[Date Prev][Date Next] [Chronological] [Thread] [Top]

Re: [PSUBS-MAILIST] How heavy can I go?

You'll need to calculate the total volume of the hull ( measured from the outside of the hull), and subtract the interior volume of the ballast tanks. Figure out how many gallons of water that volume displaces ( V / .13368 ) and multiply that number by the weight of one gallon of water (different for fresh and salt water). That is how much your sub needs to weigh. Any more and it won't float, any less and it won't sink.
 
JP
 
----- Original Message -----
From: Gregory Snyder
To: personal_submersibles@psubs.org
Sent: Monday, April 08, 2002 6:53 PM
Subject: RE: [PSUBS-MAILIST] How heavy can I go?

Exactly my point.

I have a modified resortsub (sportsub II)  but how do I calculate the weight once I close the cabin off, capturing that bubble?

Thanks-

G

 

-----Original Message-----
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of AndrePevestorf@aol.com
Sent: Monday, April 08, 2002 7:18 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] How heavy can I go?

 

Hi Greg,

Which one do you mean ? SportSub No. I or II ?
generally speaking you have to compensate the extra bouyancy with extra wight.
The extra bouyancy is given by the extra volume ( of air in this case) and considering the salt content.
The extra wight is equal to the extra wight of the displaced water but keep in mind that the wight of some steel or lead blocks are not the same under water as on air. (because the displace water themself)

A.