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California Spearfishing Talk here about spearfishing on California's Pacific Coast, and post those reports and photos! |
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07-08-2018, 10:58 AM | #16 |
Registered User
Join Date: Sep 2016
Posts: 57
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Re: Float Stackup
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07-08-2018, 06:32 PM | #17 | |
.
Join Date: Oct 2003
Location: Palm Bch County
Posts: 11,256
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Re: Float Stackup
Quote:
The 15 L & 30 L floats have a max pressure of 21 psi which can provide 100% of the lift at about 45 feet. The much larger 60L float has a max. pressure of 15 psi which provides 100% of the lift capacity at a depth of about 35 feet.
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07-09-2018, 09:38 PM | #18 |
hoos your daddy?
Join Date: Sep 2004
Location: Cali
Posts: 2,124
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Re: Float Stackup
how did you calculate those curves in the image?
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01-19-2019, 02:12 PM | #19 |
Kayak spearo
Join Date: Oct 2011
Location: Quebec, Canada
Posts: 112
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Re: Float Stackup
It seems he made an isothermic assumption (that the air stays at the same temperature), which is not realistic. Things happens too fast for that to happen when a float goes down pulled by a big fish. The result of this assumption gives a volume that is inversely proportional to pressure (hence depth). In almost every discussion about floats, people seems to make that assumption.
The air in the float will more realisticaly go through an adiabatic process (no heat exchange). The volume will fall more slowly than in the isothermic assumption because the air will heat up as the pressure rises. Here we can see the difference between the two assumptions for the Gannet 100. Last edited by Stephane; 01-19-2019 at 08:19 PM. |
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