Spartan B-1 Vanquish series (I - IV)
Spartan B-1 Vanquish
Picture by James, aka "Hood"
Spartan B-1A Vanquish II
Sp-21M Vanquish II
Spartan SP-21M/IMPA SI-21S
A floatplane equipped Sp-21 variant initially for the Commando de Aviacion Naval for the reconnaissance role with a secondary attack role.
Dimensions: span 20.42m; length 12.19; height 3.84m; wing area 600sq ft; wing loading 31.33 lb/sq ft; power loading 0.234kg/hp 0.10 lb/hp
Structure: all-metal monocoque fuselage in four sections with Z section fames and L section stringers with light alloy covering, light alloy used for tail construction and cantilever tailplane covering. Cantilever all-metal wing with two steel spars, all-metal split flaps and aluminium framed ailerons with fabric covering. Rudder and elevators aluminium framed with fabric covering. Two amphibious watertight floats fixed underwing with optional beaching wheels.
Weights: empty 11,670lbs, maximum take-off 18,800lbs Powerplant: two 1000hp Spartan 1000 supercharged radial engines
Performance: max speed 248mph; service ceiling 25,500ft; rate of climb 1,025ft per minute at 1,500ft; range 957 miles with 3,000lbs bomb load
Capacity: pilot in enclosed cockpit, navigator in rear fuselage cabin with one window and one access door ahead of radio operator/gunner in a hydraulic-powered dorsal turret
Armament: one dorsal turret with two 7.92mm FMG/M32 MG (drum feed), four fixed 13mm Browning HMG in the lower nose under the cockpit, bombload 3000lbs in one lower fuselage bomb bay or one semi-recessed 18-21in torpedo
Equipment: full controls and navigation equipment including receiver/transmitter, HF/DF set, naval co-operation beacon, Sperry autopilot, reflector gun sight with torpedo aiming bar, two cameras fitted in navigators cabin floor, three flare chutes and two rescue dinghies.
Spartan/IMPA SI-21D Vanquish IV
General Type:
Airplane = 1
Airship = 2
Orbiter = 3
1
Year of First Flight: 1940
Description
Conventional Aircraft
Monoplane
Conventional Fuselage
A monoplane medium fast bomber armed with two dorsal 13mm and one nose 13mm MG and a bombload of 4,000lbs. Self-sealing fuel tanks, 5mm armoured bulkhead behind pilot.
Characteristics:
Weight (maximum) 19,000 lbs
Weight (empty) 11,651 lbs
Length 48 ft
Wingspan 67 ft
Wing Area 600 sq ft
Sweep 3 degrees
Engines 2
Ripon R-1600-04A
Piston
1,600 hp
at 10,000 ft
Crew 4
Typical cost $0.057 million in 1940
Total number procured 144
Performance:
Top Speed 285 kts = 328 mph
at 15,000 ft
Mach N/A
Operational Ceiling 34,500 ft
Range 773 nm = 890 miles
with 4,100 lbs payload
4,367 lbs released at halfway point
Climb 2,265 fpm
Cruise 175 kts = 201 mph
at 15,000 ft
Corner Speed 226 KIAS =
284 kts at 15,000 ft
Mach N/A
Turning Rate 23.8 deg/sec
Radius 2,317 ft
Internal Data:
Intake / Fan Diameter 9 ft
Bypass Ratio 67.55
Engine Weight 1645 lbs
Overall Efficiency 22.5 percent
Structural Factor 0.98
Number of Wings 1
Number of Fuselages 1
Limiting Airspeed 250 kts
Wing Ultimate g Load 9.50 g
Wing Taper 0.3
Wing Thickness at Root 2.1 ft
Tail / Canard Factor 0.5
Number of Nacelles 2
Length 7 ft
Diameter 3 ft
Fullness 0.3
Fuselage Diameter 5.1 ft
Fuselage Fullness 0.4
Pressurized Volume 0 percent
Cargo Decks 0
Cleanness 70 percent
Unstreamlined section 4 sq ft
User equipment 1,460 lbs