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What are these protruding elements from SU-27's tail?


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I recently saw in person SU-27 belonging to the Ukrainian Air Force. I spotted some protruding elements from its tail and I'm wondering what are they called and what do they do?



Protruding elements from SU-27's tail










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    $begingroup$


    I recently saw in person SU-27 belonging to the Ukrainian Air Force. I spotted some protruding elements from its tail and I'm wondering what are they called and what do they do?



    Protruding elements from SU-27's tail










    share|improve this question







    New contributor



    BassAstral is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






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      5








      5





      $begingroup$


      I recently saw in person SU-27 belonging to the Ukrainian Air Force. I spotted some protruding elements from its tail and I'm wondering what are they called and what do they do?



      Protruding elements from SU-27's tail










      share|improve this question







      New contributor



      BassAstral is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      $endgroup$




      I recently saw in person SU-27 belonging to the Ukrainian Air Force. I spotted some protruding elements from its tail and I'm wondering what are they called and what do they do?



      Protruding elements from SU-27's tail







      military fighter feature-identification russia su-27






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      BassAstral is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          1 Answer
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          $begingroup$

          I believe that these are static discharge wicks. You can see similarly sized/shaped wicks on a 1/32 scale models of the SU-27, as discussed here, but, more importantly, you can find them labeled with number 53 on the cutaway drawing below. The label is written as Разрядники статического злектричества, which, according to Google Translate, is "ESD arrestor" (or static discharge wick).



          enter image description here



          These are distinct from the shape of the wicks found on most GA aircraft in the US (just a straight stub of wire, potentially with some insulation around the base), but, as discussed on Aerospaceweb, the shaping of the wick (particularly the inverted cone shape shown here) contributes to increasing the gradient in the electric field from tip to base of the wick. This encourages accumulated charge to migrate back into the atmosphere from a controlled point and decreases interference with on-board electronics and radio systems.






          share|improve this answer











          $endgroup$











          • 1




            $begingroup$
            These are indeed static discharges as can be seen in this cutaway (number 29)
            $endgroup$
            – DeepSpace
            2 days ago












          • $begingroup$
            Thanks! I've added it to the answer.
            $endgroup$
            – Marius
            2 days ago






          • 1




            $begingroup$
            ah, the good old days when aviation magazines has real content
            $endgroup$
            – jwenting
            2 days ago










          • $begingroup$
            Oops -- noticed that the cutaway that was up for an SU-35. Corrected!
            $endgroup$
            – Marius
            yesterday














          Your Answer








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          1 Answer
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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          8












          $begingroup$

          I believe that these are static discharge wicks. You can see similarly sized/shaped wicks on a 1/32 scale models of the SU-27, as discussed here, but, more importantly, you can find them labeled with number 53 on the cutaway drawing below. The label is written as Разрядники статического злектричества, which, according to Google Translate, is "ESD arrestor" (or static discharge wick).



          enter image description here



          These are distinct from the shape of the wicks found on most GA aircraft in the US (just a straight stub of wire, potentially with some insulation around the base), but, as discussed on Aerospaceweb, the shaping of the wick (particularly the inverted cone shape shown here) contributes to increasing the gradient in the electric field from tip to base of the wick. This encourages accumulated charge to migrate back into the atmosphere from a controlled point and decreases interference with on-board electronics and radio systems.






          share|improve this answer











          $endgroup$











          • 1




            $begingroup$
            These are indeed static discharges as can be seen in this cutaway (number 29)
            $endgroup$
            – DeepSpace
            2 days ago












          • $begingroup$
            Thanks! I've added it to the answer.
            $endgroup$
            – Marius
            2 days ago






          • 1




            $begingroup$
            ah, the good old days when aviation magazines has real content
            $endgroup$
            – jwenting
            2 days ago










          • $begingroup$
            Oops -- noticed that the cutaway that was up for an SU-35. Corrected!
            $endgroup$
            – Marius
            yesterday
















          8












          $begingroup$

          I believe that these are static discharge wicks. You can see similarly sized/shaped wicks on a 1/32 scale models of the SU-27, as discussed here, but, more importantly, you can find them labeled with number 53 on the cutaway drawing below. The label is written as Разрядники статического злектричества, which, according to Google Translate, is "ESD arrestor" (or static discharge wick).



          enter image description here



          These are distinct from the shape of the wicks found on most GA aircraft in the US (just a straight stub of wire, potentially with some insulation around the base), but, as discussed on Aerospaceweb, the shaping of the wick (particularly the inverted cone shape shown here) contributes to increasing the gradient in the electric field from tip to base of the wick. This encourages accumulated charge to migrate back into the atmosphere from a controlled point and decreases interference with on-board electronics and radio systems.






          share|improve this answer











          $endgroup$











          • 1




            $begingroup$
            These are indeed static discharges as can be seen in this cutaway (number 29)
            $endgroup$
            – DeepSpace
            2 days ago












          • $begingroup$
            Thanks! I've added it to the answer.
            $endgroup$
            – Marius
            2 days ago






          • 1




            $begingroup$
            ah, the good old days when aviation magazines has real content
            $endgroup$
            – jwenting
            2 days ago










          • $begingroup$
            Oops -- noticed that the cutaway that was up for an SU-35. Corrected!
            $endgroup$
            – Marius
            yesterday














          8












          8








          8





          $begingroup$

          I believe that these are static discharge wicks. You can see similarly sized/shaped wicks on a 1/32 scale models of the SU-27, as discussed here, but, more importantly, you can find them labeled with number 53 on the cutaway drawing below. The label is written as Разрядники статического злектричества, which, according to Google Translate, is "ESD arrestor" (or static discharge wick).



          enter image description here



          These are distinct from the shape of the wicks found on most GA aircraft in the US (just a straight stub of wire, potentially with some insulation around the base), but, as discussed on Aerospaceweb, the shaping of the wick (particularly the inverted cone shape shown here) contributes to increasing the gradient in the electric field from tip to base of the wick. This encourages accumulated charge to migrate back into the atmosphere from a controlled point and decreases interference with on-board electronics and radio systems.






          share|improve this answer











          $endgroup$



          I believe that these are static discharge wicks. You can see similarly sized/shaped wicks on a 1/32 scale models of the SU-27, as discussed here, but, more importantly, you can find them labeled with number 53 on the cutaway drawing below. The label is written as Разрядники статического злектричества, which, according to Google Translate, is "ESD arrestor" (or static discharge wick).



          enter image description here



          These are distinct from the shape of the wicks found on most GA aircraft in the US (just a straight stub of wire, potentially with some insulation around the base), but, as discussed on Aerospaceweb, the shaping of the wick (particularly the inverted cone shape shown here) contributes to increasing the gradient in the electric field from tip to base of the wick. This encourages accumulated charge to migrate back into the atmosphere from a controlled point and decreases interference with on-board electronics and radio systems.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited yesterday

























          answered 2 days ago









          MariusMarius

          2,8639 silver badges21 bronze badges




          2,8639 silver badges21 bronze badges











          • 1




            $begingroup$
            These are indeed static discharges as can be seen in this cutaway (number 29)
            $endgroup$
            – DeepSpace
            2 days ago












          • $begingroup$
            Thanks! I've added it to the answer.
            $endgroup$
            – Marius
            2 days ago






          • 1




            $begingroup$
            ah, the good old days when aviation magazines has real content
            $endgroup$
            – jwenting
            2 days ago










          • $begingroup$
            Oops -- noticed that the cutaway that was up for an SU-35. Corrected!
            $endgroup$
            – Marius
            yesterday














          • 1




            $begingroup$
            These are indeed static discharges as can be seen in this cutaway (number 29)
            $endgroup$
            – DeepSpace
            2 days ago












          • $begingroup$
            Thanks! I've added it to the answer.
            $endgroup$
            – Marius
            2 days ago






          • 1




            $begingroup$
            ah, the good old days when aviation magazines has real content
            $endgroup$
            – jwenting
            2 days ago










          • $begingroup$
            Oops -- noticed that the cutaway that was up for an SU-35. Corrected!
            $endgroup$
            – Marius
            yesterday








          1




          1




          $begingroup$
          These are indeed static discharges as can be seen in this cutaway (number 29)
          $endgroup$
          – DeepSpace
          2 days ago






          $begingroup$
          These are indeed static discharges as can be seen in this cutaway (number 29)
          $endgroup$
          – DeepSpace
          2 days ago














          $begingroup$
          Thanks! I've added it to the answer.
          $endgroup$
          – Marius
          2 days ago




          $begingroup$
          Thanks! I've added it to the answer.
          $endgroup$
          – Marius
          2 days ago




          1




          1




          $begingroup$
          ah, the good old days when aviation magazines has real content
          $endgroup$
          – jwenting
          2 days ago




          $begingroup$
          ah, the good old days when aviation magazines has real content
          $endgroup$
          – jwenting
          2 days ago












          $begingroup$
          Oops -- noticed that the cutaway that was up for an SU-35. Corrected!
          $endgroup$
          – Marius
          yesterday




          $begingroup$
          Oops -- noticed that the cutaway that was up for an SU-35. Corrected!
          $endgroup$
          – Marius
          yesterday










          BassAstral is a new contributor. Be nice, and check out our Code of Conduct.










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