# The Principles Of Aeroplane Construction; With Calculations, Formulae, And 51 Diagrams

## byRankin Kennedy

not yet rated|write a review
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...as planes flying through the air. In no case should the planes deflect the air upwards. Any action deflecting the air up must have a reaction forcing the plane down. A form of blade shown in Fig. 17 is therefore bad for a flying plane; so also is that shown in Fig. 18. Both of them cause an upward deflection, as shown by the stream-lines. These bad forms have what is called a " dipping front edge." It has repeatedly been claimed that such a bad form gives a greater lift when the plane is held in a moving current of air and not allowed to move horizontally. But it has never been proved that this form gives a greater lift on a plane flying through still air, and that is the condition under which planes act in flying-machines. The dipping front edge is not very prominent in the best examples of flying-machines which Fig. 18. have been used to win the large prizes, while none of them with pronounced dipping edges have ever flown at all with success. The best curve in practice seems to be pretty near that shown in Fig. 19. The three straight sides of the triangle of the plane--ab the base, be the perpendicular, and ac the plane--are shown. Taking ac as a chord, the curve is given by the abscissa, showing the curve of the under face of the plane; the upper curve is made so that the plane is thickened towards the front edge, and then tapers to a point, as in Fig. 16. The fact in this matter is that no one curve is "the best." A "best curve" could be found only for one plane working always at the same angle of incline to the line of flight, but in practice the plane has to work at different angles to the line of flight--sometimes a small angle, sometimes with a large angle; hence it is that the curve must be a medium...

### Pricing and Purchase Info

\$17.61

In stock online
Ships free on orders over \$25

From the Publisher

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...as planes flying through the air. In no case should the planes deflect the air upwards. Any action deflecting t...

Format:PaperbackDimensions:22 pages, 9.69 × 7.44 × 0.05 inPublished:October 12, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217767052

ISBN - 13:9780217767057

Look for similar items by category: