Sorry to hear about the prop Steve but glad the engine was working
well. You are obviously as meticulous about building the plane as you
were in your investigation into the injector mystery; beautiful job. Hope
you get many hours of pleasure flying it. It does sound like you are over
proped or engine is "under tuned". What are the numbers on that
prop?
Tracy
----- Original Message -----
Sent: Monday, April 30, 2007 5:01
PM
Subject: [FlyRotary] trimmed prop
On Wednesday of last week I made my first XC flight with my 13B
powered
RV6A. The flight was from Laramie, WY, to Benson, MN, with a
distance
covered of 507 nm. It took 4hr 15 min non stop using 30.4
gal of fuel
leaving 7.6 gal reserve. We started at an initial gross
wt of 1796 lb and
cg of 73.2 in. That was my first excursion to density
altitudes less than
7000 ft. It was really fun to see climb rates
over 1000 fpm with 1700 lb
gross wt at 3200 ft density altitude and to feel
the increased acceleration
on take off. Static rpm at 3200 ft density
altitude was 4870 with 27 in MAP
and showing 11.1 gal/hr fuel consumption
rate. That makes me think I could
use a prop with less pitch.
My extrapolation of the mixture table for the
EC2 with the snubbers
installed worked very well with the higher manifold
pressures that had not
been tried previously with my setup. That was good
news.
The
bad news is what happens when I forget to remove the tow bar and feed it
to
the propeller (see attached photo). No injuries or other damage
occurred
as far as has been determined at this point. The 12 hour
drive back home
yesterday gave me plenty of time to reflect on my
stupidity. I concluded
that my "experiment" was probably not the best
way to investigate the effect
of a smaller prop. Needless to say, if
someone has upgraded to the 2.85
drive and has a prop for a 2.17 drive for
sale, I would be interested to
know about
that.
Sheepishly,
Steve Boese