3 edition of The lift-fan aircraft found in the catalog.
The lift-fan aircraft
W. H. Deckert
1995 by National Aeronautics and Space Administration, Ames Research Center, National Technical Information Service, distributor in Moffett Field, Calif, [Springfield, Va .
Written in English
|Other titles||Lift fan aircraft.|
|Statement||Wallace H. Deckert.|
|Series||NASA contractor report -- 196694., NASA contractor report -- NASA CR-196694.|
|Contributions||Ames Research Center.|
|The Physical Object|
This was done by balancing the centripetal twisting moment on the blades and a set of counterweights against a spring and the aerodynamic forces The lift-fan aircraft book the blade. The engines and fans are interconnected by an elaborate system of cross-shafts so that any engine can deliver power to either side of the airplane. Two years later, the Blackbird was retired. It is a unique, very complex design. Notice: Calculations assume a rectangular platform with a slope or wedge shape at the front. They are sometimes referred to as "handed" propellers since there are left hand and right hand versions of each prop.
It underwent tethered The lift-fan aircraft book between and but never flew untethered. Notice: Calculations assume a rectangular platform with a slope or wedge shape at the front. Therefore, most propellers use a variable pitch mechanism to alter the blades' pitch angle as engine speed and aircraft velocity are changed. This is done after submitting by pressing the "flair" button under your post. The use of individual electrical wires rather than a shaft to transmit power to the fans allows complex algorithms run by triply redundant flight control computers to adjust the amount of power sent to each fan independently. Of the several airframe and engine proposals returned for consideration, Lockheed's aircraft and General Electric's engine were selected for the new design in
The maximum relative velocity is kept as low as possible by careful control of pitch to The lift-fan aircraft book the blades to have large helix angles; thin blade sections are used and the blades are swept back in a scimitar shape Scimitar propeller ; a large number of blades are used to reduce work per blade and so circulation strength; contra-rotation is used. Quite possibly sonic booms from a long-suspected hypersonic attack vehicle, a sleek aircraft that has consumed the imaginations of black-project enthusiasts and military analysts, including me, for two decades. Calculator created by Alex Olshove and provided here as a courtesy to hovercraft enthusiasts. On-Time Delivery The Vehicle: Aurora Mach 6-plus attack aircraft The Technology: Ramjet-powered delta wing The Evidence: Telltale sonic booms; unconfirmed sightings; unresolved history of long-rumored program; recent development of key technology; large, unexplained current budget allocation Is speculating on top-secret military technology a national security risk? It is a unique, very complex design.
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Some examples such as the XM-2 of have been able to hover within ground effect.
We studied year-old seismograph data from the California Institute of Technology, whose uniquely sensitive sensors could actually track the booms.
The Verticraft Verticar of was a similar single-fan, directed-thrust, all-wing or lifting body aircraft, of conventional but very low-aspect-ratio wing planform. More air is taken in and the fan therefore operates at an efficiency equivalent to a larger un-ducted propeller. According to the company, due to the fact that little in the way The lift-fan aircraft book speed The lift-fan aircraft book required to achieve lift, FanWings can take off and land on very short runways.
Most feathering systems for reciprocating engines sense a drop in oil pressure and move the blades toward the feather position, and require the pilot to pull the propeller control back to disengage the high-pitch stop pins before the engine reaches idle RPM.
This type of constant-speed propeller was used on many American fighters, bombers and transport aircraft of World War II Early pitch control settings were pilot operated, either with a small number of preset positions or continuously variable.
Frank Cappuccio, the avuncular vice president of Lockheed Martin's secretive Skunk Works division, opens a press conference by introducing what he calls a promotional video, "something to show the kids and families about what we do. Calculator created by Alex Olshove and provided here as a courtesy to hovercraft enthusiasts.
The company website doesn't say how they calculated thrust. The bpr in VTOL operation was The wingtip thrusters can also rotate independently and the louvers of the body lift fans can be adjusted to provide directional control at low speed as well.
These were unducted but I doubt that any The lift-fan aircraft book ducted fan produces more thrust than eight 50cm propellers can. In most aircraft this system is hydraulic, with engine oil serving as the hydraulic fluid.
It underwent tethered trials between and but never flew untethered. Images must be clear and obvious as to the content. The basic propulsion unit, the ramjet, is no more than a tapered tube with a fuel injector and burner in the middle and a thrust nozzle at the end.
Vibratory Many types of disturbance set up vibratory forces in blades. First of all, why would anyone want to build an airplane this way? Though seemingly dormant in recent years, the program appears to be on the move again, and with a renewed vigor that has me feeling, somewhat unsettlingly, a bit like the aerospace industry's own Ahab.
This sub is for real designs that were made in the real world; this means no photoshops, kitbashing, or purely fictional "what ifs. For takeoff and landing, doors and Venetian-blind vanes cascade open, and the fans lift the airplane vertically.
These prototypes could revolutionize combat missions, military and civilian search-and-rescue The lift-fan aircraft book, civilian air travel, cargo delivery — you name it. The gray airplane is Polecat, a next-generation stealth unmanned aerial vehicle UAV -Cappuccio's video was his sly way of unveiling the program.
Genesis of the F joint strike fighter. It will weigh pounds kg empty, and have a maximum take-off weight of 1, pounds kg.
If you want to locate The lift-fan aircraft book or sporadic radio transmissions-such as cellphones or scattered satellite phones The lift-fan aircraft book by insurgent groups-the airship is an ideal platform.
What follows is inescapably an educated guess, arrived at by analysis of the available evidence, at the tantalizing designs being cooked up on the sly at Area 51, including a radical special-forces transport, a stealthy UAV, an agile new bomber, and my own white whale-the mythical, hypersonic dragster and presumed source of those faux earthquakes: Aurora.
Cut to April 4 this year. New aircraft can take years to develop. An even simpler version is the ground-adjustable propellerwhich may be adjusted on the ground, but is effectively a fixed-pitch prop once airborne.(1)assess the effects of lift-fan propulsion system design features on aircraft control during transition and vertical flight including integration of lift fan/lift/cruise engine/aerodynamic controls Cited by: 5.
Lift fan is an aircraft configuration in which lifting fans are located in large holes in an otherwise conventional fixed wing or fuselage. It is used for V/STOL operation. The aircraft takes off using the fans to provide lift, then transitions to fixed-wing lift in forward flight.
Feb 01, · This paper discusses aircraft control power requirements provided by lift fan systems. Gas power transfer is described and estimated performance presented. A performance comparison is made between the thrust spoiling system used in the present Army XV-5A flight research vehicle and a Cited by: 1.F uses lift fan which can create pdf, lbs (9 tonnes) of lift in a small compact platform.
I can see three or four of such lift fans that could lift a heavier plane and is seems better than a helicopter because it can travel at higher speeds.The present study aimed at studying the transition download pdf annular lift fan aircraft through computational fluid dynamics (CFD) simulations.
The oscillations of lift and drag, the optimization for the figure of merit, and the characteristics of drag, yawing, rolling and pitching moments in transition are studied. The results show that a two-stage upper and lower fan lift system can generate Cited by: 2.This is a passage in a book called Ebook Wings: Chinese Fighter and Bomber Aircraft Development that provides more information about the No.4 Lift-Fan: There have been rumours about proposals, or perhaps better to say suggestions, for a V/STOL type aircraft.