Based on works of Cz.Marchaj on crabclaw sail execellent features, published in "Aerodynamics of Sailing", I continued with my own research on this rig but in full scale. It was fruitfull effort.
Gatherd old photos and drawings I've started with model for concept proofing.
Model sailed unattended and once set on tack, followed the wind changes without remote controll in somehow mystic way,
There was no reason to find out myself what makes CrabClaws and proa such marvellous combination.
Full scale vessel allows for accurate sensing what happens, how and why.
One can feel, and react, interactive building and testing hypothesis, adapting the way obsevations are made, where testing models or in aerodynamic tunnel narrows to some features and allways proe to assumptions and simplifiacations made.
I made plans and designed Pjoa based on old drawings, inspired by Harmen's Hielkema "Tora" and adviced by Gary Dierking.
..and where we are now:
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