That sounds like a nice solution. Lots of carbon, no worries
about crevice corrosion on a smaller pin, plenty of clearance, and
the all-important kick-up. It will be great to see.
- Mike
Rob Denney wrote:
I have not done the numbers, but the answer is not much weight or cost. Probably less than the weight of the beam mounted rudder which was pretty heavy for a variety of reasons. On my Sol (single beam), the rudder is mounted on a 100mm/4" dia fibreglass stub beam which sits on the deck, which I think is a better solution than the horizontal flanges as it allows the rudder to kick up in both directions, and a shaft rudder to be used. Also allows it to be supported fore and aft.
rob
On Fri, Sep 16, 2011 at 10:51 PM, Mike Crawford <mcrawf@nuomo.com> wrote:
<<If this was raised, the loads go up, so the spray is a tradeoff with strength and weight. >>This brings up a question that's been brewing in my mind for a little while now: very roughly, how much weight and expense would this involve when raising the rudder box up, say, half a meter?
Is it another $100 of carbon and 5 kg per rudder? Another $500 and 10 kg per rudder? Is the issue not as much in reinforcing the rudder as in reinforcing the attachment point?
I'm just curious. I know that increasing the height increases the forces, which increases expense and weight. I'm just trying to get a ballpark feel for how much. Perhaps visionarry-strength rudders and supports on a harry-size proa wouldn't be that bad. Or maybe it's worse than that.
- Mike