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Re: [TowerTalk] Help With Rohn 25 and Winch

To: towertalk@contesting.com, k3hr@k3hr.com
Subject: Re: [TowerTalk] Help With Rohn 25 and Winch
From: Grant Saviers <grants2@pacbell.net>
Date: Wed, 20 Jul 2016 19:43:09 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
As long as your eave is strong enough, that winch should do the job without any more pulleys to gain mechanical advantage. That assumes the other pulleys are good ones with low friction, although it is not clear in your post what "a series of pulleys" means. 800# pulleys vs 2000# winch seems like a bad idea. The cheap (eg Zoro) 800 and 2000# pulleys and turning blocks are steel pulleys on steel bolts, without grease fittings or bronze bearings, pretty much junk for your application since they are out in the weather and probably not rated "for lifting".

It would be wise to add a 2 x 8 or larger inside the eves across several studs and bolt thru with threaded rod to the top turning block. Better yet, add some diagonal bracing (e.g. an angle iron with end cut and bent and drilled for lags or bolts) from the 2 x 8 back to the attic floor, onto a 3/4" sheet of plywood nailed or screwed to the joists. Eave studs have little structural resistance to pull over and the sheathing only has small nails holding it onto the studs. I've done this at two houses, one with a 30' of R25 and a bigger beam on 15' of exposed mast and they and the house survived hurricane winds.

Grant KZ1W

On 7/18/2016 9:15 AM, Ross Lambert wrote:
I put up 16 feet of Rohn 25 g ( 10 foot section and a 6 foot section. )
This tower is bolted to upper section of house near eave of  house at the
10 foot up from the
a 3 ele tribander (TA33M ) and a 3 element 6 meter beam is going on it.
The tilt over base is on a flat roof .
I would like to use a winch and block and tackle to tilt over and tilt up
tower.

I bought a D and L WG2000 worm gear winch
7/32 aircraft winch cable

I plan on routing the cable through a series of pulleys rated at 800 lbs up
to the ten foot level

The question is should I use a block and tackle arrangement between the
wall of the hous and the tower?

And will this short tower be ok with the winch?  I'd like to be able to
raise and lower the tower with the antennas on it.

The antennnas dont weigh much. The tribander  will be just above tower top
and the 6 meter 4 or 5 feet above.

Any comments or suggestions?

Please copy your response to e-mail address below

Ross

K3HR

k3hr@k3hr.com
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