EASA Type-Certification for EB29D
The racing-two-seater EB29D
Among our clients arose the idea of a self launching glider with an electric(E)-engine which ideally would combine the performance of the EB29 with a seat for a Co-pilot.
Based on the single seater EB29 we stretched the fuselage in the cockpit area by only 25cm and increased the width by a few centimeters to generate the room for a Co-pilot. In addition we redesigned the complete control mechanism in the cockpit area in order to assure comfortable seating positions for the pilots in this very slim and elegant fuselage together with an ergonomic cockpit layout.
So the EB29 was transformed into the EB29D, a self launching racing-two-seater which truly defines a new benchmark.
The new EB29D made its maiden flight on May 28th 2013 on the airstrip of Büchig near Ostheim vor der Röhn, its E-Version EB29DElektro already in November 2012.
in a nutshell:
- low structural weight and high possible payload in the fuselage and as water ballast in the wings allows the utmost possible spread in wing loading
- optimized for best aerodynamics the edition-wing with new winglets makes higher cruise speeds as possible as superb slow speed capabilities
- variable wing span from 28.3 to 29.3 m, allows accomodation to various weather conditions by a simple change of the wingtips
- minimized drag due to the smaller wetted surface enables improved performance in comparison to the two-seater EB28
- comfortable handling in flight and on the ground due to the electric gear retraction, the 2-diameter main bolts for better wing assembly, the large and sprung wheel, the generous cockpit with forward hinged canopy, the optimized and ergonomically placed systems for engine operation, flaps and control system
- type certification according to CS-22, the highest safety standard for glider construction
See also Aerokurier Issue 7/2013
technical data
| wing span | 25,3 m | 28,3 m | |
| wing area | 15,4 m² | 16,5 m² | |
| aspect ratio | 41,6 | 48,5 | |
| fuselage length | 8,32 m | 8,32 m | |
| hight (fin plus tail wheel) | 1,76 m | 1,76 m | |
| emty mass with minimal equipment | ca. 570 kg | ca. 580 kg | |
| maximum ramp weight | 850 kg | 850 kg | |
| wingloading minimum | ca. 43,8 kg/m² | ca. 41,0 kg/m² | |
| wingloading maximum | 55,2 kg/m² | 51,5 kg/m² | |
| maximum speed | 280 km/h | 280 km/h | |
| best glide ratio | ca. 63 | ca. 66 | |
| Solo engine | ca. 64 PS | ca. 64 PS | |
| FRP-prop Binder BM-G1 | d 1,6 m | d 1,6 m | |
| rate of climb with engine (according ICAO standard athmosphere) | 2,6 m/s | 2,6 m/s | |
| cruise speed in powered flight | max.160 km/h | max.160 km/h | |
| max useable tank capacity (standard) | 20 ltr | 20 ltr | |
| Datasheet | EASA A.559 | EASA A.559 |
description
fuselage:
- body shell made of fibre reinforced plastic (CFK and aramide)
- cockpit suitable for pilots up to 190 cm in the front seat and little less in the rear seat
- forward swinging canopy including one sliding window with integrated ventilation scoop
- instrument panel moves upward with the canopy
- TOST-safety release couplings (for aero tow or winch tow)
- total pressure probe in tip of the fuselage nosecone
- adapter in the fin to fit TEK probe
- static pressure probes (for air speed indicator and altimeter) on both sides of the tail boom
cockpit:
- removeable bucket seats with parachute mould in the front seat
- safety belts
- seat cushions
- 2 side Pockets (rear seat)
- ram air entrance in the nosecone of the fuselage for ventilation and defogging of the canopy
- seperately controllable ventilation for both seats on right side of the cockpit
controls:
- rudder control pedals on linear rails (adjustable before flight)
- control rods made of CFK
- electrically adjustable trim with operating switches on both control sticks
- automatic elevator connection
landing gear and brake:
- rubber suspended, electrically operated retractable landing gear
- hydraulic disk brake
- tail wheel
power plant:
- power plant retractable into the fuselage
- solo engine 2625/2
- tooth belt driven reduction gear (1:3)
- water cooling
- double ignition
- electrical starter
- LiMg-batteries with 16,8 V max charching voltage for improved extension and retraction as well as starting of the engine
- engine control instrument fitted to the instrument panel
- Propeller Binder BM-G1-160-R-120-1
fuel tank:
- fuselage tank ~20 ltr
- flexible tank in inner wing ~17 ltr available
antenna:
- radio antenna in fin
wing:
- 8-part wing with boundry layer control on the lower wing surface
- wingtip with winglets for wingspan 25,3 m or 28.3 m
- built using high modulous (HM) carbon fibre
- aileron and flap gaps covered with Mylartape
- double panel air brakes on the upper wing surface
water ballast:
- water ballast bags in the outer wings ca. 50 ltr capacity each
- water ballast tank in the fin to allow for compensation of CG-movement using water ballast in the wings
finish
- white two component plyester coat or PU-coat
To minimize the structural weight the main parts of wing and fuselage are built using the vacuum suction method. This allows the utmost possible spread in wing loading.
