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Re:Watch SpaceX’s Falcon 9 Rocket Land on Barge in New 360-D... by jessriedel on Saturday April 30, 2016 @10:40AM (#11601836)
I believe it rests under its own weight and friction. In an interview, Musk said the acceptable wave height was 2-3 times higher than the ones seen during that landing.
Re:Watch SpaceX’s Falcon 9 Rocket Land on Barge in New 360-D... by stuff4ben on Saturday April 30, 2016 @11:21AM (#11602028)
I'm a little skeptical about that. You can clearly see the rocket slide as it lands.
Re:Watch SpaceX’s Falcon 9 Rocket Land on Barge in New 360-D... by jpgvm on Saturday April 30, 2016 @11:37AM (#11602101)
It still has surplus horizontal velocity when it hits the deck, hence the sliding. [1] Musk confirmed on Twitter that the rocket in fact doesn't need securing and the metal shoe plan turned out to be unnecessary.

[1]: https://twitter.com/elonmusk/status/726218218109444096

Re:Watch SpaceX’s Falcon 9 Rocket Land on Barge in New 360-D... by kolinko on Saturday April 30, 2016 @12:56PM (#11602454)
I wonder how they determined that it's unnecessary. Did they try to topple it over?
Re:Watch SpaceX’s Falcon 9 Rocket Land on Barge in New 360-D... by gizmo on Saturday April 30, 2016 @01:12PM (#11602516)
Really heavy objects with a low center of mass don't just topple over. It's 42 meters tall and weighs around 20.000 kg without fuel.

http://spaceflight101.com/spacerockets/falcon-9-v1-1-f9r/