[NSRCA-discussion] Snap

[frank]

I've sometimes observed others doing very credible snap rolls. Let's just
say mine need some help and leave it at that . 

 

Snap rolls in pattern have always struck me as counter to the graceful "
flow of flight"( more like an interruption)  that precision aerobatics is
supposed to be about.

 

Maybe they should be excluded , after all , we're not 3 D 'n.

 

Frank

 

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ed Alt
Sent: Monday, October 12, 2009 4:38 PM
To: NSRCA List
Subject: Re: [NSRCA-discussion] Snap

 

Same problem exists with vertical snaps at the end of the box.  It is harder
to see, though not impossible.  It comes down to the pilot showing you the
maneuver for maximum score.  Just as it's hard to discern precision at a
great distance, for which there is a downgrade, so should not being able to
see a clean break be a downgrade.  
 
Ed
 

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Date: Mon, 12 Oct 2009 10:02:56 -0700
From: bob at toprudder.com
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] Snap


If the plane is in knife-edge flight, you are mostly looking at the top or
bottom of the plane. How can you observe a pitch break in that instance? If
the pitch break is the complete (or biggest) tell-all of a true snap, then
the maneuver schedule should be chosen to put the plane in the best position
possible to observe this criteria.



--- On Mon, 10/12/09, Ed Alt <ed_alt at hotmail.com> wrote:

 

So, in all seriousness this time, allow me to explain what happens in the
knife edge snap.  Here goes:
 
Short version: Everything works the same as a wings level snap. 
 
Longer version: The only difference is, the wing starts out completely
unloaded and rapidly transitions to being loaded due to the sudden pitch
change, and as it reaches the critical angle of attack, the same exact
things happen.  The autorotation is due to a wing panel stalling, and it
makes no fundamental difference which way the airplane is pointing when you
do it.  Now, you do need to perform the correct technique with the rudder
before & after to keep it flying on fuselage and propellor thrust vector
lift, lest the ground rise up and smite thy model.  
 
Ed
 

 

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