RE: Good intermediate 4 channel plane
Here are 4 models that I think would be good for a 2nd plane. Some of them you will have to keep the control throws down until you are more comfortable with them. But on "low rates" they should be pretty gentle. If you taught yourself on the slow-v, then you should be able to handle theese OK. Some may suggest a 4 ch trainer type plane, but really... it's not neccicary. 3ch and 4ch control very very much the same.
Once you decide on which plane to get. Let us know if you need help selecting a power system for it.
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