wrote in message
...

Now, I *would* consider a turbo aircraft to circumvent the problems that
you're likely to have at high DA's. A turbo-*NORMALIZED* engine isn't
inherently much
harder on the engine. You're limited to sea-level manifold pressure, but
you can make
it at higher altitudes. About the only way that it's harder on the engine
is
decreased cooling due to thinner airflow, and increased intake air
temperature due to
the turbo. The former you're kinda stuck with, the latter can be helped
with an
intercooler. Both of which become more important the higher you go, but
for
relatively small increases (say, to decrease the effective DA from 12000
to 6000), it
wouldn't be hard on the engine much at all.

http://www.aopa.org/pilot/bonanza/turbo_primer.html

I like the fact that a turbo-normalizer:
- Does not have to lower the compression ratio of the engine
- Usually has a stone-cold simple control.... just another throttle to
twist when you
run out of MP
- Is not required at all times to make full, rated HP (at sea-level).

I don't know what aircraft are often found with them, but I suspect
they're
somewhat scarce and impractical to add yourself.

Bonanzas primarily. One really nice thing is a TN makes lower altitudes
practical; no need to go to 12-15K feet

Beryl d'Shannon (sp) and TurboAlley are the two biggies with STC's.

I've had a TN IO-550 for just under 1700 hours now and it's been nothing
short of amazing. So far, none of the "horror stories" that Doug Paterson is
worried about. Thing is, a TN unit will run about $30K up to $45K installed.



Matt
---------------------
Matthew W. Barrow
Site-Fill Homes, LLC.
Montrose, CO