A solid result, and a hint that Proton Phase 4 has more performance in her. This was likely the second "close call" this year among all of the world's launch vehicles. I wonder if Briz M was able to perform its post-separation burns as planned. - Ed Kyle
According to this official image http://coopi.khrunichev.ru/download/2016/is31/activn_0000.png , Proton-M velocity at third stage cutoff was 28 m/c less than nominal which easily explains Briz-M overburn.
Quote from: Liss on 06/09/2016 10:55 amAccording to this official image http://coopi.khrunichev.ru/download/2016/is31/activn_0000.png , Proton-M velocity at third stage cutoff was 28 m/c less than nominal which easily explains Briz-M overburn.Igor - do you know the intended stage 3 perigee/apogee? Probably about -500 x 170 as usual?
.... This was likely the second "close call" this year among all of the world's launch vehicles..... - Ed Kyle
ILS with a "nothing to see here, move along" statement?The following is a statement from International Launch Services (ILS) and Khrunichev State Research and Production Space Center (Khrunichev) on the ILS Proton Breeze M launch of the Intelsat 31 satellite on June 9, 2016 from the Baikonur Cosmodrome:The ILS Proton Breeze M launch vehicle successfully delivered the Intelsat 31 spacecraft to its Super Synchronous Transfer Orbit on June 9. Both ILS and Khrunichev confirm that the flight path was within requirements with a precise satellite injection orbit of 3428 x 64,964 km, inclined 29.53 degrees and within 1.1 m/s of the target, well within Interface Control Document (ICD) requirements. Telemetry data is currently being processed.
Investigation into the close call launch beginsFollowing the successful release of the Intelsat-31 satellite, Russia formed an accident commission to investigate the circumstances of a close call during the operation of the second stage's propulsion system and to develop corrective actions as necessary, industry sources said.(Details to come)
Разработка и реализация мероприятий а связи с имевшимся случаем самопроизвольно-го, скачкообразного снижения до 51% режима работы двигателя РД-0211 №5355365421 при пуске РН «Протон-М» №535-13.
Anatoly's web site has this note on the Intelsat-31 launch page:QuoteInvestigation into the close call launch beginsFollowing the successful release of the Intelsat-31 satellite, Russia formed an accident commission to investigate the circumstances of a close call during the operation of the second stage's propulsion system and to develop corrective actions as necessary, industry sources said.(Details to come)