It was a tough day for Whanganui's top former national champions in the Biolytix Group B class at Shelterview.
Hayden Wilson and navigator Chris Hausman had a series of DNF, while defending national champion Ross Travers and son Shane had a mountain of problems with their Radioactive boat, only racing two of the four qualifiers and ultimately bowing out in the Top 5 eliminator.
"We blew the battery to bits," Ross Travers said.
"The drive shaft, we did that [damage] in the second one - Hayden Wilson actually gave us one."
Travers said the pace of the boat was still there from last season, but further problems with the fuel system on top of the other issues meant they just could not get going.