Some faster airplanes had symmetrical wings, I'd guess the F-104 was one. Not sure about FD2, Bristol 188, Bristol 221. And aren't helicopter blades symmetrical?
edit - interesting to use barit1's list and search for 'biconvex', that finds quite a few more symmetricals
.
AerMacchi MC.72 - Schneider Trophy racing seaplane (1931)
AerMacchi M.67- Schneider Trophy racing seaplane (1929)
AIDC Ching-Kuo IDF - Indigenous Defence Fighter (1989)
Albert A-10 - Possibly (1926-33)
Breda 19 - Biplane Fighter (1928)
Bristol 188 - Stainless Steel twin (1982)
Canadair CL-201 CF-104
Canadair CL-90 CF-104
Focke Wulf A43 Falke - Light utility Monoplane (1932)
Handley Page HP.115 - High sweep delta (1961)
Helewan HA-300 - Egyptian fighter (1964)
Leduc O.21 - French ramjet (1947)
Lockheed 246 F-104 - (1954)
Lockheed XQ-5 - M4.3 drone (1951)
Lockheed X-27 Lancer - not flown
Lockheed X-7 - ramjet flying testbed (1951)
Miles Gillette Falcon - modified M3B (1946)
Miles M.52 - supersonic research aircraft (not flown)
Nord CT.41 PQM-56A - M3.1 target drone (1959)
Renard R.31 - Belgian parasol monoplane (1932)
Republic AN/USD-4 - not known, possibly drone
.
The Albert TE-1 dates from 1926 and the Albert A-20 is from 1933 so presumably the Albert A-10 is from the same era. The Breda 19 is contemporary and the Aermacchi Schneider Trophy planes a little later. Possibly other Schneider Trophy planes may also have symmetrical airfoils.
.
Our neighbour who was an eminent Bristol Engines man bought a car for his wife and occasionally drove it to work with a broad grin on his face. It was a little green Hillman Imp with the Bristol registration WHY188.
.
Last edited by mike-wsm; 8th Jan 2011 at 21:51.