if you can manage to adjust the center-of-gravity of the whole mass I think a dead person can even drive it as long as the road is free from obstacles. On Tue, Jul 9, 2013 at 6:55 AM, RussellMc wrote: > > http://www.dailymail.co.uk/sciencetech/article-2358172/The-wheeled-electr= ic-scooter-thats-cross-Segway-unicycle--apparently-impossible-fall-off.html > > FWIW their "Segwaay does not do ..." statements are false - but Segway do= es > it largely in front-back direction. > > To perform an emergency stop it MUST accelerate first. > > I'm pretty sure I could make one fall over :-). > > I've managed a full double tank slapper at 50 mph on an (almost ordinary*= ) > motorbike (and didn't come off) which seems about impossible so suitably > inverted logic suggests an incredibly stable one should respond to invers= e > treatment :-). Yes. Doesn't quite make sense - basically you need to eith= er > push it into a state where (1) its control loops can't track fast enough = OR > (2) where the outcome of a manouver is not predicted correctly soon enoug= h > (which leaves you in situation 1). > > Probably eg a hard leaning fast left turn then a braking right turning si= t > up where you are trying to effectively U turn hard to the right. If you c= an > apply body torque to the handlebars -as it looks you can, then you get so= me > say as to what it is trying to do. Quite why you'd want to fall off in su= ch > a manner I know not :-). > > A "bike" that you cannot fall off you are at the mercy of. > > Back to work ... > > > Russell > > * TY250 trials bike. Gravel road (Shell 500 Kawhia - Raglan for locals). > Slightly downhill. 50 mph. Rough. VERY steep rake so front wheel contact > patch and steering head line of pivot are almost concentric so you can pu= sh > the handlebars around at speed in a manner not really possible on more sa= ne > motorcycles. Hit a suitable rock or pothole (as I must have) and wheel ca= n > be kicked hard sideways to almost 90 degrees (as it's a trials bike), > bounce off turn stop and flick back the other way for a 180 degree repeat > then settle down and listen to the rider's VERY frantic attempts to regai= n > control. Less skill involved than it would have appeared if anyone had > noticed - surviving that has got to be very largely luck. > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .