Recent content by rcgldr

"The rear wheel is prevented from precessing by friction of the tires on the ground, and so continues to lean as though it were not spinning at all. Hence gyroscopic forces do not provide any resistance to tipping" Wiki - lateral gyroscopic effects What I consider to be a missing bit about...

The vertical axis torque exerted onto the gyro prevents any precession about the vertical axis. Two sources state that in this case, the gyro just falls as if it were not spinning. In addition to vertical forces related to gravity, there's also horizontal forces due to the support causing the...

In the case of a gyro and gravity, the torque required to prevent precession about the vertical axis, so that there is only precession about a horizontal axis. This requires that the precession about a horizontal axis results in zero net toque due to gravity, otherwise there would still be a...

"Gyro just falls" is a quote from the Caltech video. Since there is no horizontal component of precession, the torque related to gravity must be zero. This requires the precession in response to the torque about the vertical axis to accelerate the gyro downwards, as if it were "just falling".

The new part is that the torque opposing precession coexists with zero net torque in the direction of change of angular momentum (the direction of the original torque). The zero net torque in the direction of change of angular momentum is what I was missing before. In the case of gravity induced...

New to this thread: The law of torque versus rate of change of angular momentum still applies: the torque required to prevent precession is equal to the rate of change of angular momentum. Restated, the torque that prevents precession along one axis causes a gyro to instead to precess in the...

It's not just at Phsyics Forums, as for example, this graph of the monthly question rate at stack overflow:

From Caltech Feyman Lecture Hall - "You'll also notice that if I stop its precession, it simply falls"". A slightly out of balance gyro in this example so the rate of fall is slow. youtube - Caltech - stop precession In this 1974 Laithwaite lecture, he gets some stuff wrong, but in this video...

The formula for torque equals rate of change in angular momentum still applies, but when precession is prevented, the rate of change in angular momentum due to a torque perpendicular to what would otherwise be precession acts as if the gyro is not spinning and is just a function of angular...

As posted by jbriggs444, 18XL nominal (continuous) power is 2200 watts, peak power is 4000 watts. S18 Pro+ is nominal 2200 watts, peak power 5000 watts (higher peak power, hollow core motor). The EUC in question is the Inmotion P6, 6000 watts nominal (my guess this is a thermal limit), 20000...

The time was 2.04 seconds, but I don't know the resolution of the timer. On an EUC, the motor torque has to match the torque exerted by the rider onto the EUC. This particular EUC has a top speed ~93 mph, so at the test speeds, the acceleration is a function of how much torque the rider can...

EUCs also have 3 axis accelerometers and gyros, and use a algorithm to determine the direction of gravity so they can maintain a vertical orientation (relative to gravity). EUC reported acceleration isn't going to show a peak of 1.41 g though, so that had to be the phone. The zero to 30 mph in...

My guess is the manufacturers deliberately over-report speed, often around 10%.

Riders do that so they can monitor speed while riding. The monitored speed can be GPS or as reported by the EUC. The app has a correction factor for EUC reported speed that the rider calibrates by comparing GPS speed versus EUC reported speed and adjusts correction factor until they match. The...

The app could be using the 3 axis accelerometer and gyro MPU | MEMS chip in a phone, which can determine the direction of gravity and compensate. Again, that peak of 1.41 g was most likely due to the rider shoving his forearm forward at launch (the phone was strapped to rider's forearm).