Re: [PSUBS-MAILIST] Sgt.Peppers at 700 feet

[MerlinSub@t-online.de]

Hi Cliff

"Cliff Redus" <cliffordredus@sbcglobal.net> schrieb:

> Very impressive Carsten both the successful test of Sgt. Pepper to 700 fsw and the pressure chamber.  Can you tell us a some details on how the pressure test was conducted? 

Specifically:

Did you use procedure from one of the classing organizations like ABS or Lloyd's?

No class - just old iron from a scrapping place and a calculation and a pressure 
test of the empty only water filled chamber. 

What are the chamber dimensions?

Inside is 1500 mm diameter by 4000 mm length. 
Chamber has 3 ts own weight by 16 mm thickness. 
Water weight is 7 ts.  10 ts total. 

What is the maximum pressure the chamber is designed to operate at?

22 bars. 

Did you instrument the pressure hull with strain gages?

No. we instrument the chamber with a videocamera and a very sensity microphone. 
You can here if it drops into the sub - even single drops. 
A microphone is very helpfull tool for leak test. 

How many simulated depth stations did you stop at and for how long?

At 21 bars about 10 Minutes, during the manned test at 5 bars about 5 Minutes and at 10 bars only
a minute or so because one ball vale (the snorckel vale)was damage by ice overnight and leacking.  
This small leak - a crack on the ball vale prevent to go deeper to 15 bars. :-(
We have allways problems in winter times with our boats. Last year during the lake deep test of 
Nemo I we has also a ice broken ballvale. 

With this 700 fsw test, what will you set the maximum operating depth for the boat?

800 ? Smile.. no at the moment  I would say 350 feet - 400 feet (100 -120 Meter) is okay.

Can you send me the pressure chamber so I can test my boat!

The pressure chamber has no propulsion, but your boat has - so you have to drive with the boat.. 

You are welcome - maybe at the Kiel Convention 2009 

best regards Carsten 
  
Cliff
 



----- Original Message ----
From: "MerlinSub@t-online.de" <MerlinSub@t-online.de>
To: personal_submersibles@psubs.org
Sent: Monday, February 18, 2008 2:49:00 PM
Subject: [PSUBS-MAILIST] Sgt.Peppers at 700 feet

Hi Submadmans, this weekend we drive to Berlin to our friends 
of the Küster's family from the Nemo project and run the new 
testchamber for psubs first time with a submarine inside. 

You can find the pictures at WWW.Euronaut.org under 
"bygone projects" - the last fife pictures on the page. 

Thank you to all members of the weekend with a lot of adventures and fun: 
Monika and Reinhard, Mirko and Claudia
Emile, Andre, Brian, Ramona and Charly. 

best regards Carsten



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603-529-1100
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