WHEN TO USE OTHER NEEDLE SETTING ON CARB

by FEDERICO COMPEAN in 912 / 914 Technical Questions 7 years ago

Hi,

I have looked and asked around and have yet to find a person that tells me they run their needles on a different setting than the middle one (third position) on their carburators.

I am flying mostly (80%) out of a filed at 6,000ft elevation. Of course I will visit the beaches and lower elevation areas, but the base airport is at 6,000.

Would this merit using any other setting rather than the third?
What can I expect if I change the setting to a leaner one? More power? Hotter temps?

Thanks

Fredy

Re: WHEN TO USE OTHER NEEDLE SETTING ON CARB

by Roger Lee » 7 years ago

Roger Lee

128 5.28k 4.98k

Hi Fredy,

If you flew out of that 6K ft. airport and stayed above that all the time then going to the #2 position wouldn't be an issue. I would be vigilant about doing so going down to sea level especially on a cold morning. If just the right conditions arose you could be on the lean side. Prop pitch will play a big factor in sea level vs high altitude flying.

p.s.
You could just leave it on the #3 clip position and it will still run fine to your higher altitudes.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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WHEN TO USE OTHER NEEDLE SETTING ON CARB

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