Roughly how long and how narrow is the pond?
Do you want to turn at high speed or are you happy slowing down for corners?
Are you after something for you to use, or for your grandsons, or for both? If for them or both, do they have any previous RC experience? if they have limited experience I would avoid any 2s boats, if you make a small boat designed for at least 3s then you can fit a 2s battery and very easily tame it down for the kids. A 4s or 6s boat will be much bigger, more expensive and needs more room to run in, but is also faster and handles rougher water; you could also run 2x 2s or 2x3s batteries wired in series when you drive for high speed, or wired in parallel when the kids drive for half speed but 3-4x the runtime.
What type of boat interests you, scale or functional appearance? Surface drive or submerged prop? Mono Cat or Hydro?
This is probably dictated by the size of your pond, but do you have a size of boat in mind?
When did you build the planes? Is your radio a 2.4ghz radio that can be used for boats, or is it an old 35/72mhz unit that can't be?
Were the planes Electric or IC? Do you have anything other than radio gear that could be used in a build, batteries for example, or a motor and ESC from a crashed plane?
What do you consider silly expensive? Do you have a budget you are trying to stick to?
Paul Upton-Taylor, Greased Weasel Racing.
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