Hoffman Amplifiers Tube Amplifier Forum
Other Stuff => Other Topics => Topic started by: shooter on April 10, 2021, 05:58:14 pm
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I have a "leftover" helium tank, basically 4' X 8" (calculated Volume using 45")
the internet tells me Vol = .037067 M^3
what the ducks can't find;
the gas is at 2,000psi, I want it at atmosphere @ sea level
I have the density of He .179Kg/M
Got air at 1.29Kg/M
my endgame is to know, on a napkin, what the "lift" of my unknown volume can move with initial acceleration at 0
thanks
dave
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Medical(for MRI machines, usually )? Helium Trimix (eg welding gas, about 90 %)? Grade 5 (diving, usually 5000ppm or less impurities )? Balloon grade( about 80%)?
Going for a suborbital flight, are we?
If temp is constant, P1*V1=P2*V2: 2000psi * 37 liters = 14.9 psi * X liters
So you have about 5 m^3 of gas, or about 175 ft^3.
Lifting coefficient of helium is about 1.1kg/m^3, so you could lift about 12 pounds. Seems like it should be more.
That's my napkin, sans the ketchup I just spilled.
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thanks!!! :thumbsup:
I was guessing <20lb
thinking once friction and static weight is overcome maybe more, but your napkin value is good by me!
I'll keep to the ground, let my sUAV do the flying.
n ya 5 9's gas but i'm not that picky :icon_biggrin: