i saw the windsurfing touring blog with the purpose built hollow board for storage and i noticed that when touring they could only carry one sail size & i thought a variable sail size would give these boards a far greater use .The idea would be to utilise the boom travel and say 3 sizes out of 1 sail that's all i say as far as design goes say for touring eg 10mt 8mt 6mt looks good on paper i think i have overcome all problems without having built 1 of course . i realise that some but not that much performance would be lost to specific design size sails as we have now but i thought that would be offset because of the lower performance of a touring board anyway so would there be a market should i make one or just have enjoyed the challenge of designing it .i have never made a sail and would require a person with these skills to make my design & i imagine that would not be cheap to see a prototype through i dont even know if this has been done before or not any feedback would be fantastic thanks max