Did you know…
How many blades did the Spitfire's propeller have?
Short answer
Up to six: some early Mk 22s had a six-bladed contra-rotating propeller to absorb the Griffon's 2,035 hp and cancel torque. Most flew with the five-bladed Rotol, as did the last model, the F.24 with a Griffon 85. On one Seafire variant it had four.

The maximum: six blades
Some early Mk 22s received a six-bladed contra-rotating propeller, capable of absorbing the Griffon's 2,035 hp and cancelling engine torque. Whenever the Griffon drove six blades, it was always a contra-rotating unit. Most of those aircraft, however, flew with the large five-bladed Rotol propeller.
Five blades on production Griffons
With the Griffon, five blades were the norm. The F.24, the last Spitfire model, was powered by a Griffon 85 driving a five-bladed Rotol propeller. One of those F.24s served with 80 Squadron.
Four blades on the naval branch
On one of the Seafire variants, its two engines drove a four-bladed Rotol propeller 10 ft 9 in (3.28 m) in diameter.
More questions

Aviation history
Which was the most-produced American fighter of the Second World War?
The Republic P-47 Thunderbolt, of which 15,636 or 15,683 units were built, depending on the source. It was also one of the heaviest fighters of the conflict… more…

Aviation history
Who flew the E-66 at 2,149 km/h?
Konstantin or Vladimir Kokkinaki, depending on the source. Konstantin is credited with the absolute record on a closed 100 km circuit, at 2,148.66 km/h, set… more…

Fly-by-Owen (CC BY SA), vía commons Aviation history
How many I-11Bs were built?
Between 208 and around 450, depending on the source: one of the AISA I-11 reference sheets gives 208 examples built, while All-Aero speaks of around 400 built… more…

Aviation history
How many HH-53s could be converted to Pave Low III?
Eight HH-53C aircraft received an improved systems package and were redesignated HH-53H Pave Low III. The other figure in circulation, nine MH-53H and 32… more…

SCDBob (CC BY SA), vía commons Aviation history
What did the A129 Mangusta's armor protect?
The fuselage: the A129's airframe is armored and, according to All-Aero, designed to protect against 12.7 mm rounds, with partial protection against 23 mm… more…

Fly-by-Owen (CC BY SA), vía commons Aviation history
What landing gear and canopy did the AISA I-11B have?
According to one account, AISA reduced the cockpit canopy and fitted tailwheel gear on the production I-11B. All-Aero claims the opposite: the I-11B was… more…