Hay, welcome to OSE forums. I raced a Sprint way back when too. So of coarse when I got back into RC boats I had to put a nutter one together. I don't race now, ain't a tunnel boat race with in 200 miles of me maybe further. That said, I do want them to fall with in a race class and hopefully be able to make race distance plus competitive speeds none the less, even if its last place lol. I set my Sprint up to meet NAMBA P-Limited class rules. Fuel = a single 4S, 5000mah, 50c lipo, fuel pump Seeking 120 amp ESC. Power HD water proof 23kg servo. Atop my K&B 3.5cc lower sits a AquaCraft 36x56mm 2030/kv motor. Prop, I most always use a sharpened/balanced stainless P-215, I've got my CoG at 7 1/2". With that set up I see a top speed of 46mph(gps), favorite little boat.
disclaimer at that speed and the diminutive size of that little tunnel its a flat water only rocket. Good luck have fun.
PROBOAT BlackJack 24", ShockWave 26"
MRP U-31, 3 tunnels VS1, MRP Bud Light, Dumas HS Sprint
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