This instrument serves to determine the overload (g-load) in aerobatic flight of aircraft. When the plane is flying at constant velocity, weight 1 is held by springs 3 and 4 in its neutral position so that hand 9 indicates a g-load of unity. When the plane is executing some aerobatic maneuver, weight 1 is subject to inertia forces. Due to these forces weight 1 overcomes the resistance of spring 3 or 4 and turns lever 2 about the axis of shaft 6. Lever 2 is connected to shaft 6 by sleeve 5. Through gear segment 7 and pinion 8 rotation is transmitted to hand 9 which indicates the g-load due to the maneuver of the plane.
$1781$GL,M$