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Passing thought

August 31 2005 at 3:42 PM
Tom  (Select Login Flt-tech)


Response to A new wave of thought

The thrust line of the ship is important for economy reasons. On the NSWC website they have a study done on Perry class frigates where a wedge is placed under the stern to help lift it and a 3% savings in fuel use is realized, with an investment of about $20k.

After I posted the answer last night I got to thinking(DANGERIOUS!)that maybe the reason for the variable pitch screws on the Post war "T's" may have been done to add a lifting force to the stern when backing off the beach. The rotation of the screws doesn't change but the bite does, and from what I have read about retracting, every little thing helps.

In reading about the German E-Boats(they had displacement hulls) they had a wedge under the stern for lift. Also if memory serves me. The picture posted some time last year here of an E-Boat, is one of the boats that particpated in the Slapton Sands Incident.

Flt-tech

 
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