Steven is this for Hydro 2/Formula 4, or the new SWARM "run what you brung" class?
If it is for Hydro2 or Formula 4 both of the motors in the first post will be too big I would be looking at Lehner 1940/1950 or Neu 1415/1512/1515.
If it is for run what you brung it is hard to advise with the course and runtime being decided on the day, you would need a LOT of battery with the big motors if there are a lot of Monos or ECOs and the run time is 6 minutes+. I don't think I would go for a hydro though in case the course was an M or triangle and you needed to turn both ways. Maybe you know a bunch of guys have or are building sprint oval boats for the class, in which case ignore what I said in this paragraph and let me know, as I have wanted to do some competitive sprinting for a while and that would get me to a few SWARM races despite it being out of my area.
Paul Upton-Taylor, Greased Weasel Racing.
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