{ "item_title" : "How Do Helicopters Fly?", "item_author" : [" M. Roy "], "item_description" : "How Do Helicopters Fly? answers one of the most fascinating questions in aviation science-How can a heavy machine rise straight up, hover in the air, and move in any direction?Written in simple, easy-to-understand English, this book explains the science behind helicopter flight using clear explanations, real-life examples, and helpful diagrams.What you will learn in this book: Why helicopters do not need runwaysHow rotor blades act like rotating wingsHow lift is produced in helicoptersWhat angle of attack means and why it is importantWhy helicopters do not spin (tail rotor explained)How helicopters hover in one placeHow helicopters move forward, backward, and sidewaysVertical take off and landingAutorotation - how helicopters land safely if the engine failsReal-life uses of helicopters (rescue, medical, military, firefighting)Who this book is for: Students of Class 8-12ICSE, CBSE, and State Board learnersBeginners curious about aviationTeachers looking for simple explanationsAnyone interested in how helicopters workThis book focuses on concept clarity, not heavy mathematics.It is ideal for exam preparation, general knowledge, and scientific curiosity.Also by the author: How Do Airplanes Fly?", "item_img_path" : "https://covers3.booksamillion.com/covers/bam/9/79/824/421/9798244213454_b.jpg", "price_data" : { "retail_price" : "8.99", "online_price" : "8.99", "our_price" : "8.99", "club_price" : "8.99", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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