Dennis
If you are decided on the hull shapes I can update the VPP with those shapes using your fbm files if you want.
The windage on your beams and diagonals as drawn will cost you 15+% of the sail resolved thrust when going to windward, which is more often than not when you are sailing near wind speed considering the apparent wind. If those flat surfaces clip waves they will really slow you down. You should look at faired shapes like back-to-back wedge beams. Just rotating the main beam 45 degrees will reduce Cd to a fraction of the flat face.
Rick
On 22/08/2010, at 6:43 PM, Dennis Cox wrote:
This is my current thinking... although, I want to re-check my numbers based on Rick's last message about using an aspect ratio of 7 to 8 and see if how much I can reduce the size of the rudders. Since I have no way of doing a non destructive rudder strike, I will be evaluating that some. Its configured to articulate the hulls and I have some ideas to restrict that motion, but they're not in the drawing. Windward hulls been analyzed with Godzilla is about 10% more drag than a semi circle cross section... again... hopefully, can get it planing early and overcome that deficiency. Can always sit on back of windward hull (with the articulation) raise the nose to encourage planing. With the big flat bottom, expect it won't be too difficult. Although it will be a bumpy ride!
Rick Willoughby
03 9796 2415
0419 104 821
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