Cruising Sailors Forum Archive
I have agreed with you that mathematically, the rudders see different forces at different times
In Response To: Even if you don't turn, the rudders see different forces, Mark ()
That is true of two of anything immersed. But I don't understand your point of sussing out all the small details of inequality that may transiently exist in dynamic operations.
If it is just a thought exercise, then OK, but if it is to support the notion that those rudder surface areas are too small, then I call BS and have listed logical and experimental reasons for that - not just mental wanderings.
The delta of forces and dynamics experienced by two different rudders on a catamaran are nothing like those experienced by two different skis on a double fault mogul field. That simile is just absurd to the extreme.
Mark
Messages In This Thread
- Catamaran abandoned 300 miles off Norfolk...
- “The rudder had somehow been bent,” he said. “It was useless.”
- I hope I never
- Just watched the CG video. Now I got even more questions..
- More from the Alpha website.
- Tarjan is a master of spin
- Can't go by
- A fertile field for critics. Here's the account from Doane....
- refreshing to have somebody reporting from the bilge when one of these boats is abandoned.
- Charlie replies to the sailing forums Peanut Gallery...
- As usual, an excellent, measured analysis from John Harries...
- refreshing to have somebody reporting from the bilge when one of these boats is abandoned.
- The definition of "massive"....
- I don't think it was cutting corners
- Forces only increase in reality not in direct proportion to change of weight, speed, area, etc in direct proportion
- I very much think it was cutting corners...
- I don't think it was cutting corners
- I'd put 1 1/2" on a 28'er.
- I know both Hank and Charlie and I have one question for them . . .
- I think Hank and Charlie would argue with you that they were not in the Atlantic in February...
- Exactly...
- Your unexamined beliefs are showing, Jon
- What are you sailing, Mark?
- A Manta 40
- You're making the wrong generalizations
- I dunno
- Well you are right about that...
- I dunno
- "Unexamined", perhaps - but not necessarily unobserved...(grin)
- What are you sailing, Mark?
- Your unexamined beliefs are showing, Jon
- if there was ever a case for the owner picking up the rescue bill, this is it.
- I think Hank and Charlie would argue with you that they were not in the Atlantic in February...
- Charlie Doane posted an excelelnt account of the abandonment at
- I would have thought that the boat could have been sailed
- Now, after all this talk...
- I have the price list
- Well those are tiny little rudders, surprised they noticed them missing...
- The rudder size is not unusually small at all
- Agreed
- Two of them -- I wonder about that...
- forereaching depends on sail balance
- They aren't evenly loaded.
- I still don't see the point
- Even if you don't turn, the rudders see different forces, Mark
- I have agreed with you that mathematically, the rudders see different forces at different times
- Even if you don't turn, the rudders see different forces, Mark
- I still don't see the point
- They aren't evenly loaded.
- forereaching depends on sail balance
- Agreed
- Here is a monohull example
- Those rudders are a compromise required by shallow draft. Nevertheless, the Alpha rudders were under bui
- Of course it is a compromise
- So I have become more interested in this shaft diameter thing
- Can't sit still any longer...
- Many monohull spade rudder shafts are seriously undersized.
- Mark, do you know another Manta 40 owner on Doublewide
- Yes, I know Doublewide well
- Yes, I know Doublewide well
- Those rudders are a compromise required by shallow draft. Nevertheless, the Alpha rudders were under bui
- The rudder size is not unusually small at all
- “The rudder had somehow been bent,” he said. “It was useless.”
