Ok, SO after resigning this boat in the attic for a while, and managing to complete one build out of the way, its now to "rethink" the powerplant on this hull.
YES, brushless are now in the running and will be looking for a "twin motor" setup, if any of you have suggestions for suitable motors. A couple of people have already suggested going for outrunners rather than in runners and simply using a water cooled motor mount.
I have 7.4, 11.1and 14.8v lipo batteries available, as I now run these batteries in 90% of my boats, all rated between 25 and 30c.
So what size/rating motors does anyone recommend and also prop size/type. the hull already has twin M4 solid shafts in situ.