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Posted

The POH does have tables, but who wants to have those printed out? They used to be silkscreened on the visor, but either those have been long replaced by a Rosen or are unreadable. And what's more, if you have a 4-cylinder engine monitor installed, then you can use that as your guide. With that in mind, here are my rules of thumb.


Cruise Flight:


<5500 Feet: 2400RPM/24", 20 LOP (or thereabouts, to keep CHTs <350)


>5500 Feet: 2500RPM/WOT, 20 LOP (or thereabouts, to keep CHTs <350)


Instrument approach: 2400RPM/20", in level flight this puts me at gear extension speed, then reduce manifold to 17" or thereabouts on decent with 10° flaps.  Same basic settings for VFR in the pattern.


Beyond these basic settings, I'm just futzing around to try stuff or deal with special situations.

Posted

Quote: Jeff_S

Instrument approach: 2400RPM/20", in level flight this puts me at gear extension speed, then reduce manifold to 17" or thereabouts on decent with 10° flaps.  

Posted

In level flight, 2400/20 gets me to below landing gear speed. So I'll drop gear before glideslope intercept (or FAF) which generally gets me to flap speed. I may futz just a touch to get to flap speed, so on descent I can drop 10° flap, reduce MP to 17" and glide right on in. Mind you, it doesn't work perfectly every time, but that's always my initial target.


It's great fun to fly a fully-coupled approach and just play with power to nail the airspeed I want, then let the A/P do the rest.

  • 2 weeks later...
Posted

Quote: WardHolbrook

I saw an iPod app that some guy put together that had the power settings for the IO-360.

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