Re: [PSUBS-MAILIST] Regulator pression

Yes, Metal Anomality Detector(MAD), the stinger on the tail of the P3. I don't know about the uproar, i'm sure there was. The P3 can fly low and slow, which has been an advantage. The disadvantage was that those 4 big fans could be heard by the submarine miles away. Or even 2 big fans, 'cause they often shut down one, and sometimes 2 engines to save fuel at low altitude.

The British have or had (i really don't keep up) the Nimron, who's disadvantage was that it couldn't fly so slow. Easy to overfly the target. It's more related to the 737 than a P3.

Technology has soared so fast over the years. I flew in P3's in the early '80's and Moffett Field is all NASA now, the Navy moved out. Sound travels so fast and well in water. It's the easiest way to detect something underwater that has the potential to move. Every machine has a signature, electric motors, shafts turning, people talking. Electronics usually put out some RF, even if it's very slight. People talking probably not part of the machine signature!!

You can have 2, 283 (i'm old, i think they call them 6Ltr) Chevy engines built at the same place by the same people, and they will have 2 different signatures. The sound the crankshaft makes, the sound the pistons make. Once your engine is heard, it's signature is put into a computer, then when it is heard again, it is recognized, and distinguishd from any other 283 engine, or submarine.

I was flying P3's when CWO Johnny Walker was still in business. The Soviets just read all our top secret and any messages like reading a newspaper. There is a movie about him "Family of Spies". During that time, the Soviets learned that we were detecting them by sound. So, they started making their subs quieter. It did make it more difficult, but not impossible. Since then electronics have became far, far more sophisticated.

I don't know how Russian ships are now (or other former Soviet countries), and it's by no means my intent to speak adversly of them. In the past you could always tell a Soviet ship from miles away, if you see a giant rust bucket on the water it was Soviet.

As i understand the new P-8's are suppose to start showing up at PAX River Naval Air Station (home of NAVAIR, Naval Aviation Test Center) next year.

Paul Kreemer <paulkreemer@gmail.com> wrote:

On 8/28/06, Bob Duncan <katsurencho@yahoo.com> wrote:

Howdy

Having been a P3 engineer at one time, VP-9, Moffett Field. You could avoid them if there were MAD trapping. But, usually they listen in on sonobouys.

And the P3 is going away from the US Navy, the P8 is comming in soon, P-8 is a Boeing 737.

Paul Kreemer <paulkreemer@gmail.com> wrote:

Yes, PSUBers should consider plastic hulls to help avoid detection by sub hunting P-3 Orions. ;-) Regarding manufacture and use, this cautionary note from Dewey Mason sounds pretty informed on the subject: http://www.psubs.org/faq.html#fiberglasshull

Here are a couple of notes on cabin air from the PSUBS site. The cabin pressure would increase more slowly if you could add only oxygen and not air. And if your dive time is short enough you may not need to do scrubbing or oxygen replacement.

http://www.psubs.org/faq.html#cabinair

http://www.psubs.org/faq.html#lifesupport

A lot of design decisions here... Like many more experienced members have done, let me suggest buying some Kittredge plans. You can get the K-250 or K-350 plans here: http://johnmaynard.tripod.com/

take care-
Paul

On 8/26/06, Fanta < fanta590@yahoo.com> wrote:

Hello everyone,

I am doing some calculate on the paper about the air pression inside of the pocket sub.

If I use a tank of compression air for supply air to pilot, the pression inside of cabine up slowly, it need an system automatic depression, it means: return the pression as 1 atm. Here, some one has an idea about this system? Please drop for me a plan or some idea.

The second problem is carbonic air is up and I want to filtre air. Have you some advices about this?

I hear about sub spy of North Korean, base on information 3 years ago, its made by plastic !! diver very limit but low price and it is enough for past many stations control in South Korea. North Korea use this type for infiltration to South Korea, Are there someone here have more information about this type sub? I do interesting this because it is confortable for poor amateur sub builder.

Thank you very much

Fanta

Love and Peace, God bless you

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Re: [PSUBS-MAILIST] Regulator pression - Korea plastic sub