Product Description
This updated second edition, written as a companion to "Flight Without Formulae", examines the mechanics and theory of flight and the various components of piston engine and turbine driven aircraft. It aims to explain simply, without mathematical jargon, how an aircraft flies. This second edition has been revised and covers new aspects of the technology in this field. It also has a new plate section which contains photographs of some engines still in the experimental stages of design. The book also contains 100 questions to aid student revision. ... Read more

Product Description
This report was created for global strategic planners who cannot be content with traditional methods of segmenting world markets. With the advent of a "borderless world", cities become a more important criteria in prioritizing markets, as opposed to regions, continents, or countries. This report covers the top 2000 cities in over 200 countries. It does so by reporting the estimated market size (in terms of latent demand) for each major city of the world. It then ranks these cities and reports them in terms of their size as a percent of the country where they are located, their geographic region (e.g. Africa, Asia, Europe, Middle East, North America, Latin America), and the total world market.

In performing various economic analyses for its clients, I have been occasionally asked to investigate the market potential for various products and services across cities. The purpose of the studies is to understand the density of demand within a country and the extent to which a city might be used as a point of distribution within its region. From an economic perspective, however, a city does not represent a population within rigid geographical boundaries. To an economist or strategic planner, a city represents an area of dominant influence over markets in adjacent areas. This influence varies from one industry to another, but also from one period of time to another.

In what follows, I summarize the economic potential for the world's major cities for "complete missiles, space vehicle engines, and propulsion units for U.S. Government non-military customers" for the year 2009. The goal of this report is to report my findings on the real economic potential, or what an economist calls the latent demand, represented by a city when defined as an area of dominant influence. The reader needs to realize that latent demand may or may not represent real sales. ... Read more

Customer Reviews (2)

propeller
For the purpose of this paper, the term
"ship" is used to denote a vehicle em-ployed
to transport goods and persons
from one point to another over water.
Ship propulsion normally occurs with
the help of a propeller, which is the
term most widely used in English,
although the word "screw" is some-times
seen, inter alia in combinations
such as a "twin-screw" propulsion plant.
Today, the primary source of propeller
power is the diesel engine, and the power
requirement and rate of revolution very
much depend on the ship's hull form
and the propeller design. Therefore, in
order to arrive at a solution that is as
optimal as possible, some general
knowledge is essential as to the princi-pal
ship and diesel engine parameters
that influence the propulsion system.
This paper will, in particular, attempt to
explain some of the most elementary
terms used regarding ship types,
ship's dimensions and hull forms and
clarify some of the parameters pertain-ing
to hull resistance, propeller condi-tions
and the diesel engine's load
diagram.
On the other hand, it is considered be-yond
the scope of this publication to
give an explanation of how propulsion
calculations as such are carried out, as
the calculation procedure is extremely
complex. The reader is referred to This paper is divided into three chapters
which, in principle, may be considered as
three separate papers but which also,
with advantage, may be read in close
connection to each other. Therefore,
some important information mentioned in
one chapter may well appear in another
chapter, too.
Chapter 1, describes the most elemen-tary
terms used to define ship sizes
and hull forms such as, for example,
the ship's displacement, deadweight,
design draught, length between per-pendiculars,
block coefficient, etc.
Other ship terms described include the
effective towing resistance, consisting
of frictional, residual and air resistance,
and the influence of these resistances

in service.
Chapter 2, deals with ship propulsion
and the flow conditions around the pro-peller(
s). In this connection, the wake
fraction coefficient and thrust deduc-tion
coefficient, etc. are mentioned.
The total power needed for the propel-ler
is found based on the above effec-tive
towing resistance and various
propeller and hull dependent efficien-cies
which are also described. A sum-mary
of the propulsion theory is shown
in Fig. 6.
The operating conditions of a propeller
the ship is sailing and subject to different
types of extra resistance, like fouling,
heavy sea against, etc.
Chapter 3, elucidates the importance
of choosing the correct specified MCR
and optimising point of the main engine,
and thereby the engine's load diagram
in consideration to the propeller's design
point. The construction of the relevant
load diagram lines is described in detail
by means of several examples. Fig. 24
shows, for a ship with fixed pitch pro-peller,
by means of a load diagram, the
important influence of different types of
ship resistance on the engine's contin-uous
service rating.

good man
I am trying man and happy! I go and go contiuesly ... Read more

Product Description
In this book Professor Timnat describes the physical and operating characteristics of a wide range of modern gas turbine engines, giving both their civil and military aviation applications. In addition, ramjets, scramjets, and pulse jets are analyzed, first for ideal conditions, then taking into account real gas effects and losses. Modern aviation applications for a number of airbreathing powerplants are also discussed with particular attention to experimental facilities and the status of hypersonic combustion. Modern trends in the development of jet engines are described with emphasis on important environmental issues such as exhaust pollutants, the greenhouse effect, noise abatement, and ways of complying with regulatory requirements. Supersonic powerplants, V/STOL propulsion, and stealth technology are also discussed in detail. ... Read more

Product Description
Rocket propulsion options for small-scale Mars missions are presented and compared, particularly for the terminal landing maneuver and for sample return. Mars landing has a low propulsive Äv requirement on a ~1-minute time scale, but at a high acceleration. High thrust/weight liquid rocket technologies, or advanced pulse-capable solids, developed during the past decade for missile defense, are therefore more appropriate for small Mars landers than are conventional space propulsion technologies. The advanced liquid systems are characterized by compact lightweight thrusters having high chamber pressures and short lifetimes. Blowdown or regulated pressure-fed operation can satisfy the Mars landing requirement, but hardware mass can be reduced by using pumps. Aggressive terminal landing propulsion designs can enable post-landing hop maneuvers for some surface mobility. The Mars sample return mission requires a small high performance launcher having either solid motors or miniature pump-fed engines.

Terminal propulsion for 100 kg Mars landers is within the realm of flight-proven thruster designs, but custom tankage is desirable. Landers on a 10 kg scale also are feasible, using technology that has been demonstrated but not previously flown in space. The number of sources and the selection of components are extremely limited on this smallest scale, so some customized hardware is required. A key characteristic of kilogram-scale propulsion is that gas jets are much lighter than liquid thrusters for reaction control. The mass and volume of tanks for inert gas can be eliminated by systems which generate gas as needed from a liquid or a solid, but these have virtually no space flight history.

Mars return propulsion is a major engineering challenge; earth launch is the only previously-solved propulsion problem requiring similar or greater performance. Mars in-situ propellant production is a promising concept which offers the potential to reduce the mass which must be transported from earth. However, the use of in-situ propellants does not mitigate the difficulty of designing the return vehicle’s propulsion system. ... Read more

Product Description
The development of hybrid vehicles, prompted by the pressing requirement for the reduction in the environmental impact of land transport, is probably one of the most significant recent advances in automotive technology. The hybrid vehicle is just coming of age, and the first generation of hybrid cars is now available to the general public. Hybrid buses and trolleybuses have already entered regular service.

In this timely book, the authors review recent progress in the development of a range of hybrid vehicles, from small cars to buses and light rail vehicles, and describe the results of field trials and operational experience. Numerous tables, graphs and black-and-white photographs are included while clear references are also featured to aid further investigation.

The volume will be of great interest to engineering and technical staff working in the road and rail vehicle industries, final year undergraduates and postgraduates studying mechanical and automotive engineering, transport planning personnel, and technically literate readers who wish to find out more about this subject. ... Read more

Customer Reviews (1)

History and Technology of Jets
The technology and the history-of-the-technology of jets from the mid 1930's to 1948. Scholarly, technical, historical, and a bit out of breath in tone.

This is a book very much of its time -- published in 1948, an era of victory, certainly, but also one of unease. With the United States aware of the fact that it did not lead in the application of jet airplanes during WWII, the authors look back at the accomplishments of the Germans and the British while looking forward in the hopes that the United States can dominate this new phase of aviation. This is not propaganda, but it does have a gung-ho optimism and an interest in the affairs of American corporations that are typical of America in the post-war period.

While this book is loaded with information about the nuts and bolts of aviation, it is not designed to simply be an engineering manual.

Details: cloth over hardback boards on glossy paper, 232 pp, about 50 black and white illustrations: photographs, schematics, charts, technical drawings, portraits. 2 over-sized foldout illustrations: Cross-Section drawing of a Junkers Jumo-004 Turbojet and a cross-section of a BMW-003.

Table of Contents

1. The Weapon Behind the Revolution
2. How the Nazis Beat Us To It
3. The British Were Early, Too
4. The AAF and American Industry Pull a Miracle
5. The Navy-industry Team Takes the Field
6. A Big Boost From Government Research
7. Tough Problems Still to Be Whipped
8. New Horizons for Flight -- A Glimpse of the Future

Appendices
Chronology of Aircraft Gas-turbine Developments (pp 203-212)
Glossy of Technical Terms and Abbreviations (pp. 213-216)
Bibliography (pp. 217-228)
Index (pp. 229-232)
... Read more