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Topic: Nacelle

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	Nacelle - Wikipedia, the free encyclopedia
		The word nacelle is derived from the Old French nacele, which means a small boat or dinghy, and was in turn derived from the Latin navicella.
		The term is commonly used in the worlds of aviation, nautical and spacecraft design, in order to refer to a covered housing, separate from the fuselage, which usually holds engines, fuel, or equipment.
		In a wind turbine, the nacelle refers to the structure on top of the tower which houses all of the generating components.
	en.wikipedia.org /wiki/Nacelle (232 words)

	Nacelle - Memory Alpha - A Wikia wiki
		Nacelles are usually separated from the main structure of the ship because of radiation generated by the nacelles; when at optimal levels, the radiation could be deleterious to the safety of ship and crew.
		Nacelles are separated from the ship by large pylons, and usually house a Bussard ramscoop at the fore end for the purpose of collecting hydrogen fuel to replenish the impulse engines.
		Nacelles also have a separation system in the event that the ship is damaged and unable to retain the nacelle safely on the pylon.
	memory-alpha.org /en/wiki/Nacelle (521 words)

	Aircraft nacelle ventilation and engine exhaust nozzle cooling - Patent 5586431
		A combined purging and cooling system for the nacelle of an aircraft and the edge pieces of the flap of a two-dimensional exhaust nozzle of a gas turbine engine as claimed in claim 4 wherein said plurality of tubes are disposed in said divergent flap.
		For the nacelle of an aircraft and the edge pieces of the flap of a two-dimensional exhaust nozzle of a gas turbine engine having a fan including a double clam shell configuration for the convergent and divergent flaps of said 2-dimensional exhaust nozzle as claimed in claim 8 wherein said supersonic nozzles are axisymmetrical.
		A current technique for purging the nacelle is to locate a pump adjacent to the exhaust nozzle and pump the ram air that is contained in the nacelle through exhaust ports located at the tail end of the aircraft.
	www.freepatentsonline.com /5586431.html (2069 words)

	Nacelle Design (Site not responding. Last check: 2007-11-04)
		The design of the nacelle involves both the external shape and the inlet internal geometry.
		The nacelle is made as small as possible but must provide space for all accessories plus ventilation for accessory and engine cooling.
		The nacelle diameter tends to be roughly 10% greater than the bare engine to accommodate various engine systems.
	adg.stanford.edu /aa241/propulsion/nacelledesign.html (532 words)

	Nacelle tube - Memory Alpha - A Wikia wiki
		Aboard the Galaxy class USS Enterprise-D, the nacelle tube included a small control room, which was found on deck 25, at the rear of the nacelle, near the plasma injectors.
		The nacelle tube was originally conceived of by "Eye of the Beholder" writer Brannon Braga as a long catwalk that ran the length of the nacelle.
		While not explicitly stated in dialogue, the location of the nacelle tube can be identified by signage (clearly placing it on deck 25 starboard) and by the matte painting vista of the nacelle interior, facing forward to the bussard collector.
	www.memory-alpha.org /en/wiki/Nacelle_tube (361 words)

	Nacelle - Memory Alpha - A Wikia wiki
		De nacelle is een buitenboord constructie op een sterrenschip waarin de Warp spoelen zijn gehuisvest.
		Nacelle's zijn bovendien voorzien van een noodsysteem mocht het schip schade hebben opgelopen.
		Als een nacelle los raakt van het schip terwijl het in warp is dan heeft dit mogelijk tot gevolg dat het schip uiteen getrokken wordt; het schip zelf zou dan met verschillende snelheden zichzelf voortbewegen.
	www.memory-alpha.org /nl/wiki/Nacelle (319 words)

	Aerodynamically contoured, low drag wing engine and engine nacelle combination - Patent 4449683
		The nacelle and pylon have a critical surface region which is an upper side surface portion of the nacelle and the contiguous pylon surface adjacent to a forwardly swept portion of the wing.
		The upper nacelle surface is spaced downwardly and forwardly from the lower aerodynamic surface, with the upper nacelle surface having a rear end positioned rearwardly of the leading edge and a forward end positioned forwardly of the leading edge.
		Desirably, the nacelle is mounted to a pylon, with the pylon having an inboard surface and an outboard surface.
	www.freepatentsonline.com /4449683.html (6306 words)

	Compositesworld.com - Nacelle manufacturers optimize hand layup and consider closed molding methods - May 2004
		Nacelles and thrust reversers are big business: total market size is about $2.8 billion annually, including commercial transports, business jets and general aviation aircraft, according to Nigel Barker, director of research and development at Goodrich Aerostructures (formerly nacelle pioneer Rohr Inc., Chula Vista, Calif., U.S.A,).
		The nacelle, and particularly the thrust reverser, has to be strong enough to withstand air loads during flight and braking, but, according to Jackson, "If we make it stiff enough to resist deflection, typically it will be strong enough for those loads." Eccentric loads are even more important, says Goodrich's Barker.
		Nacelles are complex assemblies of multiple curved panel components, of varying thickness, that are fitted together to encase the engine.
	www.compositesworld.com /hpc/issues/2004/May/465/1 (1327 words)

	Untitled Document
		The Nacelle Barrel: From the rear edge of the nacelle strut forward, the nacelle is a lathed untapered wooden tube.There are three chamfered rings forward of that, and another small ring with a beveled front edge that the domed nacelle caps are attached to.
		There is also a darker grey section on the bottom of the nacelle beginning at the ring holding the nacelle dome cap on.
		The Intercoolers: The two intercoolers on the top of the nacelle and the intercooler in the grove on the nacelle's inboard side were all pulled from the same mold.
	www.hash.com /users/meshula/1701/NacelleTut.html (1090 words)

	Aerospaceweb.org \| Ask Us - Nacelle Vortex Generator
		Compare the size of the large "shark fin" attached to the nacelle to the much smaller generators located just behind and outboard of the pylon attaching the nacelle to the wing.
		Planes generally operate at the highest angles of attack and relatively low speeds during these phases of flight, and surfaces like slats and flaps are commonly deployed as well.
		The combination of high angle of attack, low speed, and deflected slats may cause the flow of air to become erratic as it tries to move around the large nacelle, particularly in the region close to the fuselage.
	www.aerospaceweb.org /question/aerodynamics/q0255.shtml (613 words)

	System for Centering a Turbofan in a Nacelle During Tests
		The nacelle is supported by two struts attached to a two-axis traverse table located outside the wind-tunnel wall.
		The Y and Z components of the deviation from concentricity are measured by four laser displacement sensors mounted on the nacelle and aimed at reflective targets on the center body, which is part of the fan assembly.
		A highly ablative rub strip in the nacelle minimizes the probability of damage in the event that a deviation from concentricity exceeds the radial clearance [<0.004 in.
	www.nasatech.com /Briefs/Feb03/LEW17185.html (537 words)

	www.trekplace.com
		The third nacelle is connected to the aft upper surface of the primary hull.
		There is effectively an upper pair of "nacelles" -- the twin nacelle-equivalent modules within the primary hull's single nacelle, and a lower pair -- the twin nacelles of the engineering hull.
		As previously discussed, the primary hull's single nacelle does not violate the spirit of this rule, and the engineering hull's nacelles are fully visible from the front, so they do not violate this rule either.
	www.trekplace.com /article15.html (2067 words)

	REpower Systems AG: News 2004
		The nacelle is being assembled in several sections.
		First of all the lower part of the nacelle was installed on the tower yesterday with the motor support, part of the cladding and a large part of the cabling.
		In further stages the generator, transformer, deck crane and the upper part of the nacelle cladding will be assembled at a height of 120 meters.
	www.repower.de /index.php?id=151&backPID=214&begin_at=10&tt_news=253&L=1 (339 words)

	DC10 nacelle strakes (David Lednicer) (Site not responding. Last check: 2007-11-04)
		The initial wing stall occured behind the nacelles and forward of the inboard ailerons.
		The problem was traced by flow visualization techniques to the effects of the nacelle wake at high angles of attack and the absence of the slat in the vicinity of the nacelle pylons.
		The vortices mix the nacelle boundary layer air with the free stream and reduce the momentum loss in the wake.
	yarchive.net /air/airliners/dc10_nacelle_strakes.html (327 words)

	BV.141 with tip nacelle
		This had nacelles at each wing tip, giving the pilot the best possible view and the gunners the best field of fire.
		Such an arrangement was duplicated at Wright Field after the war when a wingtip nacelle (also without controls) was mounted to the right hand wing-tip of a B-17.
		Amtmann sat in that nacelle on one occasion and said it felt no different than sitting conventionally in the middle of the plane.
	www.geocities.com /asymmetrics/bv141tip.htm (759 words)

	NextCraft™ B200 Construction 03
		The nacelle construction in going to take a while, and so once the basic structure is aligned, I want it to stay that way during the whole process.
		I glued these nacelle keels to some 1/8" balsa, cut them out, and then glued some tabs to the bottom of each piece, making sure that they were identical.
		I worked out the nacelle design on the wing center section and nacelles so that, although the nacelle rear sections have to be built as "left" and "right", (See below) the front part of the nacelles (the "cowling") can be built from a single plug.
	www.nextcraft.com /b200_construction03.html (2021 words)

	Building the Rosemont 1/72 Spad SA.2
		There were openings in the rear wall of the nacelle for the air to pass through the prop disc and into the engine.
		The nacelle bottom is too thin to carve very much, so I added two strips of 10 thou card that had been sanded to a taper.
		On the original the paneled areas around the front of the fuselage and the nacelle were painted with a paint mixed to nearly but not quite match the CDL color of the fabric covered airframe.
	www.internetmodeler.com /2004/january/aviation/SP_A2.php (2440 words)

	Nacelle Base Drag< (Site not responding. Last check: 2007-11-04)
		Among the many items that are included in an explicit manner, one usually estimates the drag increment associated with a small gap between the engine nozzle and the nacelle.
		Nacelle base drag is a small item, but is representative of the types of drag components that one tries to model in a realistic manner.
		Flow separates and creates a base drag area that may be estimated as the base area (.5 inch times the circumference at the nozzle exit) multiplied by a drag coefficient of about 0.2.
	adg.stanford.edu /aa241/drag/nacbasedrag.html (111 words)

	The Last Nacelle
		He took a deep breath, then pushed the nacelle through the narrow opening of the bottle.
		Then he began the painstaking process of maneuvering his carafologist's pliers into place to lift the nacelle and snap it onto the strut.
		He was tired, though, and the nacelle kept slipping from the grasp of the pliers.
	www.season7-5.com /story2/nacelle.html (1019 words)

	Isolated nacelle
		were allowed on the upper part of the nacelle between 340 degrees and 20 degrees.
		Note also that the resultant nacelle is symmetrical about the vertical plane.
		This example shows that a desired nacelle can be obtained from a radically different initial profile.
	www.tpub.com /content/nasa1995/aiaa-95-1820/aiaa-95-18200004.htm (526 words)

	1995 Fire Publications - Suppression Criteria in Engine Nacelle Fires. (Site not responding. Last check: 2007-11-04)
		The model was constructed to predict the quantity of agent required to suppress a generic engine nacelle fire.
		The experiments indicate that fire hazard is dependent on a large number of parameters including the air velocity, nacelle temperature, fuel type, and system pressure in the nacelle.
		The model illustrates the importance of injection duration, air flow, nacelle free volume, fluid mixing, and fire scenario on the minimum agent suppression requirements.
	fire.nist.gov /bfrlpubs/fire95/art140.html (214 words)

	Boeing: Fabrication Starts On New C-17 Engine/Nacelle Design (Site not responding. Last check: 2007-11-04)
		The nacelle redesign, a major affordability initiative undertaken by McDonnell Douglas, is expected to save more than $4 million in acquisition costs per aircraft.
		The major nacelle design change is the replacement of high cost titanium and composite parts with aluminum components, in particular the fan thrust reverser cascades.
		The nacelle will then undergo ground tests at the Pratt and Whitney facility in West Palm Beach, Fla. Subsequent flight testing will be conducted at Edwards Air Force Base in California from December 1997 thru February 1998.
	www.boeing.com /ids/news/mdc/96-256.html (473 words)

	Nacelle and mounting arrangement for an aircraft engine (US5524847)
		A nacelle and mounting arrangement for a high bypass ratio ducted fan aircraft engine mounted external to the aircraft main structure is disclosed.
		The nacelle and mounting arrangement isolate the engine from the adverse effects of certain aerodynamic forces acting on the nacelle by transferring substantially all of those forces directly from the nacelle to the aircraft and transferring substantially none of those forces to the engine.
		Various arrangements of the nacelle components which facilitate engine removal while avoiding the placement of nacelle component interfaces in highly stressed regions of the nacelle are also disclosed.
	www.delphion.com /details?pn10=US05524847 (245 words)

	TrueGrid CFD Nacelle Template
		After the geometry is oriented and grouped, a few parameters must be set to reflect gross bounds and element sizes for the mesh.
		Replace the numerical range 1:14 on line 41 with the surface numbers of all surfaces of the nacelle (outer ring) line 41: sd 101 sds 1:14; Replace the numerical range 15:17 on line 45 with the surface numbers of all surfaces of the spinner.
		This z-coordinate should be at least 20 units larger than the largest z-coordinate of any point of the geometry (30 or 40 is better) line 49: zmax 100 Specify a minimum z-coordinate for the problem.
	www.truegrid.com /nac1.html (569 words)

	Nacelle - Definition up Erdmond.Com (Site not responding. Last check: 2007-11-04)
		The nacelles rest in the down position for sublight travel and are raised up before jumping to warp.
		The reason for this has not been explained in the show, but the startrek.com website gives as an explanation that the arrangement "allows the starship to exceed the warp 5 "speed limit" without polluting the space continuum." (The warp 5 speed limit was set in the ' episode "Force of Nature".
		It is the framework forming the body of a dirigible balloon, and containing the machinery, passengers, etc. ---- Nacelle is an American motorcycling magazine.
	www.erdmond.com /Nacelle.html (216 words)

	VMS - C-130J Engine Nacelle
		The new J model has essentially the same shaped airframe as the H model with the exception of the nacelles.
		The existing CFD model of the C-130H nacelles needed to be updated to represent the J model.
		The entire survey was performed whilst the aircraft was undergoing routine maintenance inspection, and the measured data was then used by DSTO to generate the surface model of the new nacelle and accurately combine this data with the existing CFD model.
	www.metrology.com.au /vms_applications/c130j.html (213 words)

	Vought Products - Nacelle Products
		Vought's nacelle systems production encompasses Dallas' production of large, complex nacelles for the C-17 airlifter and the long-standing and innovative work in such areas as acoustics, composites and the use of high temperature materials.
		In addition to C-17 nacelles, Vought also produces complete nacelles systems and components for a number of other aircraft, including the Gulfstream G450 and G350 business jets.
		Vought produces nacelle components for the Boeing 747, 767 and 777 airplanes.
	www.voughtaircraft.com /ProdProg/ourproducts/nacelles.htm (205 words)

	Nacelle Landing Lights (Site not responding. Last check: 2007-11-04)
		The Nacelle Recognition lights are mounted in the engine nacelle's outboard of the spinner.
		The Nacelle Recognition lights eliminate that speed restriction during high-speed descents.
		The STC is approved for all flat nacelle 500 and 600 series Twin Commanders.
	www.aircenterinc.com /products_lights.php (117 words)

	AERADE
		It applies to smoothly contoured bodies with a tractor propeller at or near the nose or a pusher propeller at or near the tail and the propellers may be counter-rotating.
		It provides for the separate estimation of forces on the propeller and on the nacelle/wing/flap and requires a knowledge of the geometry and of the power-off lift and drag of the nacelle/wing/flap.
		There is a basic method, developed using simple momentum theory, which applies to flaps continuous across the slipstream, circular section nacelles of diameter equal to that of the spinner, and propellers that do not overlap.
	aerade.cranfield.ac.uk /subject-listing/esdu/ES70.html (857 words)

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