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@telus.net> wrote:
> Date: Tue, 21 Oct 2014 14:10:38 -0400
> From: K7LXC--- via TowerTalk <towertalk@contesting.com>
> To: towertalk@contesting.com, maflukey@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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