Repaired SpaceX Rocket Set for 2nd Blastoff Try on May 22


SpaceX engineers have successfully replaced a faulty valve in a first stage engine that triggered a launch abort on May 19 and that now clears the way for a second launch attempt of the firms Falcon 9 rocket and Dragon spacecraft in the overnight hours early on Tuesday, May 22.

Litfoff of the Falcon 9/Dragon duo on the first private rocket bound for the International Space Station (ISS) is slated for 3:44 AM on May 22 on the historic test flight mision dubbed COTS 2.

“We are ready for blastoff on May 22,” SpaceX spokeswoman Kirstin Grantham told Universe Today during an interview at Space Launch Complex-40 at Cape Canaveral, Florida earlier today as the Falcon 9 rocket was standing erect at the pad under a brilliant blue sky.

“The work to replace a faulty nitrogen engine valve is complete and took just a few hours,” Grantham confirmed to me.

After a thorough inspection of the vehicle and analysis of the repair, the SpaceX team cleared the rocket for launch. The rocket remained vertical during the repair work.

SpaceX engineers at work fixing failed rocket engine valve at Pad 40
A team of SpaceX engineers diligently assessed the cause of the May 19 launch abort for the Falcon 9 rocket poised at Pad 40 on Cape Canaveral Air Force Station. Credit: Ken Kremer/

The weather forecast has improved markedly to an 80% chance of favorable conditions at launch time because the chance of rain showers has decreased. The primary concern is for cumulus clouds.

The launch will be broadcast live on NASA TV and via SpaceX Webcast at

As on May 19, the launch window is instantaneous meaning SpaceX has just a fraction of a second to get the vehicle off the ground and there is no chance to recycle to a later launch time on the same day.

“The next possibility to launch after May 22 is on May 25,” said Grantham in the event of a scrub on Tuesday. “We could not reserve May 23 due to a conflict with Air Force requirements.”

The two stage Falcon 9 rocket is 157 feet tall. The first stage generates a million pounds of thrust from nine Merlin 1 C engines configured in a 3 by 3 by 3 arrangement.

The May 19 launch was aborted in a split second by the flight computer just 0.5 seconds before liftoff when they detected a slightly high pressure in the combustion chamber of engine number 5 located at the center of the first stage core.

If the launch proceeds as planned, the Dragon will separate from the Falcon 9 second stage some nine minutes after liftoff. Over the next two days, Dragon will close in on the ISS and then perform a series of complicated and stringent rendezvous and abort tests that bring the vehicle to within 1.5 miles and prove it can safely dock at the ISS and pull away in an emergency to prevent any chance of crashing into the ISS.

If NASA is satisfied with the test results, Dragon will be grappled with the robotic arm by US Astronaut Don Pettit and berthed at a port on the ISS on May 25. Astronauts would open the hatch on May 26 and begin unloading the nearly 1200 pounds of cargo consisting of non-critical items such as food, water, clothing and science experiments.

Remote cameras set up to photograph the SpaceX Falcon 9 liftoff from Pad 40 on Cape Canaveral Air Force Station on May 22 at 3:44 a.m. after launch abort on May 19. Credit: Ken Kremer

This is the first third test flight of the Falcon 9 rocket and the first test flight of the Dragon in this vastly upgraded configuration with solar panels.

Only four entities have ever sent a spacecraft to dock at the ISS – the United States, Russia, Japan and the European Union.

If successful, SpaceX will open a new era in spaceflight by giving birth to the first fully commercial mission to the orbiting space station complex and unlock vast new possibilities for its utilization in science and exploration.

SpaceX is under contract with NASA to conduct twelve Falcon 9/Dragon resupply missions to carry about 44,000 pounds of cargo to the ISS for a cost of some $1.6 Billion over the next few years.

The purpose of Dragon is to carry supplies to the ISS and partially replace the cargo capabilities of NASA’s now retired space shuttle. Dragon is a commercial spacecraft designed and developed by SpaceX that will eventually blast astronauts to space.

Ken Kremer

11 Replies to “Repaired SpaceX Rocket Set for 2nd Blastoff Try on May 22”

  1. I just want to point out that the third paragraph reads EXACTLY like a paragraph taken from a sci-fi story! 😀 Every day the world is becoming more like the world portrayed in the sci-fi stories of old! I am optimistic that before I’m 50 I will have been in Earth orbit at least once. At my most optimistic I can even envisage the initial serious planning of a space elevator starting before I die. I find it extremely ironic that companies are the thing which will take the dream dangled before the american people by their government to stimulate weapons research, back for the people. Hell, at this pace I might seriously start planning for practical immortality… 😀 😛

    1. Amazing, isn’t it? However, personally, the space elevator idea attempts to reduce space access costs for all the wrong reasons. It’s not the cost of fuel, nor the inherent nature of the ‘rocket’ itself: it is how it’s built, designed, operated, and contracted. Simply compare the launch costs of a Delta IV vs. a Falcon 9. We can imagine it being built COTS style, but may not be worthwhile if SpaceX succeeds in their affordable launcher ambitions. Perhaps when better calculations are made, the elevator may become even more expensive in the long-term than just launching a rocket. Besides, an elevator would require 100’s of launches to build, and a looming space debris catastrophe will need to be tackled, first. Then ‘rotovators’ may be a much more practical alternative. Indeed, we live in interesting times…

      1. We live in a beautiful, innovative, capitalitic world. Cherish it, for it’s the way it should be.

      2. Startram is also very appealing approach to space launching. Possible with current technology, not relying on anything hanging on orbit, or in atmosphere and costing as much as few weeks of war.

  2. I like the camera on the far left that’s encased in some kind of enhanced polymer containment membrane and metal impregnated high tensile strength adhesive strips.

  3. This is a true leap forward for humanity. Great job and long live capitalism, it powers science and the great nation America really is.

    Cheers from Greece.

  4. I can not wait, fingers crossed all goes well. This is indeed a historic moment but it is a shame that no one outside of space enthusiasts has any idea what is going on. SpaceX has the potential to change human history and create a new industry. This will be the catalyst for Bigelow to launch habitats for hotels and then support modules for lunar trips and not even the sky is the limit.

  5. This is a true leap forward for humanity. Great job and long live capitalism, it powers science and the great nation America really is.

    Cheers from Greece.

  6. Great that private enterprise is getting into the act.

    I suspect Von Braun would be underwhelmed. I certainly am. Folks, that might as well be a Redstone, or Jupiter or Juno, sitting there in the hot Florida sun.

    Where is Mr. Heinlein, when you really need him?

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