If you mean a 20 foot long heavy mast, I've done a 21 foot long SCH 80 2
1/2" pipe that weighs 165 lbs. We put it in and then took it out. I thought
the gin pole was going to bend but it worked. My gin pole is a WB0W with a
24 foot 1/4" wall tube. I replaced it with a 24 foot long 3" mast made of
6061-T6 aluminum, 3/8 wall weighing in at 96 lbs. The new mast was easier to
get in than getting the old one out.
I've seen XX towers put the same mast into R-45 using a gin pole made of R25
(with a climber on top of the gin pole!). They apparently do it all the
time.
Both towers have two thrust bearings (TB-4). One at the top and a second
about 5 feet down in the tower. The rotor can be pulled by just picking the
mast up and locking it in place.
I hope I got the right meaning of "20 heavy". Most of the time, "something
heavy" means a large aircraft to me (eg. Delta 435 Heavy), I'm also a flight
instructor.
73, Jerry - K0TV
-----Original Message-----
From: K7LXC@aol.com
Sent: Friday, April 19, 2013 10:00 AM
To: towertalk@contesting.com
Cc: wa7eqw@yahoo.com ; wa7eqw@gmail.com
Subject: [TowerTalk] Mast vs. 45G
Howdy, TowerTalkians --
I've never tried this so I thought I'd ask. Can you drop a 20 heavy
mast down and thru the tower? I don't think there's enough room but I could
be wrong. Tnx.
Cheers,
Steve K7LXC
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