http://www.dailymail.co.uk/sciencetech/article-2358172/The-wheeled-electric=
-scooter-thats-cross-Segway-unicycle--apparently-impossible-fall-off.html

FWIW their "Segwaay does not do ..." statements are false - but Segway does
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 inverse
treatment :-). Yes. Doesn't quite make sense - basically you need to either
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 enough
(which leaves you in situation 1).

Probably eg a hard leaning fast left turn then a braking right turning sit
up where you are trying to effectively U turn hard to the right. If you can
apply body torque to the handlebars -as it looks you can, then you get some
say as to what it is trying to do. Quite why you'd want to fall off in such
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 push
the handlebars around at speed in a manner not really possible on more sane
motorcycles. Hit a suitable rock or pothole (as I must have) and wheel can
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 regain
control. Less skill involved than it would have appeared  if anyone had
noticed - surviving that has got to be very largely luck.
--=20
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