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Description
ASA Principles of Helicopter FlightFor the student learning to fly helicopters in the 21st century, this book is one of the essential keys to flight. Helicopter pilots need to thoroughly understand the consequences of their actions, and base them upon sound technical knowledge. This textbook provides a foundation by explaining why the helicopter flies and, more importantly, why it sometimes doesn't. It examines the aerodynamic factors associated with rotor stalls, mast bumping, and
For the student learning to fly helicopters in the 21st century, this book is one of the essential keys to flight.
Helicopter pilots need to thoroughly understand the consequences of their actions, and base them upon sound technical knowledge. This textbook provides a foundation by explaining why the helicopter flies and, more importantly, why it sometimes doesn't. It examines the aerodynamic factors associated with rotor stalls, mast bumping, and wind effect, as well as maneuvering flight to include the hover, forward flight, flare, and auto-rotation. Helicopter design and components, performance, and weight and balance are covered, along with special techniques such as different types of takeoffs and landings, operating on sloping surfaces, sling operations, mountain flying, and helicopter icing. Technical knowledge and sound handling are the crucial ingredients that make a safe pilot.
This second edition benefits from additional discussion of the NOTAR system and strakes, as well as frequently misunderstood principles of airspeed and high altitude operations. The book also concludes with a multiple-choice practice examination; used in conjunction with quizzes for each chapter, the reader can test their grasp of helicopter aerodynamics.
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4.3 ★★★★★
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★★★★★ 5
Best battery power lights on the market
These light are great, easy to use just pull apart then wrap around the umbrella pole, holds on securely where you want it, provides 3 light setting, bright light. When done with the lights either turn them off or remove the batteries and store them away for the next time. Set of 2 lights. Great buy.
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Reviewed in the United States on July 23, 2019
★★★★★ 3
Good, but use batteries
These work good, very bright lights. But I wish I would have gotten the solar ones. These take batteries and I don't want to keep buying batteries.
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Reviewed in the United States on August 7, 2025
★★★★★ 5
Very bright
These lights are very useful when we’re eating on our deck.. it’s very bright with 3 different settings
I do recommend
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Reviewed in the United States on July 26, 2024
★★★★★ 5
Different than most on the market worth a try!
I’ve tried a lot of pimple patches and these actually feel different from most of the ones on the market because of the sulfur/OptiMSM ingredient combination. They don’t just cover the spot — they seem to really help bring everything to the surface faster. I had one deep pimple that had been under my skin for so long I honestly started wondering if it was just a scar at that point, and this patch finally helped it come out and heal. The patches are super thin and blend into the skin really well, so they’re easy to wear during the day or overnight. They stick well without feeling harsh on my skin, and I also tried them on my tween sons, who definitely need to wash their noses better sometimes, and they seemed to work really well on their softer skin too without causing irritation. I also love the little travel pouch included. Definitely one of the more effective acne patches I’ve used.
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Reviewed in the United States on May 25, 2026
★★★★★ 4
Halo patches
I tried the Halo Dot Ultra Thin Pimple Patches, and overall I’m really impressed with them. In terms of effectiveness, they work well at helping bring pimples to a head and protecting spots overnight so they don’t get worse or irritated. The value for money is good since you get a decent amount in the pack and they’re thin enough to use during the day or night without being too noticeable. They’re super easy to use—just clean skin, place the patch, and go—and I like that they stay in place pretty well. I also find them pretty versatile, since you can wear them at home or out and about if you get a discreet one. For skin sensitivity, they’ve been gentle on my skin with no irritation, which is a big plus for me. Overall, they’re a simple, effective skincare staple I’d definitely keep on hand.
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Reviewed in the United States on June 1, 2026