Quote from: ZachS09 on 04/12/2017 03:59 amWhen you saw this one video, did you see the strap-on boosters stripping off moments before impact?If so, that would be the 1982 Zenit accident. An old thread here from a couple years ago had identified that video clip as the '82 failure. Otherwise the April 2, 1969 Proton accident is a possibility.In the case of the '88 accident, the core stage engines malfunctioned almost immediately at liftoff, but the booster computer system was blocked from sending a shutoff command until T+20 seconds so as to prevent a pad fallback. When the 20 second mark was reached, the command was unblocked and the core and strap-ons shut down. This turned out to not be enough time to get the booster away from the pad, which was severely damaged. According to a translated document I read, it seems like the core stage suffered a control rather than a propulsion system failure.The same document also noted that the '87 accident would not have been survivable on a manned launch, and apparently necessitated improvements to the Soyuz SAS abort system (at least that's what I could discern from the translated text).
When you saw this one video, did you see the strap-on boosters stripping off moments before impact?
Wow. I'm surprised how it remained mostly intact all the way down. That was surreal.
Emergency shutdown T+28,26 (sec)
Quote from: Alter Sachse on 04/12/2017 05:38 pmEmergency shutdown T+28,26 (sec)I believe the video clip linked here is in fact the 1988 failure, not the '82 one because the entire propulsion system shuts down, not just the core stage.
launch failures (on-pad or near the pad)possibly not completely16.04.1960 (Luna) exploded near the pad01.06.1962 Zenit 2 emergency shutdown T+1,8 sec /fell down 300m next to pad10.07.1963 Zenit 2 emergency shutdown T-1,5 sec /exploded / pad damaged - next launch 10/6318.03.1980 Tselina exploding when refueling / next launch April 1983 ! (43/4)15.05.1982 Zenit 6U failed T+28.26 crashed in the forest (41/1)26.09.1983 Sojus (T10) fire/exploded / next launch 11.06.1984 (1/5)18.06.1987 Resurs ex/pad damaged/next launch 12/88 (43/3)27.07.1988 Resurs fell down 50 m near the pad/pad damaged/ next launch 6/89 (43/4)04.10.1990 Tselina 2 ex T+2,44 sec (45/2)30.01.2007 NSS 8 ex shortly after liftoff (Odyssey)
Was Intelsat 27 to far from the pad to count?
An R-7 ICBM test on July 10, 1958 failed when one strap-on shut down at liftoff and broke away from the stack. The strap-on fell onto the pad while the rest of the vehicle crashed nearby. According to some sources, it carried some of the avionics intended for the Luna 8K72 booster, and the failure was caused by high frequency combustion chamber vibration which would end up being a nagging problem over the next two years.
Are you going to cite your sources or just blatantly cut and paste from wikipedia and bypassing its sources?
Quote from: WallE on 04/12/2017 04:14 amQuote from: ZachS09 on 04/12/2017 03:59 amWhen you saw this one video, did you see the strap-on boosters stripping off moments before impact?If so, that would be the 1982 Zenit accident. An old thread here from a couple years ago had identified that video clip as the '82 failure. Otherwise the April 2, 1969 Proton accident is a possibility.In the case of the '88 accident, the core stage engines malfunctioned almost immediately at liftoff, but the booster computer system was blocked from sending a shutoff command until T+20 seconds so as to prevent a pad fallback. When the 20 second mark was reached, the command was unblocked and the core and strap-ons shut down. This turned out to not be enough time to get the booster away from the pad, which was severely damaged. According to a translated document I read, it seems like the core stage suffered a control rather than a propulsion system failure.The same document also noted that the '87 accident would not have been survivable on a manned launch, and apparently necessitated improvements to the Soyuz SAS abort system (at least that's what I could discern from the translated text).Video clip from the launch failure on 15.05.1982http://www.kosmonavtika.com/lancements/1982/15051982/15051982photos.html
A real on-pad explosion (Nicolas' website) http://www.kosmonavtika.com/lancements/1990/04101990/04101990photos.html4.10.1990 pad 45/2 destroyed and never rebuilt
http://kik-sssr.ru/IP_4_Turatam_old_Razdel_1.htm