I remember reading that the 15 was light in the bow with people in the cockpit, so for awhile I had a spare 2.5 engine in the forward part of the V-birth. It was alright but it tended to bring the bow down too much. I recently managed to put it under the starboard cockpit bench and it makes a pretty good counter to the 2.5 that is mounted on the port transom. I keep my anchor forward now and it seems to be a pretty good balance. The spare engine is a 2 cycle and it has no fuel in it so ther is no danger of gas leaking.