I pulled this comment (Dated June, 2004) from the RV-list archives:

Quote:
At SNF this spring I asked the ATP guy what speed & fuel burn they are
now getting in their RV-4 now that they have fixed the exhaust angle. He
said that they were burning 14gph at 140 mph. I believe that the hp
required to fly a -4 at 140 mph is well under 100.
Endquote.

Bottom line is that a converted military APU isn't going to have anywhere
near the fuel consumption of a modern turbine like the Allison, and even the
Allison still can't match the Lycoming...

KB


"Richard Riley" wrote in message
news
The operative word here is "claim."

The best that Allison can do with the 250 is an SFC of .61-.67.
That's with four to six-stage axial, one-stage centrifugal
compressors, a two-stage low pressure turbine, and a two-stage high
pressure turbine. If they really think they can get SFC comparable to
piston engines, they're deluded or lying.

On their old ATP webpage they're listing an SFC of down to .46.
That's insane.

In short, yes, it's too good to be true.

On Tue, 06 Jul 2004 02:41:13 GMT, Paul Folbrecht
wrote:

:Not twice. They claim 13gph. That's not too shabby at all. And I'm
:never gonna run out of fuel - that is NOT one of my concerns. I worry
:about the issues I have no direct control over.
:
:
:Kyle Boatright wrote:
:
: "Paul Folbrecht" wrote in
message
: news :
:Anybody have any experience?? Yet?? Is it too good to be true - a
:205hp turnbine for $30K?
:
:I'm thinking of putting one in an RV-10. Or a Glastar Sportsman. Or a
:KIS Cruiser.
:
:~Paul Folbrecht
:~PP-SEL
:~C152 89795
:~MWC
:
:
: This brings to mind the fact that a lot more airplanes crash for lack
of
: fuel than because of mechanical related engine failures. You're
trading
: something like 2x the fuel burn for potentially more mechanical
: reliability...
:
: KB
:
: