The Air Propeller
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In our eReader you can find the full English version of the book. Read The Air Propeller Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Air Propeller
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As an illustration, if a 10 ft. Propeller creates no thrust when its forward travel per revolution is V/N = 9 ft. , the dynamic pitch ratio is V /ND = 9-1-10 = 0. 9. This is a constant of the propeller and is the same whether V and N be large or small. Practical values for dynamic pitch ratio are between 0. 5 and 1. 5.
28 Slip.
Positive thrust is obtained only when the forward travel per revolution, or the effective pitch, is less* than the dynamic pitch. The difference between the dynamic pitc...h and the effective pitch, expressed as a percentage of the former, is called the slip. Thus, when a propeller with a dynamic pitch of 8 feet travels forward only 6 feet in one revolution, the slip is 25 per cent. , or 0. 25.
When the slip is 5 per cent. , the forward travel per revolu- tion is V IN effective pitch = (i s) dynamic pitch. As a ratio in terms of D, we have accordingly V IND = effective pitch ratio = (i s) dynamic pitch ratio.
It is seen that when the slip is zero, the effective pitch becomes equal to the dynamic pitch.
What to read after The Air Propeller?
You can find similar books in the "Read Also" column, or choose other free books by Frederick Bedell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
As an illustration, if a 10 ft. Propeller creates no thrust when its forward travel per revolution is V/N = 9 ft. , the dynamic pitch ratio is V /ND = 9-1-10 = 0. 9. This is a constant of the propeller and is the same whether V and N be large or small. Practical values for dynamic pitch ratio are between 0. 5 and 1. 5.
28 Slip.
Positive thrust is obtained only when the forward travel per revolution, or the effective pitch, is less* than the dynamic pitch. The difference between the dynamic pitc...h and the effective pitch, expressed as a percentage of the former, is called the slip. Thus, when a propeller with a dynamic pitch of 8 feet travels forward only 6 feet in one revolution, the slip is 25 per cent. , or 0. 25.
When the slip is 5 per cent. , the forward travel per revolu- tion is V IN effective pitch = (i s) dynamic pitch. As a ratio in terms of D, we have accordingly V IND = effective pitch ratio = (i s) dynamic pitch ratio.
It is seen that when the slip is zero, the effective pitch becomes equal to the dynamic pitch.
What to read after The Air Propeller?
You can find similar books in the "Read Also" column, or choose other free books by Frederick Bedell to read onlineMoreLess
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