"Jim Burns" wrote in message
...

You're right. I guess it is my eyes which are out of whack.

You're right. I guess my numbers are out of whack!
I ran though them from memory, which is normally good, but sometimes very
short.

They saw
20GPH which is the "short hop" number.

This is what we are seeing on 1 hour flights with only one take off and
landing. Multiple take offs and landings, then numbers get lower due to
more time at reduced power. We've actually seen numbers down around 16
for
pattern only work.

I looked up a round robin flight of 2.1 hours each way, power settings I
recorded were 24/24 and fuel tickets showed 90 gallons, so I had one too
many 24's in my head, that figures out to 21.4 gallons at 155 True.

Longer trips we've been flight planning at 25gph and it's hardly ever that
high at normal cruise settings. Speed runs at 175 kts burns 27.

So, I believe that we are getting a 13% increase in speed for a 26%
increase
in fuel burn.

Thanks for makeing me look that up and correcting it. One problem we have
is the old fuel flow meters are wayyyyyyyy off towards the high side,
which
I guess may be on the safe side.


That is because the "fuel flow" guage in a Piper is really measuring fuel
pressure and displaying it in GPH. It is not a true fuel flow system. On
my Turbo Lance, I had a Shadin fuel flow system and it was dead accurate
while the stock guage always showed much higher numbers.

Mike
MU-2