Originally Posted by Polwart
I just did a back of envelope calculation:
25 cm radius tubes, 6 m long on each side of a boat is about 2,350,000 cm3 of gas.
With air - this weighs roughly three and a half kilos. Helium therefore can save you no more than 3 kg! Even if you could keep it in your tubes.
OK so the whole idea was silly but if I hadn't asked I would never have known the answer
Pete7, less pies for me, correctly noted - I am a fat barsteward
I'll get to 40kt yet
Next question is whether or not if I bounce up and down on the jockey seat, whether the intermittent weight saving of [something over 100kg actual figure strictly classified] would get that last knot