jwilson
Well-Known Member
20hp is plenty of spare power on a Leisure 27, 10 or 14hp might be more common. If you are coming from planing or semi-displacement powerboats you will find engine powers on sailing yachts very low compared to what you are used to. Adding more power won't make the hull and keel or keels go through the water much faster. If A Leisure 27 had 10hp it might make 5.5 knots flat out. Putting double the power in would only take it to maybe 6.5. If you crammed in a 40 hp engine it might make an extra knot, but by then any extra would only create even more of a massive wash with little increase in speed. Sailing boat hulls with a very few exceptions will just not plane, and the few that are designed to do so usually compromise sailing ability.