Jens, Great images, thanks! Is this the small sub they built to test anti-submarine tactics to combat Russian incursions with mini-subs? R/Jay Resepectfully, Jay K. Jeffries Andros Is., Bahamas Save the whales, collect the whole set. -----Original Message----- Frank Here is some images of the midget-submarine "Spiggen II" (Sweden's Navy) that I think illustrate what you talk about: http://img85.imageshack.us/img85/9428/p81752106wp.jpg http://img238.imageshack.us/img238/8436/teknikmassaochkarlbergsdag0232.jpg http://traktoria.org/spiggen2_plan_elevation.jpg http://traktoria.org/thruster650ZOOM.jpg The boat has no traditional rudder nor any dive planes, but uses a sort of Kort-nozzle that pivots both horizontally and vertically, giving very good handling characteristics at low speed. Best regards, Jens laland ** ** In a message dated 9/13/2009 2:57:55 P.M. Pacific Daylight Time, ** glenbrown@vodamail.co.za writes: ** ** .Without proper research any wing design could make the boat ** uncontrollable at slow speeds.This Is only my opinion I could be wrong. ** ** ** That's why I chose the combination of control surface ( dive plane and ** rudder) with the motors. ** At the slow speeds our subs have we need to "push" the water in the ** direction we want rather than relying on prop wash over a control surface. ** It's ** very difficult to get vectored thrust if your main motor is inside the sub ** with a shaft and all, but using just the Minnkotas is easy. Basically the ** rudder linkage pivots the motor too so no extra stuff. ** The down side to this is the relative low power available. With an inboard ** motor it can be as large as you have room and/or power for. Dean's sub has ** 10 horse or so doesn't it ? ** With the 4 motors I'm using it adds up to 10 horse at full power but my ** guess is that I'd probably "smoke" something if I ran all 4 wide open. ** Fortunately these little subs don't need to go very fast. If we're looking ** at ** stuff or near any rocks it's not safe to go fast anyway. ** I'm gonna try it wide open sooner or later just to see how fast it could ** go but that can't be good for the batteries or electrical system in ** general. ** Those motors pull 46 amps at full speed. If I multiply that by ** 4.......something's gonna blow! ** Frank D. ** ************************************************************************ ************************************************************************ ************************************************************************ 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 ************************************************************************ ************************************************************************ ************************************************************************ |
