Arducopter max_angle and speed control

In ArduCopter, how does the pitch angle influence the forward speed of the drone? Is there a specific range of pitch angles that allows the drone to maintain its altitude while increasing or decreasing speed? Additionally, beyond what pitch angle does the drone begin to lose altitude, and how does this vary depending on factors such as thrust, weight, and aerodynamic efficiency?

The higher the pitch the higher the speed.

Yes there is.

That depends on weight and thrust. And lift can be added with wings.

Ecalc gives estimatives.

This is basic physics. Here is a kid level document explaing how quadcopter’s fly.
How Quadcopter’s Fly

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