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

[Ed Alt]

For certain, there is a pitch change somewhere in the maneuver, but there 
isn't a sudden pitch break or autorotation that I can see. I don't think the 
wing ever stalled.

----- Original Message ----- 
From: "Bob Kane" <getterflash at yahoo.com>
To: <discussion at nsrca.org>
Sent: Tuesday, August 16, 2005 7:30 AM
Subject: Re: Snap or not (since we have nothing better to do)


> 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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