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Welcome to the enquiries forum. this is the place to ask questions relating to our books, our courses or the school. If you have a more specific problem relating to aviation theory, check out the Question and Answer forums. That's the best place to post your technical questions.
Ngailingkei created the topic: Question regarding maximum range
Hi just want to confirm that in level flight,
Maximum Lift/drag ratio speed (around 4 degree AoA) = Minimum total drag speed = Minimum thrust speed = Speed for best miles per gallon = Best glide speed = Maximum Still air Range.
bobtait replied the topic: Question regarding maximum range
In level flight the amount of lift required is not negotiable - It must be equal to weight. It follows that if lift is fixed, the lift/drag ratio must be at a maximum when drag is at a minimum. When drag is at a minimum, the thrust required is also at a minimum since thrust must equal drag in straight and level flight. For conventional aerofoils, wind tunnel tests show that drag is at a minimum at one particular angle of attack (about 4° for most conventional aerofoils).
