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Nearly all round chutes have a peak vent, since before WW2. That vent lets them have a stable flow field so they don't oscillate around wildly behind the load they support.
The big slot around the girth does more-or-less what the multiple circumferential slots in a ribbon chute do: allow (reefed) opening in supersonic flow without "fatal" opening shock that blows the canopy to tatters. Both provide effective porosity.
The netting near the opening is a material that contributes to overall drag coefficient once the canopy is open and stable. I've used it in the form of grocery store grape bag netting as a tubular stabilizing drogue (sort of like a porous wind sock) all the way from 100 mph to Mach 1.4.
GW
GW Johnson
McGregor, Texas
"There is nothing as expensive as a dead crew, especially one dead from a bad management decision"
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Merlin 1D completes full mission duration test fire.
Hawthorne, CA – Space Exploration Technologies (SpaceX) announces that its Merlin 1D engine has achieved a full mission duration firing and multiple restarts at target thrust and specific impulse (Isp).
The engine firing was for 185 seconds with 147,000 pounds of thrust, the full duration and power required for a Falcon 9 rocket launch. The tests took place at SpaceX's rocket development facility in McGregor, Texas.
"This is another important milestone in our efforts to push the boundaries of space technology," said SpaceX CEO and Chief Designer Elon Musk. "With the Merlin 1D powering the Falcon 9 and Falcon Heavy rockets, SpaceX will be capable of carrying a full range of payloads to orbit."
Wonder what the new payload turns out to be. I imagine they didn't have in mind creating a 150 vacuum T/W engine when they first posted the payloads on their site. BTW, biggest T/W ever, and biggest mass ratio ever, all for one of the cheapest first stages to develop ever. Impressive, most impressive.
Rune. Video on the link.
In the beginning the universe was created. This has made a lot of people very angry and been widely regarded as a "bad move"
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