Questions tagged [theory]

Questions about the theoretical aspects of aviation.

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6
votes
1answer
563 views

Is there an equation which allow us to perfectly match a helix propeller and an engine?

Is there an equation which allow us to perfectly match a helix propeller and an engine? I'm looking for an equation that allow me to correctly dimension an helix propeller for my engine. I mean that ...
6
votes
2answers
4k views

Is the maximum lift-drag ratio found at minimum drag?

Figure 10-5 of the FAA's Pilot's Handbook of Aeronautical Knowledge shows: I didn't think $L/D_{MAX}$ coincided with $D_{MIN}$. Is this Figure accurate?
10
votes
1answer
550 views

Why are the power and drag curves called polars?

See Wikipedia:Drag polar and Wikipedia:Polar curve (aviation) for example. These curves are not on a polar coordinate system. Why are they called polars?
5
votes
2answers
9k views

What is the definition of "best L/D"?

What does "best L/D" mean? Is it meaningless without context? Do you need to know "best for what?" Or, is it synonymous with max L/D?
13
votes
1answer
926 views

How can I get the velocity-power curve for a particular aircraft?

The answer for How does wind affect the airspeed that I should fly for maximum range in an airplane? refers to a velocity/power-required curve. As far as I can tell, this curve can't be deduced from ...
7
votes
2answers
4k views

How to start deriving longitudinal equations of motion for an aircraft?

I hope this is a relevant place for me to ask a math question regarding aircraft design. I am trying to understand how one would implement a controller to control the pitch angle of an airplane for a ...
39
votes
4answers
4k views

Is a rotary wing craft capable of supersonic flight?

Just what the title states. Since the Wright brothers, aviation technology for fixed-wing craft has advanced by an order or more. Rotary wing craft on the other hand (I know little about aviation; ...

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