goldguy posts a nice
tutorial here...
#3 Rolling the NutBall is an easy to do and basic maneuver. Once you've mastered it, the roll becomes the basis for the snap roll, spins, inverted flat spin (complete with sound effects), the inverted 'elevator', both up and down, plus other silly weird stuff.
Rolling is more than just slapping over the rudder stick with the NB, although with models like the Simple Delta, flat and with elevons, that's all it takes to look good. What you want is to practice nice smooth rolls where the speed of rotation is the same throughout the 360 degrees of travel, it can be done almost axel, it's all in the timing and rolling to the left is easier to start off with. Make sure you set the CG at 25 percent to start, you can modify that as you progress, fly the maneuver at a MEDIUM speed at first and pay attention to the amount of movement on the rudder and elevator, not too much (???) is lots. The big problem in rolling the NutBall is that with too much rudder throw it wants to flip over very quickly once past inverted. How much movement is all apart of fine tuning. Having a low wing loading is a big aid in flying aerobatics as everything is much easier to do. If there's too much of a breeze, mount a bigger battery or some lead ballast, keeping the CG unchanged.
So, here's what to do to start off with.....................
Fly along straight and level at a brisk speed, but not full tilt (yet), and just before you enter the roll, add a tiny bit of up elevator to rise the nose, then feed in the rudder nice and smooth and when it goes inverted give it a tiny blip of down elevator and let off on the rudder just after is goes past inverted. What you need to do in the beginning is to form a pattern or tune in your brain. Practice in your shop with the model in front of you, try and picture in your mind what's happening. I learned four point rolls by repeating this to myself as I moved the sticks in the proper sequence and at the proper speed................ta da, ta da, ta da, ta da. It's like a tune in your head and you keep to the timing. Not sure what key I'm in, but it works. Got that from the best 3D pilot I know.
When you go out to practice, by yourself seems best and concentrate on the one thing and do just that.
#4 Here's another easy fun one anyone can do, the 'upright elevator', although it's all down elevator, no up. You'll need a rearward CG for this one, but start off with what you've got to see the difference it makes. Gain lots of altitude and point the nose straight into the wind. Now, hit full up and hold, and kill the thottle at the same time (again, it's in the timing) and use just the rudder to keep it facing into the wind. It should float down like a leaf, and with a low wing loading and a nice breeze you can plop it right down on the wheels. You can do this one inverted too.
blogodex = {"toc":"Nutball", "idx":"GoldGuy"};
.jpg)
