little update, after a miserable winter with this boat, having a number of problems, which were esc settings, I decided to give it a treat with some Xmas gift money.
My other big fast boat runs two 5000mah 3 cell lipos, and I only have one set, so run the boat then have to wait over an hour for batts to recharge, so decided to buy another set, and...... can use them with the fireboat, running 5 cells per motor instead of 4 😀 . The lipos I use in the Fireboat are now 5 yrs old, and are real cheap brand, so are struggling a bit going off charge quite quickly.

Modifications are now needed to the battery tray! these are big ass batteries, more weight 😯

I had to move the battery tray back a bit, its getting a bit snug in there!

Today I had a run with the new batteries, and It was a great success. I wasn't after more speed, although I couldn't help myself seeing how fast It would go, but wanted more efficiency, which didn't happen as I went too fast, and better run time.
When you have a big lake all to yourself on a sunny bank holiday morning, you just got to open It up. Data logging was on board, so with 5 cells per motor, almost 20 mins going fast most of the time, I recorded 25.3mph which Is stupid speed for this boat as It Is so heavy now and a whopping 939watts, 51.82 amps, which are maximum spikes.

On a smaller lake It would last a lot longer, but I like speed! 😀

cant believe this was 6 years ago, I sold the boat a year ago to fund other RC Projects, but you know when something leaves your manshed, and the very next day you regret it!

Hopefully its getting use from the new owner, as it was sitting in the box in my possession, which was a shame☹️