@thenated0g - Pretty sure he had mixed the ailerons to add rudder. This is the default settings for the plane. If he did that like I told him, then you would have been flying with rudder.
Here is my best answer. Yes, it will fly without rudder, but it will not fly as well, and not look as much like a real bird. I tend to fly mine with just rudder and elevator when I want to make it look like a real bird. Or better yet, just small rudder inputs.
The Seagulls can fly fast, they can do basic acrobatics, they can do inverted passes, but they look kind of dumb doing those things. I want mine to look and fly like the real thing, and for me rudder is key to that.
I have honestly not played with the mixing much, just what the designer spec'd out in the instructions. Fine tuning differential should help avoid issues with unwanted yaw inputs from the ailerons, it is very possible to get better performance via some tuning.
I had a super light stock bird (the one I sold) and I have a 60% "baby" bird that has higher wing loading. They seemed to fly about the same, but the bigger was a little more relaxing in flight.
Anyhow, they are a ton of fun.. Super easy to paint too, a bit of black spray paint will do the trick for the wings. Light misting until you get the shading you want. Takes less than a minute!
