The reason I did sheet/graph 3 was that prior to 1990, you still had a
goodly portion of the GA fleet burning piston juice. Just about this time,
the folks who were flying "for real" and sucking most of the gas (i.e.
corporate, air taxi, freight...) converted to the more efficient turbine
juice. I know that is when the local firebombers converted from the S2F
with the Pratt&Scat round piston engines to the S2T Garrett?? turboprop and
the spotters converted from the Skymasters to the OV-2. That in and of
itself cut GOO's piston juice usage in half.

It was purely an arbitrary decision but one based on reality.

Jim

--
"Work like you don't need the money, love like you've never been hurt, and
dance like no one is watching."
--Satchel Paige
"Gig 601XL Builder" wrDOTgiaconaATsuddenlink.net wrote in message
...
RST Engineering wrote:
Tell ya what. Three spread sheets and three graphs of the
spreadsheets will be posted to www.rstengineering.com/photos in
fifteen minutes. Take a look at the straightness of the line since
1990.
Jim

If you did the same with the data from 83 to 87 it would have been at zero
in 91 or 92 and that was a much straighter line. No doubt GA is in
trouble. What are we going to do about it?