The design of the Móka was started in 1937, a year after the first flights of the German DFS Habicht, one of the earliest fully aerobatic gliders, and was rather similar in appearance though different in construction.
[1] The R-17b, redesigned to lower mass as well as improve handling with new ailerons, was built by Aero-Ever Ltd's successor, Sportárutermelő Vállalat (Sporting Goods Factory).
When test flown the R-17b showed aileron flutter, not experienced with the R-17, which was strong enough to wrest the control stick from the pilot causing a crash.
Its pilot was killed pulling out of a high speed dive, when strong aileron flutter resulted in wing breakup.
The outer trailing edges carried balanced, slotted, differential ailerons which could be lowered together by 5° for slower landings.
The pilot sat just ahead of the leading edge in an open cockpit which had a removable cover with built-in windscreen.
Narrow, parallel chord tailplanes were mounted just above the fuselage and braced from below by a single strut on each side.