[TowerTalk] Rotator Choice for Larger Yagi

[Bob K6UJ]

Peter,

I see the flex disc mounted above the rotor in the second picture.
Is that a thrust bearing above the flex disc ?

Bob
K6U


On 5/3/16 11:42 PM, Peter Voelpel wrote:
> 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 at contesting.com] On Behalf Of Bob
> K6UJ
> Sent: Mittwoch, 4. Mai 2016 04:46
> To: towertalk at 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 at 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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