From: "Andrew Martin" <flyrotary@lancaironline.net>
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Date: Sun, 7 Aug 2016 22:04:44 +0800
Message-ID: <CAJxaVD3GcmikAtGn8O6Ht99EuZ32A+MdxmVmf6ukXDw8OSnFzg@mail.gmail.com>
Subject: Re: [FlyRotary] Tuning
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Had some success this weekend, for once things seemed to fall into place.
Seems I don't always know what I don't know, I thought I had a good tune
but in reality not good enough as my attempts at flight have not given
confidence to continue so have been landing asap. I'm pretty sure it was
running very rich to the point of nearly flooding. Some things are
ingrained from past years, leaning on climb is not one of them, better to
land and figure it out.

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


-- 
Regards
Andrew Martin
Martin Ag

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Had some success this weekend, for once things seemed to fall into place. S=
eems I don&#39;t always know=C2=A0what I don&#39;t know, I thought=C2=A0I h=
ad a good tune but in reality=C2=A0not good enough as my attempts at flight=
 have not given confidence to continue so have been landing asap. I&#39;m p=
retty sure it was running very rich to the point of nearly flooding. Some t=
hings are ingrained from past years, leaning on climb=C2=A0is not one of th=
em,=C2=A0better to land and figure it out.<div><br></div><div>So on=C2=A0Fr=
iday decided to put EC2=C2=A0back to defaults and start fresh. Best decisio=
n I made so far=C2=A0and I reckon it should be suggested to do more often a=
s Tracy&#39;s defaults are just about spot on, managed to bugger it up thou=
gh, no worries,=C2=A0its all learning.</div><div><br></div><div>Some=C2=A0n=
oise had=C2=A0been noted=C2=A0by locals at the airport on a number of occas=
ions, to=C2=A0try and keep them happy=C2=A0on Saturday I quickly knocked up=
 a silencer and shoved it in the end of the exhaust. Yeah,=C2=A0its quieter=
, but bugger me, the egt&#39;s now match and the O2 sensor is way more stab=
le. I think the O2 sensor maybe=C2=A0was not getting hot enough and/or gett=
ing oxygen in from the end of the exhaust giving a lean indication,=C2=A0as=
 such I had been=C2=A0tuning way too rich. The black in the exhaust should =
have alerted me to this, but no.<br></div><div>The egt&#39;s matching is=C2=
=A0I guess=C2=A0due to a bit of back pressure in the exhaust, don&#39;t car=
e really,=C2=A0as its fixed without invoking mode 4.</div><div><br></div><d=
iv>Night time reading usually consists of a search of the Flyrotary archive=
s to catch up on some of=C2=A0what I&#39;ve=C2=A0missed. Its a bit of a luc=
ky dip but last night brought up a gem, #50149 , Feb 2010 ,Tracy in reply t=
o Bill B giving the then current instructions in the manual ( my manual is=
=C2=A02 years prior at=C2=A0Dec 07),=C2=A0so first thing this morning, prin=
t it and off to the airport. Reset everything, set prop mid pitch,=C2=A0fol=
low instructions. This is the best tune so far, smooth from idle to full no=
ise. So now I know a little more.</div><div>Will give it another hour or so=
 at all throttle &amp; prop settings then try another flight this week,=C2=
=A0after=C2=A0helping=C2=A0put a new PT6 turbine=C2=A0&amp; prop in the Thr=
ush,=C2=A0Pilot collected=C2=A0a powerline on a spray run.</div><div><br></=
div><div>Andrew</div><br><br>-- <br>Regards<br>Andrew Martin<br>Martin Ag<b=
r>

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