6

They are the same basic engine, just the RD-0211 has a heat exchanger, that is lacking on the RD-0210. The long history of the Proton went through three or more major revisions, and the engines were renumbered in each revision, as a pair. Each time, one with heat exchanger, one without. There is much more detail on Wikipedia about the RD-210 Engine.


5

Spaceflight101 gives the direct geostationary orbit payload capacity as 3500kg using the Briz-M stage. http://spaceflight101.com/spacerockets/proton-m-briz-m/ Wikipedia lists it as 3250kg, referring to a 2009 mission planner's guide.


5

«Если что-то в ракете перестает работать, подается команда АВД — «аварийное выключение двигателей». Это пошло еще со времен боевых ракет, чтобы в случае отказа ракета упала на нашей территории. Двигатели выключаются, ракета падает в атмосфере и, как правило, сгорает», — поясняет редактор журнала «Новости космонавтики» Игорь Афанасьев. Поскольку ракета стоит ...


3

We now have (as of 10:25 UTC 16/05/15) a statement from ILS on the anomaly. The relevant quote: Khrunichev and International Launch Services (ILS) regret to announce an anomaly during today's Proton mission with the Centenario satellite. The satellite was built for Mexican government’s Ministry of Communications and Transportation, the Secretaria de ...


2

These are the fresh ideas as published by ILS: Proton Medium / Proton Light Expanded Proton Line: Proton Medium & Proton Light The main development is in the removal of the second stage and the reduction of the first stage.


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