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A: |
With an extremely fast boat (step bottom hydro or drag boat),
depending on your engine, a step-up gear may let you use a prop size
better suited to your needs. Gears for "class" boats are
usually worked out by trial and error, so stick to what has been done
successfully for similar boats. Step-up gears are the opposite of
reduction gears, but we still figure h.p. and rpm at the prop. With
step-up gears, shaft rpm of 10,000 is not unusual in racing craft. |
