Subject: RE: : Re: : Re: : Re: : Re: : Re: : Re: [harryproa] Re:: Diesel Electric Drive
From: "'Peter Southwood' peter.southwood@telkomsa.net [harryproa]"
Date: 3/21/2015, 9:54 AM
To: <harryproa@yahoogroups.com.au>
Reply-to:
harryproa@yahoogroups.com.au

 

Whoever you are,

1.       We consider it civil to identify yourself by signing your posts

2.       Your misunderstanding of ship hydrodynamics appears to be deep. In spite of  Rick and others remaining polite and explaining their points both accurately and in detail, using the standard meanings for naval architectural terminology, you persist in misinterpreting their responses to the extent that I am beginning to suspect trolling.

3.       You claim some background in aerodynamics and seem to think this can be applied without further investigation to a very different field of fluid mechanics. The people you are dismissing are knowledgeable in their field, can you produce any evidence that you are educated in fluid dynamics, so we can be persuaded to continue to take you seriously?

4.       A submerged bulbous bow and narrow hull are normal  characteristics of a high speed displacement hull. Any similarity to a submarine hull is because they are both designed to work at high speed in a displacement mode, whether at the surface or submerged. Furthermore a Swath type hull would have a reduced waterplane area (by definition – look it up) which this does not have  beyond the consequences  of a generally slender hull. A submarine’s hull would also commonly have a smaller length to beam ratio to minimise surface area, for the given displacement.

Cheers,

Peter

 

From: harryproa@yahoogroups.com.au [mailto:harryproa@yahoogroups.com.au]
Sent: 21 March 2015 02:49 PM
To: harryproa@yahoogroups.com.au
Subject: Re:: Re: : Re: : Re: : Re: : Re: : Re: [harryproa] Re:: Diesel Electric Drive

 

 

Rick,

 

 Please point to the boat that has a displacement hull speed of 40 knots.
I already have - the LCS Independence:

http://gandoza.gandoza.netdna-cdn.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/u/s/uss-independence-lcs-2-trimaran-ship-_14_.jpg

 

Funny I see a submerged bulbous bow, swath type hull that is explicitly trying to mimic a submarines hull.  No wonder you are confused.

 

**************

This is all  gibberish - 

Dynamic lift by definition is the force created by virtue of the speed of an object through a fluid medium:

 

Let me try a thought experiment with you. If you are 'motionless' in an elevator how do you determine whether the elevator is resting on the ground, hanging by a wire, supported by a spring, floating on a pond, sailing across the pond, flying in the air or accelerating through space at 9.8 meters a second squared without looking out of the elevator?

 

You can't, because Force = Force.  F=MA, it makes no distinction whether the force is coming from displacement, or a spring, or gravity, or an engine. That was Newton's genius.

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Posted by: "Peter Southwood" <peter.southwood@telkomsa.net>
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