Here’s a closer look at the boats and the champions who’ve propelled New Zealand’s Hydro Thunder scene into the spotlight.
Grand Prix Hydroplanes
Grand Prix Hydroplanes represent the pinnacle of powerboat racing. These 23- to 26-foot beasts, equipped with supercharged V8 engines, deliver an astonishing 1,500 horsepower, tearing across the water at speeds exceeding 270 km/h (a record set by NZ National Record holder is Graeme Weller). The class has produced thrilling performances over the years, including David Alexander’s championship run in Miss Waverly (2022). This class is intense. Graeme Weller’s national speed record is 271.955kph in G-Force. Seven formidable boats will battle for supremacy this weekend.

Modified Hydroplanes/GN Class
Combining innovation and strict regulations, the Modified Hydroplanes/GN Class features boats with engine and hull constraints. Standouts like Steve Mathieson (Midnight) and Max Webb (Major Rager, 2023 champion) have left their mark here. Five boats are set to contest this competitive class.
Formula 1 Class
If speed thrills, Formula 1 delivers. These tunnel boats race on air cushions at speeds over 120 mph, challenging drivers with up to 5G forces as they navigate tight turns. Julian Stilwell (Johnston Associates) reigned supreme in 2022, while Luke Sharp set the kilo speed record at 210.496 kph. Four teams are ready to make waves this weekend.

Formula 3 Class
Formula 3 showcases a diverse range of hydroplanes powered by engines up to 1650cc. The category emphasises agility and precision, with past national champs like Vicky Hall (Iron Maiden, 2023) pushing the limits. Scott Coker’s speed record in Howzat (162.637 kph) underscores the excitement of this class. Look out for six contenders vying for the top spot.
Series 3000/Prostock
The Series 3000/Prostock class combines speed and strategy, with strict limits on engine size (up to 3000cc). Allan Stiener’s triumph in Misty Blue (2023) highlights the class’s competitive edge. Expect thrilling races from six fiercely tuned machines.
Clubman’s Class
For racers aged 15 and over, the Clubman’s Class offers an accessible gateway into powerboat competition. Boats here feature standard engines and varied hull designs, fostering creativity alongside competition. Patrick Morris (The Judge) holds the speed record at 83.36 kph, while past champions like Mark Taiatini (Taniwha) have demonstrated the class’s appeal. Six entries will battle it out in Mangakino.
Junior Class
Hydro Thunder nurtures future champions with the Junior Class, open to racers aged 12–15. Boats are equipped with standard 30hp engines, ensuring a level playing field. Sam Martin (Barracuda), the 2023 champ, exemplifies the talent emerging from this category. Four young drivers will compete this weekend.
Looking ahead as racing starts tomorrow
As Mangakino hosts this weekend’s Hydro Thunder NZ Series, each boat class promises action, speed, and unforgettable moments. From the roaring Grand Prix Hydroplanes to the spirited Juniors, there’s something for everyone. Don’t miss your chance to witness powerboat racing at its finest.