V B
There have been several a/c mentioned which have contra-rotating props, Shackleton, Tu-95 Bear,being the most notable. A few later mark Spitfires /Seafires also had Griffon engines with contra-props, also the Martin-Baker MB-5.A replica is being built in the USA at present,and "Red Baron",the racing Mustang also had a Griffon fitted.I recall that there was also an Italian racer which had two engines in the fuselage,one in front of the cockpit and one behind driving two props through a common g/box.
Contra rotating props would technically be props driven by the engine through a common g/box to give the opposite rotation.
Counter rotating props can be either conventional twins (usually) with each prop turning in the opposite direction of rotation,and seen from the cockpit props rotate (top blade) inwards , or outwards from the fuselage. The former would be the DH Hornet(the fastest fighter twin-piston ever,and best looking; and the P-38 would be one of the latter. I think some Piper/Cessna/Beech twins also have counter -rotating props as well. There is also a thread on "Aviation Nostalgia"- "more than 4 engines" which has some pictures of other a/c with multiple engine/prop combinations...
