Delta no. 4 - Delta no. 4 - COSPAR 1961-Kappa 14,675 bytes. 156 x 433 pixels.

Commercial name for the military's Thor-Delta. The name of the Delta second stage eventually was applied to subsequent commercial follow-ons.

Launches: 12. Failures: 1. Success Rate: 91.67% pct. First Launch Date: 13 May 1960. Last Launch Date: 18 September 1962. Payload: 45 kg. to a: Geosynchronous transfer trajectory. Liftoff Thrust: 68,040 kgf. Total Mass: 54,050 kg. Core Diameter: 2.4 m. Total Length: 31.0 m. Flyaway Unit Cost $: 7.27 million. in 1985 unit dollars.

• Stage Number: 1. 1 x Thor DM-19 Gross Mass: 49,340 kg. Empty Mass: 3,125 kg. Thrust (vac): 77,367 kgf. Isp: 282 sec. Burn time: 165 sec. Isp(sl): 248 sec. Diameter: 2.4 m. Span: 2.4 m. Length: 18.4 m. Propellants: Lox/Kerosene No Engines: 1. LR-79-7

• Stage Number: 2. 1 x Delta 104 Gross Mass: 4,472 kg. Empty Mass: 590 kg. Thrust (vac): 3,579 kgf. Isp: 278 sec. Burn time: 296 sec. Isp(sl): 0 sec. Diameter: 1.4 m. Span: 1.4 m. Length: 5.9 m. Propellants: Nitric acid/UDMH No Engines: 1. AJ10-104

• Stage Number: 3. 1 x Altair 1 Gross Mass: 238 kg. Empty Mass: 30 kg. Thrust (vac): 1,270 kgf. Isp: 256 sec. Burn time: 38 sec. Isp(sl): 233 sec. Diameter: 0.5 m. Span: 0.5 m. Length: 1.8 m. Propellants: Solid No Engines: 1. X-248

• Echo 1 Spacecraft: Echo. Payload: A-10. Mass: 56 kg.

• Echo 1 Spacecraft: Echo. Payload: A-11. Mass: 76 kg.

  Balloon; passively relayed TV and voice transmissions. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

• Tiros 2 Spacecraft: Tiros. Payload: Tiros B (A-2). Mass: 130 kg.

  Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

• Explorer 10 Spacecraft: P-14. Payload: P-14. Mass: 35 kg.

  Magnetic field data. Decay date suspect Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

• Tiros 3 Spacecraft: Tiros. Payload: Tiros C (A-3). Mass: 129 kg.

  Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

• Explorer 12 Spacecraft: EPE. Payload: EPE A (S-3). Mass: 38 kg.

  Radiation and solar wind data. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

• Tiros 4 Spacecraft: Tiros. Payload: Tiros D (A-9). Mass: 129 kg.

  Returned 32593 cloud cover photos. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

• OSO 1 Spacecraft: OSO. Payload: OSO A (S-16). Mass: 208 kg.

  Orbiting Solar Observatory; solar flare observations. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

• Ariel 1 Spacecraft: Ariel. Payload: UK 1 (S-51). Mass: 60 kg.

  Ionospheric studies; returned X-ray, ionospheric, cosmic ray data. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

• Tiros 5 Spacecraft: Tiros. Payload: Tiros E (A-50). Mass: 129 kg.

  Returned 58226 cloud cover images. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

• Telstar 1 Spacecraft: Telstar. Mass: 77 kg.

  First commercial comsat; active repeater. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

• Tiros 6 Spacecraft: Tiros. Payload: Tiros F2 (A-51). Mass: 127 kg.

  Returned 66674 cloud cover images. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

• 34 - Gatland, Kenneth, Missiles and Rockets, Macmillan, New York, 1975.
• 140 - Wilson, Andrew, Spaceflight, "Delta Digest", 1979, Volume 10, page 413.