Re: [PSUBS-MAILIST] Submerged speed calc

[MerlinSub@t-online.de]

I drive Kraka (together with Peter) that way. On periskop deep you can hold the deep just with the engine - more speed up - less speed down. A the right speed she stays on periskop run for really long time without the need of handling of the pilot. Realy nice. 

regards Carsten

"Paul Kreemer" <paulkreemer@gmail.com> schrieb:
> A couple of years ago Peter Madsen wrote about Kraka and her snorkeling
> performance.  His comments:
> 
> ...the primery problem that hits a classic shape during high underwater
> speed is a "nose up" tendency. Kraka has a hull that has this tendency since
> most of the drag inducing superstructure is above the center of thrust,
> causing a rising torque as uw speed increases. At some 6 knots the boat (
> expected ) goes out control, since at this speed the dive planes are 15
> degrees down - yet the boat still rises. That is the limit of the design.
> 
> Great that Kraka just rises for him when going out of control.  At the time
> he seemed to really like running on snorkel and was getting into work on his
> UC3 boat which has a modern shape more optimized for submerged speed.
> http://www.bluesky-services.dk/submarine/pages/page_050_uk.html
> 
> 
> take care-
> Paul
> 





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