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SpaceX's Falcon Heavy Center Booster Lacked Ignition Fluid To Light Engines and Land On Platform (latimes.com)
An anonymous reader quotes a report from Los Angeles Times: The center core booster of SpaceX's Falcon Heavy didn't land on a floating sea platform as intended during last week's first test flight because it ran out of ignition fluid, company Chief Executive Elon Musk said Monday. Musk took to Twitter on Monday morning to give a few more updates on the Falcon Heavy's first flight. After liftoff, the rocket's two side boosters touched down simultaneously on land, eliciting cheers and applause from the crowd of SpaceX employees gathered in the company's Hawthorne headquarters, as seen on the launch livestream. Those two boosters, which were used in previous launches of SpaceX's workhorse Falcon 9 rocket, will not be reused again, Musk said in a post-launch news conference last week. But the center core booster ended up hitting the Atlantic Ocean at 300 mph and about 328 feet from the floating platform where it was supposed to land. Musk said Monday that there wasn't enough ignition fluid to light the outer two engines of the booster "after several three engine relights."
Of the possible failures that could have occurred, this seems like the best one. This was the newest part on the whole 'kit' so it wouldn't surprise me if it was an issue in calculations or some minor mechanical issue that resulted in this. In the end this was still an 80% success and were this a commercial launch, the buyer wouldn't have been overly disappointed since the payload made it into orbit. I have no doubt the next launch will be a complete success with all 3 rockets landing without problem
Don't skimp on the metrics! The mission was 100% success given it launched successfully and put the payload into high orbit. All buyers would be perfectly satisfied with the result. The landings of 2/3 boosters is extra, and the reignition of the second stage to achieve Mars trajectory was extra - although the angle was slightly off. I'd grant these an additional 50% bonus so 150% successful mission far beyond anyone's expectations. Even Musk said he'd be happy if it blew up far enough from the launch pad to not cause damage.