British Anzani Inboard Motor.
British Anzani "Dinghy Motor"
This is something I picked up, this is not a common motor at all, as I have not seen another.
This is what's known as an Anzani Dinghy Motor, it was advertised at the Earls Court Boat Show in 1951 and looks to be powered by a converted Anzani Super Single engine,
The Dinghy Motor was not on sale until the summer of 1952 and was still advertised in 1954.
The original design had a round fuel tank with the carburettor above the engine and the exhaust below, which looked pretty much like a super single motor on it's side, but a carburettor above the exhaust is never a good idea.
The next design had the carburettor low down and the exhaust above, with a square tank. Basically the cylinder was turned 180 degrees.
So far I have come across three different designs of this motor including my own.
I suspect my motor to be an early version of the square tank design, as it still incorporates the cylinder head support, which is not seen in the later advertisments.
Rated at 4HP at 3,500 r.p.m with a 57mm stroke and 62mm bore.
The motor works by lowering and raising the engine, as the motor is mounted on a spring loaded pedestal, controlled by the main lever with a rack and pinion system.
Raising the motor engages the belt and gives forward drive.
Lowering will disengage the drive belt to give you neutral.
Even lower will engage the main pully to the friction drive pully, which then gives you reverse.
The Dinghy Motor also has a mechanical water pump, this is spring loaded and runs off the friction part of the drive pully.
Forward drive will give a 2-1 reduction speed to the propshaft.
The motor weighed 52lb and cost £49.10s.