Flak,

Just FYI.

The ONLY Mustangs that flew with a 3-blade prop were the Allison powered A models. These included the P-51, P-51A, A-36 and British Mustang Mk I and IA. These Mustangs actually had a shorter fuselage (vertical height) due to the Allison engine being smaller. When the Merlin was put into the Mustang, the cowling change required the fuselage to be enlarged to house the larger engine. The same "greenhouse" canopy was retained but the bottom edge of the canopy was several inches higher from the wing than on the A models. This newly engined Mustang was the B/C model (depending on which plant it was built at) and utilized a 4-blade prop.