RE: park zone fw190 rtf
gsmith: It sounds like you're stalling on launch, to prevent that there's couple things you should think about. First: these models are not greatly overpowered (stock), so you need to launch them at full throttle. Second, you can't just stand there and throw it, it won't have enough airspeed to stay in the air. You need to do a running launch with these, take at least a few running steps before you toss the airplane, it makes a surprising difference. Third, the throw: you should toss the airplane almost level, with only a slight angle of attack. If you toss it UP, it will stall and crash.
As to your other question, be soft on the controls at launch as much as you can. If you jam full-up elevator as soon as it's in the air, it's going to stall and crash; give it a gentle straight climb until it's well up to speed and has some altitude.
Oh, and finally, make sure your battery is fully charged and in good condition (and your motor/prop too). If you're not making good thrust, the launch will fail and it'll crash.