Hi Rolf
I used the term "drag" in the post above and this probably isn't strictly correct. Wind resistance could have been more accurate. How this ex World Champ, Engineer and Foil manufacturer amongst other things came up with 3kgs is beyond my comprehension but I still have no reason to doubt him. However, I have yet to amend the angle of my snuffer mouth to reduce wind resistance but that doesn't mean to say it wont stay on my 'to do list'.
Every time I look at my avatar photo it reminds me