FB VI (RAAF service Merlin 23 or 25)

Type: Fighter Bomber.

 

Dimensions

Wingspan                   54 ft 2 ins

Length                         40 ft 10ins (tail down)

                                                 41 ft 2 ins (tail up)

Height                         12ft 3.5 ins (tail down)

Wheel track                16 ft 4 ins

Wing Area                   454 sq ft 42.18 sq m.

 

Engines

Two Rolls Royce Merlin 23 or 25.

Single stage two speed supercharged V12 engines.

Coolant Ethylene Glycol/Water

Capacity                                    1649 cu ins 27 litres.

Take off power Merlin 23     1,390 hp at 3000 rpm and +18 lbs boost.

                                                    1,460 hp at 6,250 ft 14 lbs

                                                    1,435 hp at 11,000 ft 16 lbs

 

Take off power Merlin 25     1,610 hp at 3000 rpm and +18 lbs boost.

                                                    1,635 hp at 2,250 ft 18 lbs

                                                    1,510 hp at 9,250 ft 18 lbs

Gear change                             8,750ft Merlin 23, 7000ft Merlin 25

Max cruise                                2650 rpm +7 lbs

Max climb                                 2850 rpm +9 lbs

Engine weight                         1470lbs Merlin 23

                                                    1455 lbs Merlin 25


Propellers

De Havilland (Hamilton Standard) three blade constant speed fully feathering.12 ft diameter

 

Fuel Capacity

100/130 Octane

             Fuselage                                    2 x 25 gal

             Inner wing                                2 x 65.5 gal

                                                                 2 x 78 gal

             Outer wing                                2 x 24 gal

                                                                 2 x 34 gal

             Long Range                              63 gal

             Drop Tanks                               2 x 50 gal  or

                                                                 2 x 100 gal

 

Maximum Fuel                                    715 Imp gal 3250 litres

 

Performance

Max                                             378 mph @ 13,200 ft

                          608 km/hr

             Max Cruise                               296 mph @SL

                                                                 476 km/hr

             Econ Cruise                              250 mph 402 km/h

             Climb                                          9.5min to 9,500ft

Ceiling                                       26,000 ft 7,900 m

 

Range                                         Max 1,120 miles 1800 km

                                                                 At Max Cruise 960 miles at SL.
Weights

             Empty                                         14,300 lb 6,487 kg

             Max                                             22,300 lb 10,115 kg.

 

Armament

4 x 20mm Cannon with 150 rpg.

4 x .303in MG with 500 rpg

8 x 25lb or 60 lb Rockets

2 x 250lb or 500 lb Bombs internally

2 x 250lb or 500lb Bombs on wing racks

 

Crew

Pilot and Observer (Navigator)

 

 

Construction

Spars                                          Canadian Spruce

Plywood                                    Beech and Birch

Panel core material                Balsa

 

Limited amounts of walnut were also used in sections such as the wing attachment points.

 

Number built

A total of 2584 FB VI were built.

Mosquito Specifications