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

[Grow Pattern]

It looks like the snap starts when the plane is level. It should start just 
before the plane is level to be in the center of the bottom of the loop.

Most of what is written about snaps in junk. Rick Allison defined the 
shallow snap years ago. I have yet to see it improved upon.

It's a flick roll!


Eric.

----- Original Message ----- 
From: "Ed Alt" <ed_alt at hotmail.com>
To: <discussion at nsrca.org>
Sent: Tuesday, August 16, 2005 8:14 AM
Subject: Re: Snap or not (since we have nothing better to do)


> 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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>>
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