SAI KZ III

SAI KZ III
SAI KZ III
	KZ III air ambulance at The Danish Collection of Vintage Aircraft
General information
Type	utility aircraft
Manufacturer	SAI
Primary user	Denmark
Number built	66
History
Manufactured	1946–1951
First flight	11 September 1944

The SAI KZ III Lærke ("lark") was a Danish light utility aircraft used by the Danish Air Ambulance Service and Danish Air Force.

The first KIII was built during the German occupation of Denmark and first flew on 11 September 1944. With German permission it was transferred to the Redningskorpset (Rescue Service).^[1]^[2] A second war-time example was smuggled to Sweden. The two wartime aircraft had 90 hp (67 kW) Gipsy Minor I engines.^[2]^[3]

The KIII had a high wing braced by V-struts to the lower fuselage. Its fuselage had a steel tube structure and, like the rest of the aircraft, had fabric covering. Its two front seats shared dual controls. Slotted flaps and fixed, full span slots provided a gentle stall.^[2]

64 were built post-war^[2] with 100 hp (75 kW) Blackburn Cirrus Minor II engines.^[4] Many of these went to flying clubs, mostly in Denmark but with sales to several near-by countries. A few went further, one to Singapore and another to India, where its airframe still survives.^[2]

Operators

Civil operators

Denmark

Danish Air Ambulance Service

Military operators

Denmark

Royal Danish Air Force.

Specifications

Data from Jane's all the World's Aircraft 1947.^[5]

General characteristics

Crew: two
Length: 6.6 m (21 ft 8 in)
Wingspan: 9.6 m (31 ft 6 in)
Height: 2.1 m (6 ft 11 in)
Wing area: 13 m² (140 sq ft)
Airfoil: NACA 23012^[6]
Empty weight: 368 kg (811 lb)
Max takeoff weight: 706 kg (1,556 lb) with auxiliary tank full, 34 kg (75 lb) and extra 21 kg (46 lb) luggage
Fuel capacity: 68.2 L (18.0 US gal; 15.0 imp gal) in main fuselage tank and 41 L (11 US gal; 9.0 imp gal) in auxiliary tank
Powerplant: 1 × Blackburn Cirrus Minor II four cylinder inverted air-cooled in-line piston engine, 75 kW (100 hp)
Propellers: 2-bladed Weybridge, 1.9 m (6 ft 3 in) diameter wooden fixed pitch propeller

Performance

Maximum speed: 185 km/h (115 mph, 100 kn) at sea level
Cruise speed: 170 km/h (110 mph, 92 kn) at 2,200 rpm
Landing speed: 55 km/h (34 mph; 30 kn)
Range: 500 km (310 mi, 270 nmi)
Ferry range: 805 km (500 mi, 435 nmi)
Service ceiling: 4,115 m (13,501 ft)
Maximum glide ratio: 1:8 (flaps up); 1:5 (flaps down)
Rate of climb: 3.6 m/s (700 ft/min)
Wing loading: 48.83 kg/m² (10.00 lb/sq ft)
Power/mass: 9.72 kg/kW (16 lb/hp)
Take-off run: 70 m (230 ft)
Landing run: 50 m (160 ft)

References

^ "The KZ-III". Flight. L (1966): 215. 29 August 1946. Retrieved 2008-09-15.
^ ^a ^b ^c ^d ^e Simpson, Rod (Winter 2021). "The KZ Legacy". Air Britain Aviation World: 238–242.
^ "KZ III" (in Danish). Retrieved 2023-08-06.
^ Simpson, Rod (2001). Airlife's World Aircraft. Shrewsbury: Airlife Publishing Ltd. p. 485. ISBN 1-84037-115-3.
^ Bridgman, Leonard, ed. (1947). Jane's all the World's Aircraft 1947. London: Sampson Low, Marston & Co. p. 111c.
^ Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.

External links

Profile at The Danish Collection of Vintage Aircraft

[Flight220547p464-1] "The KZ-III". Flight. L (1966): 215. 29 August 1946. Retrieved 2008-09-15.

[AMAW-2] Simpson, Rod (Winter 2021). "The KZ Legacy". Air Britain Aviation World: 238–242.

[3] "KZ III" (in Danish). Retrieved 2023-08-06.

[AWA-4] Simpson, Rod (2001). Airlife's World Aircraft. Shrewsbury: Airlife Publishing Ltd. p. 485. ISBN 1-84037-115-3.

[JAWA1947-5] Bridgman, Leonard, ed. (1947). Jane's all the World's Aircraft 1947. London: Sampson Low, Marston & Co. p. 111c.

[Selig-6] Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.

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