Hello Skegness..I am using 2 E-Max GT2820/7 brushless Motors. These Are UK purchased from BRC Hobbies (based Northolt) Cost £20.95 each.. these are 850 KV..using Twin Mystery RC 70A Forward Backward 2-7s Brushless ESC (with Ubecc) about £20 or less on EBay (HK).

Run Time..1 Hour, mix of fast and slow Sailing..Depends on use.
Using 2 X 7.2 NMH Volt Battery Packs..at 5000mah each.

She Goes Like fast, and cuts through water lovely.
Have A Similar Setup (Different Emax Motors) in my Models By Design interceptor 42 Boat (42 inch length)..Tooo Fast for me..lol..Any Other info PM me for phone number..Happy Sailing

E-Max Number is GT2820/07..sorry about my error