Questions tagged [grid-fins]

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24 votes
2 answers
16k views

How are the SpaceX Falcon 9 Mod 3 and Mod 4 grid fins different?

Elon Musk tweeted "Flying with larger & significantly upgraded hypersonic grid fins. Single piece cast & cut titanium. Can take reentry heat with no shielding." These have been commonly known ...
geoffc's user avatar
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18 votes
2 answers
3k views

On the Falcon Heavy, why are the side boosters using Ti Grid fins, but not the center core?

Elon Musk showed a picture of the almost ready to fly Falcon Heavy in the HIF (Horizontal Integration Facility, aka rocket barn). You can see the darker, larger grid fins on the side cores, and the ...
geoffc's user avatar
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13 votes
1 answer
2k views

Why didn't Saturn V have grid fins? Long March and Soyuz do!

From the question What are these four “waffle-like” structures on top of the Long March 2F just launched? and @RussellBorogove's answer there we can see that the Long March 2F carrying the Shenzhou-11 ...
uhoh's user avatar
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9 votes
1 answer
894 views

What are these four "waffle-like" structures on top of the Long March 2F just launched?

Near the top of the Long March 2F rocket (middle of the fairing?) that launched today with the Shenzhou-11 crew, there are four square wafffle-like structures that remind me of grid fins. What are ...
uhoh's user avatar
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16 votes
1 answer
1k views

What do the Teeth on the SpaceX Falcon Mod4 do?

Can someone explain the purpose of the 'teeth' seen in the last picture of this answer? Do they have a specific name? They look too far up to be used to grab anything since the rockets land ...
Tom Pridham's user avatar
5 votes
1 answer
795 views

Why are the cells on grid fins square in shape?

What is the reason for the square shape of the cells on grid fins such as those on the Falcon 9 landed by SpaceX, on missiles, or other places?
Max's user avatar
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11 votes
2 answers
1k views

Is SpaceX grid fin material flammable?

I was looking at the Thaicom 8 falcon 9 launch and landing, trying to get a bit more info about the trajectory the first stage takes. The camera is however damaged and we miss most of the atmospheric ...
Perttu Yli-Opas's user avatar
4 votes
1 answer
1k views

How do the F9 grid fins extend and rotate?

How do the F9 grid fins extend and rotate? When the vehicle launches they are flat against the surface of the vehicle. As the first stage begins reentry, the fins extend and start 'flying' the ...
grid fin's user avatar