In March 1957 an Aerojet engineer conceived of the 'ultimate Aerobee', with the body diameter increased to 46 cm diameter and powered by four engines. The design found no takers until it was pitched to NASA in 1961 and development was authorised. The final configuration selected used a Nike Ajax missile booster, 56 cm in diameter, followed by the Aerobee 350, equipped with 4 Aerobee 150A engines. The rocket could take 65 kg to 480 km altitude or 455 kg to 240 km altitude. NASA funded the rocket in FY 1964, and the first test with a live booster and dummy upper stage took place at Wallops Island on 11 December 1964. The first all-up flight took place on 18 June 1965 and a total of twenty were subsequently flown. The 2 stage vehicle consisted of 1 x Nike + 1 x AJ60-91

From NASA SOUNDING ROCKETS, 1958-1968 - A Historical Summary, NASA SP-4401, 1971, by William R. Corliss

Late in 1961 Aerojet submitted a proposal to NASA for the development of a new member of the liquid-fueled Aerobee series, the Aerobee 350. Goddard let the development contract to Aerojet in 1962 and assigned John H. Lane as Project Manager at Goddard. The 350 was a large Aerobee, consisting of a Nike booster plus a cluster of four Aerobee 150 engines with another 150 as the upper stage. It could launch 227 kg (500 lb) to about 340 km (210 mi) and was designed specifically to give instruments a "soft ride " The Aerobee 350 also incorporated a sophisticated attitude-control system that could select several astronomical targets during flight. The first test of the first "all-Goddard" rocket took place on December 11, 1964, at Wallops Island, when the booster stage was tested successfully with a dummy second stage. The purpose of the test was to check compatibility between the new rocket and the Aerobee launch tower at Wallops. The first complete system test of the Aerobee 350 was successful at Wallops Island on June 18, 1965.

Manufacturer: Aerojet. Launches: 20. First Launch Date: 1964-12-11. Last Launch Date: 1984-05-09. Launch data is: complete. Payload: 227 kg (500 lb). Apogee: 450 km (270 mi). Liftoff Thrust: 217.000 kN (48,783 lbf). Total Mass: 3,839 kg (8,463 lb). Core Diameter: 0.56 m (1.83 ft). Total Length: 15.90 m (52.10 ft). Span: 2.30 m (7.50 ft).

1964 December 11 - 18:00 GMT - Launch Site: Wallops Island. Launch Vehicle: Aerobee 350. LV Configuration: Aerobee 350 NASA 12.02GT.

• Dummy sustainer Test mission Nation: USA. Agency: NASA. Apogee: 2.00 km (1.20 mi). References: 1570.

• Test mission Nation: USA. Agency: NASA. Apogee: 374 km (232 mi). References: 1570.

• Test/Ionosphere-solar mission Nation: USA. Agency: NASA. Apogee: 358 km (222 mi). References: 1570.

• Plasma mission Nation: USA. Agency: NASA. Apogee: 271 km (168 mi). References: 1592.

• Astronomy/Test mission Nation: USA. Agency: NASA. Apogee: 88 km (54 mi). References: 1592.

• ECHO I Plasma mission Nation: USA. Agency: NASA. Apogee: 350 km (210 mi). References: 1592.

• Crab polarization X-ray Astronomy mission Nation: USA. Agency: NASA. Apogee: 196 km (121 mi). References: 1592.

• Aeronomy mission Nation: USA. Agency: NASA. Apogee: 300 km (180 mi). References: 1592.

• Astronomy mission Nation: USA. Agency: NASA. Apogee: 300 km (180 mi). References: 858.

• HI HI STAR Infrared Astronomy mission Nation: USA. Agency: AFCRL. Apogee: 111 km (68 mi). References: 780.

• Astronomy mission Nation: USA. Agency: NASA. Apogee: 237 km (147 mi). References: 1592.

• Astronomy mission Nation: USA. Agency: NASA. Apogee: 253 km (157 mi). References: 1592.

• Astronomy mission Nation: USA. Agency: NASA. Apogee: 214 km (132 mi). References: 1592.

• Infrared Astronomy mission Nation: USA. Agency: USAF CRL. Apogee: 286 km (177 mi). References: 780.

• X-ray Astronomy mission Nation: USA. Agency: NASA. Apogee: 221 km (137 mi). References: 1592.

• SAO X-ray Astronomy mission Nation: USA. Agency: NASA. Apogee: 232 km (144 mi). References: 1592.

• HI STAR Infrared Astronomy mission Nation: USA. Agency: USAF GL. Apogee: 257 km (159 mi). References: 780.

• NRL Mk II UV Camera Ultraviolet Astronomy mission Nation: USA. Agency: NASA. Apogee: 300 km (180 mi). References: 931.

• Astronomy mission Nation: USA. Agency: NASA. Apogee: 300 km (180 mi). References: 931.

• X-ray Astronomy mission Nation: USA. Agency: NASA. Apogee: 300 km (180 mi). References: 931.

• McDowell, Jonathan, Jonathan's Space Home Page, Harvard University, 1997-present. Jonathan McDowell's complete on-line listing of all objects orbited and over 20,000 rocket launches Accessed at: http://www.planet4589.org/jsr.html.

• Alway, Peter, Rockets of the World, Saturn Press, Ann Arbor, 1995. ISBN: 0962787655. Comprehensive account of world rocketry, from the beginning 'til now, from sounding rockets to Saturns. Oriented toward rocket modellers, with accurate drawings and color guides. More at amazon.com...