So on Friday decided to put EC2 back to defaults and start fresh. Best decision I made so far and I reckon it should be suggested to do more often as Tracy's defaults are just about spot on, managed to bugger it up though, no worries, its all learning.

Some noise had been noted by locals at the airport on a number of occasions, to try and keep them happy on Saturday I quickly knocked up a silencer and shoved it in the end of the exhaust. Yeah, its quieter, but bugger me, the egt's now match and the O2 sensor is way more stable. I think the O2 sensor maybe was not getting hot enough and/or getting oxygen in from the end of the exhaust giving a lean indication, as such I had been tuning way too rich. The black in the exhaust should have alerted me to this, but no.

The egt's matching is I guess due to a bit of back pressure in the exhaust, don't care really, as its fixed without invoking mode 4.

Night time reading usually consists of a search of the Flyrotary archives to catch up on some of what I've missed. Its a bit of a lucky dip but last night brought up a gem, #50149 , Feb 2010 ,Tracy in reply to Bill B giving the then current instructions in the manual ( my manual is 2 years prior at Dec 07), so first thing this morning, print it and off to the airport. Reset everything, set prop mid pitch, follow instructions. This is the best tune so far, smooth from idle to full noise. So now I know a little more.

Will give it another hour or so at all throttle & prop settings then try another flight this week, after helping put a new PT6 turbine & prop in the Thrush, Pilot collected a powerline on a spray run.

Andrew