[NSRCA-discussion] YS Questions+more - Rolls

[george w. kennie]

A top hinged aileron will actually present a greater surface area to the airstream when deflected upward than downward producing induced differential which CAN be beneficial, relative to design force parameters.
G.



  ----- Original Message ----- 
  From: ronlock at comcast.net 
  To: NSRCA Mailing List 
  Sent: Thursday, March 06, 2008 8:20 AM
  Subject: Re: [NSRCA-discussion] YS Questions+more - Rolls


  And while your at it, I'd appreciate some discussion of the impact of the top hinge system as seen on Viavat, and Prestige birds -     (top hinged, with fairing that eliminates the gap at deflection)

  Thanks, Ron Lockhart

    -------------- Original message -------------- 
    From: vicenterc at comcast.net 

    Nat,

    Could you explain why the differential should be different for non-center hinged?  I understand that the mechanical configuration of non-center hinged requires differential to obtain same travel in both directions.  However, the travel up and down should be close to equal.  

    Thanks,

    --
    Vicente "Vince" Bortone

      -------------- Original message -------------- 
      From: "Nat Penton" <natpenton at centurytel.net> 

      Tom
      It's just something that is peculiar to the Southern Hemisphere.

      Changing wing incidence will not help. Unless things are really screwed up <G>, at our roll rates, centrifugal forces are too low to cause a problem. You want zero differential, aero speaking ( same up/down if center hinged ).

      I find the best check is the fast half-roll in the vertical up.        Regards     Nat
        ----- Original Message ----- 
        From: Koenig, Tom 
        To: NSRCA Mailing List 
        Sent: Wednesday, March 05, 2008 7:24 PM
        Subject: Re: [NSRCA-discussion] YS Questions+more


        Hi Troy!

        Thanks for the info. I thought you would be toiling away on the next developmental stage of these engines!!

        Hopefully soon, I can find the time to get flying again. I am looking forward to running this little beast. I am still a little concerned in keeping it quiet though.

        Four blade props? I have some of the 18.1 x 12 two bladers but I just cant see how I'll shut the thing up with these paint stirrers??

        Also-one more question to any of you out there in pattern land.

        I have struggled with aileron differential for years. I am just not happy with the rolls. I have tried various design fixes-but about the only one that seems to work is to get the wing back to 0-0 ( which can be achieved by a few ways, design, mix or thumbs) Differential itself does not seem to work if the wing is POA ( well...it works for half the roll !)
        Another black magic fix appears to be to run parallel ailerons-but this only 'sorta' seems to fix it. I like the feel of equal% chord ailerons however.

        I am frustrated with it-I like my planes to roll as if they had a string up its ...........well you know!

        OK-any 'secrets' I need to know??? Very good elevator work fixes it ( hence my 0-0 comment)

        Tom


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