This week instead of driving three hours through crap traffic, 181 got hauled
out
and taken into the sky to do the journey in just 75 minutes; without traffic
or idiot drivers to deal with.
The journey back was exciting; turning east on departure to cross the bay at
132kt
gs, ASI read 80!!!
Then had "washing machine" to contend with, midday thermal activity, mechanical
turbulence off mountain ranges to the west, 2500' CTA ceiling, 1700' undulating
terrain floor, -500fpm sink, 30C air temperature.... It was 15 minutes of "not
fun"... then headed straight back to happy air at the coast once over the
ranges and clear of CTA... Pulled up weathX at the field; robot said 90deg xwind
gusting 15kt; interesting... got to the field and wind sock said 25kt sea breeze
straight down 05; brought 181 in and had a relaxing cup of tea... All the
practical training got used...
Today confirmed 50 years of engine tuning skills with the new FART box (Fuel Air
Ratio Tester).. What did it reveal??? It said that after 50 years of tuning
engines by ear and sense of vibration the skills are still functioning
perfectly!
The FART confirmed idle mixtures were set spot on at 14.5 Stoichiometric...
FART also confirmed main jets were set spot on at 14.5 also... What else did
FART reveal?? FART revealed that adjusting the idle mixtures on the Bing
carburettor
only has affect at 1500rpm and below... FART also revealed that altering
the main jet only has affect from 3600rpm upwards... What does this all mean??
It means basically all useful work the 912 does is on the main jet only!!
181 never flies at rpm below 3600; final is flown at 3600 with power pulled back
to idle just before round out... between 3600 and 1500 the intermediate needle
mixture is on the rich side of 13 down to 11; but this is all ground taxi
rpm... What else was confirmed by today's first ever FART experience?? It
confirmed
fuel injection on the 912 is not required.
What else was learned today? That a good FART box can let anybody FART
anywhere!!!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508928#508928
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