Algol (rocket stage) explained

Algol
Mass:1900kg (4,200lb)
Function:Rocket stage
Height:9.4m (30.8feet)

The Algol family of solid-fuel rocket stages and boosters is built by Aerojet (now Aerojet Rocketdyne) and used on a variety of launch vehicles. It was developed by Aerojet from the earlier Jupiter Senior and the Navy Polaris programs.[1] [2] Upgrades to the Algol motor occurred from 1960 until the retirement of the Scout launch vehicle in 1994.

The Algol family use solid propellant fuel with a loaded mass of 10,705 kg, and produces 470.93 kN of thrust. The motor has a specific Impulse of 236 seconds in a vacuum environment. Variations Algol I, I-D, II, II-A, II-BA popular rating was 40KS-115,000 (52,000 kgf for 40 seconds), also known as Senior.

They were initially developed as the first-stage of propulsion for the Scout rocket, with the design being based on the UGM-27 Polaris, a submarine-launched ballistic missile developed for the United States Navy at the Jet Propulsion Laboratory.[3] [4]

Algol 1 (XM-68)

Algol 1 (XM-68)This rocket design started as the Polaris test motor, 31 feet in length with a 40inches diameter steel case, and 86,000 lbf of thrust.The eventual UGM-27 Polaris A-1 was larger, 28.5feet in length and 54inches in diameter.[5]

The Algol 1 was first used for a successful suborbital launch of a Scout X-1 rocket on September 2, 1960.[6] The rocket started as a UGM-27 Polaris test motor with a 40-inch diameter, the largest solid motor ever tested at the time. It had a nominal performance rating of 40 seconds duration and 45,000 kgf thrust. It was 19.42feet long, 2.6feet in diameter.[7] Later versions for Scout D scaled to 1.14m (03.74feet) in diameter.

Algol 1-AUsed on the Scout X (Cub Scout) test flight flown April 18, 1960. served as prototype vehicle for eventual Scout rocket.
Algol 1-BUsed on Scout X-1, RM-89 Blue Scout I, and RM-90 Blue Scout II.
Algol 1-CUsed on the Scout X-1A. After this single flight, the Scout X-2 with Algol 1-D replaced this prototype.
Algol 1-DUsed with Scout X-2, Scout X-2M and Little Joe II. Solid rocket stage. 440.00 kN (98,916 lbf) thrust. Mass 10700kg (23,600lb).It was first used on the Scout X-2 on March 29, 1962. It continued to be used on Scout X-2 and Scout X-2M launches (4) until 1963.Algol 1-D was first used on the Little Joe II Qualification Test Vehicle in 1963.

May 13, 1964 – Algol Boosts Little Joe II A-001 flight.An Aerojet-built Algol 1D heavy-duty rocket motor performed successfully for the 36th consecutive time on May 13, 1964, as it carried a NASA Little Joe II spacecraft on the Apollo program A-001 test flight. Averaging 96,650 pounds thrust, the Algol 1D was the largest solid rocket motor flying in non-military space programs. Test hardware on May's successful Apollo test flight included: an unmanned instrumented command module, service module, launch escape system and the Little Joe II launch system.

Algol engine used on Little Joe IIThrust: 465 kN eachLength: 9.1 mDiameter: 1 mWeight full: 10,180 kgWeight empty: 1,900 kgFuel: solidBurn time: 40 s

Status: Retired 1966. Gross mass: 10700kg (23,600lb). Unfuelled mass: 1200kg (2,600lb). Height: 9.4m (30.8feet). Diameter: 1.02m (03.35feet). Thrust: 440.00 kN (98,910 lbf). Burn time: 44 s. Number: 20.

Algol II

The Algol 2 (Algol II) series was first flown in 1962.It was used a first stage on Scout A, Scout B, Scout X-3, Scout X-4; It was proposed as a strap-on motor for the Titan 3BAS2 variant (cancelled). It was also proposed for the Athena RTX program in 1969, losing to Thiokol. B-165488, JAN. 17, 1969. Thrust (sl): 513.300 kN (115,394 lbf; 52,347 kgf).

The 3BAS2 configuration of Titan 3B rocket proposed by Martin in the mid-1960s would have been used for deep space missions with a Centaur upper stage, Algol strap-on for liftoff thrust augmentation. It was never flown.

CSD solid rocket engine. 564.2 kN. Isp=255s. Gross mass: 11600kg (25,600lb). Unfuelled mass: 1650kg (3,640lb). Height: 9.09m (29.82feet). Diameter: 1.01m (03.31feet). Thrust: 564.20 kN (126,837 lbf). Specific impulse: 255 s. Specific impulse sea level: 232 s.

The Algol II-A was introduced in 1963 using the Aerojet 40 KS motor. It first flew on Scout-X3 in 1963.

The Algol II-B was created after an Algol II-A flight failure, the nozzle was designed and designate the II-B model. It first flew on Scout-X4

The Algol II-C flew on Scout A1 and B1. Scout-A2, -B2, -C and -2 versions planned for Algol II-C were never used.

See also

Notes and References

  1. Book: Hammond, Walter . Space Transportation: A Systems Approach to Analysis and Design . American Institute of Aeronautics and Astronautics . 1999 . 978-1-56347-032-5 . Reston, VA . 10.2514/4.862380.
  2. Web site: Scout Launch Vehicle Program . NASA.
  3. Web site: NASA'S SCOUT LAUNCH VEHICLE . NASA GSFC . dead . https://web.archive.org/web/20080510104748/http://www.gsfc.nasa.gov/gsfc/service/gallery/fact_sheets/general/scout.htm . 2008-05-10 .
  4. Web site: SERGEANT . Redstone Arsenal . dead . https://web.archive.org/web/20080612022555/http://www.redstone.army.mil/history/systems/sergeant.html . 2008-06-12 .
  5. Web site: Polaris A1. May 30, 1997. Federation of American Scientists. April 1, 2023.
  6. Web site: TSE – Scout . The Satellite Encyclopedia.
  7. Web site: Algol-1. astronautix.com. April 1, 2023.