I have not seen the speed table before but I can offer my experience.. At
15 knots true wind speed, with the standard genoa and a full main ( I've
never used my spinnaker ) , the speeds quoted in the table are pretty close
to what I've measured on my Vega , On the occasion when I have surfed , the
speed has been well over 6 knots .... measured relative to the water, and
this has been close to a beam reach . I have had similar results at lower
wind speeds with the light genoa. If the sea is a bit lumpy though it is
much slower.. At higher wind speeds I usually reduce sail , the waves are
bigger and steeper ( Straits of Georgia ) and speeds are reduced. The
Designer of the Vega , Per Brohal , reckoned she would travel at over 10
knots downwind with a spinnaker.
As far as stability is concerned I have only the data given in the
handbook which gives the righting moment against the angle of heel.. The
righting moment is usually in ft lbs or kgm .At 45 degrees heel the
righting moment is about 9000ft lbs or 1200 kgm. Sometimes this moment is
divided by the displacement
to give the righting arm , commonly referred to as G-Z , in ft or metres.
I am not familiar with the coefficient.
Cheers,
Tony Craggs , Vega 993 . Chasquis
