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Thread: rudder alignment Q
03-10-11, 15:56 #21
03-10-11, 16:31 #22
03-10-11, 17:54 #23
03-10-11, 18:48 #24Registered User
Location : Somerset
- Join Date
- Feb 2008
These guys knew exactly how to position their craft in order to use the laminar flow to keep vessels apart, get it wrong and they ended up being sucked together and possibly damaged with risk of being left behind when **** hit the fan.
03-10-11, 18:50 #25
I may be barking up the wrong tree but wouldn't "toeing in" your rudders cause unnecessary drag ?
03-10-11, 20:31 #26
As soon as I get rid of the 20K euro cash I'm carrying in my pockets all day I'd consider the sale done. Hopefully tomorrow before lunch, so I could accept early congratulations, thanks!
I'll then update and close officially the original thread, many more threads to come full of questions and photos of the rebuilt over the winter, no doubt.
03-10-11, 20:37 #27
Up to a point I was following this thread nicely assuming that toe in means that the rear side of the rudders is pointing inwards (option A).
Now after jfm and others final contributions, it seems that toe-in means that rear of the rudders is pointing outwards (so front of the rudders is toed in so to speak) as the wake is created on the sides of the hull.
i.e. port rudder alone would turn craft to port, and sbrd rudder alone turn to sbrd.
So, did I get it right this time? (fwiw, mine are on option A atm)
03-10-11, 22:01 #28
Anyway, the fact that in your boat they're currently toed-out (assuming that nobody messed with them) is the best proof that there's no strict rule on this.
In your boots, I'd follow LS1 suggestion to find out the most neutral position empirically.
03-10-11, 22:38 #29
Otoh, following the same reasoning, I actually would expect the water flow behind the props not only to eliminate the V hull component, but to actually create (on average) an opposite effect.
In fact, within the overall water flow pushed backward by the props, there are obviously multiple components going in all trasversal directions at 360°.
But since the lower half of the prop is more effective than the upper half, on average the flow moving inward (towards the keel) is bound to be higher than the opposite flow. Just think of the rooster tail shape: it's clear that the water flow goes from the sides towards the center, not the other way round...
03-10-11, 23:10 #30
Yup, could be right, I see your logic. I really dont know!
To V, yes "option A" is "toe out"!