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In in-water testing near a boat ramp with early passive sonar hydrophones, I was flabbergasted at how well I could hear boat motors and props especially when they throttled up to aid in getting the boat and trailer out of the water. I was later dumbfounded when a rather large boat did this and only the engine could be heard...Later when the boat was out of the water I saw why... It had two counter rotational props on a single drive shaft outboard! Had it not been for the gas motor itself, this particular boat would have been an issue with any collision avoidance sonar system. If such a drive system could be installed aboard a small submarine and driven by an electric motor, I could attain the speed desired for planes control as well as reduce self generated noise to better aid in passive sonar searches. David Bartsch > Subject: RE: [PSUBS-MAILIST] counter rotational > From: MerlinSub@t-online.de > To: personal_submersibles@psubs.org > Date: Thu, 30 Dec 2010 08:20:00 +0000 > > > Put the shafts and gear in water and seal just the motor... > > > "David Bartsch" <dbartsch2236@hotmail.com> schrieb: > > > > Thanks gang, > > > > Torpedo use is definitely out. After a little thought I think the real problem when using such a drive on a submarine would be to be able to seal these two separate shafts from leakage from sea pressure. Still, placing two such props inside a kort nozzle could give some awesome results...I'll follow up on your provided references. > > > > David Bartsch > > > > > > From: JimToddPsub@aol.com > > Date: Thu, 30 Dec 2010 02:08:21 -0500 > > Subject: Re: [PSUBS-MAILIST] counter rotational > > To: personal_submersibles@psubs.org > > > > > > > > David, here are a couple of links re contra-rotating shafts. > > -Jim > > > > http://www.springerlink.com/content/t821016235773860/ > > > > http://www.maxxprod.com/mpi/mpi-266.html > > > > > > In a message dated 12/30/2010 12:03:38 A.M. Central Standard Time, dbartsch2236@hotmail.com writes: > > Anyone have a clue as to how a single shaft dual rotating propeller gear box works? Drawings? > > > > David Bartsch > > = > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > 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 > ************************************************************************ > ************************************************************************ > ************************************************************************ > |