SpaceX plans Jan 8 launchSpaceX today released its final investigation results on the September 1 Falcon 9 launchpad explosion, and announced that they have now scheduled their next launch for January 8 out of Vandenberg Air Force Base.
As expected, the cause is the accumulation of solid oxygen in the wrappings of the helium bottle tank (COPV) inside the oxygen tank of the first stage. The following is their announced solution:
The corrective actions address all credible causes and focus on changes which avoid the conditions that led to these credible causes. In the short term, this entails changing the COPV configuration to allow warmer temperature helium to be loaded, as well as returning helium loading operations to a prior flight proven configuration based on operations used in over 700 successful COPV loads. In the long term, SpaceX will implement design changes to the COPVs to prevent buckles altogether, which will allow for faster loading operations.​
Their vagueness in describing the “prior flight proven configuration” is likely to protect proprietary information, but the overall solution suggests that their fuel loading operations will take longer.
The January 8 launch date was simultaneously announced on twitter.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
SpaceX today released its final investigation results on the September 1 Falcon 9 launchpad explosion, and announced that they have now scheduled their next launch for January 8 out of Vandenberg Air Force Base.
As expected, the cause is the accumulation of solid oxygen in the wrappings of the helium bottle tank (COPV) inside the oxygen tank of the first stage. The following is their announced solution:
The corrective actions address all credible causes and focus on changes which avoid the conditions that led to these credible causes. In the short term, this entails changing the COPV configuration to allow warmer temperature helium to be loaded, as well as returning helium loading operations to a prior flight proven configuration based on operations used in over 700 successful COPV loads. In the long term, SpaceX will implement design changes to the COPVs to prevent buckles altogether, which will allow for faster loading operations.​
Their vagueness in describing the “prior flight proven configuration” is likely to protect proprietary information, but the overall solution suggests that their fuel loading operations will take longer.
The January 8 launch date was simultaneously announced on twitter.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
Since SpaceX has been chilling its LOX in order to increase its density and thus the amount contained in the Falcon 9, they tried to find a way to reduce the time for filling the tanks and doing so immediately prior to launch, thus reduce the temperature increase (and reduced density) while on the pad prior to launch. It seems that they will have to keep searching for a different process that allows for a similar outcome.
For several months prior to this accident, they had been doing this type of O2 densification for their launches to geostationary transfer orbit in order to have the necessary propellant remaining in order to successfully land their first stage on their drone ship (barge) for later reuse. The first time I heard of them using this densification, they had been unable to keep the temperature low enough for long enough to launch, and they tried a couple of times.
I am a bit surprised that friction from the composite wrap can create enough energy to be an ignition source, but then again, it is like rubbing two sticks in pure oxygen.