Stalled?

[Grow Pattern]

I think that we over use the word stalled without qualifying it.

We use it in;

1. The Stall-turn (Hammerhead) to mean that the plane stops climbing.

2. In a spin-entry to mean that it has slowed down, stopped flying and drops.

3. In the snap definition when the angle of attack is increased, regardless of speed change, to stop the flying surfaces from working normally. We say it is stalled. It is probably better described as a high-speed stall.

The truth of the matter is that we have model planes that can snap so quickly that we can't see all of the components. I filmed airshow pilots, IMAC pilots and Pattern pilots all doing snaps. The smaller the plane the less obvious it was that the plane snapped. You could see that it did not barrel or axial roll, but beyond that it was exceptionally hard to see a no-break error.

We owe it to the pilots to set a visual standard that we can all adhere to. Words are not enough for this problem

Regards,

Eric.
  ----- Original Message ----- 
  From: Archie Stafford 
  To: discussion at nsrca.org 
  Sent: Wednesday, December 29, 2004 10:34 AM
  Subject: RE: Displacement during snap rolls (was Why is it so quiet?)


  What I was trying to say is that there must be a very definitive break in pitch must be noticeable to guarantee a good score.  Certain judges were concentrating more on the break than I think they were the entire maneuver.  I understand that the aircraft does not have to have zero lift to stall.  Once again we come back to what is a snap and what is not.  I don't know how, but we will always have these discussions as long we have varying opinions of what is a snap and what is not.  It is one of those maneuvers that is very commonly scored a 9, 9 ½, and a 0.  The question is now figuring out which scores are right and which ones are wrong and how to get rid of the gap between the judges and to help the pilots to know exactly what everyone is looking for.

   


------------------------------------------------------------------------------

  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Dean Pappas
  Sent: Wednesday, December 29, 2004 10:22 AM
  To: discussion at nsrca.org
  Subject: RE: Displacement during snap rolls (was Why is it so quiet?)

   

  Hi Karl,

  You already know the answer to that! Rapid application of many "G"s causing the stall speed to rise.

  Of course, first you have to make lift to stall, which meand that you are starting to leave that perfect vertical line.

   

  Happy New Year

   

  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 Karl G. Mueller
    Sent: Wednesday, December 29, 2004 10:18 AM
    To: discussion at nsrca.org
    Subject: Re: Displacement during snap rolls (was Why is it so quiet?)

    All,

     

     

    I have a question on the aircraft to be in a "stalled condition during a snap roll":

    How do you get the airplane into a stalled condition on a vertical downline snap?

     

    Karl G. Mueller
    kgamueller at rogers.com

       
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20041229/2a54a7ed/attachment-0001.html