Sustaining Knife edge?

[Ihncheol Park]

I have a question to ask.
Flying condition was very good.  Almost no wind on ground level, maybe a few
MPH in the air (flying height).  Wind direction left to right.
When I fly knife edge from right to left facing the top of the plane, very
little rudder is required to stay on without going up or down.

However, from left to right facing the top, the plane just can not stay and
keep dropping.

What could be the cause of this?
Side thrust?


Thank you,

Ihncheol Park


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