General Aircraft Monospar ST-25

The Monospar ST-25 was a low-wing cantilever monoplane with a fabric-covered metal structure. The monospar name came from the use of a single spar in the wing structure, that had been developed by H J Stieger. The cabin was enclosed with five seats. It was based on the GAL Monospar ST-10, with the addition of a folding seat for a fifth passenger, extra side windows, and the addition of a radio receiver. On 19 June 1935, the prototype (G-ADIV) made its first flight at Hanworth Air Park. It was designated Monospar ST-25 Jubilee, to honour the 25th anniversary of the reign of King George V. ==Operational history==

• The last flying Monospar ST-25 (ZK-AFF), of Piet Van Asch, the owner of New Zealand Aerial Mapping Ltd, was lost in 1986 in a hangar fire. • The last surviving Monospar ST-25 (OY-DAZ), an ST-25 Ambulance, was fully restored during 1989–1999, and is now displayed in Egeskov Veteranmuseum at Egeskov Castle, Denmark. ==Variants==

;Monospar ST-25 Jubilee :(1935-1936) Single fin and rudder. 30 built. The GAL.41 flew for the first time on 11 May 1939, and was grounded in 1941. ==Operators==

; • Arabian Airways • Airlines WA ; • Armée de l'Air (2 ST-25 in Indochine (Vietnam) in November 1945) ; • Van Melle's Confectionery Works, Breskens (one Jubilee, PH-IPM "Dubbele Arend", delivered in 1935) ; • New Zealand Aerial Mapping • Royal New Zealand Air Force ; • Royal Romanian Air Force ; • Spanish Republican Air Force ; • Spanish Air Force ; • General Command of Mapping (Turkey) • Turkish Government (two ST-25 Freighters for parachute training delivered in 1937) ; • Crilly Airways • Utility Airways • Royal Aircraft Establishment (two Jubilees used for radio development) • Royal Air Force (impressed civil aircraft used during the second world war) ==Specifications (Monospar ST-25 Jubilee)==