Re: [Phys-L] Video Analysis of Album Cover Flight and Glider Stall

[brian whatcott <betwys1@sbcglobal.net>]

I looked at the trajectory, and didn't see the expected recovery from 
the dive as air speed rises which could lead to a repeated stall.  It 
seems that this could be the flight profile of an air vehicle with a C 
of G well behind its center of lift so that it cannot regain airspeed or 
an aircraft that stalls into an un-recovered spin. This DID remind me of 
the path of a boomerang, which slowly climbs while circling out of the 
wind, followed by a steep slow descent near the start point, so that 
people who throw them can often catch them between clasped hands.

Brian W

On 2/6/2020 10:22 AM, Steinert, Jeff wrote:
> This is likely a question for JD, but all responses are appreciated:
>
> My students are using video analysis in Logger Pro to explain the flight of
> a projectile of their own choosing. One has flown an album cover and
> produced a rather complicated trajectory that can be viewed here:
> https://docs.google.com/document/d/1FCZhpNazYJajSGyo8tdHiWpq1mXD-kw3rHfC7Wi7Vsg/edit?usp=sharing
>
> I searched the net for a graphical depiction of the trajectory for a
> stalling glider with no luck and I'd like to give my student a place to
> start in her search for an explanation using the forces acting on her album
> cover. Does the above plot resemble what you'd expect to see for a stalling
> glider? Something else?
>
> Thanks,
>
> Jeffrey J. Steinert
> Physics Instructor
> 11th Grade Team Leader
> Science Department Co-Chair
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>
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