The XLR-129 was an American rocket engine design that would have used liquid hydrogen and liquid oxygen propellants. It was developed by Pratt & Whitney and initially was to develop 250,000 lbf (1,100 kN) of thrust. It featured an expanding nozzle in order to tune performance over a wide range of altitudes. The XLR-129 program was never completed, no complete engine was ever produced, but many systems were developed and tested.
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| - XLR129 (ja)
- Pratt & Whitney XLR-129 (en)
- Pratt & Whitney XLR-129 (pt)
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| - XLR-129はアメリカの液体水素/液体酸素を推進剤とする航空機用のロケットエンジンである。プラット・アンド・ホイットニーによって開発され、高度に応じて膨張比を変更可能な伸展式ノズルを備え、当初は推力が250,000 lbsだった。 XLR-129は当初、アメリカ空軍で1960年代に計画された偵察用有人ロケット飛行機であるアイシングラス計画の為に再使用型エンジンとして設計された。 スペースシャトルに搭載する為に推力を350,000 lbsに増強する事が試みられたがロケットダインのSSMEが採用された。 XLR-129計画は完成しなかった。完成したエンジンは生産されなかったが多くのシステムが開発され、試験された。 (ja)
- The XLR-129 was an American rocket engine design that would have used liquid hydrogen and liquid oxygen propellants. It was developed by Pratt & Whitney and initially was to develop 250,000 lbf (1,100 kN) of thrust. It featured an expanding nozzle in order to tune performance over a wide range of altitudes. The XLR-129 program was never completed, no complete engine was ever produced, but many systems were developed and tested. (en)
- O XLR-129 era um projeto de motor de foguete americano que usaria hidrogênio líquido e propelentes de oxigênio líquido. Ele foi desenvolvido pela Pratt & Whitney e inicialmente deveria desenvolver 250.000 lbf (1.100 kN) de empuxo. Ele apresentava um bico expansível para ajustar o desempenho em uma ampla gama de altitudes. O programa XLR-129 nunca foi concluído, nenhum motor completo foi produzido, mas muitos sistemas foram desenvolvidos e testados. (pt)
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| - The XLR-129 was an American rocket engine design that would have used liquid hydrogen and liquid oxygen propellants. It was developed by Pratt & Whitney and initially was to develop 250,000 lbf (1,100 kN) of thrust. It featured an expanding nozzle in order to tune performance over a wide range of altitudes. The XLR-129 was designed to be reusable and was initially paid for by the US Air Force, for a 1960s program called ISINGLASS, which was to be a manned rocket plane that was intended for surveillance overflights. For the Space Shuttle an attempt was made to increase the thrust to 350,000 lbf (1,600 kN), but in the end Rocketdyne's Space Shuttle Main Engine was used instead. The XLR-129 program was never completed, no complete engine was ever produced, but many systems were developed and tested. (en)
- XLR-129はアメリカの液体水素/液体酸素を推進剤とする航空機用のロケットエンジンである。プラット・アンド・ホイットニーによって開発され、高度に応じて膨張比を変更可能な伸展式ノズルを備え、当初は推力が250,000 lbsだった。 XLR-129は当初、アメリカ空軍で1960年代に計画された偵察用有人ロケット飛行機であるアイシングラス計画の為に再使用型エンジンとして設計された。 スペースシャトルに搭載する為に推力を350,000 lbsに増強する事が試みられたがロケットダインのSSMEが採用された。 XLR-129計画は完成しなかった。完成したエンジンは生産されなかったが多くのシステムが開発され、試験された。 (ja)
- O XLR-129 era um projeto de motor de foguete americano que usaria hidrogênio líquido e propelentes de oxigênio líquido. Ele foi desenvolvido pela Pratt & Whitney e inicialmente deveria desenvolver 250.000 lbf (1.100 kN) de empuxo. Ele apresentava um bico expansível para ajustar o desempenho em uma ampla gama de altitudes. O XLR-129 foi projetado para ser reutilizável e foi inicialmente pago pela Força Aérea dos Estados Unidos, para um programa da década de 1960 chamado Project Isinglass, que seria um avião-foguete tripulado destinado a sobrevôos de vigilância.Para o ônibus espacial foi feita uma tentativa de aumentar o impulso para 350.000 lbf (1.600 kN) mas no final o motor RS-25 Rocketdyne's foi usado. O programa XLR-129 nunca foi concluído, nenhum motor completo foi produzido, mas muitos sistemas foram desenvolvidos e testados. (pt)
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