/50045854.P0001095.JPG
Very powerful rotators are made by Luso, two are in use at DR1D, one at the
top of one tower with OB804020, the other to turn a complete free standing
tower with stacked monobanders:
http://www.lusotower.com/USA/rotator-XR-1500.html
73
Peter, DJ7WW
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Bob
K6UJ
Sent: Mittwoch, 4. Mai 2016 04:46
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Rotator Choice for Larger Yagi
Hi Rag,
Yes that is it. It is commonly listed as a drive shaft flex coupling or
flex coupling.
All cars have them. They are designed to mate with the respective
automobile drives shafts so our challenge is to make two mating flanges
that attach to out our masts to replace the auto drive shaft flanges.
Bob,
K6UJ
On 5/3/16 7:12 PM, Stein-Roar Brobakken Rag LB3RE wrote:
Hello
Maybe you think of drive shaft pad/joints ?
http://www.ebay.com/itm/Drive-Shaft-Coupler-fits-2005-2011-Dodge-Charger-Mag
num-Challenger-DORM-/231589278784?hash=item35ebcbf440:g:a4kAAOSw9N1VqAfp&vxp
=mtr
http://www.ebay.com/itm/NEW-Flexible-drive-shaft-joint-for-VAUXHALL-Opel-Fro
ntera-/231932309467?hash=item36003e2fdb:g:zM8AAOxyBvZTQYN-&vxp=mtr
This can be place above the rotor and have steel plate seperatly..
This ones will absorbe energy/twisting
73s LB3RE Rag
Den ons, mai 4, 2016, 04:05 skrev Jerry Gardner:
Interesting, Not being a "car guy" I've never heard of flex discs. Do you
have any more info, perhaps a few links to websites describing them and
how
they can be used as part of an antenna/rotator system?
73,
Jerry
On Tue, May 3, 2016 at 6:48 PM, Bob K6UJ <k6uj@pacbell.net> wrote:
Someone here on Tower Talk in the past mentioned adapting an automotive
drive shaft
flex disc in the mast right above the rotor. Said he had zero rotor
issues after installing.
As you probably already know the flex disc coupling consists of two
mating
flanges attached to a shaft with the flex disc sandwiched in between.
The
flex disc is a synthetic rubber compound. The automotive flex discs
are
designed to absorb the torsional shock from hard acceleration and
deceleration. They are well suited to our application and will handle
our
torque loads easily. I will be installing my new OR2800 this summer and
plan to
install an automotive flex disc coupling above the rotor. Not that
difficult to do and I would rather replace the rubber disc periodically
when it shows signs of deterioration rather than repair/replace the
rotor.
Much cheaper
too :-)
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Best Regards Stein-Roar "Rag"
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