Vliegtuigbouw Sagitta 013
The 15m Standard class Sagitta (Arrow) sailplane was designed and built by Piet Alsema, who formed NV Vliegtuigbouw to put it into production at Teuge airfield, near Apeldoorn.
The single-seat Sagitta is of conventional all-wood construction with a large, sliding blown canopy giving the pilot, seated over the wing leading edge, all-round visibility. The canopy slides backward and can be fixed open in flight at several positions. The mid-set wooden wings have a single spar and a plywood leading edge torsion box and the plain ailerons are also of wood; the wing is fabric covered over 25% of its area. Air brakes of a special design operate on both the upper and lower wing surfaces. The fin and rudder is swept and the cantilever tailplane can be folded when the sailplane is towed in a trailer. All control surfaces connect automatically on assembly. A fixed monowheel with brake comprises the landing gear.
The Sagitta first flew in prototype form on 4 July 1960. It was followed on 24 November 1961 by the first of the production aircraft, designated Sagitta 2; some 20 being produced.
A 17m (55 ft 9 in span) development of the Sagitta, known as the Super Sagitta, was reported in the spring of 1964, this being very similar apart from the increase in wing and tail surface areas, but the Super Sagitta remained a project only.
Wing span: 15m / 49.2ft
Wing area: 11.98sq.m / 129sq.ft
Empty Weight: 215kg / 473lb
Payload: 105kg / 232lb
Gross Weight: 320kg / 705lb
Wing Load: 26.71kg/sq.m / 5.46lb/sq.ft
Water Ballast: 0
MinSink: 0.64 m/s / 2.1 fps / 1.24 kt
Aspect ratio: 18.7
Airfoil: NACA 63-618
Structure: wood/ fabric wings and tail, wood fuselage
Span: 49 ft 2.5 in
Length: 21 ft 2.75 in
Height: 3 ft 11 in
Wing area:129.2 sq ft
Empty weight:478 lb
Max weight: 705 lb
Max speed:168 mph
Min sinking speed:2.1 ft/sec at 48 mph
Best glide ratio:37:1 at 60 mph