On Mon, 16 Feb 2004 20:59:55 GMT, "Bob Gardner"
wrote:

The range for any aircraft is dependent on power setting (and fuel
available, of course). If speed is not important, you could operate at
50-percent of max power and get astounding range...but few pilots are
willing to make that tradeoff.

Bob Gardner


bob my experience doesnt support that.

I fly a Wittman W8 tailwind with an O-200.

flying between Ceduna and Forrest via Nullabor Homestead is about 297
nautical miles.
I have made the flight with two settings.
-at reduced rpm (about 1800rpm) and about 70 knots. (in company with a
piper cub)
-at cruise rpm (2500 rpm) and 114 knots.
weight and aircraft trim was just about the same.

believe it or not the fuel consumed was the same.

reducing your rpm gets you more time aloft but does not increase your
range.
it seems to take the same amount of energy to move the aircraft the
distance. all you vary with rpm is the rate of energy conversion and
the air speed.

another point pertinent to the original posters question.

the fuel bill for a thorp T18 with an O-360 engine and a W8 Tailwind
with an O-200 engine is about the same for the flight across
australia.
the thorp cruises around 180 knots and does the trip in 1 day. I
cruise at 114 knots and it takes 2 days.
it astounds me that the fuel consumed is about the same.

of course these flights are made upside down (downunder) and our
Lycoming and Continental engines might be different from yours.
....and these are both taildraggers. :-)
ymmv
Stealth Pilot
Australia.