[TowerTalk] Biggest rotor that will fit in a Rohn 25G

[Danny Pease]

Jeff, yes, a small AlfaSpid will barely fit inside of Rohn 25G tower, we put
one in a 112 foot Rohn 25G tower at N9JF's, about 8 feet down from the top.
It was not easy and we did have to slightly bend one of the diagonals to get
it centered. It is turning a 2 element 40 and a 5 element 10 meter beam with
ease. The biggest drawback I saw was the rotor control box does not allow
the rotor to ramp up or ramp down and when it starts turning, it does put a
good bit of twist to the tower, even with anti-torque arms. Same applies to
stopping, when it stops, there is no slowing down, it simply stops turning.
A different rotor controller would be needed to allow a softer start and
stop.

Danny NG9R


Message: 4
Date: Thu, 21 Jul 2016 16:35:16 +0800
From: "Jeff AC0C" <keepwalking188 at ac0c.com>
To: <towertalk at contesting.com>
Subject: Re: [TowerTalk] Biggest rotor that will fit in a Rohn 25G
Message-ID: <B6F579A9BC7848928C0EF500FF4A8C57 at w520>
Content-Type: text/plain; format=flowed; charset="UTF-8";
	reply-type=response

I want to focus the question at hand on turning and braking ability.

The nightmare around this part of the country is to wake up and see your
beam pin-wheeling around due to a brake failure or the fact it won't turn
anymore.  This always happens right at the start of winter so guys can sit
out all winter season wishing they had put a rotor up with a bit more
brawn...

All the other issues, while significant, fall into the "items to consider
down the road" category.

Will the small Alfa-SPID fit inside the 25G?

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie