This is a interesting artical on the small turbine engine;
Jim Hergert
(example)
Building on this work, Innodyn has developed the
500-shp TwinPack, which combines two of its 250-shp turbines through a common
gearbox. The two-engines-in-one powerplant is estimated to consume about 35 gph
at full power, about the same as 500-shp versions of the venerable Pratt &
Whitney Canada PT6A. Testing of a prototype TwinPack is scheduled to start later
this year, according to Grose.
The TwinPack weighs in at about 330
pounds, which is slightly heavier than a 500-shp PT6A at 286 pounds. However,
the Innodyn engine is more compact, with dimensions of 29 inches long, 24 inches
wide and 14 inches high. The PT6A is only 19 inches wide but 62 inches long,
requiring a much longer engine compartment. This can especially be a problem
when re-engining aircraft with the P&WC engine.
For complete artical, go to;
Aviation International News is a publication of The
Convention News Co.,
In addition, I have a P&W PT6 publication that
shows the LB/ESHP/HR for all the PT6 engines. They put them in three classes,
Small, Medium, and Large. The Thermodynamic Equivalent Specific Fuel
Consumption, ESFC ranges form .66 for the Small class to .52 for the Large
class. Large is over 1000HP. That is about as good a Specific as I have heard
about with turbines. I think the Garrett 331 gets down to .50 LB/ESHP/HR.