Two-man crosscut saw — 1.5-2 meters long. Handle on each end. One pulls, other pushes. Rhythm: back-forth, back-forth. 40 cm diameter tree down in 15-20 minutes.
Why Not Chainsaw
Chainsaw — noise, gas, maintenance, $400. Crosscut saw — silence, water (lubricant), sharpen once a season, $80. Chainsaw is 5x faster. But an Amish man doesn't need to fell 50 trees a day. He needs 5 — and to talk with his son while sawing.
Social Tool
The crosscut saw is the only tool you can't use alone. Not a bug — a feature. Two people work together, match each other's rhythm, learn trust. Father teaches son not sawing but cooperation.