Cessna 152 (proper) air/fuel ratio...

[dtvonly]

Hi. I am a student pilot and have always done "proper" leaning per flight altitude. I should have asked this a long time ago but...anyway...when using the mixture control to get "optimum" RPM at altitude, what is the "optimum" air/fuel ratio ? 3:1, 4:1, etc...

Thank you.

[Panic[_4_]]

"dtvonly" wrote in message ...


Hi. I am a student pilot and have always done "proper" leaning per
flight altitude. I should have asked this a long time ago
but...anyway...when using the mixture control to get "optimum" RPM at
altitude, what is the "optimum" air/fuel ratio ? 3:1, 4:1, etc...
Thank you.
dtvonly

Unless you have a device that reads out your air/fuel ratio you should
probably just use the old method. At cruise altitude with power/speed
stable, just lean out the mixture control until the engine runs a little
rough and then push it back in about an inch.

[RST Engineering[_2_]]

Varies with the engine, with the fuel atomizaion scheme, displacement,
etc, but most of us live with a 15:1 air fuel ratio as a starting
point.

Jim




On Mon, 14 May 2012 23:58:14 +0000, dtvonly
> wrote:

>
>Hi. I am a student pilot and have always done "proper" leaning per
>flight altitude. I should have asked this a long time ago
>but...anyway...when using the mixture control to get "optimum" RPM at
>altitude, what is the "optimum" air/fuel ratio ? 3:1, 4:1, etc...
>
>Thank you.

[Bug Dout]

RST Engineering > writes:

> Varies with the engine, with the fuel atomizaion scheme, displacement,
> etc, but most of us live with a 15:1 air fuel ratio as a starting
> point.
>
> Jim

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