Snao G's

[Ken Thompson III]

Matt,
I could be wrong, but isn't 3D, by definition, done in a constant state of stall?  Wouldn't that eliminate a lot of the high G's in the maneuvers?  I wouldn't think the airframe would be in as stressed state, when the flying surface is depending on prop wash, not air speed, to do it's thing.

Ken
  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Friday, January 28, 2005 1:46 PM
  Subject: Re: Snao G's


  If this accelerometer is finding 13 G loads generated by a Pattern model snap, a relatively low amount really, I imagine that a 3D model set up for a full array of stunts has to be experiencing double that at least.

  Earl could you do any 3D type maneuvers and measurements with the Yak?

  Very informative discussion BTW, and may result in improved more efficient building technique, read-- lightest for the desired strength.

  thanks

  matt

  In a message dated 1/28/2005 1:32:35 PM Eastern Standard Time, d.pappas at kodeos.com writes:
    That's proof of stall!
    If the G loading rises suddenly, and then holds or droops continuously during the roll, then it's probably an accelerated barrel.
    If the profile is sudden rise, sudden drop to maybe 1/2, then onload, you have a real snap.

    Yia,
        Dean

    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 Rcmaster199 at aol.com
      Sent: Friday, January 28, 2005 11:45 AM
      To: discussion at nsrca.org
      Subject: Re: Snao G's


      Good point. Once in the stall, the model should not see the same continued G load. Should drop dramatically. If the plane doesn't stall to begin with, different story.

      Matt

      In a message dated 1/28/2005 11:23:25 AM Eastern Standard Time, d.pappas at kodeos.com writes:
        Let me add another two cents worth ...
        Earl,
        What is the sampling rate on your data logger?
        Can you see if the maximum 13-Gs at 100 MPH was sustained for the entire half second or so that it took to complete the snap,
        or was it a short spike (like 0.1 second)  and then sustained at say half of that value, for the rest of the snap.
        Of course, if the data logger samples once a second, we have almost no way of knowing.

        Later,
                Dean
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