how helicopters work
So. Helicopters. The main rotor generates lift by spinning aerofoils through the air, creating a pressure differential between the upper and lower surfaces. The tilted rotor allows vectoring of lift for forward flight, and the tail rotor counteracts torque to prevent fuselage rotation. Collective pitch controls altitude while cyclic pitch controls attitude.
... and she's laughing.
She has that expression again, a question mark face that fools me every single time, because apparently I'm a golden retriever who never actually considered the ball might be thrown on purpose.
By the fourth time she asked, she knew more about helicopters than most people should. She asked anyway. The corner of her mouth would do the thing, but I wouldn't notice, and I began the lesson.
The difference between interest and an obsession is availability. An interest can be set down, picked up later, discussed as it comes up. Not an obsession. Picks up on the first ring, doesn't check whether now is a good time. What I can tell you is that a particular kind of knowledge just lurks in me, under pressure, waiting for a question to open the valve, and the question need not be sincere. Helicopter is the codeword, the activation phrase.
She could have asked about literally anything else. Would have answered like a normal person. She asked about helicopters. Became a documentary.
She knows. She was doing that, a bit, a bid, a generous thing, where she finds exactly where I light up and she just watches. Because she finds it's worth seeing? Retriever-baiting, technically. Not sure what to call it, or how I feel about it. Some kind of warmth-as-ambush, a kindness-trap. I'm the mark.
The tail rotor, without it, the whole fuselage would just spin; you'd be completely unable to control it, because the torque from the main rotor would… she's laughing, already collapsing in laughter, and I'm three sentences in before I can catch myself.
Even now, writing this, I am explaining helicopters to no one, to myself, the valve has opened. I don't know how to close it, and I'm not sure I