KBKhA builds RD-0124 by themselves ("in-house").
But can you point us to a good reference for the fact that KBKhA build it in-house?
Quote from: SLC on 02/16/2017 08:58 PMBut can you point us to a good reference for the fact that KBKhA build it in-house?Official history book of KBKhA, Люди и ракетные двигатели ("People and rocket engines"), page 262, for example.http://www.kosmonavtika.com/bibliographie/livres/couvertures/kbkhalioudi.jpg
Set n°151 was used on 27 September 1985 for a ground test
Quote from: Nicolas PILLET on 07/22/2013 04:14 PMSet n°151 was used on 27 September 1985 for a ground testSet 151 was used for a real flight with Kosmos-1686, not for a ground test.Screenshot from Novosti kosmonavtiki magazine 11/2000 (page 62):
In addition to the structual enhancement, the RD-253 first stage engines are uprated. For performance purposes, rated thrust on the engines of the first stage of Proton M is being increased by 7%. This enhancement is accomplished with only a minor modification to the propellant flow control valves. This modification first flew as a mission-unique enhancement on the Proton K that delivered the MIR space station core module in 1986.Proton Mission Planner’s Guide, LKEB-9812-1990 Issue 1, Revision 4, March 1, 1999
"A batch of six engines is built for the four-engine second stage of the Proton, with the other two subjected to extended testing and then analysis."So the four actual flight engines are not tested? This is the same system that worked so well on the N-1.
Did I understand correctly that no proton launches are expected during 2017?