Hi Valen

I haven't seen the Thielert engine but I have flown in the SMA engine powered
C182 and have some data that is pertinent.  One is that so far, all of the
diesel powered planes will be turbo'd (great news!) but if you have an engine
out above 15,000', they can't restart if they get cold.  Remember that they
are compression ignition systems and without enough air to compress at higher
altitude, no ignition.  All are working on solutions so don't be too worried
yet.  The other thing (at least told to me by SMA), is that they require a
LOT more air to cool them than do gasoline engines.  The C!82 had a new LARGE
intake that was BUTT UGLY!!!  It doubled the intake size and if this has to
be done on the gorgeous lines of my Lancair, I'll take gasoline.  But this
too may be solved elsewhere.

On the plus side, it was no noisier inside than the typical Witchita Spam can
and outside with a 2200 RPM rotational speed, the prop was quieter and more
efficient...once the correct prop was tweeked.  Note that a new prop will
have to be designed for it because the lower RPM and superior efficiencies
won't be realized until the correct prop is on it.

All the stuff you mentioned is correct.  I did some calculations
extrapolatiing given data from the HP and speed for the ES and Super ES and
given HP reduction at altitude.  If the turbo is capable of giving 300 HP at
10,000' (an increase of 34% over the IO-550), the plane should realize just
under a 10% increase in speed.  That is it should cruise at almost 210 kts.  
The range at economy cruise should be close to 2000 miles with extended range
tanks.  Of course you also need to consider that Jet A is much heavier than
gasoline so you may loose some payload with full tanks.

Dan Newland
Super ES