Seen here in 2009 a former nazi's navy (Kriegsmarine in German) light helicopter Focke-Achgelis Fa-330. It's now at the Paris-Le Bourget air & space museum.
Picture added on 01 July 2010 at 10:15
Comments:
Not really a helicopter, since it had no engine! More like a simple, single-seater autogyro kite with a three-bladed rotor, often towed by German submarines, tethered to the U-boat by a 150 m (500 ft) cable. The airflow on the rotors as the submarine motored along on the surface would spin them up. The kite would then be deployed behind the U-boat with its observer/pilot aboard, raising him approximately 120 m above the surface where he could see much farther; 25 nautical miles (46 km) compared to the 5 nautical miles (9 km) visible from the conning tower of the U-boat.
Added by Peter Langsdale on 01 July 2010.