Re: [PSUBS-MAILIST] Dive planes

["Jens Laland" <laland@artematrix.org>]

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.
**





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