The tower is constructed from schedule
40 steel 2.875" OD tube. It is 36' tall. It is made from a
15' piece coupled with an extruded aluminum coupler. Guy wires
support it at the 15' and 30' level. A rotary thrust bearing sits
at the top for the generator. Steel plates make up the base which
also holds a 15' tube for the lever arm. This is called the Gin
pole. 1/4" steel cable serves as the guy wires. The Gin
Pole is actuated through a coupler to a chain connected to the winch
cable. The pictures below show the tower ready for lifting.
The next set of pictures shows the winch setup.

The winch can move 2500lbs. I welded a platform out of 3/16"
steel angle iron to give the winch arm plenty of clearance from the
ground. The platform is bolted to a concrete pad using 4 1/2"
anchor bolts. The concrete pad is 10-12" in diameter and 3'
deep. I used 6 pieces of rebar, 4000psi fiber reenforced concrete
to reducing cracking, and 18" long 1/2" J-anchor bolts.

Now for some physics. The concrete can withstand 4000psi in
compression. Conservatively, it can take 5% of this for shear
forces. 0.05 x 4000 = 200psi. Now the surface area of the
anchor bolts is pi*D*L, which is

3.14*0.5*(17" of submerged bolt) = 26.7

Now, multiply by the number of bolts = 4*26.7 = 107sq inches

The shear force the four bolts can hold in the concrete is 107 sq in *
200lbs/sq in = 21,400 lbs.

This seems like a lot. The bolts will give before the concrete
lets them go. In other words, the winch is not moving anywhere.

What forces will the winch see? The tube weighs under 6lbs/ft and
is 36' long. The generator, blades and tail probably weigh close
to 60lbs.

Tube: 6lbs/ft * 36ft = 216lbs. Center of gravity at 18'. Momement =
216*18 = 3888ft-lbs

Generator moment: 60lbs * 36ft = 2160 ft-lbs

Total moment = 6048 ft-lbs

The maximum force will be when the tower is at zero degrees and the gin
pole is at 90 degrees. The 15' gin pole needs a moment equal to
the tower-generator moment:

15' * X = 6048

X = 403lbs

The winch cable pivots 20' from the tower pivot and connects to the top
of the 15' pole, making an angle of 37 degrees. Using basic trig:

403/F = cos(37)

F = 504 lbs

So, my winch will easily handle 504lbs of tension on the cable.

The anchor is made from 1/4" angle iron and welded into a T shape. The base is about 3.5' wide. The anchor is sprayed with Rustoleum. The hole is more than 1/2" from

The guy anchor is to the left and is close to a 50deg angle with the ground. The pulley anchor is close to vertical. The cable running through it is connected to the winch. The pulley has a minimum breaking strength of 7500lbs and can accommodate a 1/2" cable. If I use 25% safety factor I can have 1875lbs of pull on the chain which is rated for 2000lbs. I got the pulley from CMI Gear.