I just bought a used cx2, and after tuning it and putting everything in balance, I only moved the servo linkage out two holes. No parts, no money spent, well over 40 mph... Careful tho, trying to change direction at high speed can result in flybar contact with the LOWER rotors lol. Both rotors instantly stopped and the whole thing fell from street light height , the obstacle i was trying to avoid. Cost of damage? A few appropriate swear words as it fell and one lower rotor blade