SpaceX is at it again. Love it or hate it, Starlink is growing again. The company is getting ready to launch the next batch of 60 satellites into orbit in just a few days.  The original launch was postponed until after the successful launch of the crew dragon Demo-2 mission for NASA.

 Now that the astronauts successfully docked with the International Space Station, SpaceX turns its focus back on Starlink.  This launch, originally planned to launch before the Crew Dragon Demo-2 mission, now looks promising for a launch this week.

Yes, that’s right. The classic NASA “worm” logo is back! An image of the revived NASA worm logo was released on Twitter by NASA Administrator Jim Bridenstine as well as press release on the NASA.gov website.

NASA explained that original NASA insignia is an iconic symbol widely recognized in the world. The NASA “meatball” logo as many know it by represented patriotic American colors. A red chevron wing piercing a blue sphere(Planet) with white stars, and an spacecraft orbiting. This “meatball” logo was not easy to reproduce with 1970’s technology so the Federal Design Improvement Program introduced in 1975 a new logo, the “worm.”

1. Grasshopper Successes: The two videos below show that the early landing trials aka Grasshopper from several heights between 250m and 1,000m.

The lessons here are:

a) Pinpoint landing of a 1st stage rocket is technologically feasible.

b) This 1st stage rocket has to attain zero vertical velocity at a minimum 250m above the barge.

Video of 250m test

Video of 1,000m test

2. Falcon 9 1st stage crash landing — 1st attempt: SpaceX tells us that the failure was due to a hard landing (see video below) but at 0:03 minutes into the video one can see that the 1st stage has substantially tilted before it hit the deck i.e. the 1st stage did not tilt because it hit the deck.

The lessons here:

a) A wobble — a dynamic instability — occurs before landing.

b) The guidance systems are unable to cope with new wobble.

Video of 1st attempt

3. Falcon 9 1st stage crash landing — 2nd attempt: The video of the second attempt (below) confirms that indeed a wobble has been introduced before the stabilization fins are deployed. Further, this deployment exacerbates the wobble, and the guidance systems is unable to handle this exacerbated wobble.

The lessons here:

a) 1st stage vertical velocity needs to be zero by at least 250m above deck.

b) The stabilization fins need to be redesigned to alleviate exacerbation.

c) Like the Space Ship One’s shuttlecock approach, the 1st stage upper fins need to be deployed before the lower fins are.

d) Upgrade the landing guidance system to account for more severe wobbles.

If at a minimum, SpaceX achieves zero velocity at 250m before deployment of landing gear it will be successful. The other recommendations are good to have.

I expect SpaceX to be successful by their 3rd try.