I have a set of 20 year old AB-105 installation drawings
prepared for me and stamped by a P.E., but he died more than
10 years ago! I'll be happy to send you a copy if that would
Penn-Tech International still manufactures AB-105 under their
commercial model number 2400.
Here's a transcription of the Penn-Tech Model 2400 (i.e., AB-
105) Physical Properties. They are probably of little value to
you, but would be essential for a P.E. who might prepare
drawings for you.
Maximum practical height: 280 ft
Max allowable bending moment at tower top: 20,000 ft-lbs
Max vertical span between guys under max loading: 35 ft
Weight of steel per lineal foot of tower height: 11.2 lbs
Width of tower face between center of gravity of legs: 22.59 in
Projected area of one face per lineal foot of tower: 0.5513 sq ft
Wind pressure per lineal foot of tower: 27.99 lbs
Radius of Gyration (least) of tower: 9.04 ins.
Cross-sectional area of one leg: 0.603 sq in
Moment of intertia (least) of tower: 147.76 in**4
Distance from center of tower to center of gravity of leg: 13.04
Section modulus (least) of tower: 11.33 in**3
Section modulus of one leg: 0.171 in**3 least
Radius of gyration of one leg: 0.56 ins. least
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