The same thing happened to me as a beginner; strangers gave me advice. I don’t recall it ever being bad advice. The kid who mentioned (to Spinningwoman?) that the unicycle wasn’t a free wheel … was onto something … most people don’t quite get that, and as a result, they think unicycling is more dangerous than it really is. A stranger just asked me, yesterday, if we freewheeled going downhill. I told him that freewheeling represented a super high-level form of technique, something I may never be able to do.
Slipping back: as a beginner, it took me 30 minutes to be able to replicate my successes from the previous day.
Spinningwoman: It’s hard to get advice which is timed exactly right. I’m interested in your distance limit. If it were a matter of each pedal stroke having a certain probability of success, then I would expect you to have experienced a few, randomly long launches. But, instead, there is the limit. So, the question is, why?
Do you tend to fall toward the left or right at the end of your rides? Do the balancing motions of your arms get larger from the moment you launch to when you dismount? Does your speed keep increasing during the ride? Do you tend to end your short rides with either the left or right foot in the downward position? Is there any hint of left-right steering currently in your technique? Are particular muscles tiring out during your short runs?
At the expense of repeating what’s already been said, here are some take-or-leave suggestions, based on what worked for me:
During the period when I couldn’t control my speed, it helped to launch into a slight uphill. The added resistance of the slope helped control speed and get more feedback between my feet and the pedals.
You might consider counting “complete” pedal circles, rather than 1/2 cycles. It is possible this could change the cyclical motions of your body while you’re riding.
Start practicing idling: Don’t expect to learn to idle…but idling forces you to feel the physics of having the unicycle out too far in front of you, then making a correction. During idling, that correction is performed by pedaling backwards; while riding forward, back-front correction is more subtle, involving a letting-up of forward pressure, or a small amount of back pressure, on the pedals. Make sure to hold onto something, at this point, while practicing idling. Most beginners are way more accustomed to the physics of fall-forward = pedal-faster. Practicing idling may help you learn the feeling of letting-up/backward pressure on the pedals. When my 13 yr. old neighbor rode 50 feet, I noticed that, on some of his more successful runs, he briefly stopped pedaling partway through the ride, letting his inertia and his outstretched arms momentarily keep him balanced; then he started pedaling again, riding further. Otherwise, he kept getting faster until he lost control.
Spinningwoman: sounds like you’re more consistent right now. That is good news!