Practical Aeronautics; An Understandable Presentation of Interesting and Essential Facts in Aeronautical Science

Practical Aeronautics; An Understandable Presentation of Interesting and Essential Facts in Aeronautical Science

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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. 1912 edition. Excerpt: ...the crank case of magnalium. Ignition is by means of a Bosch magneto with a special advance device as it is impractical to operate the two-cycle motor with a fixed ignition point, it being necessary to retard the explosion timing considerably in order to start without danger of the motor kicking back. To effect this a helical gear is employed to turn the armature of the magneto with relation to the drive. The four-cylinder Roberts motor with carbureter and magneto weighs 165 pounds and develops 52 horse-power at 1,400 r. p. m., while the six-cylinder weighs 220 pounds and develops 78 horse-power at 1,500 r. p. m, . or 3.17 and 2.8 pounds per horse-power, respectively. Fox. The Fox aero motor is another two-cycle type that is distinguished by the use of a special fourth port. Apart from this, the motor is of practically the conventional three-port type. This fourth port, known as an accelerator, is an opening placed below the third port and is designed to admit air alone, which goes through a by-pass on the side of the cylinder, where the fourth port is uncovered by the upward stroke of the piston immediately after the opening of the third port. The incoming fuel charge through the latter is deflected toward the bottom of the crank case, while the air entering through the fourth part is deflected upward and is pocketed under the piston until the opening of the intake port, entering the explosion chamber in advance of the fuel charge. It accordingly serves to drive out the exploded gases in advance of the entrance of the fresh fuel, thus increasing the power and making the motor more economical. The external opening of this fourth port is directly controlled by the operator through a lever, so that it may be closed entirely, when the motor..show more

Product details

  • Paperback | 240 pages
  • 189 x 246 x 13mm | 435g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236957369
  • 9781236957368