Here is a quote from the plague on the Dennock Submersible
"TAILCONE - The tail structure serves a dual purpose. It protects the
hoses exiting the rear of the submarine and maintains stability during
rapid accent. Without it, a phenomenon known as "vortex shedding" would
cause the relatively bulbous submarine to oscillate uncontrollably
during surfacing, similar to the way a leaf falls."
Because of this, I would consider adding large stern control surfaces, and perhaps make the stern fairing longer.
Brent
From: "Lil Brother LLC" <lil_brother_llc@bellsouth.net>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] X Thruster Arrangement
Date: Mon, 23 Jul 2007 22:57:25 -0500
Frank,I hate to hear that......but it's better to find out on the model, than on the real thing.I would like to know how stable the craft is on the move to the surface?Seems to me if you were rising to fast, it would tend to wobble. (I have an aerodynamic background, not as an engineer, but I did work and study aircraft for quite some time.)James Long
Owner/Designer
Lil Brother LLC (Instrument Division)----- Original Message -----From: ShellyDalg@aol.comSent: Monday, July 23, 2007 10:36 PMSubject: Re: [PSUBS-MAILIST] X Thruster ArrangementThanks James, It used to look a lot more like a flying saucer, but the original ballast tank design failed miserably in model testing.Still learning from my mistakes. Frank D.
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