Definition
A rotating handgrip control, most commonly the throttle on a helicopter's collective lever, that varies engine power when the pilot rotates it about its long axis. Rolling the grip one way increases fuel flow and engine speed; rolling it the other way decreases it.
Plain English
A handle you twist to control engine power, like the throttle grip on a motorcycle. On a helicopter, it sits on the end of the collective lever and is twisted with the left hand to add or reduce power.
Context Anchor
Commonly encountered in helicopter cockpit descriptions, startup procedures, and power-control discussions.
Why Pilots Care
It lets the pilot change engine output smoothly without releasing the collective lever, maintaining precise control of rotor speed.
Analogy
Works like a motorcycle throttle: rotate the grip toward you to add power, away from you to reduce it.
Intuition Check
A twist grip is not just any grip that can be twisted. In this aviation use, it means a rotating power-control handle.
Example Sentence 1
As the pilot raised the collective for takeoff, he rolled on the twist grip to add power and hold rotor RPM in the green.
Example Sentence 2
In autorotation, the twist grip was rolled back to reduce power before touchdown.