Originally Posted by codprawn
I would have thought most offshore/racing powerboats would use similar arangements.
The only real danger is if you are knocked out when you flip but a crash helmet would prevent that.
Obviously you would need to be seated for this but most smaller racing powerboats use seats - not bolsters. In fact looking at typical RIBs it seams their CG is way too high.
Harnesses are only allowed on canopy boats - all open race boats cannot have harnesses fitted. Canopy boats are also required to have seperate air supplies for both of the crew and many are removable when you exit the boat you can take your air supply with you.
There is also a requirement to practice being turned over in a swimming pool with blacked out goggles on before you can race in a canopy boat (a "dunk test").
Even in the race ribs with rally / race seats crews can get thrown out if the boats hook violently enough, but there again I have seen batboats and others eject thier crew as well!