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Some designs may use a ducted fan design to increase upward thrust. Several inventors have tried to make backpack helicopters, with mixed results. Typically, a backpack helicopter differs from a conventional helicopter in two main ways: First, there is no tail rotor, and the main rotors are contra-rotating. Yaw is controlled by fine adjustment ...
Modern Japanese taketombo bamboo-copters; wooden type with winding thread (left); plastic type (right) A decorated Japanese taketombo propeller. The bamboo-copter, also known as the bamboo dragonfly or Chinese top (Chinese zhuqingting (竹蜻蜓), Japanese taketonbo 竹蜻蛉), is a toy helicopter rotor that flies up when its shaft is rapidly spun.
Dragonflies can be mistaken for the closely related damselflies, which make up the other odonatan infraorder and are similar in body plan, though usually lighter in build; however, the wings of most dragonflies are held flat and away from the body, while damselflies hold their wings folded at rest, along or above the abdomen. Dragonflies are ...
The dragonfly wants to inspire you to connect to the earth and with yourself in a more conscious and magical way." But dragonflies are not the only insects that act as messengers in your dreams!
Dragonfly HC.2 Casualty evacuation helicopter for the Royal Air Force similar to the commercial Mark 1A, 2 built and one-conversion from a civil Mark 1A. Dragonfly HR.3 Air-sea search and rescue helicopter for the Royal Navy. Similar to the Dragonfly HR.1, but fitted with all-metal rotor blades, 71 built some later modified as HR.5s. Dragonfly HC.4
An example of the effect of rotor blade number is the UH-72 (EC145 variant); the A model had four blades, but the UH-72B was changed to five blades which reduced vibration. [24] Other blade numbers are possible, for example, the CH-53K , a large military transport helicopter has a seven blade main rotor.
Bensen B-10 (ducted fan) Boeing/McDonnell Douglas AV-8 Harrier (vectored thrust) Boeing-Vertol VZ-2 ; Boeing X-32B (vectored thrust) Boeing X-50 (stoppable-rotor gyrodyne UAV - failed to achieve forward flight) Boulton Paul P.137 VTOL research aircraft; Boulton Paul P.142 VTOL research aircraft; British Aerospace P.125
Fan-site, photo gallery, forums and review with pictures of Dragonfly; Flytech Dragonfly Information page (plus YouTube video) it is a big fly; Flytech Dragonfly Inventor Sean Frawley – a discussion of remarkable materials, painstaking development and that spark of inspiration. Review of the FlyTech Dragonfly by Craig Johnson of The LED Museum