Howdy!
A diving colleague of mine sent me the link to your posts and I thought I might answer a couple of points.
My name is Heath Samples, the chap who came up with the idea and applied to Guinness World Records to have the new category set up of The Fastest Crossing of the English Channel on Sea Scooters.
I am also one of the four "Muscooteers" completing the World Record Channel Challenge as we have now called it- marketing eh??!
We are using SEADOO Supercharged RS Seascooters and with the tidal effect in the channel and drag by the equipment we are carrying, expect to cross in anything between 8- 12 hours.
Changeovers shouldn't take too much time as they will be "live" i.e. the team replacing the sub sea pair will fall in behind and move up to the existing pair to maintain a continual track over the channel.
That pair will then peel off and go to the Muscooteer Support boat. There are four support boats with 18 crew in total on board.
The biggest challenge is avoiding shipping as at 5m depth, we ain't going under anything so time will also be dependent on complying with International Maritime Orders (IMO) for the region and also protocol of crossing the channel shipping lanes (90'degrees etc)
There is more information on what we are doing on the club website
Scarborough Sub Aqua Club and also search Facebook "World Record Channel Challenge.
Thanks for taking an interest and please spread the word with your other diving buddies.
We are raising money for Help for Heroes and the RNLI/ Scarborough Lifeboat so all exposure welcome!
Best
Heath