Pretty much the above. Helicopter controls have a lever called the collective (as in collective pitch), usually with a throttle built into the lever to allow the pilot to compensate for changes to the rotor RPM caused by increasing/decreasing drag from altering the pitch. But most modern civil helicopters have various systems that would also handle keeping the RPM static without pilot intervention. I imagine military helicopters would always have those systems or even more advanced ones.
rankorcankor t1_ix8mejz wrote
Reply to comment by BoredCop in When a military helicopter fires thousands of rounds while hovering still, does the operator have to slow the rotor to compensate for weight loss? by Legitimate-BurnerAcc
Pretty much the above. Helicopter controls have a lever called the collective (as in collective pitch), usually with a throttle built into the lever to allow the pilot to compensate for changes to the rotor RPM caused by increasing/decreasing drag from altering the pitch. But most modern civil helicopters have various systems that would also handle keeping the RPM static without pilot intervention. I imagine military helicopters would always have those systems or even more advanced ones.