What I really like is the 4-thruster configuration Phil Nuytten uses on his boats... no moving parts, and an additional degree of motion. This is the configuration whereby two thrusters are astern pointed fore and aft. Those of course allow you to go forward and backwards, or also to rotate. But with the second pair amidships angled outwards at about 45 degrees, you can either go up and down, or if you fire one at a time, you can move sideways. The sideways movement is what I don't think any other configuration can do unless of course you put in a sideways thruster like a bow thruster in a surface vessel. cheers, Alec -----Original Message----- From: Mark [mailto:gadgetsboy@ntlworld.com] Sent: Fri 8/13/2004 11:00 AM To: personal_submersibles@psubs.org Cc: Subject: Re: [PSUBS-MAILIST] Oh !! the choices I'll take it from the lack of responce that I'm not the only one pondering :) Mark ----- Original Message ----- From: Mark <mailto:gadgetsboy@ntlworld.com> To: personal_submersibles@psubs.org Sent: Wednesday, August 11, 2004 4:00 PM Subject: [PSUBS-MAILIST] Oh !! the choices Can anyone tell me which is a better system? Rear mounted prop and control gear as used on the wwII German Biber (or Beaver) sub or the dive plane mounted prop as used on the sportsub. What are the advantages and disadvantages of each system? I am trying to design an ambient pressure sub and cannont find enough evidence to make a choice. If anyone can suggest any material that would help me make the decision that would be great. Also has anyone ever built a Delta wing? http://www.scubatow.com/sub.html as I find the plans a little lacking in some areas Mark
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