The long lasting reliability of trapped air is sketchy, but 1 to 2 foot of air trapped in the top of the PVC pipe should keep it upright given that the rest of the structure is made of plastic tubing that has a specific gravity closer to 1 and not trying to drag it all down. PVC is one of the heavier plastics with a SG of 1.4 so it wants to sink. Most other tubing plastic's SG are much closer to 1 which is what water is. These plastics may float, sink slowly, or merely hover depending on what side of a SG of 1 they fall. With all that mumbo-jumbo said...it would not take much tipping of a rather full bucket base of concrete to take it all down with trapped air being its only means of staying upright. I would suggest forgoing the trapped air and putting some scrap pipe/rebar/angle/whatever (approx 4' long each) through the bottom of the bucket to make and "X" before pouring in the concrete. This "X" will give the whole structure some stability and keep it upright without the trapped air.
I have some 10' sections of 4" PVC pipe left over from another project that I am thinking of making into fish structures.
My question is if I weight the bottom and cap the top end to leave 1-2' of trapped air(drilled holes & tubing below that) will this provide enough buoyancy to keep it upright?
Pics from 2015, and they're still doing their job. 2 bottom floating trees, and the beginning of X frame bottom cover.
Detailed view of how I anchor them. It takes very little anchor weight if the holes are drilled at the correct distance from the top cap. I would drill 18" to 2' down, then redrill another hole above those(if needed) to get the buoyancy correct. The holes for the "limbs" should be loose, or the trees won't sink correctly.
[quote=Quarter Acre. I would suggest forgoing the trapped air and putting some scrap pipe/rebar/angle/whatever (approx 4' long each) through the bottom of the bucket to make and "X" before pouring in the concrete. This "X" will give the whole structure some stability and keep it upright without the trapped air.[/quote]
for ruffing up, I just used my electric hand grinder, even a hand drill with a wire brush attachment will do it also. It's pretty easy. After ruffing it up I added some camo spray paint to cover up the white pipe. The first of the five-gallon buckets of PVC I added I left white and now I never see any fish around those buckets.
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City dad...I use old Christmas tree artificial garland and trees and wreaths for itty bitty fish. Has worked great for several years. I find it in garage sales a lot and sometimes people just give that junk to you!
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I am no gill net expert, but might that netting trap a fish on occasion? I know my fish trap with 1/2 square wire cloth will occasionally be pulled with a fish half stuck in a hole. It does not happen very often, but something to consider if a better material could be used.