Scarlattikvarten differs from the original Spyder design in a number of ways. Some changes were made when we built the boats and others have been introduced over the years. The following table is a summary of all this.

Major changes and some other 'progress':

When What Why
1986 Stretched hull aft-body Longer and straighter run.
Simplified cockpits Better ergonomics and shorter building time.
Dolphin and seagull strikers. Simpler and stronger.
Aluminum mast No time to build wing and lighter
Ackermann tiller geometry We though this is the way to do it.
1987 Balanced rudders Ease of helming.
1989 New cross-beams and 0.5 m wider. Old beams under-engineered.
1991 1 m higher mast. Got a good deal on a used, higher main.
Assym. spi. on bowsprit. To fit new rig.
1996 Deeper dagger boards. Greed for windward speed.
1998 New aluminium mast. Stronger, lighter, better shape
2004 Dolphin striker replaced by beefed-up laminate on beam. Convenience on trailer and at mooring.

Apart from this I have tinkered quite a bit with main-sheet and other sail controls. Some of this does a surprising difference to how sweet the handling of the boat is. The net effect of all this tinkering and re-engineering is that Scarlattikvarten has gained some 20 kg of all up weight, the up-wind sail area has increase little over 4 sqm and the down-wind area some 10 sqm. The rig is about 1 m higher and the dagger-boards are some 25 cm deeper. Top speed is probably lower but average speed and windward capability is definitely better. Above all she is quite a bit sweeter to sail.

A friend of mine commented some years ago that the only parts left from the original boat were the hulls. I had to point out that the boom, the rudder blades and the engine pod also are from 1986.