[TowerTalk] Add on 3" mast brake?

[SSC - Mitch - VE6OH - CIW308]

Grant,

Mitch here from Alfa Radio

Don VE6JY did a lot of experimenting with shock absorbsers when he had 
has big 80 meter beam.

You could something like that.

I have made one from a torque disk (replaces a universal joint) on many 
import autos.

I used one for a Mercedes Benz - They are good for many hundred of 
horsepower and they are exposed to the ground so goods for all weather.


That and the Big Rak rotator my solve your problem.


Mitch  VE6OH




On 2022 Nov 16 08:37, Grant Saviers wrote:
> Searched for the BMW driveshaft damper part - $1200 from BMW with a 
> $500 discount, $31 on ebay.  Could there be a quality difference  ;) ??
>
> Also, could make one from multiple threaded end (plate/plate) 
> vibration isolators, but that would cost more.
>
> https://www.mcmaster.com/64885K33 or Kipp from MSC
>
> https://www.kippusa.com/xs_db/DOKUMENT_DB/www/KIPP/BEDIENTEILE/Technische_Hinweise/enUS/TH_009_Gummipuffer_enUS.pdf 
>
>
> Grant KZ1W
>
>
> On 11/16/2022 06:10, jim.thom jim.thom at telus.net wrote:
>> M2, at one time, did offer the BMW rubber coupling isolation assy, for
>> their OR-2800  rotors. The rubber coupler was sandwiched between 2 x new
>> plates.  The 2 x new plates were bolted  between the oem drive 
>> plate...and
>> the oem mast clamp assy.
>>
>> When I went to buy it, I was told it had been discontinued. Reason given
>> was hams  were....'not doing proper maintenance' on the completed 
>> assy. The
>> various new bolts were loosening up everywhere.
>>
>> Permatex now makes... 'orange'  threadlocker. It's as strong as ..'red'
>> but easy to get off like ...'blue'.  IE: No heat required.  That would
>> probably have done the trick.
>>
>> Shorting the windings on a DC motor is a simple idea, superb. On my 
>> small
>> (K7NV + RT-21) prop pitch, it has 2 x windings, so both windings 
>> would have
>> to be shorted, non issue, moot point.
>>
>> Yaesu at one time offered an..'anti vibration pad' that was installed
>> between the base of their rotor..and the  rotor plate. IMO, it won't do
>> much of anything.
>>
>> Still another method that was used back in the 60's and 70's was 2 x 
>> masts,
>> one inside the other, with a good overlap...like 1'.  A coil spring, 
>> like
>> used on the front end of a car's suspension, was slid over the 
>> overlapping
>> mast tubes.  Top of the spring was welded to the upper mast...and the 
>> lower
>> end of the same spring was welded to the lower mast.  There is just 
>> enough
>> compliance between the 2 x mast sections, that the spring absorbs the
>> vibrations.  It worked on the same idea as the BMW rubber coupling.
>>
>> The drawback of course is the 2 x tubes are not bolted together, and the
>> top mast tube must be able to freely rotate inside the lower mast 
>> tube. The
>> overlapped portion was lubricated.  Welding required.    The assy was
>> installed between the rotor plate and the top plate. The main mast tube,
>> (the long, main  3rd tube), was slid through the top plate..and 
>> coupled to
>> the   2nd tube.  It worked, but I only knew of a few instances where 
>> it was
>> used.   The BMW rubber coupling version would be easier to implement,
>> install, and / or replace if required.
>>
>> Jim  VE7RF
>> _______________________________________________
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>>
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