"A note about the radial powered aircraft!"

Albatros C5/16

Albatros W4 

Avia Bh10

Bell X5

Fokker Dr1

Fokker E2 Bavarian Air Corp

Fokker E3 Ottoman Empire

Fokker D6

Fokker D8

Lohner S

Pa18

Pfalz D3

Sopwith "Bat Boat"

Twin Circa 1930

Me 163b "Komet"

Me109b