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propeller FLUID SPEED
The speed of the fluid taken into account when calculating the performance and form a propeller or a wing is detected upstream , and sufficiently far from the propeller or the wing, to detect no disturbance, In the formulas that speed undisturbed fluid is designated By "speed at upstream infinity."
• For a wing or a propeller installed in a vehicle in motion, this speed is the vehicle speed.
The fluid velocity is generally constrained by a given environment of the propeller or of the wing. For a wing, the desired vehicle speed, is determined based on the available power to overcome drag. Some tests are effectura, at desired speeds and force of drag and lift determine if our wing is properly sized.
This parameter helps determine the operating point of a propeller.

Changing the velocity of the fluid upstream of the propeller wing or can be made either by dragging the pointer from speedometer, either by typing directly in the Project data> Operating Point tab

The speed received by the profiles of the turbine blade, the propeller airplane, or boat, is different from the speed of the fluid far upstream. The rotation of the propeller or rotor blade creates a tangential velocity.The apparent speed perceived by the blade profiles is a composition of the speed of rotation and the speed of the fluid.
Another phenomenon alters the perceived speed of the profile: The induced velocity.The calculation of the performance of a wing or propeller is in large part to define the induced velocities. Calculating the speed induced along the blade, used to establish the angle of incidence of the profile, and hence the performance of the propeller.