Polish single-seat glider, 1978
| SZD-49 Jantar K
|
| Role
|
Glider Type of aircraft
|
| National origin
|
Poland
|
| Manufacturer
|
ZSLS Bielsko
|
| Designer
|
Władysław Okarmus
|
| First flight
|
10 October 1978
|
| Status
|
prototype
|
| Number built
|
1
|
| Developed from
|
SZD-48 Jantar Standard 2/3
|
The SZD-49 Jantar K was a 15m Class glider designed and built in Poland in 1977.[1][2]
Development
After the FAI Standard class rules had been created and then modified in the early 1970s the FAI decided to add a new 15m class, for gliders with a maximum span of 15m but no other restrictions other than airbrakes limiting the speed to Vne or less. Władysław Okarmus set about designing a new wing, with flaps, for use with the SZD-48-3 fuselage, the resulting offspring was named SZD-49 Jantar K. First flight of the prototype, (SP-2583, X-143), took place at Bielsko in October 1978. All was not well with the SZD-49 during the flight trials and further development was abandoned. The sole prototype was later used as a live teaching aid for advanced students and was successfully modified twice with some success by groups of students from Warsaw University of Technology.[3]
Constructed almost entirely from glassfibre using epoxy resin, the SZD-49 had a welded steel tube centre-section truss to accept the loads from the wings, undercarriage and towing hook. A one-piece forward-opening canopy with integral glare-shield gave access to the cockpit for entry/egress and maintenance. The wings are fitted with full-span flaps with drooping ailerons as well as single-leaf airbrakes extending from top and bottom surfaces of the wing. Ailerons are driven through a patented linkage entirely enclosed inside the wing.[1]
A standard instrument fit and an oxygen system were provided by the manufacturer.
Specifications (SZD-49 Jantar K)
Data from [1]
General characteristics
- Crew: 1
- Length: 6.85 m (22 ft 6 in)
- Wingspan: 15 m (49 ft 2.5 in)
- Height: 1.51 m (4 ft 11 in)
- Wing area: 10.66 m2 (114.75 sq ft)
- Aspect ratio: 21.1:1
- Airfoil: NN 8
- Empty weight: 265 kg (584 lb)
- Gross weight: 385 kg (849 lb) without ballast; 535 kg (1,179.5 lb) with ballast
Performance
- Maximum speed: 250 km/h (155 mph, 135 kn)
- g limits: + 5.3 / -2.65
- Maximum glide ratio: 40 @ 97 km/h without ballast, 123 km/h with ballast
- Rate of sink: 0.60 m/s (118 ft/min) at (320kg/75 km/h); 0.69 m/s (136 ft/min) at (420 kg/ 86km/h)
See also
Aircraft of comparable role, configuration, and era
References
