The work done by the propellers equals the product of the resistance times the distance through which the airship moves. The unit of work in the English system is the foot-pound, or the quantity of work performed by 1-pound force acting through a distance of 1 foot. Hence work done in propelling the airship in footpounds equals resistance in pounds times air distance traveled by the airship.
Power is defined as the rate of doing work, 1 horsepower equaling foot-pounds per second. Therefore the power utilized to overcome hull resistance must equal resistance multiplied by velocity in feet per second divided by The resistance is given by the equation see sec. Problem and solution- 1 Problem. The propeller efficiency, E, is 60 percent. The envelope resistance, F, is 40 percent of the total resistance of the airship.
As illustrated in the problem in d above, the following is a convenient formula for the horsepower required when the percentage of resistance due to the hull and the propeller efficiency are known. A commoner method of determining the horsepower requirements is to determine a shape coefficient by wind tunnel test of the completely rigged model. In this case the body in question is not as perfect a streamlined shape as the hull itself so the resistance varies more nearly as the square of the velocity.
Then the horsepower required becomess-0 D p vol v8 H. Results of various speed trials. The proportional val ue of the appendages or parasiw resistance was computed from the wind t unnel data. Burgess formula for horsepower. Home Technical manual of airship aerodynamics. Fundamentals of Aerodynamics [5 ed.
Airship: Design, Development and Disaster , Airship charts the history of lighter-than-air craft from the continental pioneers of the late 19th century through to E 57 12MB Read more. This volume includes: physical and mathematical aspe 25 12MB Read more. Fundamentals of Modern Unsteady Aerodynamics [3 ed. Compressor aerodynamics [1 ed. Intake Aerodynamics [1] , This book — the first of its kind — covers ab initio the aerodynamics of subsonic and supersonic intakes in civil and mi 96 17MB Read more.
Tempeh Production. The Book of Tempeh: Volume 2. The Art of Technical Writing Technical writing is used in all fields of science, technology, agriculture, engineering and social sciences. From a sim 97 11MB Read more. Fundamentals of Aircraft and Airship Design: Volume I--Aircraft Design , The aircraft is only a transport mechanism for the payload, and all design decisions must consider payload first.
Simply MB Read more. Close Submit. Erfahren Sie, wie wir und unser Anzeigenpartner Google Daten sammeln und verwenden. Search Open Access. Who People and organizations associated with either the creation of this book or its content. Authors United States. Air Corps. Publisher United States. Government Printing Office. Place of Publication: Washington, D. About Browse this Partner. What Descriptive information to help identify this book. Titles Main Title: Airship aerodynamics.
Alternate Title: Technical manual, airship aerodynamics. Series Title: War Department technical manual. Notes Includes glossary. Listed in Monthly catalog, p. Subjects Keywords Airships -- Aerodynamics -- Terminology.
World War, -- Aerodynamics -- Study and teaching. World War, -- Air pilots, Military -- Handbooks, manuals, etc. World War, -- Airships -- Piloting.
Language English. Item Type Book. Identifier Unique identifying numbers for this book in the Digital Library or other systems. Collections This book is part of the following collections of related materials. About Browse this Collection. Digital Files 72 image files available in multiple sizes Metadata API: descriptive and downloadable metadata available in other formats.
When Dates and time periods associated with this book. Creation Date February 11, Description Last Updated April 29, , p. Usage Statistics When was this book last used?
0コメント