Question: Glider model where k=0

Here is a link to a maple file I found describing what happens to a glider where k=.9--->

I would like to see what happens to the same glider when k=0.---->

***k is the strength of a propeller.

How do I determine whether or not it is a sink/source/spiral/etc based on the eigenvalues?
I was trying to use this site for help.

Also, I followed the same format and when graphing, set my theta(0) values to the theta I chose yet my graph does not look too good. Anyway to improve the graph so I better see what the glider is doing for each color?

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