Bonanza Level Off and Lean Technique in Cruise

FlyWire takes a look at Engine Management in Level off and Two Techniques for Leaning the engine. I must admit I like LOP, if you fly Rich of Peak, please do it with fuel flows at least 100 degrees Rich of Peak!

FlyWire is about exploring flight and the freedom this incredible experience brings us on a personal level. Flying has always captured the imagination and excitement of living life to its fullest. Hi, I'm Scott Perdue. In a former life I flew the F-4 and F-15E, more recently I retired from a major airline. I've written for several aviation magazines over the years, was a consultant for RAND, the USAF, Navy, NASA as well as few others, wrote a military thriller- 'Pale Moon Rising' (still on Kindle). But mostly I like flying, or teaching flying. Some of the most fun I had was with Tom Gresham on a TV show called 'Wings to Adventure". We flew lots of different airplanes all over the country. Now with FlyWire I want to showcase the fun in flying, share the joy and freedom of flight and explore the world with you. Make sure you subscribe if you want to go along for the ride!

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[pg]

Hi Scott, I'm a new member. Love it. On this particular video you speak way faster than I can hear. : )

[ParrtheCourse]

Thanks that is pretty much what I do in a Cessna 182, I’ve got a few full throttle fuel flow settings for my typical cruise altitudes and just adjust fuel flow accordingly. I double check with 50 degrees rich of peak to confirm every once in a while and it’s dang near spot in each time. Thanks for sharing!!

[mmulder]

Another fantastic video and short and sweet on leaning the engine! Thanks for sharing and as always these videos are top notch on content and quality. Thank you Scott!!

[donc]

Scott, I've enjoyed every video of yours that I've seen and love learning about aircraft, flying, working on or maintaining them, even though I'm not a pilot (maybe when I grow up, or better still my bank account grows up!) but I'm learning a lot from you and working my way through all your videos! Thanks for your dedication and work to improve the safety and experience of general aviation!
Edited to add: When you flew with Frank I watched your eyes with all his actions and reactions and what I saw tells me you didn't miss a thing!! You maybe didn't say anything but you noticed everything I believe!
You would be great to have as an instructor!!

[markg]

Very useful video. Thanks. Impressive #s esp your low CHTs.

[ronaldweiner]

Just to clarify, the method Scott used was the JPI lean find RICH OF PEAK. That method finds the first cylinder to go over peak, and generally

[ronhunt]

Ok - I'm confused, you are setting your mixture based on finding ROP on your JPI to determine your 14.6 FF. However, in the description above your state if you fly ROP that you should do it with fuel flows at least 100 degrees ROP, but you never set 100 degrees ROP. Instead you are setting the fuel flow that gave you the peek EGT and you are basically leaving it there. EGT may just be an instrument, as you state, but it is the instrument by which you determine your ROP EGT in order to set 100 degrees ROP or run LOP if you choose to do so.
I apologize if I am misunderstanding what you are saying. I've owned a V-35 with an IO520 for several years, My engine generally peeks nearly identical to yours at 1480 EGT give or take, however, I don't fly at peek, I normally fly at 100 ROP. 15.5 will always put me in the ball park for 100 degrees ROP at 65% power. I also have GAMI's and D- Shannon baffles and my CHT's at that setting will run in the 325 - 345 range depending on my load and the OAT with EGT's in the 1380 range.

[neatstuff]

What about leaning for takeoff at high altitude Scott? I don't remember ever being taught or teaching much about that as I flew mostly out of a sea-level airport. But I found out later that I had been doing it wrong and at higher altitude like Aspen for instance you want all the power you can get.

[mannypuerta]

I do the same in the 185 with GAMI’s installed. WOTLOPSOP all the time.

Just installed a GAD-13 for the G5’s, so I now have TAS, OAT and wind. Great feature.

[kjackles]

New sub here Scott! I am enjoying your channel. I assume that you know your engine quite well. Sorry to be contrary but… for those who are still learning or operating a new to them engine, this method is sub optimal. If one wants to set power by fuel flow(ff) it is prudent to verify LOP EGT on richest cylinder and/or ROP EGT on leanest cylinder and note those FF numbers. Unless I missed something, you were using ROP "lean find" (which is leanest cyl) to verify peak EGT. That tells you nothing about settings of the richer cylinders. They may or may not be at a desirable power setting. Many stock injected engines run poorly as the richest cylinder approaches peak EGT. This would go undiscovered using peak EGT on the richest cyl . The method depicted is fine if one knows they have conforming F/A ratios across all cylinders. While one can use CHT as a proxy for mixture setting it is heavily influenced by DA and OAT (Cruise CHTs in August should differ from Feb). Also, CHT is a slow and imprecise proxy for combustion event/mixture analysis. CHT can take minutes to reveal what EGT will show in seconds.

[apfelsnutz]

Nice video, straight ahead leaning... but just a tad to rich for me. Do you have GAMI s ?

[Htiek]

Thanks Scott-

What engine is in this ?

[georgewoodland]

At 14.6 gpa are you rich or lean of peak? If so how much below peak or above peak?

[ryanaquino]

Is it normal to see CHTs that low? I’m guessing you have an Io-550 with d Shannon baffles. Were the cowl flaps open?

[gwndds]

Scott, does your leaning procedure show much difference in fuel flow depending on altitude you are flying?

[dirtcurt]

So has "lean of peak" come home to roost with the latest service letter from Continental? Time will tell.

[RR-klsl]

Would help to know which airplane & engine you're flying here exactly ;)

[mynickels]

My first big pull: "too big, too big"!!!!

[deani]

I get the thrust of this, but the explanation is confusing (ie: you are seeking LOP but set the JPI for ROP)

[joeyg]

the fuel flow method is the wrong way because it is subject to temp and density altitude…