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Inherently beautiful.
ubject: Inherently beautiful.
From: (Thom Stewart) Date: 10/23/2003 14:25 Pacific Standard Time Message-id: Shen, You're way off about two bladed and folding. I have a single prop mono hull and I use both a fixed Martec and at times a Martec Folding, Both 13x13. They both walk. The Folding much worst than the fixed, due the the need of higher RPM's initially to open the blades. You may very well be right, but for your application, not his, or possibly, also his. BG I have no experience in that area (folding props) and have said so, but there are other points he has brought up, that make me think "prop walk", in his case, is not a serious maneuvering factor ( don't know why, but think the folding prop/pitch/efficiency may be inclusive as a factor). If nothing else, I'm getting the sense that we need to throw out preconcieved notions of twin screw boat handling, when discussing "cats" in general and Jeff's in particular. Jeff I don't have the answer of why you don't walk but I would suspect it has to do with the Saildrives. Walking occurs on bare props. The Saildrives have cavition plate and shaped housing forward and shedges below which control the water flow to aid forward and stern direction Can't agree with this, since I feel "propwalk" happens AT the prop and is not related to G appertenances surrounding it (though they might have a very slight effect on end results) You, my friend, are BLESSED with a vessel that goes forward and back in a straight line. Give thanks!! "I'LL DRINK TO THAT!" Ole Thom As an addendum to your other post to Mooron (I believe) in the twin screw world, there are three setups: twin screw both same rotation - to be avoided at all cost (Jeff's exception noted and reason for many of my questions). Twin screw, inboard turning - a favorite of many "Supplyboats" and the Navy - has it's advantages, but not my overall favorite. Twin screw, outboard turning - what you'll find on the majority of twin screw boats and my overall favorite. Shen |
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