For a hull this size, ?10v? just isn?t enough. Since this is a sport boat, I?d recommend using 8S (two easy-to-find 4S packs in series) and a motor with a Kv between 800-900. The NAMBA racing power rules for 1/8 scale are actually rather mild and would work well for the OP. Generally, with motors of the same quality, the bigger one will spin a larger prop faster. The large motors like the 56x92 are simply not needed, they weigh more, cost more, and are often difficult to fit into a scale hydro. A 40x102 or similar would work great, spinning props in the range of 55-60 mm. Speeds would not be slow, depending on the prop between 55 and 60 with a well set up boat, a bit higher with more aggressive props.
One reason for the mild race setup is that with all the detail in an 1/8th scale hydro, a high speed flip means a lot of damage. Keeping the speeds down reduces the chances of an accudent.
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