May 17, 2013
Question: What is a stoichiometric mixture?
Answer: A stoichiometric mixture is the ratio of air to fuel which, when combusted, results in all elements of the mixture being used without any elements left over. Combustible mixtures range from an air-to-fuel ratio of about 8:1 to 18:1. However, a stoichiometric mixture has a ratio of 15:1. While this mixture will result in the fewest combustion byproducts, it may not be advisable to operate your engine at the stoichiometric ratio. Such a mixture may result in the peak exhaust gas temperature. Refer to your pilot's operating handbook for specific guidance on setting your aircraft's mixture. For more on leaning technique, see this article from Flight Training magazine.
After a complete electrical failure during an initial climb from the departure airport, the pilot of a Beech King Air 200 learned a valuable lesson from a simple but costly omission.
Time is running out for potential tailwheel pilots to bid on a package of tailwheel training at Lakeland, Florida-based Tailwheels Etc.—including two hours in a 1940 Stearman Kaydet biplane—in this year’s AOPA Foundation online auction.
Many student pilots are nervous come checkride day. When you’re a top official at the agency responsible for the safe operation of the largest airspace system in the world, it can add to the pressure.
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