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Jens, That is some really great information! David Bartsch > Date: Sun, 7 Sep 2008 23:06:11 +0200 > Subject: RE: [PSUBS-MAILIST] bubble pressure (Papenberger) > From: laland@artematrix.org > To: personal_submersibles@psubs.org > > Jay > > The Papenberg Tiefenmesser und Restauftriebsmesser (Depth Gauge and > Rest-Buoyancy Meter) 'belongs' to your category #1, the capillary gage. > > To use the word 'capillary' when talking about the Papenberger can be a > bit misleading since the inner diameter of the (plexi)glass tubing used is > often between 7 and 10 mm. > > I would therefore assume that this type of gauge would not be more subject > to error from clogging of the inlet than a Bourdon tube gage. > > However, I agree that the Papenberger should only to be used at very > shallow depths, normally down to 15 - 20 m (if going deeper the valve to > sea is closed). Having said that, I still think it would be quite useful > in a psub even down to around 80 ft (24 m). > > Please note that my previous mail to David is quoted below for your > information. > > regards, > jens > > ** David > ** > ** "The so-called Papenberg depth gauge is used by the German Navy for > ** precision reading at periscope depth. Ref.: > ** > http://lab.artematrix.org/submarine/images/project/papenberg_and_trim_principles.jpg > ** The measurement is based on the compression of an air cushion, and so the > ** reading in the cylindrical glass tube is not linear. The residual buoyancy > ** of the boat associated with its floating position is plotted on this > ** instrument in addition to the depth scale (starting with the surfaced > ** flotation line and decreasing to zero when the top of the superstructure > ** has been reached). Moreover, the contour of the cross section of the boat > ** is plotted in association with the depth scale (distorted). The water > ** level of the instrument is illuminated horizontally, and minute tendencies > ** for attitude changes can be identified from the curvature of the meniscus > ** before the water level in the tube rises or falls." > ** > http://lab.artematrix.org/submarine/images/project/papenberg_trim_sketch.jpg > ** (from the book: 'Submarine Design' by Ulrich Gabler) > ** > ** Here is a photo from inside an old norwegian (but german built) Kobben > ** class submarine, ref.: > ** http://lab.artematrix.org/submarine/images/project/IMG_0224.jpg > ** > ** and here one from U 995 (type VII C) in Kiel (Laboe), ref: > ** http://lab.artematrix.org/submarine/images/project/IMG_0209.jpg > ** > ** If you decide to make one then let me know as I have made a little program > ** that calculates the offsets needed to space out the scale correctly, i.e. > ** according to how you physically size your own gauge (ID of glass tubing, > ** length of scale, start air volume, etc). I also have a few sketches on how > ** to make the various parts, and how to assemble, plus some ideas on how to > ** test and calibrate the final thing when installed in your boat. > ** > ** regards, > ** Jens > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. Your email address appears in our database > because either you, or someone you know, requested you receive messages > from our organization. > > If you want to be removed from this mailing list simply click on the > link below or send a blank email message to: > removeme-personal_submersibles@psubs.org > > Removal of your email address from this mailing list occurs by an > automated process and should be complete within five minutes of > our server receiving your request. > > PSUBS.ORG > PO Box 53 > Weare, NH 03281 > 603-529-1100 > ************************************************************************ > ************************************************************************ > ************************************************************************ > See how Windows Mobile brings your life together—at home, work, or on the go. See Now |