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Civil Aviation Department of India RG-1 Rohini
Aeronautical Services Ltd RG-1 Rohini
Veegal Engines and Engineering Co RG-1 Rohini
Hindustan Aeronautics RG-1 Rohini
 
RG-1- Rohini
 
In the early 1960s S Ramamritham designed a two-seat training sailplane, the RG-1 Rohini, the first (built by Aeronautical Services Ltd RG-1) of four prototypes flying on 10 May 1961. The four prototypes were built between 1961 and 1964 at the Technical Centre of Civil Aviation. The Rohini is the second two-seat glider to be designed and built in India.
 
To minimise production costs the Rohini uses a number of components identical to those on the Ashivini II including the tail surfaces, wing ribs and air brakes. The Ashivini is a tandem two-seater while the Rohini has its seating arranged side-by-side. Of all-wood construction, the Rohini has a braced high wing which is a two-spar structure, plywood-covered to the rear spar and with a fabric-covered trailing edge; the fabric-covered wooden ailerons have plycovered leading edges, and there are air brakes above and below the wing on each side. The fuselage is built as a one-piece structure with integral fin, the forward portion to the wing rear spar attachment and the rear portion aft of the tailplane front attachment bulkhead being plywood-covered wooden semi-monocoques, whereas the remaining centre and rear portions have a fabric-covered wooden girder structure. The cantilever wooden tail has a plywood-covered fin and fabric-covered rudder, tailplane and elevators except for the leading edges and that part of the tailplane between the two root ribs, which are ply-covered. There is a trim tab in the starboard elevator. The landing gear consists of a non-retractable unsprung Dunlop monowheel and tyre, with no brake, and a rubbersprung nose skid under the forward fuselage with a replaceable steel shoe; there is a spring steel tail skid. The two pilots sit side-by-side in an open cockpit with small windshields.
 
Since the Centre does not undertake quantity production of its gliders, but supplies complete sets of drawings of its designs to any firms interested in manufacturing them, the Rohini went into production elsewhere. A total of 17 Rohinis were built by Veegal Engines and Engineering of Calcutta, with Hindustan Aeronautics Limited building a further 86 RG-1s by 1971 at its Kanpur Division. At least 107 were built in total.

 

RG-1 Rohini 1
Wing span: 16.56 m (54 ft 4 in)
Length: 8.17 m (26 ft 9.5 in)
Height: 2.33 m (7 ft 7.25in)
Wing area: 20.76 m2 (223.5 sq ft)
Wing section: NACA 4418/4412
Aspect ratio: 13.2
Airfoil: NACA 4418 at root, NACA 4412 (modified) at tip
Empty weight: 274 kg (604 Ib)
Max weight: 494 kg (1,089 Ib)
Water ballast: None
Max wing loading: 23.76 kg/m2 (4.86 lb/sq ft)
Never exceed speed: 184 km/h (114 mph; 99 kn)
Stalling speed: 26 kt / 30 mph/ 48 km/h
Aerotow speed: 112 km/h (69.6 mph; 60.5 kn)
Winch launch speed: 96 km/h (59.7 mph; 51.8 kn)
g limits: +5 -2.5
Min sinking speed: at 33 kt (61 km/h) 0.85 m (2.8 ft)/sec
Max rough air speed: 65 kt (120 km/h)
Best glide ratio: at 41.5 kt (77 km/h) 22
Maximum glide ratio: 21:1 at 77 km/h (47.8 mph; 41.6 kn)
Rate of sink: 0.85 m/s (167 ft/min) at 61 km/h (37.9 mph; 32.9 kn)
Crew: 2
 
RG-1- Rohini-ld
 

 

 
 
 
 
 
 
 
 
 


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