Per the drawings, the standard Rohn 45G foldover winch is indeed a
Dutton Lainson B2503 brake winch. That's a 2500 lb winch with a 12:1
gear ratio and a 3 1/8" drum hub.
Unfortunately they are very hard to find.
The 300 lb pull is the minimum static cable load recommended by Dutton
Lainson to ensure proper operation of the brake. At the handle, it's no
big deal.
regards,
Mahlon - K4OQ
>
> Subject:
> Re: [TowerTalk] OK for Rohn 45 Tiltover - Dutton-Lainson 2500?
> From:
> "David Hachadorian" <K6LL@adelphia.net>
> Date:
> Tue, 4 Oct 2005 12:48:39 -0700
> To:
> "Towertalk Reflector" <towertalk@contesting.com>
>
> To:
> "Towertalk Reflector" <towertalk@contesting.com>
>
>
>
> ----- Original Message ----- From: "kd4e" <kd4e@verizon.net>
> To: "towertalk reflector" <towertalk@contesting.com>
> Sent: Tuesday, October 04, 2005 7:14 AM
> Subject: Re: [TowerTalk] OK for Rohn 45 Tiltover - Dutton-Lainson 2500?
>
>
>> >> Would this be appropriate to use with a Rohn 45 tiltover?
>> >>
>> >> http://www.shootnhunt.com/catalog/JM/boat_trailer_accessories/
>> >> dutton_lainson/5801968.html
>> >>
>> >> It will be lightly loaded with a F12 C3SS, a vhf-uhf >> vertical,
>> >> and perhaps a couple of small antennas side-mounted.
>> >>
>>
>>> Try this for a lot less.
>>> http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=5798
>>> Gear driven, no chance of unwinding, can be operated by 1/2" or larger
>>> electric drill by taking off handle and double locking a pair of
>>> nuts with a
>>> lock washer in between and using a socket on the drill.
>>> Cheep, accessable, available, replaceable, works well. Lots of turn
>>> of the
>>> handle but with the drill, 5 min up or down!
>>> Mike Baker K7DD k7ddmjb@qwest.net
>>
>>
>> My Rohn manual specifies 1/4" aircraft-grade stainless steel cable
>> and a 35' cable length.
>>
>> I like the ability to use both manual and electric power but
>> want to meet, and preferably exceed, Rohn's specifications
>> for the Rohn 45 fold-over.
>
>
> I think Rohn uses a "Brake Winch." At least that is what came with my
> 30 year old 25 foldover. With a brake winch, you can take your hand
> off the handle at any time in the raising or lowering process and the
> tower will not move. Here is Dutton's web page for brake winches:
> http://www.dutton-lainson.com/mfg/brakewinchspecspage.html
>
> Note the column "min operating load required." I think what this means
> is that, if you don't have at least this minimum load, the winch will
> not unspool, because there will be inadequate tension on the clutch.
> Notice that the higher you go in winch load capacity, the more you
> will have to exert a mighty tug to get the tower to start tilting
> over. If you don't have the minimum load, the handle will unscrew and
> come off! No damage done, though, because the clutch will still be tight.
>
> The one that came with my 25 foldover is the Dutton B1200. It still
> works after 30 years out in the weather (such as it is in Yuma). I use
> the winch every 3 years or so, and sometimes have to disassemble it to
> service the clutches, because they get stuck together. Rohn uses the
> same part number for 25 & 45 winches these days, but I'm not sure if
> it's still the B1200. I would hate to think of having to exert a 300
> pound pull to get the B2500 started!
>
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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