Re: [TowerTalk] rotating tower or stack : rpm

[John Simmons <jasimmons@pinewooddata.com>]

Richard,

While I don't have a stack, I have used the same TailTwister rotor since 
1985 without it requiring service with a 34' boot yagi. As many know, 
the T2X has a manual soft stop mechanism operated from the control box 
which allows the rotor to coast to a stop before the brake is engaged. 
It has worked flawlessly for me for 30+ years. If the rotor motor is not 
over-powered, the normal inertia of the array combined with the motor 
spool-up will provide adequate soft start performance. Although it 
requires manual dexterity and is prone to operator error, I like the T2X 
system for soft stop. Various electronic soft stop mods have been around 
for the control box for years and would be a good idea, too. Operation 
is very simple: delay the application of the brake for several seconds 
after power is removed from the motor. Take your choice of 
implementation: manual, cap/resistor combination or 555 timer circuit 
(or some other timer). Use the KISS principle!
73,
-John NI0K

> Richard Riley <mailto:Richard.Riley@tango.hr>
> Wednesday, October 04, 2017 11:54 AM
> Hi guys,
>
> my previous post (reference soft-start and frequency regulation of 
> motor on a rotating tower) drew no responses :( :(...
> ...so I'll try it from another angle. I'm about to erect 102ft of 
> 20inch- to- a-side, triangular rotating tower (loaded with 12-15m 
> boomed monobanders from 40-10) on a 3 phase motor, with a projected 
> speed of 1rpm..and am concerned about the potential for start/stop stress.
> You have a large stack or a rotating tower.
>
> How fast does it rotate?
>
> Have you employed a soft-start-stop system to prevent mechanical shock?
>
> If so, what did you choose?
>
> Your input appreciated!
>
> 73 9a1tt
>
> Richard Riley
>
> mob: +385(0)993 994 995
> direct: +385(0)1 5494 303
>
>
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