Mark,
if you have a paddleboat that was supplied from a Nats then you are fine. What is important is that you run the same rubberbands as the competition to make it fair. If you run contest rubber for free flight airplanes and the competition does not, you might have a problem because you can go almost forever. Customarily, the host club has supplied the rubberbands.
Its designed to be a fun class for the kids and adults. However for some reason, there is a lot of rooting and yelling around the pool and the kids always seem to prevail in the Winners Circle.
Sounds like Dunny knew just when to pass that boat on to the next racer.
Thanks,
Al Waters