Interesting.
Your fuel burn vs speed is identical to mine; climb rate slightly less and
top speed slightly more .
4000 to 5000 also almost doubles fuel burn rate on mine, which is a 912S.
Assuming your figures are in US gal.
Duncan McF.
----- Original Message -----
From: "GLENN CROWDER" <gcrowder2@hotmail.com>
Subject: Europa-List: Fuel economy tests with Subaru and Catto prop
>
> Last Saturday morning I took up a 210 lb passenger for my first dual
> flight with a new Catto 3 bladed fix pitch 64 x 62 prop. This prop has a
> large amount of twist, starting with about 45 degrees at the root. I only
> had 8 gal total in the tank and pumped up the monowheel to 25 lbs. DA was
> 6600 ft and OAT about 80F with no wind. We were at full gross. The
takeoff
> roll was up to about 1000 ft, could have been shorter, but I held it on
the
> runway probably longer than necessary for safety. My engine is a 130 hp
Ram
> Performance modified Soob EA81 NA. This was also a first flight after
> installing the Europa speed fairing kit. Climb rate was mostly 800 fpm,
> sometimes 1000. I wanted to see if the speed fairings had helped any and
> did a one way speed run at 7500 ft straight and level at 170 mph GPS.
There
> was no bumps and no wind. I had
> done a solo speed run 2 weeks prior and had shown a similiar 170 mph with
no
> speed kit. I'm
> not sure the speed fairing kit is adding any extra speed but need to do
some
> solo tests.
> My buddy flies a O-360 powered Lancair and was not used to the high
engine
> rpm of a geared engine and preferred to slow down to 4000 rpm to closer
> approximate the 2700 rpm or so of
> his engine. We noticed the Matronics fuel flow meter keep dropping and
> dropping at 4000 rpm, settling on 2.6 gph. We flew a big 10 mile circle
> around the airport to offset any wind, and
> GPS speeds averaged right at 110 mph. Then we tried a circle at 3500 rpm.
> This worked out
> to 95 mph. Fuel burn was down to 2.1! This works out to 45 mpg!
> Fuel burn basically doubles from 4000 rpm to 5000 rpm. This is very
handy
> information to know if you have to stretch that tank! The Europa is an
> amazingly efficient little plane!
>
> Glenn Crowder
> Golden, Colorado
USA
>
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