RE: New Flip 3D
With 3D-type planes, such as the Kyosho Flip 3D, power management is the key. On all such models, a too-high flight speed will quickly encourage flutter of the control surfaces. That's just something you have to live with when you have one of these types of models. Make sure your control links and pushrods are slop-free.
Most flying is done at 1/2-3/4 throttle, with full throttle being used only for the initial part of the takeoff until you get airborne (if then), and for verticals. With an especially powerful engine, even verticals won't need full throttle. With a good setup, you can hover at arount 3/4 throttle or slightly less, and then climb out by adding more.
Dual rates are considered a must by many fliers so that takeoffs and landings are easier. With the large control throws needed for 3D flying, they can make landings a bit touchy unless you have a very fine touch on the controls.
The Flip's a fine airplane, and you should get a lot of enjoyment out of it.