Date: Tue, 12 Dec 2017 15:40:22 -0500
From: k7lxc@aol.com
To: towertalk@contesting.com
Subject: Re: [TowerTalk] PST61 Rotor Reliability?
> ?Thanks for the reply, Steve, but I'm sorry ... that doesn't make sense.?
> Torque is torque, and it's in the same direction no matter which side of the
> mast is applying the torque.
?
Hiya, Dave --
?
? ? I'm ?not an engineer so I can't defend the conclusion that Dick Weber, PE
(don't remember his call) published and suggest you read his article in QEX.
Someone cited the issue and date of publication so it shouldn't be too hard to
find.
?
? ? It was a revelation to me and it might be to you as well after you read
Dick's article. I promise won't say I told you so - hi.
?
Cheers,
Steve ? ? K7LXC
## Steve et all, the fellow has a very unique situation. His tower and pair of
yagis are being hit by a mini tornado, thats 50-200 ft across, with 90 mph
winds.
In his one off case, adding a TQ comp plate will do nothing, except to
increase the load at the shorter end of the boom, and make things worse. He
doesnt
have wind from just the usual single direction, hes being hit by high winds
from several directions.....and simultaneous. Thats the worse nightmare
one could imagine.
The resulting TQ on his poor PST61 must be insane. Its one big corkscrew of
a windload.
## The only fix I can see that would work is possibly either the larger
PST-71 or PST 110, 115 or either small or medium sized PP from K7NV.
If it was me, I think I would opt to remove the PST-61, get it repaired, sell
it, then replace it with a PP. If you are going to spend $$ spend enough of
it
on a correct solution. The PPs all use planetary gears. The final gear is
driven in 3 places, every 120 degs. Every other rotor is driven in only one
place.
And dont even think about using a m2 OR-2800 or HDR-300, neither will last a
week.
Jim VE7RF
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|