If this was the case ("truly incapable") they would not allow the use of a
ground adjustable prop. At least with some planes, while you would be
incapable to exceed the speed limitation with a certain prop pitch setting,
resetting the prop may allow you to exceed it. This may not be different
than a "ground adjustable" RPM limiting device.

Frank

"Russell Duffy" wrote in message
.. .
...
...
I even asked AOPA this exact question about this a week or so ago,
and their opinion was that the plane would have to be truly incapable of
exceeding the speed limit, rather than just an RPM limitation. I think
there's some room for debate on that, particularly if it's not a "normal"
well defined aircraft engine.

Cheers,
Rusty