N177MC Posted October 1, 2014 Report Posted October 1, 2014 Around 1995 or 96 I read an article in the MAPA magazine where an early Mooney driver explained how he ran his G or F model very lean, what we now call LOP. This was BEFORE GAMI started hawking "balanced injectors" ! I'd really like to get my hands on that article if anyone out there can copy it or direct me to it I would be very appreciative. Thanks !
Danb Posted October 1, 2014 Report Posted October 1, 2014 Try contacting Trey at the MAPA office, he may have all the mag's on file...
N201MKTurbo Posted October 1, 2014 Report Posted October 1, 2014 There is a four foot stack of MAPA log magazines in the corner of my office, I'll look through it one of these days. You are welcome to come over and look through them if you want.
carusoam Posted October 1, 2014 Report Posted October 1, 2014 It would be really interesting if it was a G. Fs are run LOP every day with great reliability. Carbureted O360s don't have much documented history of running LOP through a wide range of power output. Best regards, -a-
Tony__L Posted October 4, 2014 Report Posted October 4, 2014 I have watched a couple of Mike Busch's webinar's on mixture control and leaning to LOP this week. I went out yesterday and spent around 2 hrs trying all manor of mixture settings, all at 4000ft. I found a substantial saving in consumption, around 20% per hour and around a 6% loss in speed. At the same time all my CHT's were around 30 to 40 degrees cooler (not that they needed to be cooler, my engine runs quite cool already). What I did find was that it took longer to set the mixture and for the EGT's to stabilize at LOP. Perhaps it is a practice thing. Was an interesting exercise and I will definitely be running LOP in the cruise in future. I am going to continue to research this though as it is a very interesting field of GA. BTW; flying a M20F Exec 21 with 3 blade prop. PS: what speeds do you guys with the same setup as me get out of your planes and with what configuration is that? (Sorry for the hijack)
N601RX Posted October 4, 2014 Report Posted October 4, 2014 Once you determine your favorite LOP setting take note of your fuel flow. Next time you can just pull mixture to the same flow much quicker. No need to locate the peak each time. 1
N177MC Posted November 18, 2014 Author Report Posted November 18, 2014 If I remember correctly, the author of the article hada F model. Based on that article, I have operated my Lycoming IO-360s ( Cardinal RG & Mooney 201) almost EXCLUSIVLY LOP since 1996 ! Mind you, I'm based Europe, so the gas savings motive is about X2 compared to the US . I'm surprised that so many still question LOP after all these years ...
Yetti Posted November 18, 2014 Report Posted November 18, 2014 I was looking this up last night. How to run LOP without fancy monitor. There were several Beech articles. The parameters seemed to be. Above 8000 feet you can't hurt the engine doing it wrong. pull the mixture till you feel the plane slow up. Should be about a 10 mph/knots drop in airspeed. Engine should smooth out. http://www.ballyshannon.com/baroneduc2.html
Yetti Posted November 18, 2014 Report Posted November 18, 2014 How to get maximum cruise out of a B29 bomber starts on page 42 http://babel.hathitrust.org/cgi/pt?id=mdp.39015003724971;view=2up;seq=48 They had an auto rich feature.
Yetti Posted November 18, 2014 Report Posted November 18, 2014 For leaning, GAMI recommends what it calls the "big mixture pull." Rather than fuss with worrying the mixture out a tenth of a gallon at a time in search of peak EGT/TIT, Braly merely draws the mixture back in one deliberate, smooth pull until the airplane noticeably decelerates. http://www.avweb.com/news/reviews/182501-1.html?redirected=1
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