Engineering:Allstar SZD-59
| SZD 59 Acro | |
|---|---|
| |
| Role | Club Class and aerobatic glider |
| National origin | Poland |
| Manufacturer | Allstar PZL Glider Sp.z o.o. |
| Designer | Jan Knapik[1] |
| First flight | 9 September 1991[1] |
| Number built | 2 prototypes and 23 or more serial ones[1] |
| Developed from | PZL Bielsko SZD-48-3 Jantar 3 |
The SZD-59 Acro is a single-seat glass composite glider for aerobatics and cross-country flying by PZL Allstar of Bielsko-Biała, Poland.[2][3][4]
The SZD-59 can be flown with a 13.2m span or a 15.0m span. Attaching or detaching the wing-tips takes only a few minutes.[1][3] With 15m wing-tips it is a competitive Club Class glider, while it is a competitive aerobatic glider in the 13.2m configuration.[4]
Design and certification
The SZD-59 Acro was derived from the SZD-48-3 Jantar Standard 3[2] in 1990–91 mainly by Jan Knapik.[1][4] The fuselage is only a slightly modified version of the one used in the Jantar Standard 3. However, the T-tail has been replaced by a cross-tail with larger rudder and the elevator of the SZD-42-2 Jantar 2.[4]
The design life is 15,000 hours, though at present it is approved for only 4,000 hours of operation.[2][3] In 15m configuration, the SZD-59 is approved in the utility category of JAR 22 (sailplanes) of the Joint Aviation Authorities, and in the 13.2m configuration it is approved according to the aerobatics category of JAR 22.[1][5]
Manufacturer
The prototype was first demonstrated during the 1991 FAI World Glider Aerobatic Championships in Zielona Góra. Twelve Acros were built by PZL-Bielsko until the production stopped in 1996 due to economic problems.[4] Allstar PZL Glider Sp. z o.o. in Bielsko-Biała (Poland)[3] restarted production of the SZD-59 Acros in 2004.[4] Currently, it is the only unlimited glider in serial production.[4]
Soaring
With a handicap factor of 100, according to the 2008 handicap list of the Deutscher Aero Club e.V.,[6] the SZD-59 in 15m-configuration is a typical Club Class glider. With 15m wing-tips with or without winglets glide performance can be enhanced by increasing its wing loading with up to 150 litres of water ballast,[3] but water ballast is not allowed in the 13.2m configuration.[7]
Aerobatics
In the 13.2m configuration, the SZD-59 is certified for unlimited aerobatics,[3] whereas with the 15m wing-tips only basic aerobatic maneuvers (looping, turn, chandelle, spin) are permitted.[7]
While international aerobatic championships in the unlimited category are dominated by Swift S-1 and MDM-1 Fox,[8] pilots have competed successfully with SZD-59 Acros in national and regional championships.[4] Recently, Wolfgang Kasper placed 4th in the German Nationals 2008.[9]
Specifications in utility configuration
Data from ,[3] maximum and maneuver speed according to [5]
General characteristics
- Crew: One
- Length: 6.85 m (22 ft 5.69 in)
- Wingspan: 15.00 m (49 ft 2.55 in)
- Height: 1.50 m (4 ft 11.06 in)
- Wing area: 10.66 m2 (114.74 sq ft)
- Aspect ratio: 21.01
- Empty weight: 270 kg (595.24 lb)
- Gross weight: 540 kg (1,190.48 lb)
Performance
- Maximum speed: 265 km/h (164.67 mph, 143.09 kn)
- Stall speed: 82 km/h (50.95 mph, 44.27 kn) *
- g limits: +5.3 / -2.65[10]
- Maximum glide ratio: 40 at 124 km/h*
- Rate of sink: 0.77 m/s (151.57 ft/min) **
- Maneuver speed: 200 km/h
- Water ballast: 150l
- Wing loading range: 31.00-50.70 kg/m2
* at 540 kg
** at 97 km/h
Specifications in aerobatic configuration
Data from ,[3] maximum and maneuver speed according to [5]
General characteristics
- Crew: One
- Length: 6.85 m (22 ft 5.69 in)
- Wingspan: 13.20 m (43 ft 3.69 in)
- Height: 1.50 m (4 ft 11.06 in)
- Wing area: 9.80 m2 (105.49 sq ft)
- Aspect ratio: 17.80
- Empty weight: 265 kg (585.22 lb)
- Gross weight: 380 kg (837.75 lb)
Performance
- Maximum speed: 285 km/h (177.10 mph, 153.90 kn)
- Stall speed: 74 km/h (45.98 mph, 39.96 kn) *
- g limits: +7.00 / -5.00
- Maximum glide ratio: 36 at 115 km/h
- Rate of sink: 0.70 m/s (137.80 ft/min) **
- Maneuver speed: 200 km/h
- Water ballast: 0l
- Wing loading range: 33.7-38.8 kg/m2[11]
* at 380 kg
** at 80 km/h
See also
Comparable aerobatic gliders
The aerobatic performance of the SZD-59 13.2m is comparable to:
- Celair GA-1 Celstar
- MDM-1 Fox and Solo-Fox
- Swift S-1
- Cirrus K
- Start & Flug H101 Salto
- Vogt Lo-100
Gliders with comparable cross-country performance
The soaring performance of the SZD-59 15m is comparable to Schleicher ASW 19, Glaser-Dirks DG-100, Rolladen-Schneider LS1f, Glasflügel H206 Hornet, PZL Bialsko Jantar Standard, Grob G102 Standard Astir, Bölkow Phöbus B3, Schempp-Hirth Cirrus/Cirrus VTC 17,74m, Schempp-Hirth Standard Cirrus 16m, Bölkow Phöbus C1, Akaflieg Darmstadt D37, Akaflieg Braunschweig SB 7, Neukom Elfe 17m, Standard Libelle 17m and the Delphin 1 by Fritz Mahrer.[6][12]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Piotr Piechowski: SZD-59 Acro (German) – accessed 2008-02-23
- ↑ 2.0 2.1 2.2 Official SZD-59 Acro website – accessed 2008-02-23
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Technical description of the SZD-59 Acro on SZD's website – accessed 2008-02-23; unavailable 2008-08-06, but equivalent to: Technical description of the SZD-59 Acro on the website of the German dealer (in German)[yes|permanent dead link|dead link}}] – accessed 2008-08-06
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 SAGA: SZD-59 Acro website (in German) – accessed 2008-02-23
- ↑ 5.0 5.1 5.2 British Gliding Association: Segelflugzeug-Kennblatt Nr.: 415 (German) by the Luftfahrt-Bundesamt – accessed 2008-08-05
- ↑ 6.0 6.1 2008 DAeC Handicap list – accessed 2008-02-23
- ↑ 7.0 7.1 Flight handbook of the SZD-59 Acro
- ↑ FAI World and European Glider Aerobatic Championships – accessed 2008-08-05
- ↑ Results of the German Glider Aerobatic Championships 2008 (unlimited)[yes|permanent dead link|dead link}}] – accessed 2008-08-02
- ↑ Allstar PZL Glider Sp website [|permanent dead link|dead link}}]
- ↑ calculated from data in Datasheet of the SZD-59 Acro on the SZD-Website – accessed 2008-02-23 – assuming a pilot weight of 55kg and 10kg trim weight
- ↑ Das Projekt "Delphin 1" (German) – accessed 2008-08-05
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