R - 22 Tail Rotor Profile

Discussion in 'Hydrodynamics and Aerodynamics' started by Submarine Tom, Dec 16, 2012.

  1. Submarine Tom

    Submarine Tom Previous Member

    Robinson helicopters doesn't want to tell me what the section profile on their tail rotors is.

    Any ideas how I could acquire the NACA details for it?

    Thanks
     

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  2. Doug Lord
    Joined: May 2009
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    Doug Lord Flight Ready

    They may have designed it themselves so it may not correspond to any other foil-- NACA or otherwise.
     
  3. Frosty

    Frosty Previous Member

  4. Submarine Tom

    Submarine Tom Previous Member

    That's a good point Doug, thanks.

    I suppose on that note, I could just match it by eye and go from there.

    I wanted to know for my calculations.
     
  5. DCockey
    Joined: Oct 2009
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    Location: Midcoast Maine

    DCockey Senior Member

    What type of calculations are your doing, and for what purpose? That determines how accurately you need to model the section, and even if the section is needed.
     
  6. Submarine Tom

    Submarine Tom Previous Member

    Well, I found the main rotor: NACA 63 - 015

    Anyone for the tail rotor...
     
  7. El_Guero

    El_Guero Previous Member

    Measure it.
     
  8. Submarine Tom

    Submarine Tom Previous Member

    That's my plan if I can't get the number.
     
  9. johneck
    Joined: Nov 2011
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    Location: New England

    johneck Senior Member

    Can you measure chord and thickness? If so you should be able to at least get very close. As long as you have basic parameters (in cluding camber) right any calculations made will certainly be very close.
     
  10. Submarine Tom

    Submarine Tom Previous Member

    I have the wing in my possession, in fact I have four of them!

    Aren't there foil indexes?
     
  11. Submarine Tom

    Submarine Tom Previous Member

    FOUND IT!!

    It's a NACA 63-415

    Thanks everyone!
     
  12. johneck
    Joined: Nov 2011
    Posts: 240
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    Location: New England

    johneck Senior Member

    There are many ways to create a foil. You might want to measure chord, thickness and location of max thickness. Then estimate camber, and plot a sample section and compare it to the actual foil. Since the main foil is a 63 series, maybe the tail is too.

    There is a very complete index of commonly used air foils at

    http://www.ae.illinois.edu/m-selig/ads/coord_database.html

    and then this one

    http://www.ae.illinois.edu/m-selig/ads/aircraft.html#helicopters

    which says that the R-22 tailrotor is a 63-0015 ! wow jackpot!
     
    Submarine Tom likes this.
  13. johneck
    Joined: Nov 2011
    Posts: 240
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    Location: New England

    johneck Senior Member

    I guess I'm too slow.
     

  14. Submarine Tom

    Submarine Tom Previous Member

    Thanks for comin out there John Man!

    Happy holidays to ya!

    Seasons greetings and all that!
     
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