Bryan wrote:
”
I have built a rudder for it
in wood, but it seems to blocky to me?
Was thinking of using aluminum
instead. Any ideas? What about aluminum lee boards? Instead of wood.
Any input would be a help.”
As usual it is better to have one big leeboard, than two small!
Making a high aspect ratio leeboard is the ticket to success, and if
you do that in aluminium you’ll get yourself a fairly heavy leeboard,
as a thin plate will definitely flutter and bend. You could make it from
a thin piece of aluminium, wrapped around a well designed hydrofoil,
made of stiff foam, but that is tricky and a bit complex!
A successful foil should be around 12% thick, at the thickest,
which usually is about 30% from the leading edge! NACA 0012 is a
classic foil, to mention one!
An aluminium rudder works better, as it is of lower aspect - one that
is a foot square would work well, in most cases. But the sheet has to
be around 1/4″ to be stiff enough - I used 4 mm, but has to add
external bracing!
Tord
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