Jongblood designed and built this primary glider in 1966, with assistance from Hugh Knoop. The design was original and includes an original airfoil design as well, designated as a Jongblood II section.^[1][2]

The aircraft is built from wood and covered in doped aircraft fabric covering. The glider has a detachable pod to cover the pilot or can be flown open cockpit. It has a constant chord wing with a 4 ft (1.2 m) chord and a 32.5 ft (9.9 m) span. The wing features dual parallel struts and jury struts, but has no spoilers or other glidepath control devices. The tailplane is also strut-braced. Unlike most earlier primary glider designs that land on a fixed skid, this aircraft has a fixed monowheel.^[1]

Only one was ever constructed.^[1]

The Primary had accumulated over 200 auto-tows and seven aerotows, along with nine hours of flying time, by the end of 1968 and by 1983 had flown 22 hours total. It had flown a single three-hour flight and had recorded a height gain of 8,000 ft (2,438 m).^[1]

By 1983 the aircraft was reported as being in storage. In May 2011 it was still on the Federal Aviation Administration registry listings, although its registration had expired on 31 March 2011.^[1][2]

Data from Soaring^[1]

General characteristics

• Crew: one
• Wingspan: 32 ft 6 in (9.91 m)
• Wing area: 125 sq ft (11.6 m²)
• Aspect ratio: 8:1
• Airfoil: Jongblood II
• Empty weight: 270 lb (122 kg)
• Gross weight: 450 lb (204 kg)

Performance

• Maximum glide ratio: 8:1 at 30 mph (48 km/h)

Aircraft of comparable role, configuration, and era

• Detroit G1 Gull
• Elliotts Primary EoN
• Sands Replica 1929 Primary Glider
• Schweizer SGP 1-1
• Slingsby Grasshopper
• Stamer Lippisch SG-38 Zögling

Related lists

• List of gliders