Anthony,
Thank you so much for the notes. Very helpful. Sorry for the late reply.
See below
John,
I like your logic up to a point…
The 50°F LOP… is one of those things….
1) If you fly at 10k’…. You are well above the red fin territory in you NA Mooney…
Understood.
2) Adding LOP to that… is similar to pulling the throttle back…. Why would you want to do that?
Agreed
3) I tend to use Altitude as a few more minutes of safety drive… in the event of an off airport experience…
So do I.
4) a few degrees LOP… allows maximum power available, outside the red fin territory, and no other CHT issues…
Seems logical. I shouldn't get hung up on 50 LOP when it no longer applies.
5) If you are pulling back on the throttle, going that deep LOP, saving the engine…. Or flying around at low altitudes… that may make sense…
OK
6) Having a discussion with Bob Minnis would be great!
I may track him down but enough experts who know his writings here on-line it seems.
7) Often around here… you will see MSers climb at FT, lean using the G1000’s white box, climb to altitude…. Cruise at WOT, leaned to peak so all cylinders are slightly LOP, and do an inflight mag test somewhere in the middle of the flight… with 2700rpm available… 2550 is a great option to have… (2700 is great for getting off the ground and clearing trees…. And E-descents….)
That's what I'm doing now though at 2500 RPM
8) The advantage of all cylinders being Lop… all the lead is being burned, no excess fuel being used for cooling… when it is not required…
Yes
9) Going any more LOP at altitude has skipped any extra value that it gets at lower altitudes…
Makes Sense
10) The IO550 Mooneys have very nice instrumentation and sensor locations when it comes to reading/using EGT data… there is a very precise Ship’s EGT gauge location… we actually have 7 EGT instruments… not just six…
Didn't know that.
11) Raw EGT data actually means something when using this gauge…
I agree more precise. As you know M. Busch could care less about EGT. He doesn't even look at it. Just one opinion but his argument is compelling.
It's all about ICP's (CHT is our only view of that with the current instrumentation)
12) Of course… somebody goofed up the tag name on the G1000 for Ovations… does yours say TIT on the G1000?
I think mine says EGT.
13) Most Ovations don’t have a turbine to measure an inlet temperature…. it’s a relic of the Mooney/Garmin team’s inability to work together all of the time…
Old stuff.
14) along with the power chart from the 310hp STC…. Look up the MAPA key numbers method for simple math in your head kind of way of adjusting MP, and RPM to get %power you want…. That’s an easy way compared to memorizing two power charts…
Great. I'll look that up or call MAPA. I'm all for easy math.
15) Let’s talk max FF… what is your’s set at during T/O at Sea Level? Many IO550s in the field are set too lean for good CHT control… from Missiles to O3… 25, 27, 28, 29, or 30 gph?
I'm 29.1-29.7 depending on conditions. Runs great.
Go IO550!
PP thoughts only, not a mechanic…
Best regards,
-a-