[TowerTalk] Fwd: [Bulk] Re: Fwd: Aluminum towers -- can you really "walk one up"?

[Hans Hammarquist via TowerTalk]

No no no, I didn't say that I walked my 85' tower up. There I used am a 32', falling derrik and a "Come-along".


Hans - N2JFS



-----Original Message-----
From: Grant Saviers <grants2 at pacbell.net>
To: Patrick Greenlee <patrick_g at windstream.net>; towertalk <towertalk at contesting.com>
Sent: Mon, Mar 9, 2015 10:07 am
Subject: Re: [TowerTalk] [Bulk] Re: Fwd: Aluminum towers -- can you really "walk one up"?


nope,  as you walk in, more of the weight of the tower is behind you.  
Another
way to think about this is what size torque wrench would you 
need to raise the
tower if it was attached to a hinge bolt?  Ans: HUGE.  
A 300# 85' tower needs
a torque (moment) of 300*42.5= 12,750 ft-lbs to 
move it just up from
horizontal. Assuming the sections are uniform, we 
can use a mass one half the
length, so with a tapered tower it will be 
less.  Or you can weigh each
section, and use the distance to eacg 
section center when assembled and add up
the moments for a fairly 
accurate approximation of the initial raising
moment.