2007 crownline 21 SS, Mercruiser 5.0 motor with 220 HP Bimini top Stereo 2007 CROWNLINE 21 SS OPEN BOW BOAT This is a 21? open bow boat that is powered by a Mercruiser 5.0 motor with 220 HP with only 194 hours. It comes with a Bimini top, stereo, dual batteries with switch, front and rear boarding ladders, in floor storage and bow and cockpit cover. It rides on a tandem axle trailer with fold away hitch for short storage, custom rims and spare tire. This boat is all ready for fun on the water!