"Big John" wrote in message
...
Don't laugh.

Anti Gravity has been demonstrated in the lab.

Long way from the market but remember when the transister first came
out and people said what can you do with that.

No, they didn't. By the time the transistor had been invented, vacuum tube
had already been proven VERY useful in a wide variety of applications. A
transistor is just a very compact vacuum tube (minus the empty space, of
course ), at least in terms of function.

But even if that had been the case, the issue with anti-gravity isn't that
people say "what can you do with that?" I think pretty much everyone can
see lots of applications for anti-gravity. The real problem is that,
unlike the transistor, any theoretical demonstration of anti-gravity has
been in a context with no hope of real-world application.

The only real problem with a roadable airplane is practicality. Even cost
isn't insurmountable, since plenty of people spend plenty of money on plenty
of luxuries. There's obviously a size point at which a roadable car would
work; after all, in the worst case you just build an airplane large enough
to carry a car (which has already been done, of course).

The practicality problem comes in with respect to the fact that even people
who spend lots of money on luxuries don't like spending more money to solve
a problem than they really need to. And no matter what you do, it will
"always" be less expensive to hire a limo at your destination than to fly an
airplane that can turn into a limo at your destination. ("Always" in
quotes because, who knows?, maybe limos will get REALLY expensive some day).

Pete