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Here is the Canterbury Belle sidecar boat. Constructed circa 1960, both bike and boat measured about eight feet in length, and could carry two people making the combined capacity four people! The motorcycle is a 650cc Ariel Huntmaster. In the bow of the boat resides an 80cc, two-stroke JAP engine producing 1.9 bhp at 3,750 rpm, good for a reported top speed of 11 knots. The 168-pound boat slides into slots in the sidecar frame and is secured by way of four quick-release bolts, making it easily removable. The boat’s rudder is operated by a joystick: forward to go right, back to go left.
The HydroRunner by Robert Q. Riley may make for a modern boat/sidecar. See link below.