Dean,
You could install some sort of stopping flaps (speed brakes) on both sides of your sub that are curved to fit the shape of your hull. Much like a US Navy test sub USS Albacore. Then operate them with hydraulics or adapted electric actuators starting with a unit like the Lenco Trim Tab actuators.
I've been planning on having this type or braking system on my winged underwater gliding subs. With two stopping flaps on the training edge of the wings. One opening up, and one down at the same time.
"Built as a test bed for the U.S. Navy, the Albacore featured a
tear-drop shaped hull, new diving controls, a dorsal rudder and a new
high-yield steel for her pressure hull. In addition, the Navy, at one time
or another, experimented with speed brakes, contra-rotating screws, a
drag chute, camouflage paint and three different arrangements of stern
control surfaces. The NSF report ignited debate within Navy circles over a variety of
issues such as the merits of twin propellers vs. singles, and the sacrifice
of surface stability for undersea speed. The result of the recommendations
and ensuing debate was the U.S.S. Albacore.
The Dorsal rudder was reinstalled and enlarged and the boat
was outfitted with speed brakes. These brakes - another concept borrowed
from aviation - technology, consisted of 10 hinged panels ringing the
after part of the ship. When needed, they were hydraulically opened into
the waterflow, bringing the boat to a rapid stop."
http://www.hazegray.org/navhist/albacore.htm
http://en.wikipedia.org/wiki/USS_Albacore_(AGSS-569)
Regards,
Brent Hartwig
From: Recon1st@aol.com
Date: Mon, 25 Aug 2008 18:55:44 -0400
Subject: Re: [PSUBS-MAILIST] Air Tanks
To: personal_submersibles@psubs.org
Frank I am using 12hp for my main propulsion. I gave up trying to calculate
speed but I should have
plenty. The reason for so much maneuverability is the bottom of Lake
Superior many granite boulders
etc. I will need to travel pretty fast to cover any amount of the Lake. I
am thinking of a 20 to 30' above the
bottom but at 6 knots or so when one of those big beast jumps up in front
of me, I am going to need
options. A transfer pump or sliding weight for sure would not fit my needs.
I may even have an
emergency sea anchor deployment for quick stops. Reverting back to my drag
racing days.
I loved the dry dive video. I learned much watching it maneuver I have
greater confidence that my
efforts should yield the kind of performance I am looking for. Not to
mention it oughta be a real
hoot to drive hehehhe
Dean
In a message dated 8/24/2008 8:15:39 P.M. Central Daylight Time,
ShellyDalg@aol.com writes:
Hi Dean. I think you're chasing the right idea with front and back
dive planes. I had considered that but let it go because of the extra work. It
just seems to me that back dive planes would be a real plus if you have enough
power to make them work. Did you see the "dry dive" videos? With the center
mounted dive planes the sub stays level when ascending/diving but it would be
nice to be able to angle the sub just with the dive planes. Like you say, much
like flying. I don't know how much speed you'd have to get to make the dive
planes overcome the front/back balance, but if it's close enough to neutral,
it may not take that much power.
Twin trim tanks front and back with a transfer pump would help if the
pump was able to shift weight fast enough. Maybe a sliding drop weight would
be less trouble to make. I will be able to shift the seat forward and
backward a little and I'm hoping that will give me a little angle change.
Damn, I wanna get this thing wet soon! Frank D.
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