I used to run a single trinity ruby 16 triple on a 2:1 ratio on 7 1700SCRC NiCads with X640 in an 18" cat giving 28mph. Upgraded to 400 size Mega 1615/3 10C3100mah 3s, X431 cut to 28mm for 36mph in the same hull with double the run time.
A dual gear drive is pretty heavy for an 18" hull normally we would be using them in 24-27" boats. I would take one out and use it as a single on 2s if you have the ESC already or if you don't go BL its not worth buying brushed stuff these days, you could probably get a cheap BL motor and ESC for similar price to a brushed ESC and get much better performance.
Paul Upton-Taylor, Greased Weasel Racing.
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