RE: [Paddlewise] Topic Carving.

Hi Peter,

The propeller sits under the front hull, facing the front of the boat, and 
can be impulsed with a pedal system to give forward momentum. It can also 
be rotated with a handlebar, so that the impulse is not always forward but 
It can be to the right or to the left, and you give it more turn, the more 
balance you need to recover or the sharper turn you want to make.

But the experiments were done without propeller or anything under the 
water. Just the round tube, with the pencil sharpened ends (that end 
exactly at the axis of the rounded tube), and then the wings simulating  a 
dish (more precisely two ellipses), one on each side, staying above the 
water when balanced.

By the way, the axis of the tube is more or less at water level, so that 
any leaning gives the same shape to the water. So no carving or turning 
occurs due to the tube itself. It is the wing that brings new consequences 
to the system, when it goes into the water due to leaning. If  you lean to 
the right and the wing enters the water on the right side, the boat 
turns  to the left, just like in a kayak if you lift your left knee.

I´ll send you a picture to your personal mail, since this device is not jet 
in our web page.

Best Regards,

Rafael.
www.mayanseas.com




t 08:09 p.m. 07/12/01 +1100, PeterO wrote:
>Rafael wrote:
>SNIP
> >It is a rounded hull with no sharp bow or stern like
> >in a kayak, the rounded cross section diminishes as
> >the hull goes to the ends. This hull stays balanced
> >using a propeller placed way up front. When in motion
> >as you lean and turn the propeller, you restore balance
> >moving in a new direction just like in a ground bicycle.
>SNIP
> >WE THOUGHT THAT the wing would place resistance in the
> >water and the boat would turn in that direction. We set
> >up the experiment and we found out that the turning, very
> >slight, is in the opposite direction just like a kayak
> >when you lean. That is if I lean to the right side and the
> >right wing touches the water, the boat turns to the left.
> >Just the same as if I was raising my left knee in a kayak.
>
>G'Day Rafael,
>
>If I've understood correctly the axis of the propellor is at right angles to
>the length of the boat like a bicycle not like the prop on a plane! Does it
>matter which direction you turn the propellor? Is the lean turn a coriolis
>effect? Also are the points at bow and stern on the axis (coaxial) with the
>tubular hull? Would love to see pictures of this. Certainly food for
>thought - thanks!!
>
>All the best, PeterO


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