Fin Resonance

Discussion in 'Beginners & Educational Programs' started by Seyhun Gültekin, Aug 20, 2019.

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  1. Aug 20, 2019 #1

    Seyhun Gültekin

    Seyhun Gültekin

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    Hello everyone we preparing our national model rocket competition in Turkey (aka Teknofest).Our rocket will finish soon but we consider about fin resonance due to motor ignition.Fins are made %100 carbon fiber.Anybody reasearch that resonance and what we should do for minimize resonance ? (ı add fin photo for our rocket)
     

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  2. Aug 20, 2019 #2

    Nytrunner

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    How fast will you be flying?

    And is that a picture of a single fin? It looks very thick. I wouldn't expect it to flutter (the effect of resonance) until very high speeds.
     
  3. Aug 20, 2019 #3

    Seyhun Gültekin

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    thanks for your answer we will fly under 1 mach ( apprx 0.5 mach)
     
  4. Aug 20, 2019 #4

    mccordmw

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    Carbon fiber
    Looks like a really short span
    Mach 0.5

    Unless your fins are paper thin, that's not going to flutter.
     
  5. Aug 20, 2019 #5

    UhClem

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  6. Aug 20, 2019 #6

    manixFan

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  7. Aug 21, 2019 #7

    Seyhun Gültekin

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  8. Aug 21, 2019 #8

    dhbarr

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    At 600kph with ( what appear to be ) solid Through-The-Wall carbon fiber fins you should have nothing to worry about.

    I would at least round that leading edge though, as thick as those fins are they will produce quite a lot of drag.
     
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  9. Aug 21, 2019 #9

    Funkworks

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    Is anyone is actually equipped to measure or simulate resonant frequencies for model rockets?
     
  10. Aug 21, 2019 #10

    dhbarr

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    Funkworks and mccordmw like this.

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