Okay then, before anyone else says it (Bill) my SIB carries quite a bit of weight when I'm onboard!
Yes, I go out when it's quite choppy. I hang on to the rope attached to the front and have a crew member sat in the nose. This helps to keep the boat stable and as a welcome by product deflects a lot of the spray off me
(see article in RI). Now I am not as cruel as it may seem (oh yes?) as I have now brought my crew drysuits (thanks to the chaps who sold them to me - Noel is now known a Bananaman JK).
I am hanging onto the engine with one hand and the rope attached to the front with the other. In fact I saw the Australian lifeguards doing this in their SIBs, which are only about as big as mine. I sit on the right (sorry Starboard) tube. If it gets really jumpy I kneel inside. Quite comfortable with an 'airdeck'.
I look upon sibbing as a 'watersport', like waterskiing, ie. getting wet (on the outside) is a part of the fun. Quicksilver is a wet boat.
I pay attention to the wind and tide and plan my trips to start off against the wind (the more diffiult to make headway) and come back with the wind. This way I always know that if it took me a hour to get 'out' I will most likely be quicker getting back. I also keep myself aware of any intermediate possible landfalls.
I always try to keep the waves head on as it can be a tad 'hairy' with them on the beam.
In a choppy sea I do not try to make quick progress. I go for steady and careful progress as I know that my little SIB can not 'fly' over the larger waves.
The boat is VERY buoyant (!) and even when there is loads of H2O sloshing about it does not seem to make much difference. Until you come to lift it out of the water that is!
A couple of times I thought that I had mysteriously lost all my strength and was hardly able to lift the boat out, only to find that there was about 20 gallons of water in the bottom. There is a one way drain hole but is is very small and it takes quite a while to drain the water out.
I suppose you could flip any boat given the right (wrong) circumstances. Certainly the c of g of Quicksilver is very low.
Keith (Pentland Firth here we come) Hart