The Orka is a low cost, light utility aircraft, of unorthodox configuration, designed and marketed by Margański & Mysłowski Aviation Works in Poland, manufacturers of the Fox glider among others. The Orka has a slim glider-like fuselage and two pusher engines.
An attractive and fast aircraft, it will also make for a similarly attractive and fast model. Planned for electric power, we think this will be a special model indeed.
EM-11 Orka – Design, Development, Production and Performance
The EM-11 Orka is a Polish-designed, twin-engine utility aircraft developed during the 1990s as a modern replacement for ageing light transports such as the Antonov An-2, PZL-104 Wilga and PZL M28 in certain roles. Designed by Margański & Mysłowski Zakłady Lotnicze (MMZL), the aircraft combined composite construction with modern turboprop engines and Short Take-Off and Landing (STOL) capability.
Despite its innovative design and promising performance, the programme never entered series production. Only a single prototype was completed, and the project remains one of Poland’s most ambitious post-Cold War general aviation developments.
Background
Following the political and economic changes that occurred in Eastern Europe after 1989, the Polish aerospace industry sought to develop aircraft that could compete internationally.
The design goals for the EM-11 included:
- replacement of ageing utility aircraft
- reduced operating costs
- improved passenger comfort
- modern composite construction
- excellent STOL performance
- low maintenance requirements
- operation from unprepared airstrips
Unlike many aircraft developed from existing designs, the EM-11 was conceived as an entirely new aircraft using contemporary materials and manufacturing techniques.
Design Team
The aircraft was designed by:
Margański & Mysłowski Zakłady Lotnicze (MMZL)
Principal designer:
Edward Margański
Edward Margański had earned an international reputation for designing advanced sailplanes and composite aircraft. His experience with lightweight composite structures strongly influenced the EM-11’s design philosophy.
Development
Development commenced during the early 1990s.
Major milestones included:
- Initial concept studies in the early 1990s
- Detailed design completed in the mid-1990s
- Prototype construction during the late 1990s
- First flight on 8 August 2003
The programme attracted considerable attention because relatively few commuter aircraft of this size had been designed using composite primary structures.
Flight testing confirmed many of the predicted handling qualities and performance characteristics.
However, obtaining sufficient investment to support certification and production proved difficult.
Design Philosophy
The EM-11 was intended to combine:
- modern aerodynamics
- composite construction
- STOL capability
- high fuel efficiency
- comfortable passenger accommodation
- low acquisition cost
- ease of maintenance
Potential missions included:
- regional passenger transport
- air taxi
- cargo transport
- medical evacuation
- surveillance
- agricultural support
- government operations
Airframe Design
Wing
The aircraft features a high-mounted cantilever wing.
Characteristics include:
- straight planform
- moderate aspect ratio
- composite construction
- large Fowler flaps
- wing struts eliminated by cantilever design
The high wing provides:
- excellent downward visibility
- good obstacle clearance
- stable low-speed handling
- efficient loading operations
Fuselage
The fuselage employs extensive composite construction.
Features include:
- semi-monocoque structure
- spacious rectangular cabin
- large rear cargo door
- flat cabin floor
- generous baggage volume
The cabin was designed to allow rapid conversion between passenger and freight configurations.
Tail Unit
The aircraft employs a conventional tail arrangement with:
- high-mounted horizontal stabiliser
- large vertical fin
- generous control surface areas
These provide excellent directional stability, particularly during low-speed STOL operations.
Cockpit
The cockpit accommodates:
- two pilots
Features include:
- side-by-side seating
- excellent external visibility
- dual flight controls
- modern avionics
- ergonomic instrument layout
The prototype demonstrated a modern “glass cockpit” philosophy compared with earlier Polish utility aircraft.
Landing Gear
The aircraft employs:
- fixed tricycle undercarriage
Characteristics include:
- robust construction
- low-pressure tyres
- operation from grass strips
- operation from gravel runways
- simple maintenance
The fixed undercarriage reduces operating costs while increasing reliability.
Powerplant
The EM-11 is powered by:
2 × Pratt & Whitney Canada PT6A-135A
Each engine develops approximately:
750 shp
The PT6A was selected because of:
- exceptional reliability
- worldwide support
- low operating costs
- excellent fuel efficiency
- outstanding STOL performance
The engines drive constant-speed, reversible propellers.
Composite Construction
One of the most advanced aspects of the EM-11 was its structure.
Composite materials were extensively employed in:
- wing skins
- fuselage skins
- empennage
- control surfaces
- fairings
Advantages included:
- lower structural weight
- corrosion resistance
- improved fatigue life
- smooth aerodynamic surfaces
- reduced maintenance
At the time, relatively few commuter aircraft made such extensive use of composites.
STOL Design Features
To achieve excellent short-field performance, the aircraft incorporated:
- high-lift wing
- Fowler flaps
- powerful PT6A engines
- large propeller diameter
- low wing loading
- robust landing gear
These characteristics enabled operation from relatively short, semi-prepared airstrips.
Cabin
The passenger cabin was designed for:
- 19 passengers
Alternative layouts included:
- cargo
- mixed passenger/freight
- medical evacuation
- executive transport
Large windows provided excellent passenger visibility.
Production
Manufacturer:
- Margański & Mysłowski Zakłady Lotnicze
Production location:
- Bielsko-Biała, Poland
Production period:
- Prototype completed 2003
Production total:
- 1 prototype
Despite successful flight testing, the programme failed to attract sufficient commercial orders to justify series production.
Specifications
| Item | Specification |
|---|---|
| Crew | 2 |
| Passengers | Up to 19 |
| Length | 14.26 m (46 ft 10 in) |
| Wingspan | 18.40 m (60 ft 4 in) |
| Height | 5.20 m (17 ft 1 in) |
| Maximum Take-off Weight | Approximately 6,500 kg (14,330 lb) |
| Engines | 2 × Pratt & Whitney Canada PT6A-135A |
| Power | 750 shp each |
Performance
| Performance | Value |
|---|---|
| Maximum Cruise Speed | Approximately 270 km/h (146 kt) |
| Maximum Speed | Approximately 300 km/h (162 kt) |
| Range | Approximately 1,500 km (810 NM) |
| Service Ceiling | Approximately 7,000 m (23,000 ft) |
| Take-off Distance | Approximately 500 m |
| Landing Distance | Approximately 450 m |
Note: As the EM-11 remained an experimental prototype, published performance figures vary slightly between sources and were never finalised through a full certification programme.
Flying Characteristics
Test pilots reported that the EM-11 exhibited:
- excellent low-speed stability
- predictable stall characteristics
- responsive controls
- benign handling
- good short-field capability
- comfortable ride quality
The combination of a high wing, powerful turboprops and advanced aerodynamics gave the aircraft handling qualities well suited to utility and regional transport operations.
Why the Programme Ended
Several factors contributed to the project’s cancellation:
- limited investment capital
- relatively small domestic market
- competition from established aircraft such as the Viking DHC-6 Twin Otter, Let L-410 and Cessna Caravan
- high certification costs
- limited export orders
Without sufficient launch customers, the cost of achieving full certification and establishing a production line could not be justified.
Legacy
Although the EM-11 Orka never entered production, it demonstrated the capabilities of the Polish aerospace industry in the post-Cold War era. Its extensive use of composite structures, efficient PT6A turboprop engines and emphasis on STOL performance anticipated trends later seen in several modern regional utility aircraft. Today, the sole prototype remains an important example of innovative Polish aircraft design and reflects the ambition to develop a competitive, home-grown successor to Poland’s long-serving utility aircraft fleet.