Rocketdyne E-1

Rocketdyne's E-1 was a liquid propellant rocket engine originally built as a backup design for the Titan I missile. While it was being developed, Heinz-Hermann Koelle at the Army Ballistic Missile Agency (ABMA) selected it as the primary engine for the rocket that would emerge as the Saturn I. In the end, the Titan went ahead with its primary engine, and the Saturn decided to use the lower-thrust H-1 in order to speed development. The E-1 project was cancelled in 1959, but Rocketdyne's success with the design gave NASA confidence in Rocketdyne's ability to deliver the much larger F-1, which powered the first stage of the Saturn V missions to the Moon.

History

Genesis

In July 1954 the Air Force Scientific Advisory Board's ICBM working group advised the Western Development Division (WDD) on their doubts about the Atlas missile that was then under development. Atlas used a number of unconventional features in order to meet its performance goals, and they felt that there was undue risk that if any of these proved unworkable in practice then the entire design would fail. The group suggested that a second ICBM project be started as a risk mitigation effort.

E1

E1, E01, E.I or E-1 may refer to:

Transport

Trains and locomotives

Aircraft

Submarines

Roads

U.S. uniformed services pay grades

Pay grades are used by the uniformed services of the United States to determine wages and benefits based on the corresponding military rank of a member of the services. While different titles or ranks may be used among the seven uniformed services, pay grades are uniform and equivalent between the services and can be used to quickly determine seniority among a group of members from different services. They are also essential when determining a member's entitlements such as basic pay and allowances.

Pay grades are divided into three groups: enlisted (E), warrant officer (W), and officer (O). Enlisted pay grades begin at E-1 and finish at E-9; warrant officer pay grades begin at W-1 and finish at W-5; and officer pay grades begin at O-1 and finish at O-11. Not all of the uniformed services use all of the grades; for example, the Navy does not use the grade W-1, the Air Force discontinued use of the warrant grades in the 1960s, and both the Public Health Service and National Oceanic and Atmospheric Administration do not use any of the enlisted or warrant grades.

E1 (Jerusalem)

The E1 zone (sometimes E-1 zone) or E1 area or E1 (short for East 1) (Hebrew: מְבַשֶּׂרֶת אֲדֻמִּים) is an area of the West Bank within the municipal boundary of the Israeli settlement of Ma'ale Adumim. It is located adjacent to and northeast of East Jerusalem and to the west of Ma'ale Adumim. It covers an area of 12 square kilometres (4.6 sq mi), which is home to a number of Bedouin communities and their livestock as well as a large Israeli police headquarters. The Palestinian tent site of Bab al Shams, which was established for several days in early 2013, also lay within this area.

There are Israeli plans for construction in E1, named the E1 Plan, frozen since at least 2009 under international pressure. This plan is not synonymous with the expansion of Ma'ale Adumim. The plan was initially conceived by Yitzhak Rabin in 1995.

Construction in E1 is controversial. Critics say that the plan aims at preventing any possible expansion of East Jerusalem by creating a physical link between Ma'ale Adumim and Jerusalem, and that it would effectively complete a crescent of Israeli settlements around East Jerusalem dividing it from the rest of the West Bank and its Palestinian population centres, and create a continuous Jewish population between Jerusalem and Ma'ale Adumim. It would also nearly bisect the West Bank jeopardizing the prospects of a contiguous Palestinian state. Palestinians describe the E1 plan as an effort to Judaize Jerusalem.