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

[Doug Cronkhite]

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
 
 


  _____  

From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of Dean Pappas
Sent: Wednesday, December 29, 2004 1:15 PM
To: discussion at nsrca.org
Subject: RE: Displacement during snap rolls (was Why is it so quiet?)


Thanks Doug,
You don't happen to have the piece of text in a form that could be pasted
into this forum, do ya'?
 

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 4:14 PM
To: discussion at nsrca.org
Subject: RE: Displacement during snap rolls (was Why is it so quiet?)


No track downgrade Dean. Since a snap roll is a yaw induced maneuver (or
should be at least) it's nigh-impossible to actually snap the airplane and
not displace the line a little. Especially when you consider the low weight
and inertia of our airplanes as compared to full scale.
 
-Doug
 
 

 

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