[TowerTalk] Rotator Choice for Larger Yagi

Wed May 4 11:03:41 EDT 2016

Yes, actually there are two thrust bearings 1.5m apart from each other on
that tube, which was a former R&S rotator from the military, and then the
inner steel tube ends into a flange which is connected to the main rotating
tubing mast (152mm diameter).

The larger tubing is sitting in Delrin rings enclosed by aluminium rings
where it leaves the lattice tower.

That was a very reliable system, one turn took 40 seconds and maximum wind
speed at that qth was 205km/. I used it for 10 years and I am now preparing
it to go on another tower which will take a stack of 5 Element yagis for 10,
15 and 20 on a 9m long pipe mast.

http://m3.i.pbase.com/v3/91/283791/1/50045863.P0001125.JPG

http://m9.i.pbase.com/v3/91/283791/1/50045859.P0001104.JPG

http://m0.i.pbase.com/v3/91/283791/1/50045860.P0001105.JPG

73
Peter, DJ7WW

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Bob
K6UJ
Sent: Mittwoch, 4. Mai 2016 15:40
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Rotator Choice for Larger Yagi

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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>>>>
>>> _______________________________________________
>>>
>>>
>>>
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>>>
>> Best Regards Stein-Roar "Rag"
>>
>> _______________________________________________
>>
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