Andyn will prob know my motor looking at his avatar! Its an align 500 heli motor, 1620kv (if my memory is right), thanks HS93 for posting info.
Unfortunately, brushless info on a large scale boat like this is non existant. We spent a long time trawling loads of forums for info, and it all came down to trial and error. I can confirn that water cooled on 6 cells (most recent video) all was very mildly warm, but, I couldnt get a long run in, lake was too small, and it was a very cold day.
The problems with brushless start when the motor stops, and the water cooling stops, they dissipate heat at the front, so we are going to have to make a water cooled motor mount, or at least have a water cooling pump system when boat has stopped to cool the motor. Last time out, when stopped, 5 mins later motor was hotter then when running.
An out runner could cause problems, as you will not be able to run a water jacket or cooling coil on it, and there is always the danger of something getting fouled in the very fast spinning can. I also use a 2:1 gear ratio, 50 mm 2 blade prop, about to fit a modified 52.5mm prop. Standard 52.5mm was too much load, so I have trimmmed the trailing edge of the blades which will lessen the load, but keep the larger dimemsion, I hope!
Unfortunately, the answers will not come from this forum as its not really been done, its easy to guess or estimate what performance will be like, but seeing it in operation is the only proof, Ive said it before though, the lipos are a pain, need looking after too much and are a bit of a worry, exactly the same problem is happening with a small brushless jetboat project we are toying with.
With regard to the models, 31 is the aft cabin, mine is the 28, Huntress is shorter than the 28 (Made famous by James Bond in From Russia With Love), google fairey owner club, loads of info and nice pics there, I got most of my cosmetic info here
