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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>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>
>> _______________________________________________
>>
>>
>>
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>>
>
> Best Regards Stein-Roar "Rag"
>
> _______________________________________________
>
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