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Looks good Dick! I cant see that pitchpoling in a hurry!
If its not blowing it sucks!
<<If it must go, I would prefer it to be toward the side, since a rudder/mainsheet recovery is a <<bit easier than a forward pitchpole.
Maybe, but not nearly as cool to watch.
Kristopher
Looks good but trading off available beam doesn’t seem too good to me; you could use a t-foil on the rudder that in combination with max beam would be much more likely to prevent pitchpole or capsize…Beautifull design!
Doug Lord
microsail.com
monofoiler.com
High Technology Sailing/Racing
I hope you won’t race with the pencil!(ha)
The extra beam adds to speed; speed adds to the effectiveness of the rudder t-foil which ,incidently is the SAME rudder T-foil that prevents pitchpole of a hydrofoil. The advantage of the hydrofoils is that they get the hulls away from the water thereby increasing speed more making the t-foil even more effective.
If you don’t want to use hydrofoils still use the max beam plus a t-foil then add carefully placed “anti-diving planes” to the bow of each ama so that in combination with the t-foil pitchpole is prevented. They aren’t pretty but work pretty(!) well…Giving up beam on a multihull is like selling your soul-shouldn’t be done–and doesn’t have to be.
Doug Lord
microsail.com
monofoiler.com
High Technology Sailing/Racing
T foils on the rudders are unlikely to stop a pitchpole caused by the boat hitting a wave and stopinng, and having a wide boat holding loads of power will just mean the thing goes end’o quicker. As for pitchpoles caused by being overpowered I think the best way is to have a boat with loads of bow volume so it happens slower, giving you a chance to dump some power.
If its not blowing it sucks!
Where can I find A picture of the ( anti-diving planes )
AD foils should be designed for each specific boat as far as setting the bow up angle of the foil; you want it about 5 degrees higher than the pitchpole angle of your boat. On a F48 about 2 X 3" total area on the inboard side of each ama (or on both sides but you could damage other boats).
They should be designed to plane on the bottom surface with a squared off trailing edge.
They are a backup that works and are not a substitute for hydrofoils. Altitude controlled fully submerged hydrofoils give the best speed and best control on small multihulls–in most conditions.
You can see a full size foil designed for Hobie 16’s in the Murrays catalog(murrays.com)(?url). It is not a good design for model…
Doug Lord
microsail.com
monofoiler.com
High Technology Sailing/Racing