RaceKraft 5051 tri-props on some old 2100kv Sunnysky motors.
120 yards between goalpost in 3 seconds = approximately 80 mph (129 kph).
2100kv is like low gear – very slow – better for slow but punchy maneuvers. Can’t wait to try this with some fast motors (EMAX 2600kv’s coming soon).
https://pinshape.com/items/29604-3d-printed-birdbone-helium-210-fpv-quadcopter