Uneven surfaces can cause static pressure to vary with speed. There was an
article in ( I think) Business and Commercial Aviation saying that some
aircraft couldn't be RVSM certified, period, because of this issue.

Mike
MU-2


"Matt Whiting" wrote in message
...
Mike Rapoport wrote:

I have a friend who bought a CJ2 last month for about 5.3MM. The
$350K/yr is just assuming an interest cost a little below 7% it does not
consider ammortization of the loan. The RVSM comment was based on the
notion that the new jets all have RVSM or can have it added fairly easily
since they already have digital airdata. BTW getting RVSM on some older
jets is not trivial because the skins are not straight enough.. If you
are buying a $1MM airplane, $100K for RVSM is not trivial.

What does skin straightness have to do with it? It isn't obvious and I
couldn't find anything with a web search.


Matt