Propellers

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The three best propellers in an experimental round by Hiram Stevens Maxim.[1]
Sizes and speeds of propellers used by notable French dirigibles.

A propeller (hélice or propulseur) is typically an engine-driven whirling set of blades which displace air to move a vessel forward.

Propellers rely on motors with an energy source such as steam, petroleum, or an electrical battery.

Early aerostats were difficult to steer (for various reasons including their shape) and propellers were used commonly in the later nineteenth century as part of designs for "dirigible airships" that could move faster and in a chosen direction.

Propellers were essential to the standard design of airplane which emerged in the twentieth century.

The main alternatives to propellers for aerial propulsion were flapping wings and various "jet" systems using streams of air.

Enclosing categories Propulsion, Aerial navigation
Subcategories Aerial propellers
Keywords Propulseur, Hélice, fan, CPC B64C11/46, USPC 244/62, DE 77h.6
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Propeller placement

Maxim on propeller placement:

Many experimenters have imagined that a screw is just as efficient placed in front of a machine as at the rear, and it is quite probable that, in the early days of steamships, a similar state of things existed. [...] It would appear that many, having noticed that a horse-propelled carriage always has the horse attached to the front, and that the carriage is drawn instead of pushed, have come to the conclusion that, in a flying machine, the screw ought, in the very nature of things, to be attached to the front of the machine, so as to draw it through the air. Railway trains have their propelling power in front, and why should it not be the same with flying machines? But this is very bad reasoning. There is but one place for the screw, and that is in the immediate wake, and in the centre of the greatest atmospheric disturbance. While a machine is running, although there is a market difference between water and air as far as skin friction is concerned, still the conditions are the same as far as the position of the screw is concerned.

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References

This wiki has 1,052 patents categorized in "Propeller" or "Propellers". Other techtypes related to Propeller or Propellers: Blades, CA 115, CA 115/32, CA 244/8, Cage, CH 128c, CH 129c, CPC B63H1/12, CPC B64B1/70, CPC B64C11/00, CPC B64C11/001, CPC B64C11/003, CPC B64C11/005, CPC B64C11/006, CPC B64C11/008, CPC B64C11/06, CPC B64C11/065, CPC B64C11/12, CPC B64C11/14, CPC B64C11/16, CPC B64C11/18, CPC B64C11/22, CPC B64C11/24, CPC B64C11/28, CPC B64C11/30, CPC B64C11/301, CPC B64C11/34, CPC B64C11/343, CPC B64C11/36, CPC B64C11/38, CPC B64C11/42, CPC B64C11/46, CPC B64C11/48, CPC B64C27/48, CPC B64D2700/62657, CPC B64D2700/62692, CPC B64D2700/62701, CPC B64D2700/62719, CPC B64D2700/62736, CPC B64D2700/62789, CPC B64D2700/62807, CPC B64D2700/62824, CPC B64D2700/62842, CPC B64D35/06, CPC F01D5/22, CPC F01D5/24, CPC F05B2210/16, CPC F05B2260/00, CPC F05B2260/70, CPC F05B2260/72, DE 77, DE 77h.6, Heavier-than-air, Hélice, Helicoplane, Helicopter, Human-powered, Propulseur, Pusher, Rarefaction, Tractor, USPC 244/17.17, USPC 244/51, USPC 244/6, USPC 244/65, USPC 244/66, USPC 244/67, USPC 244/68, USPC 244/69, USPC 244/7, USPC 244/71, USPC 244/73, USPC 244/74, USPC 244/9, USPC 244/92, USPC 416/112, USPC 416/120, USPC 416/124, USPC 416/127, USPC 416/128, USPC 416/129, USPC 416/146, USPC 416/148, USPC 416/149, USPC 60/269, Windmill

Patents in categories Propeller or Propellers

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