Sturgeon Posted November 27, 2014 Report Share Posted November 27, 2014 Oh also there's some autonomous drone oil rig platform spaceport thing, too. Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted November 27, 2014 Report Share Posted November 27, 2014 Why Russians have a belly laugh over this news? Can somebody explain, i am not into flying things. Except when they are nuclear powered Soviet strategical bombers. Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted November 27, 2014 Report Share Posted November 27, 2014 The Russians have been big on grid fins for a while now, e.g. AA-12 Adder, and I think some anti-shipping missile I can't remember (because shooting at airplanes is sexier than shooting at ships). I think grid fins work well at high speeds for the same reason twin tails do on supersonic fighters; the shock waves reach such an angle that the fins/potato masher lines no longer interfere with each other. BUT WE WOULD KNOW FOR SURE IF A REAL AEROSPACE ENGINEER POSTED HERE. Sturgeon 1 Quote Link to comment Share on other sites More sharing options...
LostCosmonaut Posted November 28, 2014 Report Share Posted November 28, 2014 BUT WE WOULD KNOW FOR SURE IF A REAL AEROSPACE ENGINEER POSTED HERE. I have a degree, but no actual working experience. Nevertheless, I shall try. So far as I know, the main benefit of grid fins (as opposed to normal fins) is that the moments on the control surface are much lower, due to the shorter longitudinal axis of the fins. This means that your control actuators can be smaller, thereby saving weight (a pretty big deal on a launch vehicle). I believe the Soyuz launch abort system also used grid fins. Fakeedit: wiki confirms Quote Link to comment Share on other sites More sharing options...
xthetenth Posted November 28, 2014 Report Share Posted November 28, 2014 I believe they also handle better at extreme angles of attack, helping the maneuverability of missiles, such as the R-77. Quote Link to comment Share on other sites More sharing options...
LostCosmonaut Posted November 28, 2014 Report Share Posted November 28, 2014 I believe they also handle better at extreme angles of attack, helping the maneuverability of missiles, such as the R-77. True, although if a Falcon 9 is at extreme angles of attack in a flight regime where the fins have effective control authority, the RSO is probably going to get involved soon. Quote Link to comment Share on other sites More sharing options...
Xlucine Posted November 29, 2014 Report Share Posted November 29, 2014 The rocket goes hypersonic backwards? She says they're only for re-entry at 1:30 Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted November 29, 2014 Author Report Share Posted November 29, 2014 The rocket goes hypersonic backwards? She says they're only for re-entry at 1:30 The rocket stage reenters "nose" first. Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted January 20, 2015 Report Share Posted January 20, 2015 There's some interesting discussion of the actuation of the grid fins here. Quote Link to comment Share on other sites More sharing options...
Xlucine Posted January 20, 2015 Report Share Posted January 20, 2015 I didn't know about open hydraulic systems before, but I'm glad I do now Quote Link to comment Share on other sites More sharing options...
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