The strategy invests in new and/or upgraded commercial launch solutions that also meet National Security Space (NSS) requirements. The purpose of this paper is to describe the development of the EELV Standard Interface Specification (SIS) and its implications for spacecraft designers. %PDF-1.6 % That strategy was designed to (1) . 2774 0 obj <>/Filter/FlateDecode/ID[<250AE161C7F7FC4982A3B8062B0E51BA>]/Index[2762 23]/Info 2761 0 R/Length 79/Prev 495466/Root 2763 0 R/Size 2785/Type/XRef/W[1 3 1]>>stream 0000051223 00000 n The payload interface at each port has been standardized, allowing for hosted and separable payload inter-changeability, late payload integration, 0000076318 00000 n The procedure and process for development, control, and maintenance is the same for ICDs and ISs. Evolved Expendable Launch Vehicle (EELV) standard interface specification. "=pdsy8&$vHl"nt{ N kMw3ZN=z[aJ a-O z%Ay3CFKV'#3Y5QC(P7oG'Nc7z_`A&Bu0Y@#gn:y"f-Q M;]jDA\Iz$zY_af1 6 @R:#\DY%nsf^I! endobj DOD expects to spend about $9.5 billion over the next 5 years acquiring launch hardware and services through the program, during which time it will also be working to certify new launch providers. Category A payloads fit within a 4m diameter payload envelope, category B payloads fit within a 5m diameter payload envelope, and category C payloads require an extended 5m diameter envelope. 2023 Northrop Grumman. The Northrop Grumman name and logos are registered trademarks of Northrop Grumman. endstream endobj startxref Along with the award of two development agreements, the total amount was more than $3 billion. E6S2)212 "l+&Y4P%\%g|eTI (L 0_&l2E 9r9h xgIbifSb1+MxL0oE%YmhYh~S=zU&AYl/ $ZU m@O l^'lsk.+7o9V;?#I3eEKDd9i,UQ h6'~khu_ }9PIo= C#$n?z}[1 The EELV system included launch vehicles, infrastructure, support systems, and interfaces. 27 33 [2], Started in 1994 as the Evolved Expendable Launch Vehicle launch system program, the initial program goal was to make government space launches more affordable and reliable, leading to the development of the Boeing Delta IV and Lockheed Martin Atlas V EELV families. ( (ZY deZyo|-@#|Fd3C\5t In early 2016 the incumbent contractor, United Launch Alliance (ULA), decided not to compete for the first competitive launch opportunity under Phase 1A of EELV, which provides for the launch of a GPS III satellite. [25][26] The USAF certified the Falcon 9 in May 2015,[27] and in 2016 SpaceX won a contract under the EELV program to launch a GPS Block III satellite payload to MEO. [49] In the event, no phase 2 funding from the US government was forthcoming after August 2020 when ULA Vulcan and SpaceX were selected by the Air Force. endobj THE EVOLVED EXPENDABLE LAUNCH VEHICLE (EELV) STANDARD INTERFACE SPECIFICATION FOR SPACE VEHICLE ACCOMMODATIONS Frank L. Knight. 21 0 obj 0000006374 00000 n The Atlas V family uses a Russian RD-180 to power the first stage Common Core Booster. The ESPAStar platform leverages the available mass margin from any EELV launch to provide an affordable path to space for payloads. 0000006582 00000 n Delta IV Medium flew with two or four SRBs on a single Common Booster Core. The USAF and United States Space Force (USSF) plan to use the next generation NSSL launch vehicles until at least 2030.[31]. 0000461158 00000 n [10] The initial bids came from four major defense contractors: Lockheed Martin, Boeing, McDonnell Douglas, and Alliant Techsystems. The USAF began the EELV program in 1994, following many years of government-funded studies into improved systems and architecture. It uses 457,295 lbs (207,425 kg) of liquid oxygen and 169,008 lbs (76,660 kg) RP-1 rocket fuel propellants. xwTS7" %z ;HQIP&vDF)VdTG"cEb PQDEk 5Yg} PtX4X\XffGD=H.d,P&s"7C$ endobj The interface includes mechanical, << /ProcSet [ /PDF /Text ] /ColorSpace << /Cs1 7 0 R >> /Font << /TT8 15 0 R The ESPAStar platform uses a customized EELV Secondary Payload Adapter (ESPA) ring as part of its structure and is capable of being launched aboard any launch vehicle that meets the Evolved Expendable Launch Vehicle (EELV) standard interface specification, Falcon 9 and Falcon Heavy. [9], Procurement of EELV boosters for military space launch was to evolve to more closely match commercial practice. 0 N } "zQjC+6\Ei8rF2+m0 The Evolved Expendable Launch Vehicle (EELV) system is being developed by the United States Air Force (USAF) and its prime contractors to meet the nations need for expend-able launch vehicles through the . endobj endobj Abstract. The Delta IV Heavy launch vehicle uses three Common Booster Cores (CBCs) each powered by a Pratt and Whitney Rocketdyne RS-68A engine, a Delta Cryogenic Second Stage 5m (DCSS) powered by an RL10, and a 5m payload fairing. [14] The USAF moved 7 launches from Delta IV to Atlas V.[15] To end litigation and competition for a limited market, both companies agreed to form the United Launch Alliance (ULA) joint venture. 0000010365 00000 n <<1FA29D3E1AADB2110A00D0FE946CFD7F>]/Prev 340978>> To do so, ULA has had to maintain sufficient cost accounting systems within the company. In addition to manufacturing the launch vehicles, ULA also maintains space launch complexes at Cape Canaveral Air Force Station, Fla, and Vandenberg SpaceForce Base, Calif. If that was the case, then the Air Force will have developed a new family of launch vehicles that would be primarily used only for national security payloads, resulting in higher overhead costs to DoD, while missing an opportunity to maximize the competitive posture of US industry. 1. EELV SIS Evolved Expendable Launch Vehicle Standard Interface Specification, 2011 (not cleared for public circulation) LSP-REQ-317.01B Launch Services Program (LSP) Program Level Dispenser and . Delta IV CBCs and DCSSs are integrated horizontally before being transported to the launchpad. Although additional new entrants may be able to compete in the future, it is unlikely that others will be ready to compete before Phase 2. 0000003519 00000 n . 0000068253 00000 n After a two-year solicitation and competition process in 20182020, in August 2020 the USSF selected SpaceX (F9 and FH) and ULA's yet-to-be-certified Vulcan Centaur to supply US military launch requirements in 20222027. %PDF-1.5 % [7A\SwBOK/X/_Q>QG[ `Aaac#*Z;8cq>[&IIMST`kh&45YYF9=X_,,S-,Y)YXmk]c}jc-v};]N"&1=xtv(}'{'IY) -rqr.d._xpUZMvm=+KG^WWbj>:>>>v}/avO8 R'O* u/7svAZ6r4[ZDX$22L)966@D1{2?=ben6hy. 0000000016 00000 n [47] In 2020, Northrop Grumman announced the cancellation of OmegA. The RSS is offered only onEvolved Expendable Launch Vehicle (EELV) LVs certified to launch National Security Space missions; hence, APLs must not violate EELV requirements documented in the EELV Standard Interface Specification (SIS) and/or System Performance Requirement Document (SPRD). Boeing received $1.38 billion, and Lockheed Martin received $650 million for the launches. hb``g``f`f`. 0000010608 00000 n Reducing the cost of launches and ensuring national access to space were the two main goals of the USAF space launch/EELV program. 0000101481 00000 n ' Zk! $l$T4QOt"y\b)AI&NI$R$)TIj"]&=&!:dGrY@^O$ _%?P(&OJEBN9J@y@yCR nXZOD}J}/G3k{%Ow_.'_!JQ@SVF=IEbbbb5Q%O@%!ByM:e0G7 e%e[(R0`3R46i^)*n*|"fLUomO0j&jajj.w_4zj=U45n4hZZZ^0Tf%9->=cXgN]. [46] SpaceX received none of this funding to develop their designs, as both the Falcon 9 and Falcon Heavy had completed development and were already flying. 0000001313 00000 n K0iABZyCAP8C@&*CP=#t] 4}a ;GDxJ> ,_@FXDBX$!k"EHqaYbVabJ0cVL6f3bX'?v 6-V``[a;p~\2n5 &x*sb|! << /ProcSet [ /PDF /Text ] /ColorSpace << /Cs1 7 0 R >> /Font << /TT2 9 0 R xref 0000135929 00000 n endstream endobj 638 0 obj <>/Metadata 52 0 R/Pages 635 0 R/StructTreeRoot 114 0 R/Type/Catalog>> endobj 639 0 obj <>/MediaBox[0 0 612 792]/Parent 635 0 R/Resources<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 640 0 obj <>stream endobj endobj NASA Mission Specific ESPA SIS 4 LSP-REQ-317.01B Launch Services Program Program Level Dispenser and CubeSat 0000003910 00000 n The approach continues procurement of launch services and launch capability from ULA for the next several years but provides for a full and open competitive environment for any alternative sources as soon as they are certified. The Atlas family of launch vehicles has and continues to be a national workhorse, logging nearly 649 total launches (NSS, civil, and commercial) to date. ULAs use of these tactics artificially created a need for relief from legislative restrictions on its ability to continue using RD-180relief that, with the DoDs active assistance, ULAs actively sought in the fiscal year 2016 omnibus appropriations bill. endobj [5][6], The NSSL program launches the nation's most valuable military satellites; contracts to launch lower value payloads, such as those of the Space Test Program, are awarded using different methodologies.[7]. In October 2018, the USAF awarded development funding to ULA, NGIS, and Blue Origin to further the design of their rockets before a subsequent competition for award to build the launch vehicles. O*?f`gC/O+FFGGz)~wgbk?J9mdwi?cOO?w| x&mf The EELV was expected handle the bulk of the U.S. government's launch requirements after the year 2000 and was also expected to be used for commercial applications. 0000004106 00000 n 4 0 obj At the same time, another 14 boosters were to be procured competitively beginning in 2015, with the initial launches to be performed in 2017. In 2018, a competitive contract award to launch national security spacecraft was conducted between United Launch Alliance (ULA), Northrop Grumman Innovation Systems (NGIS), Blue Origin, and SpaceX. @(l(MW a 67E1efWmh8s`e3XY|t+$8f`~!Af6 Dy3 As an example, an Atlas V 551 has a 5.4m payload fairing, 5 SRBs, and 1 RL-10.[35]. In paying ULA for such fixed launch costs and executing the EELV program under a cost-plus contract, the DoD has reimbursed ULA for allowable, reasonable, and allocable costs for its launches, while requiring ULA to reimburse it on a per-launch basis for launches that ULA sells to its non-DoD customers. 0000002843 00000 n %PDF-1.7 % 7 0 obj VwSX$qjDMjdJpIo.|];"P+ S]^M%f{6x57>Z"}}2)p"B1dKwh[h!t!j)L[C@|}TUaH6hFHTFLV^Y#8g3Tx]!y;Tc^>ME|= 9WTsD. <>stream DULLES, Va. Dec. 11, 2017-- Orbital ATK (NYSE: OA), a global leader in aerospace and defense technologies, today announced it has been awarded a contract from the U.S. Air Force Space and Missiles Center (AFSMC) to build LDPE, or the Long Duration Propulsive Evolved Expendable Launch Vehicle (EELV) Secondary Payload Adapter (ESPA) space platform. -2- 6;6_.k EELV SIS Evolved Expendable Launch Vehicle Standard Interface Specification LSP-REQ-317.01B Launch Services Program (LSP) Program Level . 5 0 obj Delta IV's inaugural flight was marked by the successful launch of a commercial satellite on a Medium-Plus (4,2) in November 2002. 4 The NSSL system includes launch vehicles, launch capability, a standard payload interface, support systems, mission integration (includes mission unique requirements), flight instrumentation and range interfaces . This page was last edited on 19 February 2023, at 18:43. . Boeing initially proposed using the RS-25 Space Shuttle main engine. While the anticipated commercial satellite base never materialized, having two different families of launch vehicles, along with multiple launch sites, contributed significantly to the nation's ability to maintain assured access to space. 7 0 obj [ /ICCBased 12 0 R ] EELV was important not only to reducing the launch costs of the Department of Defense, but also to the continued world-wide competitiveness of the US commercial launch industry. After many years of government-funded studies on the subject of modernized launch vehicle systems, the Air Force finally developed a "roadmap" in 1994 for the acquisition of Evolved Expendable Launch Vehicles (EELVs) to replace the DELTA IIs, ATLAS IIs, and TITAN IVs then in use at Cape Canaveral. 0000068216 00000 n As of that time, Vulcan Centaur was on track for a 2021 launch. 0000001699 00000 n The 4m diameter DCSS was retired with the Delta IV Medium after the 22 August 2019 launch of a GPS-III satellite on a Delta IV M+(4,2) two SRBs, and a 4m diameter DCSS and payload fairing. ;mnf4fb3/!s}Wz#I/MeFg_$ob$bOR JDs5~7^U.BV*p3]2j,BBR3Pq2,LnVL{gLj}U;g;bqGQY7C85V7y3fi=fp"n0+ddobk In August 2021, ULA announced that Atlas V would be retired, and all 29 remaining launches had been sold. With multiple launch vehicle configurations and launch sites on both coasts of the U.S., EELV has a proven track record of success, demonstrating unprecedented reliability with 106 successful launches since 2002. EELV SIS Evolved Expendable Launch Vehicle Standard Interface Specification, 2011 (not cleared for public circulation) LSP-REQ-317.01B Launch Services Program (LSP) Program Level Dispenser and CubeSat Requirements Document MIL-STD-1540C Military Standard Test Requirements for Launch, Upper-Stage, and Space Vehicles Falcon Heavy has been certified for two Phase 1A reference orbits and as of 2019, "[i]t's not certified for all of our most stressing national security space orbits," Thompson said. Either a 4m or 5m fairing encapsulates the payload. %PDF-1.6 % [47] Blue Origin is considered likely to continue building and testing New Glenn, in part since they were already privately funding development prior to the Air Force NSSL competition. 0000070080 00000 n 0000001202 00000 n It has been certified for the NSSL program after the STP-2 launch completed on 25 June 2019, as confirmed by the commander of the Air Force Space and Missile Systems Center, Lt. Gen. /TT4 11 0 R >> >> Announced performance requirements include:[29][30]. [13] Boeing and Lockheed Martin were each awarded US$500 million for the final phase of the bid. hb```,l? %%EOF 0000087266 00000 n 678 0 obj <>stream [20], The USAF signed a contract at that time with SpaceX for two launches in 2014 and 2015 to serve as proving flights to support the certification process for the Falcon 9 v1.1 and Falcon Heavy. The payload interface at each port has been standardized, allowing for hosted and separable payload inter-changeability, late payload integration, 0000015754 00000 n EELV STANDARD INTERFACE SPECIFICATION VERSION 5.0. Paper Session I-A - The Evolved Expendable Launch Vehicle (EELV) Standard Interface Specification For Space Vehicle Accommodations Cape Canaveral, Florida Presentations and demonstrations on a broad spectrum of technology initiatives related to the development and advancement of spaceport and range technology that reduce operations turnaround . Up to five solid rocket boosters can be added to augment performance. Abstract. {,M?TSwjj:2U|=ney(ymjvkeY&AeZDuL2 M#oWX~s iAzj]:a[Fd U?Vi5p5Zq,9,bZ/@,%, 6`#@)4I7,nCsSXDiAG'By"yeGy)h\s1{.D._"e-`uM67h2I ]_R)4I}I ? 6 0 obj endobj As the Air Force's spacelift modernization program, EELV was designed to increase reliability and reduce launch costs by at least 25 percent over heritage Atlas, Delta and Titan space launch systems. The payload interface at each port has been EELV Standard Interface Specification - Version 6.0 2. Opportunity which will utilize an Evolved Expendable Launch Vehicle (EELV) Secondary Payload Adapter (ESPA) or ESPA Grande. A1vjp zN6p\W pG@ The ELC contract, unlike other payments that the Air Force makes to ULA for launch services, subsidizes costs not directly related to the launch-vehicle hardware, including the depreciation of ULAs launch vehicles and infrastructure. [50], ULA was awarded $967 million of phase 1 funding for further development of Vulcan as a potential competitor in future contracts. RFP F04701-97-R-0008 19 June 1998 ii The ESPAStar platforms six payload ports are capable of accommodating any combination of up to six hosted and 12 separable (fly-away) payloads (maximum one hosted or two separables per port). EELV STANDARD INTERFACE SPECIFICATION VERSION 5.0. The intent was to replace legacy vehicles, including Delta II, Atlas II, and Titan IV. 3 August 2016. . [48][47] 1401 [46] OmegA was a rocket design with two main solid stages, a cryogenic upper stage, and the possibility of additional solid-rocket strap-on boosters. The US Space Force (USSF) plans 3034 launches during these five fiscal years. 1. DHh0D@z5+?w Under Solicitation Number FA8811-16-R-000X, released 14 March 2017, Air Force Space Command - Space and Missile Systems Center draft solicitation ws to implement the Evolved Expendable Launch Vehicle (EELV) strategy to transition from the use of "non-allied" [aka Russian RD-180] engines and to implement affordable assured access to space via sustainable competition with commercial providers. [38] This launcher features a reusable first stage and fairings, which lowers the cost per mission. >> stream FV>2 u/_$\BCv< 5]s.,4&yUx~xw-bEDCHGKwFGEGME{EEKX,YFZ ={$vrK The EELV program is in the portfolio. The goal was the creation of a cost-efficient and reliable family (or families) of "right size" spacelifters based on standardized fairings, liquid core vehicles, upper stages, and solid rockets. 651 0 obj <>/Filter/FlateDecode/ID[<6EC1C2F151EC3C45B8B5ECDBB3EB3C71><0EADE15319BF1E45AF492E40E1E9E55A>]/Index[637 42]/Info 636 0 R/Length 86/Prev 989486/Root 638 0 R/Size 679/Type/XRef/W[1 3 1]>>stream @media only screen and (min-device-width : 320px) and (max-device-width : 480px) { [21] In April 2014, after the launches were contracted, SpaceX sued the United States Air Force,[22][23] arguing that the RD-180 engines, produced in Russia by the government owned NPO Energomash and used by the Atlas V, violated sanctions against the Russian government. 0000001712 00000 n On this Wikipedia the language links are at the top of the page across from the article title. 0000017080 00000 n 6 0 obj The Medium & Medium-Plus vehicles use a single Common Booster Core (CBC), while the Heavy variant uses three CBCs. The Pratt & Whitney Rocketdyne -built RS-68, a liquid hydrogen/liquid oxygen engine that produces 663,000 lbs of liftoff thrust, powers the first stage. 0000000776 00000 n Of those 106 launches, 57 have been EELV National Security Space launches in support of the Navy, National Reconnaissance Office and the SpaceForce. [ /ICCBased 18 0 R ] wc/CR6@Vf|N`ObN#C8\'08#9MVk-v^.O@G}&(U! AGR-aH2\p|)+h 27 0 obj <> endobj xref a new EELV acquisition strategy in November 2011, revising it in 2013. Development includes all efforts leading up to and including EELV certification (and the validation of all NRE work) to meet the full range of EELV mass-to-orbit requirements [53] The awards in August 2020 are a major part of "the transition of the national security launch program to take advantage of commercial innovation and private investments in launch vehicles."[47]. 0000006557 00000 n The program is managed by the Space Force's Space Systems Command (SSC), specifically the Assured Access to Space Directorate (SSC/AA),[1] in partnership with the National Reconnaissance Office. 0000027829 00000 n 5 0 obj Making space accessible. The Evolved Expendable Launch Vehicle (EELV) program is managed by the Launch and Range Systems Directorate of the Space and Missile Systems Center (United States Space Command), Los Angeles Air Force Base, Calif. The EELV system includes all equipment, facilities, and launch base infrastructure necessary to launch a payload, place it in the required delivery orbit, provide specified environments, provide. 0000082556 00000 n For example, in order to meet its projected reductions in life cycle costs, the EELV needed to capture at least 15 percent of the commercial market. In 1998, when it appeared the growth in the commercial satellite industry would be able to sustain two providers of launch services, the Air Force decided to award contracts to both Boeing and Lockheed Martin for their respective launch capabilities. Up to five solid rocket boosters can be added to augment performance. 2 0 obj ]$p_>Ox1s?Vm,po%\Y&7r0& Sa`c6yh 2(~Xb)e# La?y`/sY< -RV\]{wTKc}6saI]Y >:GP!~3kT The Atlas V family uses a Russian RD-180 to power the first stage Common Core Booster. endobj ?fA(4 F 1@DCPog|yReAZirIrj{*0X}0b{37Vl [mvK7!,ubg-Yj0S(.rIW~,vMJro 8>-\8~-Yw0z UP2^PoDAzuEu;*YRs.KA=^>l=bLe*qV&y.vt%?k7MI(x8 zluC m^"4~b7 xBHNxZ9RRJhkL1hV0 LHJ9KDv"iE^p!+X$(/MDP_dP =|>hPHICt4B@n#,sqBGFY!u&i-dTr2e$'bWv7BiT|nT^F)U9K,rN0bi\2tR0,; Yz{:|*sO=c>z+Mf2BB.4Y!KRcW The platform is optimized for GEO missions, but is adaptable for LEO and MEO missions. CX' )3~~0Q I3W The ESPAStar platform's 6 payload ports are capable of accommodating any combination of up to 6 hosted and 12 separable (fly-away) payloads (maximum 1 hosted or 2 separables per port). FV>2 u/_$\BCv< 5]s.,4&yUx~xw-bEDCHGKwFGEGME{EEKX,YFZ ={$vrK 2784 0 obj <>stream [32] The DCSS had 4m diameter and 5m diameter versions, with matching diameter payload fairings. << /Length 5 0 R /Filter /FlateDecode >> We encourage you to use one of these browsers for the best experience. Standard payload interfaces were touted as another way to save money and improve efficiency, though success in that area remained to be seen. - The EELV program is a funded U.S. Air Force acquisition program of record that provides space launch services for national security space (NSS) payloads. - A final check of specifications will be conducted prior to launch. 12 0 obj hbbd```b`` D:H3YH22H5,)qS =A&]8 I ESPA (Secondary Payload Adapter) on EELV (Evolved Expendable Launch Vehicle) configurations a multiple launch system for small satellites used in the STP . A1vjp zN6p\W pG@ LV Mechanical Interface: The standard mounting pattern is a repeatable square grid pattern, independent of . endobj 0000003406 00000 n 0 << /Type /Page /Parent 3 0 R /Resources 6 0 R /Contents 4 0 R /MediaBox [0 0 612 792] Semantic Scholar's Logo. /TT2 9 0 R /TT6 13 0 R /TT10 17 0 R /TT4 11 0 R >> >> EELV secondary payload adapter (ESPA) static qualification tests Download PDF. 18 0 obj ESPA is designed to quasi-static acceleration load factors that were derived from the EELV Standard Interface Specification Document (SIS). Delta IV Payload Planners Guide - October 1999 endobj [35], A three-digit (XYZ) naming convention is used for the Atlas V configuration identification. Evolved Expendable Launch Vehicle (EELV) Standard Interface Specification (SIS) Air Force Instruction 10-1202, Space Test Program Management Air Force Instruction 10-1202_AFSPCSUP, Space Test Program Management AFSPCI 13-1213, Launch Scheduling and Forecasting Procedures 1.5.2 Department of Defense Documents Two providers were to be selected to launch spacecraft to a number of reference orbits. The contractor was standardizing payload interfaces, launch pads, and infrastructure so that all configurations of each contractor's EELV family can be launched from the same pad and payloads can be interchanged between vehicles in the same class (i.e., medium, intermediate, or heavy). 0 stream Launch Systems Enterprise Directorate (SMC/LE) 483 N. Aviation Blvd. 0000001790 00000 n %%EOF The Evolved Expendable Launch Vehicle (EELV) system is being developed by the United States Air Force (USAF) and its prime contractors to meet the nations need for expend-able launch vehicles through the . 1320 [24] The USAF and SpaceX settled the lawsuit in Jan 2015 by opening up more launches to competitive bidding. SpaceX and ULA were the two vendors selected via the competition to supply launches to the US military in the 20222027 timeframe. 0000004200 00000 n ' Zk! $l$T4QOt"y\b)AI&NI$R$)TIj"]&=&!:dGrY@^O$ _%?P(&OJEBN9J@y@yCR nXZOD}J}/G3k{%Ow_.'_!JQ@SVF=IEbbbb5Q%O@%!ByM:e0G7 e%e[(R0`3R46i^)*n*|"fLUomO0j&jajj.w_4zj=U45n4hZZZ^0Tf%9->=cXgN]. stream stream 0000006428 00000 n The Atlas V's inaugural flight was marked by the successful launch of a Hotbird-6 commercial satellite in August 2002. 0000010105 00000 n %PDF-1.4 % 120 0 obj [46] On 12 August 2019, ULA submitted Vulcan Centaur for phase 2 of the USAF's launch services competition. Photo Credit: U.S. Space Force. The Atlas V family is capable of carrying payloads of 8,900 kg (19,620 lbs) to geosynchronous transfer orbit, and can lift 16,034 kg (35,343 lbs) to low-Earth orbit. Up to five Aerojet Rocketdyne Graphite-Epoxy Motor solid rocket boosters can be added to increase vehicle performance, and two diameters of payload fairing are available. The Evolved Expendable Launch Vehicle (EELV) Secondary Payload Adapter (ESPA) Secondary Payload Planner's Guide is published by the Space Test Program (STP) Office, Space and Missiles System Center, Kirtland . These launch vehicles provide critical spacelift capability to support Department of Defense and other National Security missions (together known as National Security Space (NSS) missions). These load factors, as shown in Table 1, represent a set of accelerations that This document was produced and is maintained by the Evolved Expendable Launch Vehicle Search 209,668,378 papers from all fields of science . The EELV competition was expected to produce the next generation of launch vehicles to replace all medium to heavy launchers, Lockheed Martin's Atlas, Titan II and Titan IV series, and McDonnell Douglas's Delta series, with a single family of vehicles capable of launching medium and heavy payloads into orbit at a significantly lower cost. Thompson. This website is best viewed in browsers such as: Edge, Firefox, Chrome, or Safari. [3][4], On 1 March 2019, the program name was changed from EELV to National Security Space Launch (NSSL) to better reflect the growing commercial launch market and the changing nature of launch contracts, including the potential for reusable launch vehicles. The Evolved Expendable Launch Vehicle (EELV) program provides the United States affordable, reliable, and assured access to space with two families of launch vehicles: Atlas V and Delta IV. 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