วันอังคารที่ 25 มิถุนายน พ.ศ. 2556

Park Flying 1-2-3D



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Summary

Park Flying 1-2-3D leads pilots from the basics of learning to fly through to advanced aerobatic and 3D maneuvers.

The Good

The author, David Scott, runs a popular RC flight school. He is also an experienced full-size airplane aerobatic pilot. He has what I call "been there, done that" in spades. His book is best when talking about flying, and every single page where he does that convinced me that this guy knows what he is talking about. The book is packed full of hints, tips, and observations that only come from years and years of experience.

The book is profusely illustrated. Nice diagrams of different model airplanes in flight are often combined with diagrams of the appropriate control stick positions. These combinations are very effective.

The writing style is good. It's all very legible and easy to read. I can easily imagine Mr. Scott standing next to me at the flying field talking me through each maneuver and giving me tips all along the way.

The Bad

The book is only about 100 pages long and costs over $20. On the surface, "bang for the buck" appears to be low. I hesitated to buy a copy in the first place because of the price. Having bought it, I'm happy with my purchase. You don't need hundreds of pages to cover the subject. The book is spiral bound, which I appreciated to be able to hold it in front of me while using an RC flight simulator. I'm sure the binding method added to the printing costs.

At the bottom of many pages he has the abbreviation "KPTR" followed some good advice. It was driving me nuts, because I had no idea what KPTR meant! I finally tracked the definition down to one of the introductory pages: key point to remember. Doh! Using just "Tip" or even better, some sort of graphic, would have been preferable.

The Ugly

The book states that many foam park flyers use flat-plate airfoils. That may have been the case years ago, but I cannot think of a single current commercial foam park flyer design that uses a flat-plate airfoil. Even most of the scratch-built designs use something else. The foamy designs have just gotten more sophisticated over time.

The book also states that flat-plate airfoils tend to be unstable when compared to other airfoils. Flat-plates have sharp stalls, but the overall stability on an airplane is mostly due to other factors besides the airfoil. Much later on in the book he clarifies that he was talking about abrupt stalls.

The page on balancing your airfoil just had me shaking my head. The comments made on that page are only valid if you are working with a very conventional airplane design. This fact needed to at least be mentioned. If you have an unusual airfoil or a canard, for example, then following the advice on that page will lead to very bad results.

It gets worse. On the page on control functions, the book states that ailerons are optional on under-cambered or flat-bottomed wings. That's like saying that a door has to be painted white if it opens to the outside. One thing has absolutely nothing to do with the other. This was not just an oversimplification, but a very misleading statement.

Conclusion

Despite my misgivings about the accuracy of the technical background pages, I strongly recommend this book. It is excellent at what it set out to do: helping you become a better park flyer pilot. The explanations of the more complex and trickier maneuvers are specially good. If there's an aerobatic maneuver (including 3D ones) that you have been trying to master and are having trouble, I can make no better recommendation that to buy and read this book.

http://www.rcadvisor.com/ founder - Home of the best model airplane calculator. Free!

Author of RCadvisor's Model Airplane Design Made Easy and other books.

Host of Ask the RCadvisor in the free weekly http://www.thecrashcast.com/ podcasts.

AMA Scientific Leader and Contest Director #4601.




วันพฤหัสบดีที่ 13 มิถุนายน พ.ศ. 2556

A History of the World In 100 Objects - Book Review



There was once a saying at the height of the British Raj in India (colonial occupation) that "Mad Dogs and Englishmen Go Out in the Noon Day Sun," however, something similar can be applied to Britain's historical establishment because nothing will stop them from looking at the history of man in some very different ways.

Take Neil MacGregor's work where he studies the History of the World in 100 Objects. That's right, the director of the British Museum out-minimalized the super-minimalists, who thinks nothing of finding the fewest arguments or gadgets available to prove a point. It's like motorcycle historians who neatly boil that particular branch of motoring into "petrol" and "non-petrol," with "real" motorcycles as having a four-stroke "petrol" engine and the rest of the world just pretenders.

That they have forgotten the seminal work of Roper and Copeland, as well as Michaud, the engineer who made the motorcycle possible when he realized that two wheels of the same size and a real steering fork are necessary for safe two-wheeling. Yet the contributions of these men are neatly glossed over.

However MacGregor's history works to an astonishing degree. If you look at the firm examples he uses to back up his thesis, it is not as bizarre an idea as one might think.

Take the many shards of and clay pots found in the ancients city-states that were built on earlier cities as they rose from the plains of the Indus or Ganges rivers. The pot here or the tablet there that connects the dots to the pots in the holds of Phoenician traders who spread their culture across the ancient world. It shows that, while many in the historical establishment look down their rather long pince nez glasses at a "popular historian" like MacGregor, they cannot escape the fact that he's often right.

For example, the great statuary of the Greeks and their temples - one idea or two, the choice is yours; MacGregor would likely think they are linked as they define the period of Greek history in which they appeared, as well as for the millennium to follow, even through the rise of Persia and Syracuse and the Romans.

The Romans took the flower of Greek thinking and overlayed it on their "Republic," Aristotelian or Euclidean thought and objects to produce an empire that did last nearly 1,000 years and even survived a period of 100 Caesars in 100 years. The refinement of the Greek school of art and its advancement and morphing under Rome, along with the perfection of thought and the invention of the "sciences" of "history" and "sociology" and the strictures that they exposed are just two more examples of the direction of history.

The development and perfection of illumination by the Church and the many Holy Scribes and monks whose work each day was a page, if they were lucky, saved many of the great early works of man and our history. Illumination and the art of penmanship were two more objects along the way which strongly defined the direction of history and thought and all one has to do is look at them to know their means.

The real revolution comes with the introduction to the West of moveable type of the 15th Century invention of the printing press where, at once, thought could be made available to the masses, not just the nobility. What a concept, the masses learning to read and knowing as much as their "betters." That invention, in itself, and the revolution in though that spun off of it shows that MacGregor is quite right. If you look at the history of the west, it can be defined by 100 distinct objects, including such silly-looking objects as the king's throne made of hunting rifles.

Right there you have two engines of domination, the rifle with which the nobility could shoot their fill and still subjugate the local populace. In the wrong hands, though, history took another turn, didn't it? Imagine the combination of the cannon, rifle and printing press and you have all of the makings of even more revolution.

Then add in the "mechanical muscle" provided by the waterwheel and Canals which helped to speed the spread of thought. Of course, this led to experimentation in other areas such as those of Faraday and Morse and the invention of the telegram so that the world was instantly smaller.

That, in turn, led to more sophisticated printing plants and electronics, computers, the Internet and Worldwide Web.

Each, if you look closely at it, is merely an outgrowth of earlier work that was built on one or two elements of an earlier period. This is why the entertaining and witty MacGregor's work, an Amazon Best Book, works so well. It shows that, indeed, the history of western thought and man can be defined by just 100 objects.

It may look like a real stretch when you first crack the back of the book - yes real print and books - although sometimes you are limited to an eReader versions (there's just something missing) - but it's not as MacGregor shows why he is considered one of the wittiest and insightful historians of his generation. It's an interesting theory that he carries off.

Roberto Sedycias works as an IT consultant for ecommUS-Books