Air Screws An Introduction to the Aerofoil Theory of Screw Propulsion
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To quickly assess the difficulty of the text, read a short excerpt:
As a rule, in practice it is found that the actual recorded efficiencies of air-screws are higher than those given by the theory.
Since (Z) may be taken as equal to (2) for a maximum value of (??), the maximum value of (77) will be obtained by substituting this value for (Z) in the efficiency formula. We shall take (tan 7) as being equal to ^ as before, and then we have the value of (?;) as ('84). Hence the maximum overall efficiency of a, n air-screw having a " Eational" blade shape is (84%) w...hen (tan 7) = ^ and (Z) = (2).
Suppose that we wish to design an air-screw for an aeroplane having a speed (Y) of (100) feet/sec. , a rotational speed (11) of (20) revs. /sec. , a diameter (d) of (9) feet, and having a motor capable of developing an effective horse-power (H) of (100).
Then 1} and hence (P) - Y - = 5 feet.
( /Z' ) .. \J S Ji> (d) = 9 (H) = 100 Let the spacing of the sections along the blade be such as already given with a uniform " angle of attack " of (4), and hence let the curves of $(#) and ^(x) be such as given in Kg.
What to read after Air Screws An Introduction to the Aerofoil Theory of Screw Propulsion?
You can find similar books in the "Read Also" column, or choose other free books by M a S Riach to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
As a rule, in practice it is found that the actual recorded efficiencies of air-screws are higher than those given by the theory.
Since (Z) may be taken as equal to (2) for a maximum value of (??), the maximum value of (77) will be obtained by substituting this value for (Z) in the efficiency formula. We shall take (tan 7) as being equal to ^ as before, and then we have the value of (?;) as ('84). Hence the maximum overall efficiency of a, n air-screw having a " Eational" blade shape is (84%) w...hen (tan 7) = ^ and (Z) = (2).
Suppose that we wish to design an air-screw for an aeroplane having a speed (Y) of (100) feet/sec. , a rotational speed (11) of (20) revs. /sec. , a diameter (d) of (9) feet, and having a motor capable of developing an effective horse-power (H) of (100).
Then 1} and hence (P) - Y - = 5 feet.
( /Z' ) .. \J S Ji> (d) = 9 (H) = 100 Let the spacing of the sections along the blade be such as already given with a uniform " angle of attack " of (4), and hence let the curves of $(#) and ^(x) be such as given in Kg.
What to read after Air Screws An Introduction to the Aerofoil Theory of Screw Propulsion?
You can find similar books in the "Read Also" column, or choose other free books by M a S Riach to read onlineMoreLess
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