Recent content by rcgldr

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).

I'm not sure about the app in this case, but suspect that the acceleration is based on change in GPS speed versus time, as opposed to using an internal accelerometer, so it only calculates horizontal acceleration. My guess is the peak of the 1.41 g was due to the fact that the phone was strapped...

The early ones did Old EUC - SBU With the low foot pegs, the EUC couldn't be tilted much, and combined with the narrow tire couldn't turn as responsively. The advantage was it was much easier to learn on, as a rider could just step along with one foot or the other. Top speed was around 12...

Just the rate of acceleration or deceleration versus how far offset the riders center of mass from the tire contact patch has to be versus 1 g of acceleration or deceleration. I used numbers to simplify the math. This was in response to someone making a claim about braking distance (in English...

EUC stability. When riding at sufficient speed, about 8 mph | 12 kph for most EUCs, they become self-balancing left + right. An imbalance generally causes the EUC to tilt and turn into the direction of imbalance, and at sufficient speed, it becomes a self-correcting response. A rider can...

The reason for this is this is a response some making claims about braking distances at another forum, in English units. However, there is an phone based app that reports peak acceleration and deceleration in mph / sec or kph / sec, so I suggested he use the app to determine the rate of...

EUCs (Electric unicycles are programmed to remain vertical (or at some user set fixed angle), using accelerometers and gyros, similar to a Segway. If the EUC is tilted forwards, it applies or increases forwards motor torque to accelerate and return the EUC back to vertical. If tilted backwards...

Can someone here check my math? On an euc (electric unicycle), the motor has to exact the same amount of torque onto the wheel+tire that the rider exerts onto the euc, otherwise the frame would rotate (due to the motor exerting an equal in magnitude but opposite direction onto the frame than it...

At my first job in 1973, on a multi-computer multi-tasking database server using HP 2100s, the system had the advantage that it was offline from 3 am to 7 am each day allowing for offline backup. During that time, every disk pack was backed up to another disk pack (there were 10 drives, so 5...

Putting this into perspective. In 2001, quantum computers were able to factor 15 into prime numbers 3 and 5. As of 2025, they haven't been able to factor 21 (without the equivalent of guidance or pre-existing knowledge).