Secret WWII Aircraft

while certainly not secret for the whole war, you could talk about the German ME-262. It was a revolutionary German jet fighter.




"The Messerschmitt Me 262 Schwalbe or "swallow" was the first operational jet powered fighter. It was mass-produced in World War II and saw action from late 1944 in bomber/reconnaissance and fighter/interceptor roles. German pilots nicknamed it the Turbo, while to the Allies it was the Stormbird. Although the Me 262 had a negligible impact on the course of the war�shooting down an estimated 150 Allied aircraft for the loss of 100 Me 262s, the majority of aircraft grounded for lack of fuel�the jet was both well-known and highly influential on post-war aircraft development."

http://en.wikipedia.org/wiki/Messerschmitt_Me_262