Turbulence.
My 1st thought is the downwind side of the working fans. That will slow the air through going through. Wind shadow. My open hand and part of my arm stretched out 1 meter behind a 1 meter prop makes a drastic difference in output.
My 2nd thought is the fans at the front will have less pressure, like that blowing shop-vac & ping-pong ball demonstration of Bernoulli's principle.
I find it a very interesting idea related to nose cones and such, and I have no clue if I'm thinking about it right.
Tracking isn't so bad. It is a lot more predictable than I thought.
No problems for me.
G-
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