In similar fashion to other engine families designed by Coatalen the Cossack spawned a straight-six derivative in the Amazon, in effect half a Cossack, retaining the 110 x 160mm bore/stroke, overhead camshaft, four poppet valves per cylinder and cast-iron cylinder blocks in groups of three. An output of 160 hp (119 kW) from 9.2 l (561 cu in) for a running weight of 747 lb (339 kg) led to a high power to weight ratio. Despite the high output the Amazon was little used in Britain, with only possible use aboard Coastal airships and some supplied to the Imperial Russian Air Service. Amazon production totalled 77 out of an order for 100, 23 of which were cancelled. A non-aviation use version of the Amazon was produced as the Sunbeam Amazon II, fitted with hand and/or compressed-air starters and single magneto ignition system.
A straight six version of the Cossack retaining the dual ignition system, bore and stroke and cast-iron blocks in groups of three. Rated at 160 hp (119 kW) at 2,000rpm.
A non-aviation use version of the Amazon with single ignition system. Rated at 160 hp (119 kW) at 2,000 rpm.