Hi Rick es HNY !
TU for that advice. I need to look up the weight of the heavier duty
fence pipe. As these are going to be elevated verticals which I "pivot"
into place by myself I need to look at what the total weight will be. I
have about 8' of 6x6 set in the ground then use a wooden frame that
cradles around the 6x6 and pivots the verticals into place. Kinda hard
to explain but it will put the feedpoint at around 10' off the ground,
then of course the length of the vertical. So I should be able to walk
it up into place. Will check it out TU.
But let me ask my question again, is it better to go with a larger dia
pipe (even if it has a greater wind load) or better to go with a smaller
dia tubing with less wind load? Assuming the wall thickness is the same
for all the members.
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 1/1/2020 12:23 PM, Richard (Rick) Karlquist wrote:
Recommend that you consider chain link fence "top rail" instead
of EMT. Get the "1 7/8 inch" OD variety. It is the same
diameter as "1 1/2 inch" water pipe. It is actually intended
to be structural. There is also a "1 3/8 inch" OD variety than
you can telescope. It is the same diameter as "1 inch"
water pipe.
Rick N6RK
On 1/1/2020 8:13 AM, Gedas wrote:
HNY to all !
I cannot think of a better time to start a new 40m phased vertical
project then the dead of winter with snow on the ground (as usual I
could not get to it during the summer or fall).
Anyway, I have drawn up two possibilities for a pair of 33' self
supporting verticals. Both start out with a 10' length of EMT but one
choice starts out with a larger dia then the other before I switch
over to tapering aluminum sections.
A) Starts out with a 10' length of 1-1/4" EMT followed by tapering 5'
sections of aluminum tubing (4' long exposed, 1' inside the previous
lower section) until the very top length section which will be 3/4"
OD dia. These will be standard DX engineering aluminum tubes.
B) Starts out with a 10' length of 1-1/2" EMT, then a 5' length of
1-1/4" dia of EMT (4' long exposed, 1' inside the previous section of
EMT) then followed by tapering 5' sections of aluminum tubing as
above. The only difference being this choice would end up using 1"
aluminum tubing as the very top piece.
So the obvious difference between the two are that choice A) uses
just one length of thinner EMT and overall thinner aluminum tubing
sections to the top while choice B) uses 2 lengths of larger dia EMT
and then larger dia aluminum tubing to the very top.
I do not have the software to analyze choice A) vs. choice B) in a
high wind situation. I am uncertain if the stronger, larger dia
tubing with it's higher wind load will be a plus or a minus in the
end to it's overall strength. Any thoughts or comments on which one
will survive better during heavy wind conditions? TU
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
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