[NSRCA-discussion] YS Questions+more - Rolls

[Nat Penton]

IMO center hinged or top hinged is OK. With top hinge, to achieve equal vertical travel of the trailing edge requires different angular travel, up vs down. The objective is zero aerodynamic differential.

Ron I don't think a fairing would prevent separation but, how are you able to fair the gap using the top hinge ?            Nat
  ----- Original Message ----- 
  From: ronlock at comcast.net 
  To: NSRCA Mailing List 
  Sent: Thursday, March 06, 2008 7:20 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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