Sud-Ouest Djinn

__NOTOC__ Infobox Aircraft
name=S.O.1221 Djinn


caption=
type=Light helicopter
manufacturer=Sud-Ouest
designer=
first flight=1953
introduced=
retired=
status=
primary user=French Army
more users=German Army
produced=
number built=178
variants with their own articles=The Sud-Ouest S.O.1221 Djinn is a French two-seat light helicopter designed and built by Sud-Ouest later Sud Aviation. The helicopter rotors were driven by compressed-air jets at the end of each blade.

Development

Experience with the earlier Ariel experimental tip jet helicopter led Sud-Ouest to develop a practical light helicopter the S.O.1221 Djinn. It did not use the same tip jet system but relied on compressed air being fed to the ends of the rotor blades. The Djinn was apart from the propulsion a conventional helicopter with a two-seat side-by-side cabin with a Turbomeca Palouste turbo-compressor behind. The aircraft had an uncovered tail-boom with a twin fins and a rudder, because of the non-torque rotor propulsion it did not need an anti-tourque tail rotor. A prototype (designated S.O.1220) first flew on 2 January 1953 it was a simple uncovered structure with an exposed seat for the pilot. This proved the viability of the propulsion system and five two-seat prototypes were then built as the S.O.1221, the first flew on 16 December 1953. Within a few days the helicopter had climbed to an altitude of 4789m (15,712 ft) to establish a record in its class.

The French Army encouraged the building of a pre-production batch of 22 helicopters for evaluation. The first pre-production aircraft flew on 23 September 1954. Three of these pre-production helicopters were acquired by the United States Army for evaluation as the YHO-1. The French Army ordered 100 helicopters and six were bought by the German Army. The French Army used the helicopter for liaison, observation, training, and with one-pilot and two external litters for casualty evacuation.

Production ended in the mid-1960s after 178 Djinns had been built, some helicopters were sold to civil operators for agricultural use fitted with chemical tanks and spray bars.

Operators

;FRA:French Army;GER:German Army;USA:United States Army

pecifications

aerospecs
ref=* The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 2975
met or eng?= met

crew=Two
capacity=
length m=5.30
length ft=17
length in=4½
span m=
span ft=
span in=
swept m=
swept ft=
swept in=
rot number= 1
rot dia m= 11
rot dia ft= 36
rot dia in= 1
dia m=
dia ft=
dia in=
width m=
width ft=
width in=
height m=2.6
height ft=8
height in=6¼
wing area sqm=
wing area sqft=
swept area sqm=
swept area sqft=
rot area sqm= 95.03
rot area sqft= 1022.96
volume m3=
volume ft3=
aspect ratio=
empty weight kg=360
empty weight lb=704
gross weight kg=800
gross weight lb=1764
lift kg=
lift lb=

eng1 number=1
eng1 type=Turbomeca Palouste IV turbo-compressor
eng1 kw= 179
eng1 hp= 240
eng1 kn=
eng1 lbf=
eng1 kn-ab=
eng1 lbf-ab=
eng2 number=
eng2 type=
eng2 kw=
eng2 hp=
eng2 kn=
eng2 lbf=
eng2 kn-ab=
eng2 lbf-ab=

max speed kmh=130
max speed mph=81
max speed mach=
cruise speed kmh=
cruise speed mph=
range km=
range miles=
endurance h= 2
endurance min= 15
ceiling m=
ceiling ft=
glide ratio=
climb rate ms=
climb rate ftmin=
sink rate ms=
sink rate ftmin=

armament1=
armament2=
armament3=
armament4=
armament5=
armament6=

aircontent
related= *Tip jet
similar aircraft=
lists=

References

* The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 2975