|
Brent, High speed submarines have a defined speed/depth operating
envelope that they operate within. Outside leads to a rapid depth excursion
and potentially exceeding test depth and/or crush depth. All subs fear
jammed dive planes especially during high speed maneuvers which would force the
sub outside of the safe envelope. In the case of the Albacore, the
drogue deployed from the edge of the fairwater (pulling from the aft upper end
of the sail) caused a torque to be exerted on the hull, pulling it up out of a
dive. The flaps just killed forward speed and thus assisting in keeping
the sub operating within the safe speed/depth envelope. Many things were
tried on the Albacore as this was all new operating ground since no
other submarine had been able to operate at these speeds before. Most of
the concepts tested on the Albacore never made it out into the fleet as
they were not practical or were found not to be needed. Fleet subs purposely operate a good distant off of the bottom to
avoid unintentional collisions and unfortunately those few times that they have
met with an uncharted sea mount or guyot have been tragic for the crew and
resulted and damage that cannot be economically repaired…the sub usually
has to be decommissioned. In the case of typical PSUB-sized submersibles, high speed
(greater than 3 knots) will have difficulty stopping or rising sharply in time
to avoid obstacles in semi-murky water (visibility ~20 ft.). This is
evident from experience gained working with human-powered submersible races.
While these subs do not weigh all that much, they entrain a weight of water
that is less than or comparable to that found in a PSUB. They go faster now,
but my experience trying to stop and/or divert our record breaking sub doing
3.94 kts. at the end of the lengthy tank run was very difficult. This was
with the crew stopping the prop and putting the fore & aft planes in a “hard
rise” position. When a submersible did get away from the “catchers”,
they were often damaged by the wall or the tank end. The “catchers”
were lucky that no broken bones occurred as getting hit by a sub was very
painful and left you black and blue for days. R/Jay Respectfully, Jay K. Jeffries Andros Is., Bahamas Talk sense to a fool and he calls you foolish. - Euripides (484 BC - 406 BC) From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent
Hartwig Dean, "The parachutes were attached to the after end of Albacore's fairwater Regards, From: brenthartwig@hotmail.com "Built as a test bed for the U.S. Navy, the Albacore featured a The NSF report ignited debate within Navy circles over a variety of Regards, From:
Recon1st@aol.com 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:
It's only a deal if it's where you want to go. Find your
travel deal here. |