Steering boards, of all models when sailing are set to have 0 DEGREE AOA. Model should sail with hands of stick in a straight line on all most all courses once under way.
The steering boards on this model were 7''l x 1 3/4''w , 4'' sat below waterline. I cut 1'' off each board for a now 3'' below waterline. Funny thing with this model its producing lots of weather. Model does not have a neutral helm . First I thought it was the added weight , 4oz to sit on deepest waterline for maximum displacement designed on windward hull. So I took out 2 oz and tried same thing no neutral helm there was a difference but not significant. So took out the other 2 oz's still no neutral helm and winds were decreases even yet should have helped. So with all weight out added a lump of sand to designed maximum displacement for leeward hull and it help but again not by much and slowed the model down. The maximum displacement for leeward hull is more for active sailing loads not static loads. Its an anticipated maximum sailing heel force of what the under water plane will look like.
The model did show a higher turning into the wind tendency than other models but with the longer boards always had a positive steering at slow speed and once under way a neutral helm.
I'm thinking rockers wrong on windward hull, not enough rocker. Or leeward hull has to much rocker. Either way as they are, are a miss.
Oh yeah lots of leeward hull bottom bow slap in moderate chop ouch...It was making an actual audible sound.
--- In harryproa@yahoogroups.com.au, "tsstproa" <tsstproa@...> wrote:
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> Did a new model with rockered 36'' hull 36' in real life and a 24'' both have identical rocker curve and are 4'' or 4' tall at center. If you were to place each hull next to one another on a flat surface the windward hull follows the rocker contour of the leeward giving the windward hull, the shorter hull, taller stems. Both hulls are connected to were they sit level on with both keels touching flat table top.
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> This gives roughly a 1'' lift in keel bows on leeward hull and a 1/2'' lift in keel bows of windward hull.
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> Hull Designed to sit on a 8 - 12'' waterline on leeward hull and 6-10'' waterline leeward. Scale model would be 3/4 -1'' and 1/2 -3/4 inch roughly.
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> So far I'm not convinced that this set up is the best. It seems that the windward hull is pushing more water. Seeing the bow wave is higher and more predominate than the leeward hull when sailing.
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> Comparing to what I have in existing tests of rock no rocker hulls the no rocker seems to be better in someways, not all mind you, but better in what I'm looking for.
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