KARO performing

Today the wind seemed strong enough for a C-rigg party, sadly it wasn't strong enough so b rigg and  later a rigg were sailed.
I took the black boat to the pond, this is SLO 03 the boat i will be sailing at le Havre in 4 days.
My girlfriend was escorting me, taking pictures and sunbathing.
Anyway here are the clips:
B-rigg

A-rigg

overpowered a rigg

On the last clip the boat was seriously overpowered but the tip of the long rudder remains in the water to provide enough control.
I really like how the boat sails upwind when heeled. It is very well balanced, going over the waves in a steadily oscilating motion combined with responsive rudder control, the boat gives a reliable feel and very fine corrections are possible. Other than that it goes upwind more or less neutral, but still "reading" the gusts.
Tacks are super snappy, but can be also slow, carrying the speed trough.
photos:

To sum up the photos,
1. it seems that the vertical downforce created by the sails is very large for footys, as the boat goes sort of submarine upwind. Spade the old model suffered of this phenomena greatly, and even KARO with lots of reserve volume seems to get pushed down by the sails. But making up the needed extra volume would be irracional as the hull would get somehow to big.
2. The boat still has no bow bumper.
3. Sailing upwind the bow picks up water(photos 3, 4). That is uneccessary, for the future developments a , chine or perhaps a deflector should be introduced, such a device has to be located as close to the waterline as posibble, not to increase the air drag(note: the wave drag should be taken into acount)
4. Sailing downwind, a huge depression is created when the bow is pushed into the water(can be seen on older posts). This depression is no good for drag. My thoughts are to narrow the bow, but that would mean taking away lots of necessary volume. I guess a depron prototype is the way to try out a narrow bow.

BUT, in footys we have an unlimited supply of power(sail area is not restricted) the challange is to deliver that power to the hull in a proper way.

An una-rigg is definetly not the way.(although it brings the boat up to hullspeed, it can't surpass it)

It has a big forward force component, high above the deck, which results in a big leaver pushing the bow down(sort of rotating the boat).
I tried 200g ballasts in the stern and it won't help(ofcourse not the sail force must be bigger, and a simple calculation proves that) the best trick is to add a lot of volume in the front(like british ice, ant, supabug footys), or devise a high piercing bow(like sui 42 "BOX", or "breithorn" and karo), it's also much easier to add 200cm3 of volume to the hull, than to put 200 extra grams on a boat that has to be balanced.

British ices run a very thin mast wich bends alot(even downwind) depowering the sails. but the rotating force remains.
The una riggs are a good compromise for upwind performance, as they provide little drag, the mast bends to depower the sail.

The future riggs are delta and classic riggs, if enough lift can be gotten. The challange will be creating more lift, than drive, and being able to have sails that will be able to produce enough drive for upwind sailing.

There is still much more to say about the riggs. Maybe more next time.