Snap or not (since we have nothing better to do)

[Bob Kane]

First, let me say I do not have the correct answer,
I'm posting this so we can all study an example.

Here is the definition from the competition guidelines
. . . 

"The track visualized as the path of the Center of
Gravity (CG) should ideally follow the geometric
flight path of the maneuver while the nose and tail
autorotate through opposite helical arcs around the
flight path. A snap that does not show a break and
stall to initiate the snap, but does enter a stalled
attitude during the maneuver is severely downgraded.

2. If the stall does not occur and the model
barrel-rolls around, the maneuver is zeroed. A barrel
roll can be identified when the CG, the nose and tail
scribe the same helical path through the required
rotation of the maneuver."

I see a pitch break (nose pulls up), and the plane
finishes the rotation nose high with the tail coming
up slightly after the rotation stops.

The tricky part is the plane is definitely defining a
cone shape during the rotation. But the nose, CG, and
tail are on the same arc, not opposite arcs as
described above. The point of the cone is several feet
in front of the plane.

How do you catch this in the fraction of a second it
takes to do the maneuver?

I will try and catch a correct snap (if such a thing
exists) on video and post when I can.

 
--- Ed  Alt <ed_alt at hotmail.com> wrote:

> Looks like a real tight and fast barrel roll.  Can't
> discern any pitch break 
> leading to autorotation.  Must have had some rudder
> in it, you can see an 
> opposite kick at the end to get back on track.
> Ed
> ----- Original Message ----- 
> From: "Bob Kane" <getterflash at yahoo.com>
> To: "nsrca" <discussion at nsrca.org>
> Sent: Monday, August 15, 2005 11:45 PM
> Subject: Snap or not (since we have nothing better
> to do)
> 
> 
> >I have a short wmv video taken during the NATS of a
> > snap during the Master's Reverse Avalanch. The wmv
> > file is posted here:
> >
> > http://home.wyan.org/~rkane/video.html
> >
> > Is it a snap or not? You can control the playback
> > speed in Windows Media player for a better look by
> > turning on the play speed controls under "View",
> then
> > "Enhancements", then turning "Play Speed Settings"
> on.
> > This will give you frame-by-frame control. Watch
> it
> > both at full speed and then frame by frame.
> >
> >
> > Bob Kane
> > getterflash at yahoo.com
> >
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Bob Kane
getterflash at yahoo.com


		
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