The hydroplanes are no kids' toys, reaching speeds of 115km/h down the straights on the open oval racing. One false move and some unexpected wash and they also flip easily.
Haines runs his boats on a nitro-methane mix but is in the minority, with most craft powered by petrol. Beginners can get into the sport and get competitive real quick for about $2000-$2500, which includes $1300 for a basic kit and hardware, $800 for a modified motor and $200 for the radio gear.
"The last four years the petrol revolution has taken over. Nitro-methane was all we'd run a few years ago and there's still a few old buggers like me using it but most are petrol."
Open oval racing rounded off the nationals yesterday but competitors also went head-to-head in 20-minute marathon races, sprints and endurance, where the boats tackled a slalom-like course.
Steve Trott, president of the Bay of Plenty modified powerboat club, said it was an inexpensive sport to get into.
"It's not a sport where you necessarily have to spend a lot of money, which is inconsistent with the rest of motorsport where quite often the guys with the deepest pockets win," he said.