The Blok DM-03 (Russian: Блок ДМ-03 meaning Block DM-03), GRAU index 11S861-03, is a Russian upper stage used as an optional fourth stage on the Proton-M heavy-lift rocket. Three have been launched, the first in December 2010; the first two launches failed before fourth stage ignition, the first as a result of a problem with the Blok DM's fuel load.
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| - Blok DM-03 (en)
- Block DM-03 (cs)
- Blok DM-03 (in)
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| - Block DM-03 (rusky:Блок ДМ-03), index 11S861-03, je ruský horní raketový stupeň, spalující kerosen a kapalný kyslík, používaný jako čtvrtý stupeň těžkých nosných raket Proton, Angara 3 a Angara 5. Může být použit namísto staršího stupně Block DM-2. (cs)
- Blok DM-03 (Rusia: Блок ДМ-03 makna Blok DM-03), indeks Grau 11S861-03, adalah tahap atas Rusia yang digunakan sebagai tahap keempat opsional pada roket Proton-M. Blok DM dapat menyuntikkan muatan ke orbit yang lebih akurat daripada Briz-M, sehingga lebih cocok untuk meluncurkan satelit seperti Uragan-M yang kurang pada motor apogee. (in)
- The Blok DM-03 (Russian: Блок ДМ-03 meaning Block DM-03), GRAU index 11S861-03, is a Russian upper stage used as an optional fourth stage on the Proton-M heavy-lift rocket. Three have been launched, the first in December 2010; the first two launches failed before fourth stage ignition, the first as a result of a problem with the Blok DM's fuel load. (en)
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| - Block DM-03 (rusky:Блок ДМ-03), index 11S861-03, je ruský horní raketový stupeň, spalující kerosen a kapalný kyslík, používaný jako čtvrtý stupeň těžkých nosných raket Proton, Angara 3 a Angara 5. Může být použit namísto staršího stupně Block DM-2. (cs)
- The Blok DM-03 (Russian: Блок ДМ-03 meaning Block DM-03), GRAU index 11S861-03, is a Russian upper stage used as an optional fourth stage on the Proton-M heavy-lift rocket. Three have been launched, the first in December 2010; the first two launches failed before fourth stage ignition, the first as a result of a problem with the Blok DM's fuel load. Initial versions of the Blok DM-03 are powered by a single RD-58M engine, burning RG-1 and liquid oxygen. The last evolution is powered by the improved RD-58MF, a less powerful but more efficient evolution of the venerable engine. It can carry 25% more propellant than the Blok DM-2, which it replaced as a Proton upper stage for some government launches. However most government launches and all commercial missions use the Briz-M instead. The payloads for the first two Blok DM-03 launches were groups of three Uragan-M satellites for the GLONASS programme, with further missions slated to carry three more Uragan-M satellites, and two Ekspress satellites on separate launches. The Blok DM can inject payloads into orbit more accurately than the Briz-M, making it better suited for launching satellites such as the Uragan-M which lack apogee motors. When production ended in 2012, five Blok DM-03 stages had been produced by RKK Energia, for use on Proton and potentially Zenit rockets. A new version of the upper stage is expected to be introduced once the five launches are complete; all five DM-03s have been slated for Proton launches between 2010 and 2015. During a November 2014 interview, Vladimir Kolmykov, the Deputy General Director of the Chemical Division of Krasnoyarsk Machine-Building Plant, stated that the production of Block-DM was suspended during that year, but work on the stage and development of the RD-58MF resumed during 2015. (en)
- Blok DM-03 (Rusia: Блок ДМ-03 makna Blok DM-03), indeks Grau 11S861-03, adalah tahap atas Rusia yang digunakan sebagai tahap keempat opsional pada roket Proton-M. Blok DM dapat menyuntikkan muatan ke orbit yang lebih akurat daripada Briz-M, sehingga lebih cocok untuk meluncurkan satelit seperti Uragan-M yang kurang pada motor apogee. (in)
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| - Blok DM-2 (en)
- Blok DM-SL (en)
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