The Ultracraft Calypso is a Belgian designed and built really low-cost homebuilt microlight aeroplane. The first airframe of the Calypso, designed by Erik Reynders, was a one-seat ULM which flew first in October 1994. Construction of about 24 airframes of the Calypso in monoplace or biplace configuration started over the years, of which 14 were ready to fly in 2004. The homebuilt kits of the Calypso are produced by Ultracraft in Heusden-Zolder, Belgium. The homebuilt kit delivered to a customer includes a completed airframe, constructed out of welded chromemolybdenum steel tubes. This steel alloy makes the frame lighter than steels and absorb the shocks better; for the construction of the cockpit frame aluminium is used as, this is sore light and well more stiffly than chrome molybdenum steel and will thus less shocks absorb. Next to the steel alloy and aluminium used for the airframe and cockpit: composites as well as wood are used in and for the construction of the aircraft and its wings. As power-unit for the Calypso the homebuilder can choose out of a wide range of engines, including the 2-stroke Rotax 582 and the 4-stroke Rotax 912 engine. The wings of the Calypso can be folded, which reduces the needed parking space in the hangar.
The ICAO Aircraft Type Designator used for the Ultracraft Calypso 1a is ULAC (the general term used for Ultralight aircraft).

Construction of the Ultracraft Calypso 1a s/n 007 started in 1998 and the aircraft was registered OO-C77 in Belgium on 10 May 1999. The first flight of this airframe took place on 10 July 1999. The OO-C77 is powered by a 46hp 2-stroke Rotax 503 Single Carb Engine.
On 5 September 2004, Ultracraft Calypso 1a OO-77 was seen was seen at Ultraleicht Flugplatz Dankern near Haren (Ems) in Germany.

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