Simviation Forum - Throttle Mixture Tutorial

Reply #30 - Oct 15^th, 2009 at 1:36pm

SeanTK Ex Member

Cowl flaps: In my experience....

Fully open = on the ground, climbing, final approach.

Varying degrees of closure/fully closed = cruise flight, descent until lined up on final.

Mixture: you can fiddle with the CHT needles to accomplish a specific temperature goal, or just lean it until the engine roughens/slows then bump it up a tad.
Didn't read through to see if it is mentioned, but it is a good idea to lean the mixture when taxiing/operating on ground at low power settings so you don't allow an excessive carbon buildup to foul the plugs.(Keeping the rpms at at least 1000 also contributes to this practice) Just remember to go full rich for takeoff, keep it full until around 3000 ft (unless your field is at high altitude), and then full rich when landing.

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Reply #31 - Oct 15^th, 2009 at 1:44pm

Brett_Henderson Offline
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Quote:

Mixture: you can fiddle with the CHT needles to accomplish a specific temperature

I think you mean EGT. CHT lags far too much for mixture reference.

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Reply #32 - Oct 15^th, 2009 at 2:01pm

SeanTK Ex Member

Yeah.

The brain wasn't fully functional when I wrote that.

"Let's see...a three letter acronym that is near the engine gauges.....this one sounds good."
Wink

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Reply #33 - Oct 15^th, 2009 at 8:59pm

olderndirt Offline
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Very good thread. A thing I was taught, a long time ago. Lean for max turns on one mag - when you switch back to both, it'll be just right

. Any takeoff above 1000', try the mixture to see if anything good happens.

THIS IS NOT A PANAM CLIPPER

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Reply #34 - Oct 18^th, 2009 at 3:55pm

Augr Offline
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Most FSX aircraft that have cowl flaps don't actually do anything with them. Sure, there's a knob, but it doesn't do anything. Brett's C310 is one of the one's that does model them. If you leave them closed on the ground it gets downright hot under the cowlings.

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Reply #35 - Nov 23^rd, 2009 at 7:29pm

DenisH Offline
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I'm constantly reminded that my engine (s) are losing power because of mixture. My Q is: How does one know when the mix is lean enough? I've noticed that if you press "Cntrl-D" the mixture control slides all the way to lean regardless of the altitude. (I think it's contrl D but I forget at the moment what buttons you click).

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Reply #36 - Nov 24^th, 2009 at 5:16am

Fozzer Offline
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DenisH wrote on Nov 23^rd, 2009 at 7:29pm:

I'm constantly reminded that my engine (s) are losing power because of mixture. My Q is: How does one know when the mix is lean enough? I've noticed that if you press "Cntrl-D" the mixture control slides all the way to lean regardless of the altitude. (I think it's contrl D but I forget at the moment what buttons you click).

Lean the Mixture very gradually...(Grab hold of the Mix Knob with the Mouse)....listen to the engine revs...watch the tacho'...be careful...or the engine will stop!

As soon as the engine starts to cough, splutter, and run rough, slightly richen the Mixture until it runs smooth again.
That will deliver the most power to the Engine.

On most Piston Props the Mixture must be wakened when above 5,000 Feet ASL for efficient running.

If taking off from an Airfield located above 5,000 Feet ASL the Mix must be weakened as above, to ensure a full-power take-off... Wink

...!

Note: Don't forget to apply Full Rich when descending below 5,000 Feet ASL, and/or landing, to regain power, and to keep the engine cool with liquid fuel, and prevent overheating. (Engines run hot on a weak Mixture!)

Paul...G-BPLF...FS 2004....and a Bike with four Carburettors!... Grin

...!

Mixture:
Road vehicles require a rich Mix for starting and a weak Mix for running.
Air-Cooled Aero Engines require a Rich Mix to develop full power for running at low levels, and also to prevent overheating....(the Liquid Fuel helps to cool the engine).

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