[PSUBS-MAILIST] drug-sub and how to snorkel

["Jens Laland" <laland@artematrix.org>]

Ian & Mark

To maintain proper depth and trim during snorkeling ('diesel trim'), you
would be very wise to use a Papenberger and a Trim Indicator.

The first image shows such instruments as they are still used today, and
the second image is from a German WWII u-boat type VII.

http://traktoria.org/files/instrumentation/papenberg_and_trimmzeiger/papenberg_und_trimmzeiger_uboot_typ212_youtube1.jpg

http://traktoria.org/files/instrumentation/papenberg_and_trimmzeiger/U995.jpg

Best regards,
Jens Laland

** On 2/16/2011 4:56 PM, irox wrote:
**
**> To make it more stealthy than the surface boats they will require
**> accurate depth keeping.  Come up a few feet too much and you
**> present a taller radar target than the decks awash boats, a few feet
**> to low and you are starving the diesels (and crew) of air.
**
** Not a big problem in a sub designed with that in mind. A lot of the
** problems that u-boats retrofitted late in war with snorkels had was due
** to the fact that their hulls were optimized for surface operation.





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