wow!!! I want one.

[tspeer]

That's the idea. You need wings, and like any glider, low drag is important.

http://washingtontimes.com/national/...0253-7182r.htm
http://www.nationalgeographic.com/ad...211/q_n_a.html
http://www.space.com/businesstechnol..._020410-1.html
http://abcnews.go.com/sections/scite...dge021011.html
http://www.usatoday.com/news/science...-gliders_x.htm
http://www-pord.ucsd.edu/~rdavis/pub...s/4Gliders.pdf




You can even get them for your pool!
http://shop.store.yahoo.com/sgoldman/hydglidleops.html

[yipster]

Tom,
eek grin smile and WOW this is getting serious!
as for drag i noticed the seaglider uses the hansen & hoyt model

[tspeer]

Parsons also came up with a similar shape. It's clearly designed to have a favorable pressure gradient all the way back to the wing leading edge, promoting laminar flow over one-piece forebody shell.

Here's the story behind the internal hull design, with those rounded ridges. They're designed to compress under pressure so the glider has the same density as the ambient seawater. http://opd.apl.washington.edu/~dasar...H/Floats01.pdf

[yipster]

and the hull slims where the wings stick out giving it favorable drag overall
any idea why we havent seen say a sailboat tailored where the keel sits?

[fastwave]

Why would you want the junction of a lifting foil in an adverse pressure gradient?

[tspeer]

1. avoid disturbing the laminar flow on the forebody
2. there's no horizontal tail, so longitudinal trim has to be accomplished by proper placement of the weight and buoyancy relative to the wing quarter-chord
3. a steep adverse pressure gradient near the wing can offset the acceleration of the flow in the junction region, and the two partially cancel each other out for reduced junction drag.
4. stability considerations, again due to lack of horizontal tail

[fastwave]

1. Find me a sailboat with laminar flow back to the fin
2. Not relevant to a sailboat
3. Than means a double adverse gradient on the back of the wing
4. N/A

[Hisham]

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check this amazing game

silent hunter : http://silenthunter4.uk.ubi.com/

[Hisham]

do u love this submarine? you realy love U-boats (XXI- VIIC- VIIB,....)

want to be a captin of one of those U-boats with full control and unlimited simulation of every thing, playing and destroy the enemy destroyer

check this amazing game

silent hunter : http://silenthunter4.uk.ubi.com/
Edit/Delete Message

[yipster]

Originally Posted by fastwave

Why would you want the junction of a lifting foil in an adverse pressure gradient?

Originally Posted by tspeer

1. avoid disturbing the laminar flow on the forebody
2. there's no horizontal tail, so longitudinal trim has to be accomplished by proper placement of the weight and buoyancy relative to the wing quarter-chord
3. a steep adverse pressure gradient near the wing can offset the acceleration of the flow in the junction region, and the two partially cancel each other out for reduced junction drag.
4. stability considerations, again due to lack of horizontal tail

i was wondering about area rule and boats in general
at least i now understand why the 747 has a hump bulge shaped upperdeck

[achipmunk]

wo, it is really really something>>

[yipster]

science seem to apply, i think area rule is hot

[marshmat]

US Subs has made some changes to their website. The Phoenix mentioned at the start of the thread is now at http://www.ussubs.com/submarines/phoenix_1000.php3

For those who would rather feel like a dolphin than a whale, take a look at the Deep Flight subs http://deepflight.com/subs/index.htm