I built this over 5 years ago , it has 5 min run time on 4s 10,000 mah with a 1515 2200kv. I had many many runs with it . It's a T29 with a custom inline rudder spinning a 440 3b. If the setup works in a mono then it should be twice as reliable if you did two of them in those bullets your building. I'm only speaking from my personal experience and wouldn't hesitate to drop in some faster motors. 
Video with cheap lipo , high 40 mph
Video after I sold the boat to a friend with better lipo's , 53 mph !

Video with cheap lipo , high 40 mph
Video after I sold the boat to a friend with better lipo's , 53 mph !
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