If your mechanicals are dependable I'd run it home at 1800rpm .... whatever speed that is.
Why your boat is going so slow can be sorted out later. Sounds like the boat is designed for higher speeds and has a hull somewhere between an Island Gypsy and a Californian. If the boat is excessively heavy or the gear ratio is Way different .. or both it will eventially be obvious what's going on. Sounds like it's got a 3-1 gear to me.
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Eric
North Western Washington State USA
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