The secret to using 4 inch irrigation tubing is to never drill
holes in it. Only clamp it using 4 inch Sch. 40 PVC pipe
as a collar. The nominal I.D. of that pipe is 3.999 inches
so it is a perfect fit for 4 inch O.D. tubing. Details on
this at: http://www.karlquist.com/Irrigation/irrigation.html
richard@karlquist.com
www.karlquist.com
>N6BV wanted me to write our experiences but I was too embarrassed to go
through
>all our blunders. Sometimes the verticals were up for only three days
>We did try 4" irrigation pipe but the diameter did not overcome the
weakness of
>the thin wall. After more than 2 years of trying different designs we ended
up
>where we are now. Great bandwidth with 2" pipe.
>Dick - KB1H
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