First, terminology. How many volts are you running to the motor? 4S (14.8 volts) is a bit low for that size motor. What capacity is each pack, 6P (6 packs) is a lot of capacity.
What speed did the boat achieve with your son in the boat? What speed do you want? I am assuming that the boat with boy will weigh well over 50 pounds, and IMO that is a lot for a single hobby-grade motor with a submerged drive. TP is a good brand and they make larger motors with lower Kv values - but you are outside the experience zone of most on this site. Hopefully another member with actual experience will step up.
It sounds like a great project and I hope you get it to work for you. Here is how to post pictures, it really isn?t too difficult.
https://forums.offshoreelectrics.com...highlight=Post
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