lml:

I saw the ATP turbo-prop engine at Oshkosk.  Impressive.
200 HP or 300HP (same compact size) and weighs just 200 lbs.

Neat electronic fuel injection system.

I asked about fuel economy, pariticularly at low power
settings and got this answer:

A turbine must spin fast , and once it
is spinning fast it always pumps plenty of air volume through.
Then you have to add some fuel to all that air to keep the fire
going. Cant let the mixture get too lean or you get no flame at all.
So there is a minimum fuel flow, which is largest at low altitudes,

So here is my question...  Can you put a butterfly
valve in the intake?  Then if you need endurance
(say to hold in IFR) you choke off airflow, the
turbine sucks a vacuum and the automatic injection
system will turn down the fuel flow.

-Jeff Peterson
LNC2 N273CK

ps the 200 HP ATP engine supposedly idles at low
altitudes at 7 GPH.