What is the mechanism principle of the grid fins in F9? or how to design the mechanism for the electricity grid fins? or how to design a electricity folding wing like the grid fins in F9?

  • $\begingroup$ So you want to know about how the grid fins are designed, instead of what their function is? $\endgroup$ – Hobbes Aug 30 '17 at 12:13
  • $\begingroup$ What do you mean by 'electricity grid fins'? That makes no sense. $\endgroup$ – Hobbes Aug 30 '17 at 12:14
  • $\begingroup$ Voted to reopen, the modified question is no longer a duplicate. $\endgroup$ – Hobbes Aug 30 '17 at 12:14
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    $\begingroup$ Not voting to reopen. The question is still very unclear. mechanism principle? electricity grid fins? electricity folding wing? Probably a language barrier, but that has to be resolved first. $\endgroup$ – user10509 Aug 30 '17 at 13:15