SKU: 8775922812

Helicopter Theory

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Description

Helicopter TheoryThe history of the helicopter may be traced back to the Chinese flying top (c. 400 B. C.) and to the work of Leonardo da Vinci, who sketched designs for a vertical flight machine utilizing a screw type propeller. In the late nineteenth century, Thomas Edison experimented with helicopter models, realizing that no such machine would be able to fly until the development of a sufficiently lightweight engine. When the internal combustion gasoline engine

The history of the helicopter may be traced back to the Chinese flying top (c. 400 B.C.) and to the work of Leonardo da Vinci, who sketched designs for a vertical flight machine utilizing a screw-type propeller. In the late nineteenth century, Thomas Edison experimented with helicopter models, realizing that no such machine would be able to fly until the development of a sufficiently lightweight engine. When the internal combustion gasoline engine came on the scene around 1900, the stage was set for the real development of helicopter technology.
While this text provides a concise history of helicopter development, its true purpose is to provide the engineering analysis required to design a highly successful rotorcraft. Toward that end the book offers thorough, comprehensive coverage of the theory of helicopter flight: the elements of vertical flight, forward flight, performance, design, mathematics of rotating systems, rotary wing dynamics and aerodynamics, aeroelasticity, stability and control, stall, noise and more.
Wayne Johnson has worked for the U.S. Army and NASA at the Ames Research Center in California. Through his company Johnson Aeronautics, he is engaged in the development of software that is used throughout the world for the analysis of rotorcraft. In this book, Dr. Johnson has compiled a monumental resource that is essential reading for any student or aeronautical engineer interested in the design and development of vertical-flight aircraft.



Binding Type: Paperback
Publisher: Dover Publications
Published: 10/06/1994
ISBN: 9780486682303
Pages: 1120
Weight: 2.44lbs
Size: 8.22h x 5.62w x 2.00d
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SKU: 8775922812

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Lauren
Massapequa, US
★★★★★ 5
The best for sensitive skin and sensitive noses
Style: SPF 50, Size: 5 Fl Oz (Pack of 1)
This is the absolute best sunscreen I have found for my super reactive sensitive skin. I have never had any issues with this sunscreen and it prevents sunburn well. I am also super sensitive to smells and this doesn’t smell like anything to me. It gives a really pretty glow to your skin as an added bonus.
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Reviewed in the United States on April 13, 2026
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Nancy M.
Carnegie, US
★★★★★ 5
Don't leave home without it!
Style: SPF 50, Size: 10 Fl Oz (Pack of 1)
This sunscreen has been a lifesaver for me. I'm an avid kayaker, have a very fair complexion and hate wearing hats, so I'd be toast (literally) without this. I'm also now allergic to fragrance and several commonly used preservatives, so to find that this sunscreen has no fragrance and none of the suspect additives was a joy. It goes on lightly, rubs in easily and seems to really hold up protecting my skin for 2-3 hour trips on the lake. I never leave home without it. The only drawback I have is that it's sometimes cumbersome, or difficult to get the top to line up correctly in order to spray it and it can be unwieldy trying to do this with one hand. I haven't found anything better, and really appreciate that it's available and not at an outrageous price either.
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Reviewed in the United States on March 13, 2026
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Mike
Draper, US
★★★★★ 1
spray top lids fail after a few uses
Style: SPF 50, Size: 10 Fl Oz (Pack of 1)
This sunscreen is awesome. It stays on for a long time, even when swimming. It has almost no odor, which is great if you don't want to walk around with that summer sun screen smell. The reason I am giving this only one star is because of the canister. The spray top lid is very hard to press, and only works a few times before completely jamming, rendering the product useless. This is a huge problem if you are taking it on a river float, or camping where you can't just run out to the store and get another one if it stops working. I love this sunscreen and I really wish I could make it my summer go to, but have had so many of the lids malfunction that I will never buy this product again. It is expensive for sunscreen. They should figure out their packaging.
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Reviewed in the United States on August 2, 2025
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Omaha, US
★★★★★ 5
a fave
Style: SPF 50, Size: 5 Fl Oz (Pack of 1)
Disappears into skin quickly, feels like nothing, looks like nothing (no white residue, streaks or discoloration). The fragrance free truly is. I reapply after a couple of hours or prolonged time in salt water even though I don't _feel_ like I need to (I'm not naturally pale) and have not had any burns since I started using Alba products, whereas before, I got occasional burns even from the better, former favorite, brands. I love this brand and the products are prominent on my subscribe and save lists. Once in a blue moon, the spray lid sticks and the can goes in the trash. BUT this happens once in a blue moon with just about every brand I've tried.
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Reviewed in the United States on July 6, 2023
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Amanda G
Boise, US
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Great, when the can works
Style: SPF 50, Size: 5 Fl Oz (Pack of 1)
This is the only sunscreen I buy anymore. Clear, easy to use and no significant smell. Plus air powered spray and biodegradable. No of which matters, though, when the can won't spray at all or just gives a weak spray that leaves sunscreen in wet spots or no coverage on your arms. Too expensive to not work.
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Reviewed in the United States on June 8, 2023

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