Sorry to hear of your problems. It can be very frustrating when you are new.

The Challenger definately has more than enough power for ROG or hand launch. After 300+ launches, I think I can confirm that.

1) have you checked the allignment of your tail surfaces?

2) If you have replaced the tail, you may need to trim it. That is different than trimming the rudervator ( moveable surfaces)

3) Are you hand launching the plane at an upward angle? that would be wrong. Launch out flat with a good solid push and be careful that you are not releaseing the plane down. This is a dart throw not a baseball throw.

4) You MUST launch into the wind, not with it. The wind should always be in your face

5) launch at full power. In fact you can glide that plane on a good throw with the motor off, but I don't recommend that as the launch method.

6) 6 or 7 cell battery. It flies great on either.

7) If you crashed it, you may have broken the boom lose. If it is not locked back into place, the tail will droop which is the same thing as having full down elevator on all the time. If you can rotate the tail boom at all, it has broken lose.

8) if there are any creases in the tail, these can flex when you try to work the surfaces. Tape may not be enough to support this.

OK that is enough to get you started.