2020年9月28日 · The grid fin sticks out into the airflow, and each can rotate separately. This changes the angle of the fins inner walls to the air flow, which redirects part of the airflow at an angle. The air pushes back against the fin when being redirected, which is …

2018年12月8日 · The size of the grid part of the fin is 1.2 x 1.5 x 0.25 m From the photographs, the metal in the grid itself constitutes approximately 5% of the volume, (less on the free end, more on the end with the shaft) The density of titanium is 4.5 g / cm^3 From this data, the grid itself weighs about 100 kg

2021年2月15日 · The grid fins will help guide the superheavy booster back to the launch/landing pad from the edge of space, similar to how the grid fins on a Falcon 9 work. These seem to be super skookum given the material and thickness, interested to see the entire structure.

2021年4月12日 · Coincidentally, the F9 grid fin picture you posted shows a great example of ‘the actual curve of the fin itself,’ which IS for moving the oblique shockwave downstream of the fin at late transonic to early supersonic speeds. This curve of the fin is what allows the fins to have a larger ‘ideal velocity' operating range than standard flat fins.

Compact "waffle-iron" aerodynamic control surface, acts as a wing without needing to be as large; also, "grid fin" Decronym is a community product of r/SpaceX , implemented by ^request 3 acronyms in this thread; the most compressed thread commented on today has 33 acronyms.

2017年9月7日 · The grid fin isn't a pure blunt profile. It is somewhat sloped, so instead of a ratio of 3.5, lets guess that the Cd ratio is more like 2X. That suggests that the aerodynamic drag from the 4 grid fins, is 2 x 11 = 22% of the booster core.

Interesting to note that the Aluminium grid fins had significant damage in certain squares near the edges, and those squares seemed (to me) to have a damaged "twin" in the same position on the opposite edge of the fin. There might be some sort of resonance in the grid fin at particular hypersonic airflows that causes issues at those points.

2022年12月29日 · The better question is why aren't Super Heavy's grid fins titanium. The Falcon 9's grid fin's are one of the largest single piece cast titanium parts ever made. Super Heavy's grid fins are several times larger so casting them out of titanium isn't practical or even possible with current manufacturing techniques.

2020年6月14日 · I'm trying to do a falcon 9 recreation and I've got some decent landing legs and the booster is really easy to do. However, I don't know how to go about doing the grid fins. I've tried using structural panels which are rotated by a servo, I've tried building it out of wing parts and using ailerons, I've tried using a girder to get the fin look.

2022年4月28日 · Grid fins have a much more compact structure so should be lighter for a given deflection force than a long fin. A long fin will also extend beyond the top of the interstage which is quite short on SH and about to get shorter with the shallower design of the top dome.