Re: Fin shapes

Ad Brandt wrote: 
J Flory wrote:

- stability - a less stable hull may require a skeg with a greater
stabilizing effect on lateral roll, again depending on the designer's
expectation of the users' skill levels
-  the hull's intrinsic tracking ability - a hull with a deeper bow
(Filippi, Hudson, Empacher) may naturally track straighter than one
with more rocker (van Dusen, Resolute) and hence a smaller skeg may



Slightly off-topic, but now that you mention hull shape, I'd like to ask this question:
what's the advantage of rocker, ie the bow coming out of the water for something like half a metre of length when the rower is in the catch position? This half metre seems useless at that point and thus dead weight, and just before the catch when the boat speed is at its maximum, you probably need all the waterline length you could get! Isn't that the reason that modern sailing yachts have completely abandoned rocker and have these straight, perpendicular bows?

~Ad
Just thought of a reason why you want rocker on a shell's bow: when you move towards the bows during your stroke, the CG moves forward, the bows move down into the water. However, a bow with rocker will increase submerged volume forward, and therefore pitch less.
.

Relevant Pages

  • Re: Fin shapes
    ... the hull's intrinsic tracking ability - a hull with a deeper bow may naturally track straighter than one with more rocker and hence a smaller skeg may ... Slightly off-topic, but now that you mention hull shape, I'd like to ask this question: ... This half metre seems useless at that point and thus dead weight, and just before the catch when the boat speed is at its maximum, you probably need all the waterline length you could get! ...
    (rec.sport.rowing)
  • Re: Fin shapes
    ... the hull's intrinsic tracking ability - a hull with a deeper bow may naturally track straighter than one with more rocker and hence a smaller skeg may ... Slightly off-topic, but now that you mention hull shape, I'd like to ask this question: ... This half metre seems useless at that point and thus dead weight, and just before the catch when the boat speed is at its maximum, you probably need all the waterline length you could get! ...
    (rec.sport.rowing)
  • Re: Fin shapes
    ... the hull's intrinsic tracking ability - a hull with a deeper bow may naturally track straighter than one with more rocker and hence a smaller skeg may ... Slightly off-topic, but now that you mention hull shape, I'd like to ask this question: ... And as waterline length increases speed, the bow is designed to be perpendicular. ...
    (rec.sport.rowing)
  • Re: jointing problem - rocker on long edges
    ... Once I have some rocker in the edge, ... >off a tremendous amount of wood to get back to flat. ... I'm not sure if I understand the "bow side down". ... running in the correct direction after you've made the piece straight. ...
    (rec.woodworking)
  • Re: [OT] Navy releases photos of U.S.S. San Francisco
    ... pairs outboard of the guy walking at the bow) are rigged out is further ... The pressure hull forms the visible outer hull of the boat right up to about ... forward from the elliptical bulkhead on a "stalk", ...
    (sci.space.history)