Originally Posted by nagromnewo
Right answer, wrong explanation!
All FP helicopters will naturally drift to the left on takeoff. The bumps are there to lean the helicopter a bit to the right so it takes off more vertically. It will still drift a bit to the left, so you need to counter with right aileron, but the bumps help.
No expert here, but I think all single rotor heli's (FP and CP) have that tendency, due to tail rotor? (Maybe less so for CP for various reasons.)