[TowerTalk] Fw: FW: Difference in TailTwister and Ham 4

[Jim Thomson]

From: Jim Thomson 
Sent: Thursday, October 23, 2014 12:37 AM
To: Ray Benny 
Subject: Re: [TowerTalk] FW: Difference in TailTwister and Ham 4

my small pp is 1250 ft lbs...apples and oranges.     The best I can do with the yagi’s is TQ balance the yagi itself..with a small tq comp plate at the REF end.      Then it requires almost no tq to turn in a wind.
Without the tq plate, the  boom will windmill and trash small rotors.     The 2nd way to tq balance a yagi is to mount  boom to mast right in the center of the boom, then add a counterweight inside  the boom    at the DIR end.  light end.   My buddy  would trash his Tail twister.    designed the tq comp plate   using K7NV  software.    Now u can literally turn it by hand in a high wind.   Once tq balanced, it will not move, with brake released in a high wind...... will not windmill.      U would think by now that ant makers woulda figured this one out..... vs  huge rotors.   One of my 2  M2  OR-2800   has stripped out final gears..trashed.  I bought the 2nd one used..and the owner had huge array on it.. and was not tq balanced. 

Jim   VE7RF

From: Ray Benny 
Sent: Wednesday, October 22, 2014 6:40 PM
To: Jim Thomson 
Cc: TowerTalk 
Subject: Re: [TowerTalk] FW: Difference in TailTwister and Ham 4

Jim, 

Good analysis. That comes out to 67 ft/lbs for the H4 and 83 ft/lbs for the TT. 

I can understand that if there is a good wind on a long boom, multi-element antenna, both would struggle to get started.

Thanks,

Ray,
N6VR

On Wed, Oct 22, 2014 at 6:07 PM, Jim Thomson <jim.thom at telus.net> wrote:

  Date: Tue, 21 Oct 2014 14:10:38 -0400
  From: K7LXC--- via TowerTalk <towertalk at contesting.com>
  To: towertalk at contesting.com, maflukey at gmail.com
  Subject: Re: [TowerTalk] FW: Difference in TailTwister and Ham 4
  torque values

  >>>  My question, and I have searched, what is the  difference in
  starting/running torque between the Ham 4 and  TailTwister?

  >  There is no difference in torque output between the Ham IV  and the Tail
  Twister.

      Wrong. On page 154 in my UP THE TOWER book,  the comparison table of
  rotators has the Ham IV with 800 inch/pounds of rotating  torque while the T2X
  has 1000 inch/pounds - a slight improvement. These are  manufacturer's
  specs.

  >  Both use the same drive motor and running gear ratios.  The  Tail
  Twister has a stronger rotor housing, improved mounting  fastener
  arrangement, and a stronger brake wedge setup.

      In some instances, they use the same parts.

  Cheers,
  Steve    K7LXC
  TOWER TECH
  and
  _www.championradio.com_ (http://www.championradio.com)
  Cell: 206-890-4188

  ##  To really do it right,  take the inch lbs value.... and divide by 12.... to get ft lbs.   Then compare
  that to your typ tq wrench..and u will see that both the ham-4 and tail twister really don’t have a lot of tq.
  Start up tq is really a myth.  It only last 1-3 secs... and is caused by the high start up current in the
  motor itself.   I measured several of these small dc and ac motors..and they typ have a start up current
  of triple the running  current.

  Jim   VE7RF

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