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#4620017 - 02/05/23 08:36 PM Mixture control after startup/during landing  
Joined: Jan 2013
Posts: 11
osterizer8 Offline
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osterizer8  Offline
Junior Member

Joined: Jan 2013
Posts: 11
I'm pretty new to manual mixture control, so forgive me if this is a rather dumb question.

I've noticed that at low altitude, having a rich mixture and an idling engine causes the engine to sputter, sounding similar to when the engines start to fail after a mechanical fault. This does not appear to occur above around 500-800 feet ASL. Is this damaging the engine?

Should I be leaning the mixture out at low altitude? I was under the impression that it's more common to lean it out at higher altitudes to keep the RPM up, but the engine certainly sounds displeased!

#4620025 - 02/05/23 10:01 PM Re: Mixture control after startup/during landing [Re: osterizer8]  
Joined: May 2012
Posts: 1,133
77_Scout Offline
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77_Scout  Offline
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Posts: 1,133
Vancouver Island, Canada
At low altitudes I always have the mixture fully rich, and as you said above I just lean it to get better revs at higher altitudes. I don't believe the engine will be damaged. Others will hopefully chime in with more thoughts.

#4620029 - 02/05/23 10:43 PM Re: Mixture control after startup/during landing [Re: osterizer8]  
Joined: Mar 2011
Posts: 938
VonS Offline
WWI Flight Sims on a Mac
VonS  Offline
WWI Flight Sims on a Mac
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Posts: 938
@OP, might try leaning to about 85-90% even at ground level, if you find that it minimizes occasional belching from rotaries at idle throttle. An alternate solution is to keep the throttle at least at 30-40% on rotaries, while on the ground, and mixture at full rich -- but use the blip switch at such a setting (more historical that way too since most rotaries would conk out below about 40% or so throttle). For inline engines, if you experience the same problem while on the ground, again either lean mixture to about 85-90%, or, more simply, keep throttle at no less than about 10% on the in-lines.

Cheers & happy mixture/throttle tweaking,
smile2


~ For my various FM/AI/FPS/DM Mods. for First Eagles 2, WoFF, RoF & WoTR, and tips for FlightGear, recommended is to check over my CombatAce profile (https://combatace.com/profile/86760-vons/) and to click on the "About Me" tab while there. ~
#4620036 - 02/06/23 12:28 AM Re: Mixture control after startup/during landing [Re: VonS]  
Joined: Jan 2013
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osterizer8 Offline
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osterizer8  Offline
Junior Member

Joined: Jan 2013
Posts: 11
For some reason, inline engines still splutter for me even if I lean the mixture at low altitude, but I have found about 15-20% throttle seems to get it to stop while often not quite being enough to start moving the aircraft. Thanks for your help!


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