Mike,
First off, your sq ft rating seem awfully LOW to me. My 2L40 is around
6.5 sq ft so I really have to wonder about your numbers for a 3L40.
Also, why would you put a 3L40 at only 56 ft? Most of your radiation
will be above 20 degrees, and the pattern of a 3L will cut into the
higher
angles. I would recommend either going higher (80' to 100' works GREAT
on 40M) or go with a 2L40 instead.
A 50 MPH rating is worthless. The wind pressure goes up as the SQUARE
of the windspeed so at 70 MPH, you DOUBLE your windload, and 70 MPH
is kind of a MINIMUM value I would design for. My towers / antennas
survived
a 90 MPH mini-tornado that took dozens of big and old trees out in my
woods.
de Tom N4KG
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