Displacement during snap rolls (was Why is it so quiet?)

[Bob Pastorello]

Matt, that comment makes perfect sense.
    But what design parameter would be changed to limit/stop/defy the physical principles of inertia and momentum??

I don' thin' u'r gonna git ther'.....

Bob Pastorello
NSRCA 199  AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Wednesday, December 29, 2004 6:58 PM
  Subject: Re: Displacement during snap rolls (was Why is it so quiet?)


  Wait a minute, we are not talking about flying Pattern with Decathlons and Cubs. Pattern models are supposed to be "thoroughbred" designs. We have very few limits as to what we actually design in. On the other hand, Scale models don't have that "free to design as you please" luxury. 

  Pattern planes have no excuses. I see no reason the desired features can't be designed in to facilitate desired outcome.

  MattK

  In a message dated 12/29/2004 5:10:04 PM Eastern Standard Time, d.pappas at kodeos.com writes:
    Thanks Doug.
    And yet we know that the full scale guys' snaps happen in geologic time, compared to us!
    Imagine the plight of diving judges.
    Maybe the solution is to "wimp-out" the snap description, and allow anything that looks like a train wreck ... NAAAAAH!

    Dean Pappas 
    Sr. Design Engineer 
    Kodeos Communications 
    111 Corporate Blvd. 
    South Plainfield, N.J. 07080 
    (908) 222-7817 phone 
    (908) 222-2392 fax 
    d.pappas at kodeos.com 

      -----Original Message-----
      From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Doug Cronkhite
      Sent: Wednesday, December 29, 2004 4:33 PM
      To: discussion at nsrca.org
      Subject: RE: Displacement during snap rolls (was Why is it so quiet?)


      The rules for family 9.9 are as follows:

      "Snap rolls represent one of the greatest challenges to judge. This is primarily due to two factors: (1) the "snapping" characteristics of different types of aircraft are unique; and (2), snap rolls are a high energy maneuver that occur very quickly. Snaps happen so fast, in fact, that is is virtually impossible for a judge to determine the exact order in which events occur, especially at the beginning of the snap. There are no criteria, therefore, for seeing nose and wing movement initiated at the same time as with the other autorotation family, Spins."

      The rest of the paragraphs deal with snaps not autorotating through the complete revolutions and so forth but there is no criteria whatsoever for line displacement. This would be impossible to deal with actually since aircraft snap so differently from one type to another. A top level unlimited airplane like an Edge, Cap, or Sukhoi displaces very little, but people flying lower classes in Decathlons, Clipped Wing Cubs and so forth displace a great deal in a snap. There's just no way to fairly judge with a single standard across all aircraft types.

      -Doug
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