MDM-1
FOX glider
Offer
is a two-seat composite aerobatic glider
(permissible overloads + 9 / -6 g – option I. + 7 / -5 g – option II).
Characteristic
MDM-1 FOX glider
The two-seater aerobatic glider MDM-1 Fox was designed on the basis of design experience during work on Kobuz, Jantar and S-l Swift gliders by the MSc. Edward Margański’s construction team. Construction works started in November 1992 and the first prototype was test flown on July 9, 1993.
Technical description
Wings
2-panels of high convergence trapezoid contour. Single girder construction with auxiliary girder with sandwich cover. I-beam girder. Single plate aerodynamic brakes on the upper surface of the wings.
Friese ailerons with constant chord and large span, two-piece, mass-balanced, suspended on 7 supports.
Structure layout comprising I-beam main spar plus auxillary spar with sandwich stressed skin.
Technical data
Basic technical data
| Wing span | 14.00 m |
| Length (to the top of the rudder) | 7.38 m |
| Altitude (measured on the flight line) | 2.25 m |
| Dihedral | 0° |
| Wing area | 12.34 sqm |
| Aspect ratio | 15.88 |
| Wing root cord | 1.308 m |
| Average reference chord | 0.971 m |
| Wing airfoil | NACA 64(1) 412 |
| Horizontal stabilizer span | 3.16 m |
| Surface | 1.873 sqm |
| Airfoil | NACA 63(1) 012 ÷ 63 006 mod. |
| Vertical stabilizer surface | 1.123 sqm |
| Airfoil | NACA 63(2) 015 ÷ 63(1)012 |
| The center of gravity of the empty glider | 620 - 665 mm behind the reference plane |
| Maximum empty glider weight | |
| - without balancing weights | 350 kG |
| - with balancing weights (2x5.5 = 11.0 kg) | 361 kG |
| Maximum weight of non-lifting parts | |
| Fuselage without wings | 165 kG |
| Maximum flight weight | 530 kG |
| In-flight allowed range of CG position | 213 - 379 mm |
| Front instrument panel | 1580 mm in front of the reference plane |
| Balancing weights | 1520 mm in front of the reference plane |
| Pilot in the front seat | 950 mm in front of the reference plane |
| Rear instrument panel | 440 mm in front of the reference plane |
| Pilot in the rear seat | 60 mm behind the reference plane |
| Baggage | not allowed |
| Maximum wing surface load | 42.54 kG/m2 |
| Limit load factor | +7/-5 |
| Limit load factor in solo flight (pilot weight limited to 100 kg) | +9/-6 |
The first presentation of the glider took place at the World Championships in Venlo, the Netherlands, where Jerzy Makula won the World Championship flying on the MDM-1 Fox glider.
Since then, many medals at the World and European Championships have been won on Fox.
The glider is characterized by the possibility of increasing the span thanks to additional tips (Fox P version).
Fuselage
Monocoque sandwitch structure fuselage with integral vertical fin. Seat pans bonded permanently. Two-part cockpit canopy opening to the right.
In the nose of the fuselage total pressure port and vent air-intake, static pressure ports on both sides.
The vertical stabilizer has an on-board radio antenna laminated. The nose tow hook installed at the front part of the fuselage.
The winch launch CG hook installed in front of the main wheel.
Tail-plane
Horizontal stabilizer, elevator and rudder of sandwich structure, mass and aerodynamically balanced.
Control system
Mixed.
The rudder and tow hook are cable driven. The wheel brake has a cable-hydraulic drive.
Rudder and aileron have pushrod drive.
The elevator drive provided with spring trim adjusted by a lever at the base of the control stick in the front cabin.
When assembling wings and horizontal tailplane, the controls for aileron and air-brakes as well as the elevator are connected automatically. In the leading edge of the vertical fin the TE probe port is provided.
Landing gear
Main and tail wheel fixed, profiled. Main wheel brake coupled with aerodynamic brakes.
See also
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