ELA-7 (-7) "Albatros" experimental ground effect aircraft by SKB KnAPI ( )

General Information
Type ELA-7 (-7)
Function Experimental hydroplane
Year 1971
Crew 1
Type MT-8
Power 32hp
Length ?m
Height ?m
Wingspan ?m
Wing area 14m2
Weights and loads
Empty ?kg
Loaded 430kg
Wing Load (kg/m2) 30.7
Power load (kg/hp) 13.4
taxi 36km/h
ELA-7 photo from Russian Aviation

One of the first ultra-light projects of the SKB KnAPI ( ), started in 1968. Group lead by designers A.I.Nikitin, V.P.Kotliarov and V.V.Frolov included number of KnAPI students, who participated in design and construction of the aircraft.

Group studied variety of ultra-light hydroplane schemes, and selected very unconventional one, resembling R.L.Bartini VVA-14 and KOR.SVVP-70. ELA-7 was built around large rectangular center wing section, enclosed between catamaran-style floats. Trailing edge of the center section was extended by small outer wing sections, carrying ailerons. Leading edge of the center section carried a pilot-controlled flap, used to re-direct part of the propeller flux and oncoming air flow under the wing (dynamic augmentation of the air cushion). Trailing edge also carried a flap used to regulate air flow.

Engine was installed on the leading edge, ahead of the wing. Cockpit was located in the extension of the engine nacelle. Twin tailboom carried V-shaped tail.

Aircraft was built of wood, with almost 100% plywood skinning.

Trials were carried out during Summer 1971, on the Mylki lake not far from Komsomolsk-on-Amur. Insufficient power and low efficiency of propeller did not allow ELA-7 to accelerate above 36km/h. Most of trials were concentrated on the air cushion effect. Additional lift of 100kg created by combined wing-in-ground and air cushion effects was observed.

This was considered a success by the team, and they started another project with improved airdynamics.

? ELA-8
  • .., ..
  • Links
  • ELA-7 at Russian Aviation

  • Created August 27, 2001 Back to
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