smallfish
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Posts posted by smallfish
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24 minutes ago, peejman said:
An 8" x 5ft pipe is about 1.75 cuft in volume. Water weighs 62.4lbs/cuft, so the pipe and its contents must weigh more than 109 lbs for it to sink.
1000 rds of 5.56 in an ammo can weighs about 30 lbs, so you'd need about 3600 rounds plus a couple rifles to sink the pipe.You also suggested to fill it with oil, which is lighter than water. So you'd need more weight to overcome the buoyancy of the oil.
your calculation is correct, except the last statement - to sink the pipe "with air" you need 109 lbs. As oil is heavier than air, and about 0.8 of wight of water you need less metal if you fill pipe with oil. So, oil wight is 109 * 0.8 = 87.2 lbs and you need only 109 - 87 = 22 lbs of ammo which just about 1k of rounds.
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Hi everybody.
I recently moved ( escaped ?) from bay area / California to Knoxville. So far I was pretty busy with relocation / kids and schools / work etc. And only now it looks like I finally got some time I can spend on myself. Pretty common situation... I brought some stuff I could not use in Cali in hope to start shooting again more or less regularly. I prefer long range shooting, so planning to check if I can visit ORSA. Do you know if I can just stop by and apply for membership? I saw on their website that it needs to be sponsored by a current member, but unfortunately I know nobody in this area. I appreciate any advice, thank you in advance.
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> That won't sink.
really? A pvc pipe with metal stuff inside and filled with oil wouldn't sink?ok, a quick and dirty calculation: oil is about 0,8–0,9 kg/l ( let's say 0,8 ). water is 1 kg/l. so if you add at least 0.2 kg on 1L of internal volume ( neglect weight of pvc pipe) the whole construction will perfectly sink...
a reference guide : 1 kg is ~2 pounds, 1L is ~1/4 of gallon.
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i'd use pvc pipe/pipes and fill it with motor oil.
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I moved from Cali to Knoxville
in New Member Introductions
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Thank you, guys! Yes, I'm happy to be here and hope to become a useful part of local community.