Motorcycle push-steering verified using a dynamometer

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  • Опубликовано: 10 дек 2024

Комментарии • 2

  • @rcgldr
    @rcgldr 26 дней назад

    The direction of torque applied to the handlebars during a turn can remain the same, but the direction of the front tire changes from outwards to inwards. This should be obvious since the front of the bike moves in the direction the front tire is pointed (ignoring tire flex in high g turns), a bike doesn't turn left if the front tire is pointed right. The initial turning to the right steers the tires out from under the bike, causing the bike to lean left (and is what is taught at Motorcycle Safety Foundation), and once turned left, the front tire turns inwards to turn left. If you want to see this, attach a long thin stick pointed backwards from the center of the handlebars to see which way the front tire is steering. When a bike is leaned, the front tire steers inwards due to trail effect, and if unopposed would return the bike to vertical (self-balancing response), so the rider has to continue to exert some outwards torque onto the handlebars to reduce the inwards steering response to lean angle so that the bike hold the lean angle for a steady turn. To adjust the lean angle, steer more to lean less, steer less to lean more. Gyro related effect, mostly angular momentum, opposes the self-correcting response of trail effect, acting as a damper (stops wobbles). At high speeds (100+ mph), angular momentum cancels out trail effect, and in this case, the rider exerts a torque to initiate a lean, but once leaned, the rider stops exerting any torque as the bike will hold the current lean angle without any torque applied to the handlebars. The rider has to exert a counter-steering torque to make any change in lean angle. The magnitude of torque needed to decrease lean angle is the same as the magnitude of torque to increase lean angle at these speeds. Steering dampers (shocks between frame and handlebars used to stop wobbles) also resist trail effect, and the rider has to compensate with more counter-steering torque.

  • @microatmospherebreeze
    @microatmospherebreeze 2 месяца назад

    Great! You proved no countersteering ever occurs on a MC! Now clarify the action as pushing DOWN by using a weight, to show the PUSH is DOWN not FORWARD, like so many errantly claim. It is DOWN due to gyroscopic precession! The tilt AND steering must happen at the same time for maintaining BALANCE. To iniiate a turn the rider inputs any lean action, whenever the MC is inclined, the front wheel is auto-steered in that lean direction ONLY, NEVER does the wheel point in the opposite direction of the turn, which is what countersteering is.