About 4,500 lbs ________________________________ From: owner-personal_submersibles@psubs.org on behalf of Rick and Marcia Sent: Thu 1/4/2007 10:42 PM To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] Thrust from a pump? Alec, regarding water pumps, how heavy is your sub? ----- Original Message ----- From: "Smyth, Alec" <Alec.Smyth@compuware.com> To: <personal_submersibles@psubs.org> Sent: Wednesday, January 03, 2007 2:20 PM Subject: [PSUBS-MAILIST] Thrust from a pump? I'm contemplating using water pumps as maneuvering thrusters (NOT for main propulsion). Cousteau's socoupe used a hydraulic pump for the jets, but I'd like to avoid that route if possible due to the excessive noise. DC submersible pumps are convenient but I haven't found anything beefy. I could try mating a trolling motor to a pump head. Submersible well pumps look promising because they're very powerful yet compact, but they require AC, and I don't think I can reverse them so I'd need four pumps instead of two. I could of course hang trolling motors off the boat font and back, but it really messes up the hydrodynamics of what can otherwise be a quite clean design, and the props on my trolling motors make them too large to duct into the MBTs. Assuming I do settle on some kind of pump, the next question is how strong it needs to be. Does anyone know how to translate GPM (or LPM) into static thrust? Any ideas or experiences would be much appreciated. Thanks, Alec The contents of this e-mail are intended for the named addressee only. It contains information that may be confidential. Unless you are the named addressee or an authorized designee, you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it. ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 53 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************ The contents of this e-mail are intended for the named addressee only. It contains information that may be confidential. Unless you are the named addressee or an authorized designee, you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it.