New stuff for 1948:

KOOPD X-01 Sikumbang
A single-seat low-wing monoplane of mixed construction of conventional configuration. It has a fixed tricycle undercarriage and the pilot is seated under a bubble canopy. The prototype made its maiden flight on 11 July 1947 and production began during 1948. The prototype was powered by a 190hp Walter Major 6 engine, but production aircraft received a more powerful Argus 410.
The all-metal construction X-02 variant is now in design.
Wingspan: 10.61 m (34 ft 10 in)
Length: 8.16 m (26 ft 9 in)
Height: 3.35 m (11 ft 0 in)
Wing area: 16.9 m2 (182 sq ft)
Empty weight: 795 kg (1,753 lb)
Gross weight: 1,090 kg (2,403 lb)
Fuel capacity: 205 Litres (45 imp gal)
Powerplant: 1x 240hp Argus As410
Maximum speed: 276 km/h (171 mph)
Cruising speed: 244 km/h (151 mph)
Range: 960 km (597 miles)
Service ceiling: 5,100 m (16,730 ft)
Rate of climb: 5.6 m/s (1,100 ft/min)
Armament: 2x 13.2mm FN-Browning machine guns in the wings, four bomb racks for 2x 150kg or 4x 50kg bombs or 4x rockets underwing
KOOPD X-03 Belalang
A basic trainer with a low monoplane wing and of mixed construction. The undercarriage is fixed and the pupil and instructor sit in tandem. The prototype first flew on 28 February 1948 and production of the Belalang 90 began in December.
Wingspan: 9.50 m (31 ft 1 in)
Length: 7.70 m (25 ft 3½ in)
Height: 2.03 m (6 ft 8 in)
Wing area: 15.0 m² (161.5 sq ft)
Empty weight: 230 kg (506 lb)
Maximum take-off weight: 330 kg (726 lb)
Powerplant: 90hp Continental C-90-12F air-cooled flat-four
Cruise speed: 130 km/h (80 mph)
Range: 564 km (350 miles)
Service ceiling: 3,700 m (12,000 ft)
Rate of climb: 2.3 m/s (460 ft/min)
Fokker S.XV
A development of the S.XI Instructor first flown in May 1948 powered by a 260hp Minerva-Avia Minion Minor piston engine with a maximum speed of 265 km/h (164 mph). First deliveries were made in December 1948.
Koolhoven F.K.62
As the Royal Netherlands Air Force began looking at jet-powered fighters, it also saw the need to experiment with high-speed jet-powered fast bombers. Koolhoven took their F.K. 61 and simply removed the piston engines and fitted two 3,000lb Rayton Swazi centrifugal turbojets in revised nacelles. A production airframe was converted in September 1945 and made its first flight on 29 December 1946 as the F.K.61S. A series of eight pre-production aircraft designated F.K.62 followed from February 1947. These differed in having a new tail unit with more dihedral on the tailplanes and more streamlined nose. The new main undercarriage retracted into the inner wingroots. The two crewmen were seated on Danish ejector seats, the navigator/ bomb-aimer sitting in the nose. Production aircraft were powered by two 4,200lb VB.04 Stuart Zulu centrifugal turbojets. Production of 135 F.K.62s began in January 1948. 36 were completed as F.K.62R high-altitude reconnaissance aircraft with five cameras fitted in the former bomb bay.
Wingspan: 21.34 m (80 ft 0 in)
Length: 15.03 m (49 ft 3 in)
Height: 5.73 m (18 ft 8 in)
Wing area: 66.03 m2 (710 ft2)
Gross weight: 15,043 kg (33,164 lb)
Max take-off weight: 17,250 kg (38,030 lb)
Powerplant: 2x 4,200lb VB.04 Stuart Zulu centrifugal turbojet engines
Maximum speed: 716 km/h (445 mph) at 12192 m (40,000 ft)
Service ceiling: 13106 m (43,000 ft)
Range: 1610 km (1,000 miles) internal fuel
Armament: 2000kg (4,409 lb) of bombs in an internal bomb bay and 1000 kg (2,204 lb) externally or 12x 75mm rocket projectiles underwing
Stichting voor de Ontwikkeling en Bouw van een Experimenteel Hefschroefvliegtuig (Foundation for the Development and Construction of an Experimental Helicopter (SOBEH)
Founded in August 1948 to foster research and development of Dutch helicopters. This initiative was launched with the support of the NLL, NIV and RSL.
Nurtanio Wiweko Glider N.V.
Founded in May 1946 by Wiweko Soepono, Nurtanio Pringgoadisurjo, and J. Sumarsono in a workshop in Magetan, near Madiun, DEI. The company designs and builds gliders.
Currently in Production:
Zögling
NWG-1
In Development:
WEL-X – motorised glider with a Harley Davidson engine, first flown in March 1948