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1. 10:04 PM - Lean side of peak running (H PAINE)
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| Subject: | Lean side of peak running |
--> Rocket-List message posted by: H PAINE <bluebird266@dslextreme.com>
After about two months of intermittent test I finally archived the desired
results. Working with Don Rivera at Airflow Performance and changing the
injector nozzles to the size that evened out the cylinders Egt peak within
.2 GPH. He would make recommendations based upon fuel flow and EGT data
that I gave to him about five different times.
Here are the results
at 21.5"MP and 22OO RPM at 8500 to 10500 between 8.5 GPH and 10 GPH that
good but for you rocket drivers with High CHT on these summer days listen
to this!!
Took off form Lamar Col on the hottest day in recorded history for that
area AWOS said 104F at 3700 ft
OAT digital thermometer said 117 degrees or 45C for you metric folks was
surprised to get bluebird started after heat soaking for 1/2 hour but to
date I have not failed to hot start on first try for two years now and that
my friends was the ultimate test! Took off fully loaded and did slow 1000
fpm climb to 7500 ft before CHT hit 430 oil 220 leveled off and stablelized
settings to 21.5 "MP and 2200 RPM then proceeded to Go to lean of peak
about 50 F and watched the CHT's drop to 370 F and oil down to 180
as Vince would say Wahoo!!! First time bluebird has run so cool or yeah it
was still indicating 99F oat
at 7500. After that I just maintained that MP pressure as long as possible
slowly step climbing to
15500 and sucking on the nose tube. Yes TAS is slower but not by much about
170Kts.
More on my Hot start procedure later
Harry Paine
266HP 360 hrs
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