The Viking Dragonfly MKII

The first 2 seater lightweight composite aircraft being electrified in the Netherlands

The Dragonfly is a two-seater aircraft that features a tandem wing layout with a forward wing mounted low and the other behind the cockpit in a shoulder position, a two-seats-in-side-by-side configuration enclosed cockpit under a bubble canopy, fixed landing gear and a single engine in tractor configuration.┬áThe aircraft is constructed from composites, based on construction techniques pioneered by Burt Rutan at Rutan Aircraft Factory (RAF). The airframe design is visually similar to the RAF’s Quickie 2, which was developed independently, but the Dragonfly has larger airfoils and was designed for a smaller engine, resulting in a slower but more docile handling aircraft. Origionally 60 hp (45 kW) Volkswagen air-cooled and 85 hp (63 kW) Jabiru 2200 four-stroke powerplants were used with the Dragonfly. With a redesign to a battery-electric variant (project DragonFly) Inholland and partners want to demonstrate the viability of electrifying existing small aircraft for the general aviation.

 

% completion of activities

  • Primary structure of the airplane 70% 70%
  • Primary Control Systems 75% 75%
  • Landing gear 85% 85%
  • Avionics design 60% 60%
  • Structural validation 10% 10%
  • Aerodynamics & Performance analysis 15% 15%
  • Airplane Digitalization by CAD activities 90% 90%
  • Proof of concept Mixed Reality application 80% 80%
  • Smart CAE simulation to speed up the design- and certification process 1% 1%
  • Electric propulsion design 1 50% 50%
  • Electric propulsion design 2 5% 5%

Specification target for project DragonFly

Geometry
LENGTH 5,8 mtr 19 ft
HEIGHT 1,3 mtr 4,2 ft
WINGSPAN 6,7 mtr 22 ft
WING AREA 9 m2 97 sq.ft
Electric propulsion
CONTINUOUS POWER 50 kW 67 hp
BATTERY CAPACITY 35 kWh
Performance reference
MTOW 522 kg 1151 lbs
EMPTY WEIGHT 277 kg 611 lbs
USEFUL LOAD 245 kg 540 lbs
GLIDE RATIO 14,5 :1
CLIMB RATE 4 m/s 787 fpm
MAX SPEED 280 kph 174 mph
VNE 311 kph 193 mph
CRUISE SPEED 260 kph 162 mph
MINIMUM SPEED 80 kph 48 mph
STALL SPEED 77 kph 50 mph
CEILING 5638 mtr 18500 ft
TAKE OFF DISTANCE 366 mtr 1200 ft
LANDING DISTANCE 610 mtr 2000 ft

 

This configuration is based on the Viking Dragonfly MK.II, an American amateur-built aircraft, designed by Bob Walters and produced by Viking Aircraft LLC of Elkhorn, Wisconsin. This aircraft was originally supplied as a kit for amateur construction. The Aviodrome in Lelystad got hold of a Dragonfly a long time ago as the original Dutch owner Mr. Thom Sijs agreed to store it at the museum, waiting for final assembly at a later stage. Now, many years later, it was decided that the Aeronautical Engineering faculty at the Inholland University of Applied Sciences would be a much better place to facilitate finalisation of the construction. With Inhollands ambition to play an active role in achieving sustainable aviation, the Aeronautical & Precision Engineering students, teachers, researchers and partners are looking forward to completing the build, fly emission-free, but more importantly, learn from this project and make sure the educational system will benefit greatly from the learnings.