Dico,

 

Why do you think they call it “the big pull”? If you do a gradual/slow pull of the mixture control your engine will be in

 the area of peak internal pressure/temperature for some time before they start to drop. Also the turbine inlet temperature can go very high.

 

I pull my mixture out; no half a turn a second. If I pull a little too far, no big deal, now I can do the fine tuning of the mixture control.

 

I would suggest you take the GAMI course.

 

Lynn Farnsworth

Super Legacy

TSIO-550 Powered

 

 

 

Hi All,

I am new to LOP operations and am looking for some help.  I spoke with some IV-P owners in oshkosh about this and just wanted to get some more info and clarification.

I understand that i should run ROP until altitude, then i can run LOP. The CHTs are supposed to be 390 or less and the TIT 1650 or less. So since i have not made the "big pull" before, i would like to know how exactly is the best way.  Do i set the cruise power, say 30" and 2500rpm, then slowly turn out the mixture... Watch the temps rise ( how hot does it get before it starts to go down again?) and then keep leaning until i get the TIT back to 1650 and CHT to 380ish or below?  How fast should the leaning happen? I understand i dont want to get the chts and tits really hot, so i presume i should be leaning relatively quickly (half a mixture turn per second?)

Has someone ever made a little video with their point and shoot camera of this process while up in the air?  This would be handy for someone new to running LOP.

Thanks all,

Dico

--
Regards,

Dico Reijers

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