The RRG Fafnir, named after the legendary dragon, was a single seat German high performance glider designed by Alexander Lippisch.

The single wing spar had to be deep for strength and Lippisch accommodated this by using the Göttingen 652 airfoil which is thick and strongly cambered, additionally providing lift at low speeds.

[1] The Fafnir had only just begun test flights at the start of the Rhön competition held in August 1930, when wing root turbulence was found to reduce performance.

After this was rapidly reduced by the addition of shaped balsa blocks at the cockpit-leading edge junction the glider, piloted by Günther Groenhoff, had some success, sharing a new record out and return flight of 30 km (19 mi) with Robert Kronfeld.

[1] Repaired and with a lengthened and glazed cockpit, the Fafnir was flown on some notable flights in 1933, including one of over 228 km (142 mi) from Darmstadt to France and others above Berlin.

On return, it continued to fly from its Darmstadt home until retired to a Berlin museum, where it was destroyed by bombing in World War II.