Delta M

Delta M
Launch history
Launch of the first Delta M with Intelsat 301
Function	Expendable launch system
Country of origin	United States
Status	Retired
Launch sites	Cape Canaveral LC-17A
Total launches	13
Successes	11
Failures	2
First flight	18 September 1968
Last flight	17 March 1971

The Delta M or Thor-Delta M was an American expendable launch system used for thirteen orbital launches between 1968 and 1971. It was a member of the Delta family of rockets.

The Delta M had a three-stage configuration. The first stage was the Long Tank Thor, a stretched version of the Thor missile, previously flown on the Delta L. Three Castor-2 solid rocket boosters were attached to the first stage to increase thrust at lift-off. A Delta E was used as the second stage, and the third stage was a Star-37D solid rocket motor. On the final flight, six boosters were flown instead of three, in a configuration known as the Delta M6, or "Super Six".

All thirteen launches were made from Launch Complex 17A at the Cape Canaveral Air Force Station. The first launch (carrying Intelsat 301) on September 18, 1968 was a complete failure when the first stage began suffering abnormal pitch gyrations starting at T+20 seconds. The booster maintained a stable attitude until around T+100 seconds when it pitched over and began to break up from structural loads. As the Delta was also headed back towards land, Range Safety sent the destruct signal at T+108 seconds. The fifth launch on July 25, 1969 (Intelsat 305) suffered a rupture of either the third stage casing or nozzle and ended up in an unusable orbit. Of the thirteen launches, twelve carried geosynchronous communications satellites. The thirteenth, which was the final flight and the only one in the M6 configuration, placed Explorer 43 into a highly elliptical orbit.

References

Wade, Mark. "Delta". Encyclopedia Astronautica. Retrieved 2009-02-11.
Krebs, Gunter. "Thor family". Gunter's Space Page. Retrieved 2009-02-11.

Orbital launch systems

See also: Comparison of orbital launch systems

Current	Angara 1.2 A5 Antares 200 Ariane 5 Atlas V Delta II IV Dnepr Epsilon Falcon 9 v1.2 "Full Thrust" GSLV H-IIA H-IIB Kuaizhou Long March 2C 2D 2F 3A 3B 3C 4B 4C 5 6 7 11 LVM3 Minotaur I IV V C Pegasus Proton-M PSLV Rokot Safir Shavit Simorgh Soyuz U FG Soyuz-2 2.1a / STA 2.1b / STB 2-1v Strela Unha Vega Zenit 3SL 3SLB 3F

In development	Angara A5P A5V Antares 300 Ariane 6 Electron Falcon 9 "Block 5" Falcon Heavy Firefly α H3 ITS KZ-11 KZ-21 Long March 8 9 LauncherOne Mayak Naga-L Naro-2 New Glenn Orel Proton Light Medium RPS SLS Soyuz-5 SPARK SS-520 Tronador II Tsyklon-4 ULV VLM Vulcan

Retired	Antares 100 Ariane 1 2 3 4 ASLV Athena I II Atlas B D E/F G H I II III LV-3B SLV-3 Able Agena Centaur Black Arrow Conestoga Delta A B C D E G J L M N 0100 1000 2000 3000 4000 5000 III Diamant Energia Europa Falcon 1 Falcon 9 v1.0 v1.1 Feng Bao 1 H-I H-II Juno I Juno II Kaituozhe-1 Kosmos 1 2I 3 3M Lambda 4S Long March 1 2A 2E 3 4A Mu 4S 3C 3H 3S 3SII V N1 N-I N-II Naro-1 Paektusan Pilot Proton UR-500 K R-7 Luna Molniya M L Polyot Soyuz original L M U2 Soyuz/Vostok Sputnik Voskhod Vostok L K 2 2M R-29 Shtil' Volna Saturn I IB V INT-21 Scout SLV Space Shuttle Sparta Start-1 Thor Able Ablestar Agena Burner Delta DSV-2U Thorad-Agena Titan II GLV IIIA IIIB IIIC IIID IIIE 34D 23G CT-3 IV Tsyklon 2 3 Vanguard Zenit 2 2M

United States orbital launch systems

Active	Antares Atlas V Delta II IV Heavy Falcon 9 Full Thrust Minotaur I IV V C Pegasus

In development	Athena Ic IIc III Falcon Heavy ITS New Glenn SLS SPARK Vulcan

Retired	Ares I V Athena I II Atlas B D E/F G H I II III LV-3B SLV-3 Able Agena Centaur Conestoga Delta A B C D E G J L M N 0100 1000 2000 3000 4000 5000 III Falcon 1 Falcon 9 v1.0 v1.1 H-I* Juno I Juno II N-I* N-II* Pilot Saturn I IB V INT-21 Scout Shuttle Sparta Thor Able Ablestar Agena Burner Delta DSV-2U Thorad-Agena Titan II GLV IIIA IIIB IIIC IIID IIIE 34D 23G CT-3 IV Vanguard

* - Japanese projects using US rockets or stages

Thor and Delta rockets

Rockets

Thor

Delta

Alphabetical	Delta A Delta B Delta C Delta D Delta E Delta F Delta G Delta J Delta L Delta M Delta N

Numerical	Delta 0100 Delta 1000 Delta 2000 Delta 3000 Delta 4000 Delta 5000 Delta 6000 Delta 7000 Delta 8000 Delta 9000

Modern	Delta II Delta III Delta IV

Export

Launch sites

Canaveral	(S)LC-17 LC-18B SLC-37B

Johnston	LE-1 LE-2

Tanegashima	Osaki

Vandenberg	SLC-1 SLC-2 SLC-3 SLC-6 SLC-10

Bases	Bardney Breighton Caistor Carnaby Catfoss Coleby Grange Driffield Feltwell Folkingham Full Sutton Harrington Hemswell Ludford Magna Melton Mowbray Mepal North Luffenham North Pickenham Polebrook Shepherds Grove Tuddenham

Components

Boosters

First stages

Common Booster Core

Upper Stages

Delta	Delta-A Delta-D Delta-E Delta-F Delta-K Delta-P DCSS

Other	Able Ablestar Agena Altair Burner FW-4D IABS PAM-D Star UM-129

Engines

Manufacturers

Rocket	Douglas McDonnell Douglas Boeing United Launch Alliance

Engines	Aerojet Alliant Rocketdyne Thiokol TRW

Launches

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