Dennis,
Are you climbing with
WOT or do you throttle back to 24 inches? I am at 55 feet here so my NA
take off with ram effect can get to around 30.5. I usually fly with WOT
and control the engine power (and cooling) with the MT prop. I dial it
back to around 6K for climb after I reach a safe
altitude.
Your EGTs are similar
to mine, maybe a little lower. My exhaust would not be considered
quiet. I had a Hushpower II on it but became concerned that I might get
an exhaust stoppage, so I just recently removed it an installed a 4” dia DNA
muffler. The sound is very similar. Maybe a little louder, but I
don’t know for sure. I tried to get a loudness record before I changed
the muffler, but the decibel meter I was using only went to 105 DB and that
was not even close to what the level was.
:>(
I originally had a
Performance prop on the plane with your same dimensions (76 X 88), but I could
not get more than 5350 static rpm with it. I was afraid I would not be
able to get airborne with no more HP than that, so when the opportunity to get
the MT prop at a “bargain” popped up, I jumped on
it!
When you say you go
lean of peak, what does it peak at? How many degrees lower do you
go? 20 inches would mean you are at about 8500 ft with WOT? What
does your rpm run at under those conditions? I assume leaning drops your
rpm? From what rpm to what rpm?
I am trying to get
some understanding on the “how to” for leaning the rotary. I hope you
and others as well chime in with their thoughts as well. I know
Tracy has
economical running down to a science!
:>)
Bill
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Dennis Havarlah
Sent: Tuesday, May 15, 2012 10:47
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Thanks Tracy!
I see EGTs around 1720 -1740
during takeoff and initial climb. During climb at about 24 in hg I see
EGTs 1700 or below. In cruise I go lean of peak and at about 20 in hg I
my EGTs are 1550 - 1630. My exhaust is very quiet. This may cause
my EGTs to be high. I've got approx. 350 flight hours on the RV-7A with
the Renesis and 2.85:1 RD1C. Prop is Catto 88 in pitch and 76 in
dia.