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Hopper (spacecraft)

From Wikipedia, the free encyclopedia

Hopper
CountryESA
Contract awardEADS, German Aerospace Center
StatusCanceled

Hopper was a proposed European Space Agency (ESA) orbital spaceplane and reusable launch vehicle. The Hopper was a FESTIP (Future European Space Transportation Investigations Programme) system study design.[1]

Hopper was one of several proposals for a reusable launch vehicle (RLV) developed by the ESA. The proposed reusable launch vehicles were to be used for the inexpensive delivery of satellite payloads into orbit as early as 2015.[2] A prototype of Hopper, known as (EADS) Phoenix, was a German-led European project which involved the construction and testing of a one-seventh scale model of the proposed Hopper. On 8 May 2004, a single test flight of the Phoenix was conducted at the North European Aerospace Test range in Kiruna, Sweden, which was followed by more tests later that month.[3]

Development

Background

From the 1980s on, there was growing international interest in the development of reusable spacecraft; at the time, only the superpowers of the era, the Soviet Union and the United States, had developed this capability.[4] European nations such as the United Kingdom and France embarked on their own national programs to produce spaceplanes, such as HOTOL and Hermes, while attempting to attract the backing of the multinational European Space Agency (ESA). While these programs ultimately did not garner enough support to continue development, there was still demand within a number of the ESA's member states to pursue the development of reusable space vehicles.[4] During the 1990s, in addition to the development and operation of several technology demonstrator programs, such as the Atmospheric Reentry Demonstrator (ARD), the ESA were also working on the production of a long-term framework for the eventual development of a viable reusable spacecraft, known as the Future Launchers Preparatory Programme (FLPP).[5]

Under FLPP, the ESA and European industrial partners performed detailed investigations of several partially-reusable launch vehicle concepts; the aim of the program was to prepare a suitable vehicle to, upon a favorable decision by the ESA's member-nations, proceed with the production of a Next Generation Launcher (NGL).[5] A total of four launch concepts were studied, these were named as the Horizontal Take-Off (HTO) Hopper, the Vertical Take-Off (VTO) Hopper, the Reusable First Stage (RFS), and the liquid fly-back booster (LFBB). Each of these concept vehicles consisted of a reusable winged booster, which was paired with an expendable upper stage, to deliver a payload in geostationary transfer orbit (GTO).[5]

The HTO variant of Hopper was designed for horizontal take-off, the first portion of which was to be achieved via a rocket sled arrangement.[5] It possessed relatively conventional wing-body configuration, one atypical feature was the nose of the spacecraft, which possessed a deliberately low camber so that the required size of the elevons for desired trim functionality could be reduced while also resulting in an improved internal structure, such as in the accommodation of the nose gear.[5] Aerodynamically, the HTO Hopper configuration features a rounded delta planform wing at a 60-degree leading edge sweep, which was matched with a central vertical stabilizer and a flat-bottomed underside for the purpose of maximizing the spacecraft's performance during hypersonic flight.[5]

The alternative VTO variant of Hopper was designed for vertical take-off, being launched conventionally via an expendable launch system.[6] It features a relatively traditional slender missile-like body, but differed in the presence of a small delta wing at a 45-degree leading edge sweep and a central vertical stabilizer arrangement. In terms of its structure, the VTO Hopper possessed a circular cross section complete with a loft fillet on the underside of the craft which functioned to accommodate both the wings and bodyflap; it also featured a booster which was designed to carry on the payload upon the nose of the fuselage.[6] Studies determined that both the HTO and the VTO Hopper concepts possessed a relatively similar reentry load environment.[7]

HTO Hopper - Selection

The HTO version of Hopper was adopted for further development work under another ESA initiative in the form of the FESTIP (Future European Space Transportation Investigations Programme) system design study.[8] During 1998, it was decided the design of Hopper fulfilled all of the established requirements.[9] At this point, the spacecraft was to be composed of a single-stage reusable vehicle which would not attain orbital velocity itself. Hopper reportedly held the promise of delivering lower cost orbital deployment of payloads.[3] An EADS spokesperson stated that a reusable launch vehicle like Hopper could halve the cost of sending a satellite into orbit, which reportedly had been determined to be around $15,000 USD per kilogram of payload in 2004.[2]

The envisioned mission profile of Hopper would have involved several phases. The launch phase was to be achieved by using a 4 km magnetic horizontal track, which was to be purpose-built for the craft at the Guiana Space Centre in French Guiana, that would accelerate the spacecraft up to launch speed.[3][9] Upon reaching an altitude of 130 km, the vehicle would fire an expendable rocket-powered upper stage in order to attain orbital speed; once it had achieved the necessary high and speed, it would have released its satellite payload, which would then independently ascend higher still to reach the desired orbit.[3] Reportedly, Hopper was designed to deliver 7.5 tonne satellites into an orbit of 130 km above the surface of the Earth.[3] Following the release of its payload, the vehicle would have then glided down in a controller descent; it was intended for the spacecraft to land at a predetermined island facility in the Atlantic Ocean, after which it would have been transported back to French Guiana by ship for further flights.[2][3]

Multinational aerospace conglomerate EADS was responsible for project management on Hopper, as well as for the development of the entirety of the project's software-based elements.[9] A number of other partner companies were also involved in the spacecraft's development. Reportedly, both the ESA and EADS had originally intended to complete development of Hopper between 2015 and 2020.[9] After the first glide test using the Phoenix prototype in May 2004, no further updates on the programme were forthcoming; it is believed that work on Hopper has been eventually discontinued.[citation needed]

Prototype - Phoenix

The Phoenix RLV launcher, the prototype of Hopper launcher, was developed and produced as a portion of the wider ASTRA program of the German Aerospace Center (DLR), a €40 million project founded by the German Federal Government, EADS Astrium Space Transportation and the state Free Hanseatic City of Bremen. Reportedly, EADS and the State of Bremen invested at least €8.2 million and €4.3 million in the ASTRA programme, respectively. A further contribution of €16 million was sourced from partner companies on the program, such as the Bremen-based OHB-System, the DLR and the Federal Ministry for Education and Research. During 2000, construction of the prototype commenced.[9]

The Phoenix RLV prototype was 6.9 meters (23 feet) long, had a weight of 1,200 kilograms (2,600 pounds), and a wingspan of 3.9 meters (13 feet). During its design, an emphasis had been placed on minimizing drag by making the vehicle as small as possible.[9] The interior space of the craft's fuselage was occupied by various avionics and onboard system, providing navigation, data transfer, energy supply, and artificial intelligence functions to allow it to automatically perform its data-gathering mission.[3] Phoenix is one-sixth the size of the planned Hopper vehicle.[10] The final version of the vehicle was expected to be able to support the reentry forces, generated heat, and be able to glide from an altitude of 129 kilometers (80 mi). During April 2004, integration and systems testing work upon the Phoenix prototype had been completed.[9]

Drop tests - May 2004

On Saturday, May 8, 2004, the Phoenix prototype underwent a large-scale drop-test at the North European Aerospace Test range in Kiruna, Sweden, 1,240 km (770 mi) north of Stockholm, Sweden. The vehicle was dropped from a height of 2.4 kilometres (7,900 ft), having been lifted to the appropriate altitude by a helicopter. Following a guided 90 second glide, the prototype reportedly landed with precision and without incident.[11][3] The primary aim of the test was to assess the glider potential of the craft. More specifically, the Phoenix explored various methods of performing automatic landings that would not involve any intervention by human controllers; guidance was provided by cues from multiple means of navigation, including GPS satellites, radar and laser altimeters, as well as various pressure and speed sensors. According to EADS spokesman Mathias Spude, the prototype had landed within three centimeters of the intended target.[2]

In addition to the initial drop-test, further tests had already been scheduled, including three that were planned to occur during the following two weeks, which were to build towards the testing of more challenging landings, said to involve the spacecraft being dropped from different angles or orientations relative to the landing site.[2] Furthermore, the project had an anticipated milestone of eventually releasing the prototype from an altitude of 25 kilometers within three years. However, EADS noted prior to the flight that further flights of Hopper would be pending on the craft's performance during the initial flight.[9]

Two further test flights were conducted on May 13 and May 16 with May 13 being a repeat of the May 8 drop test.[12]

Longer term - Socrates

In the long term, if successful and viable, the landing technology tested on Phoenix was to be incorporated into a follow-on re-usable vehicle, which was to be named Socrates. While not envisioned to serve as an orbital vehicle, Socrates was to be capable of flying at up to 10 times the speed of sound, as well as of performing very rapid turnaround times between flights as a stepping stone towards re-usability.[2]

See also

References

Citations

  1. ^ Dujarric, C. (March 1999). "Possible Future European Launchers, A Process of Convergence" (PDF). ESA Bulletin. European Space Agency (97): 11–19.
  2. ^ a b c d e f McKee, Maggie. "Europe's space shuttle passes early test." New Scientist, 10 May 2004.
  3. ^ a b c d e f g h "Launching the next generation of rockets." BBC News, 1 October 2004.
  4. ^ a b "The Atmospheric Reentry Demonstrator." European Space Agency, October 1998. BR-138.
  5. ^ a b c d e f G. Pezzellaa et al. 2010. p. 36.
  6. ^ a b G. Pezzellaa et al. 2010. p. 37.
  7. ^ G. Pezzellaa et al. 2010. pp. 38-39.
  8. ^ "Possible Future European Launchers, A Process of Convergence - ESA Bulletin Number 97." ESA, March 1999.
  9. ^ a b c d e f g h "PHOENIX: Future prospects in space transport through reusable launch systems." Airbus, 10 May 2004.
  10. ^ European Space Shuttle Glides To Success 9 May 2004
  11. ^ "Phoenix Flight Day." Archived 2011-07-24 at the Wayback Machine Swedish Space Corporation, 8 May 2004.
  12. ^ IAC Vancouver, October 2004: "Reusable RLV Demonstrator Vehicles Phoenix Flight Test Results and Perspectives", W. Gockel et al. AAAF Arcachon, March 2005: "Synthesis Phoenix Flight Test Performance and Analysis", W. Gockel et al. AAIA Capua, May 2005: "Phoenix Project and Program Continuation Plan", P. Kyr and W. Gockel IAC Fukuoka October 2005: "Phoenix Demonstrator Logic", P. Kyr and J. Sommer

Bibliography

  • Gockel, Wilhelm; Kyr, Peter; Janovsky, Rolf; Roenneke, Axel (2004). "Reusable RLV Demonstrateur Vehicles - Phoenix Flight Test Results and Perspectives". 55th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law. Proceedings of the 55th International Astronautical Congress 2004. doi:10.2514/6.IAC-04-V.6.04.

External links

This page was last edited on 8 January 2021, at 22:23
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