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Topic: Glide ratio

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	Re: avian flight - glide ratio
		It is the ratio of lift to drag -- which is also the ratio of horizontal travel to vertical descent and of airspeed to descent rate.
		Glide ratio is also a measure of the amount of power required to maintain level flight.
		Soaring is an extension of gliding in which the energy required to maintain level flight is extracted from one of several sources of energy often available in the atmosphere.
	dml.cmnh.org /2001Jan/msg00441.html (370 words)

	Glide ratio - Wikipedia, the free encyclopedia
		Glide ratio is an aviation term that refers to the distance an aircraft will move forward for any given amount of lost altitude (the cotangent of the downward angle).
		Glide ratio is the preferred term for unpowered aircraft, and lift-to-drag ratio the preferred term for aerodynamics literature and powered flight.
		Although the best glide ratio is important when measuring the performance of a glider, its ability to achieve a good glide ratio at high speed determines its success when racing (see article on gliding).
	en.wikipedia.org /wiki/Glide_ratio (397 words)

	Chair Glide -- Recommendations and Resources
		Properly, the term ''gliding'' refers to descending flight of a heavier-than-air craft when gravity (its own weight) is its sole motive force; ''soaring'' is the correct term to use when the craft gains altitude or speed from movements of the atmosphere during the flight.
		Gliding is prominent in cyanobacteria, myxobacteria and the cytophaga-flavobacteria.
		A glide bomb is an aerial bomb that is modified with aerodynamic surfaces to modify its flight path from a purely ballistic one, to a flatter, gliding, one.
	www.becomingapediatrician.com /health/29/chair-glide.html (2023 words)

	Glide ratio Info - Bored Net - Boredom (Site not responding. Last check: 2007-09-19)
		A modern sailplane may have a glide ratio as high as 40:1, with fabric hang gliders averaging about 10:1 and airliners about 25:1.
		The glide ratio of an aircraft is often strongly correlated to the efficiency of the wing, known as the lift-to-drag ratio.
		Overall drag is also important, for instance a cargo plane will typically have a lower glide ratio than a passenger plane, but in generally these differences are a smaller effect than the wing itself.
	www.borednet.com /e/n/encyclopedia/g/gl/glide_ratio.html (238 words)

	Aviation Glide Ratio Index Calculator
		(Obviously, gliding into a headwind will reduce the estimated distance of travel; and gliding with a tailwind will increase the distance.) A second is that the point on the ground (the ground level altitude), ABOVE which a glide begins, and the targeted landing area are the same altitude.
		Critical assumptions are that the glide ratio is maintained at a constant rate, there are no thermals or down drafts and that all factors remain constant (along with many others...).
		(A glide ratio of 20:1 might be appropriate for an Eagle riding the wind while a 1:14 ratio is similar to the glide capability of a brick.) Enter the altitude AGL that the glide condition begins.
	www.csgnetwork.com /glideratiocalc.html (503 words)

	Lift-to-drag ratio - Wikipedia, the free encyclopedia
		In aerodynamics, the lift-to-drag ratio, or L/D ratio ("ell-over-dee", as opposed to "ell-dee"), is the amount of lift generated by a wing, compared to the drag it creates by moving through the air.
		A "better" L/D ratio is one of the major goals in wing design, since a particular aircraft's needed lift doesn't change, delivering that lift with lower drag leads directly to better fuel economy, climb performance and glide ratio.
		Like all things in aeronautical engineering, the lift-to-drag ratio is not the only consideration for wing design.
	en.wikipedia.org /wiki/Lift-to-drag_ratio (514 words)

	Dropzone.com Skydive Forums: Skydiving: General Skydiving Discussions: Tracking : True or false?
		At the atrocious glide angles attained by skydiving canopies and worse, by human beans, this is no longer the case - you have to work with the actual distance covered horizontally and the sink rate.
		Glide ratio is determined by the lift/drag ratio, not the surface area.
		In Reply To Glide ratio is determined by the lift/drag ratio, not the surface area.
	www.dropzone.com /cgi-bin/forum/gforum.cgi?post=1076847 (2260 words)

	glideratio (Site not responding. Last check: 2007-09-19)
		A paper airplane falls down due to gravity and glides forward through the air at the same time.
		We'll measure the glide ratio the ratio of the distance glided to the distance fallen.
		Trim it until it glides in a straight line smoothly to the floor.
	www.exo.net /~pauld/activities/flying/glideratio.html (345 words)

	Glider Performance Airspeeds
		The red glider has a better glide ratio, relative to the ground, than the yellow one even though the yellow glider has a better glide ratio relative to the air mass.
		To illustrate the similarity we assume a climb rate of 3 kts and see that the graph is identical to the one with 3 kts sink except for the labels.
		This is the reason for carrying ballast to improve glide performance when the thermals are strong enough, even though the climb rate suffers.
	home.att.net /~jdburch/polar.htm (2386 words)

	BASE-Jumping Forums - Glide Ratio
		Glide ratio for an aircraft, for a canopy, for a paraglider, etc., is by definition "the best flight capability of that particular wing" which depends only by its geometry (which consequently affects its aerodynamc properties) and is a unique number.
		To summarize: "Glide ratio" is a geometrical/aerodynamical property for each wing such as you can reach the maximum horizontal distance possibile for that wing ONLY IF you fly that wing in the best possible conditions (stated by manufacturer).
		I think that the usefullness of glide ratio of your canopy, that you would prefer to be as much "accurate" as possible, is to give you an idea if in a "no wind" condition, you can make it to the landing with a good safety margin, or not.
	www.blincmagazine.com /forum/showthread.php?t=19140 (3356 words)

	GLIDE-SLIDE
		Because these ratios are plotted for different MacCready numbers, they DO take into consideration the performance of a 1-26 flown at the appropriate "MacCready Speed" as would be indicted by a speed ring or speed-to-fly indicator (either electric or pneumatic).
		In the problems to be solved, the Glide Ratio settings on the two pieces of equipment are adjusted to match each other, or else one piece of equipment is used to find the Glide Ratio setting for the other piece.
		The Table of Glide Ratios for a 1-26 is given here, so that part is easy--just print it, laminate it, and put it in your glider where you can see it without having to hunt for it.
	www.126association.org /glideslide.htm (2165 words)

	Howstuffworks "How Gliders Work"
		A plane's lift, drag and glide ratio characteristics are governed solely by its construction, and are predetermined at takeoff.
		The glide ratio is not affected by weight because while a heavier glider will sink faster, it will do so at a higher airspeed.
		If the glide ratio were the only factor involved, gliders would not be able to stay in the air nearly as long as they do.
	travel.howstuffworks.com /glider3.htm (1078 words)

	[No title]
		Since sailplanes of 22-meter span and a gliding ratio (L/D) of about 50 are flying already, the question arises as to what further advances are possible in the future.
		Whereas extremely high aspect ratios could not be realized in the past due to structural requirements, there are no problems of this kind in modern glass-fiber construction.
		Consequently, on Standard Class sailplanes, the airfoil drag coefficient at a certain aspect ratio increases to a greater extent as the induced drag coefficient is decreasing.
	www.betsybyars.com /guy/soaring_symposia/71-desig.html (1808 words)

	flytec 4030 GPS Access
		When the final glide function is active the 4030 will also display the nominal glide ratio to goal and if you are above or below glide angle to goal.
		During final glide, the 4030 will display your actual glide ratio, glide ratio to goal, as well as the anticipated arrival height over goal.
		The comparison between the actual glide ratio and the nominal glide ratio is also displayed.
	flightability.bizland.com /page8.htm (441 words)

	x-c
		Glide Ratio is not a number taken from an operating manual or factory specs, or the flight manual..
		True Glide Ratio is a combination of the factory glide ratio, adjusted for physical changes to the ship, and consideration of headwind or tailwind component, and the vertical motion of the air, all in combo with the level of proficiency of the soaring skills of the pilot.
		You may not always be within the direct glide ratio distance of a specific landing field, but you should normally always be within gliding distance of a safe area.
	www.sonic.net /~pjkelly/tsxc.html (830 words)

	Landing
		To correct for this, the pilot must steepen the glide path until the aiming point becomes stationary on the canopy or no longer appears to be moving toward the glider.
		To correct for this, the pilot must shallow the glide path until the aiming point becomes stationary on the canopy or no longer appears to be moving away from the glider.
		From the pilot's perspective the only difference between a side slip to correct for a crosswind and a forward slip to steepen the glide path is that the nose of the glider is not aligned with the runway in the forward slip.
	home.att.net /~jdburch/landing.htm (2274 words)

	The Oz Report hang gliding news - 2.019 '98 (Site not responding. Last check: 2007-09-19)
		When the final glide computer is active the 4030 will display, in the upper display window, the actual glide to goal (up to 199:1).
		Now, if your actual glide over the ground is greater than the glide to goal the actual glide ratio will appear with the up arrow icon only to indicate that under present conditions glide to goal is conceivable.
		If your glide over the ground is less than the glide to goal the actual glide ratio will be displayed with the down arrow icon to indicate glide to goal is not possible.
	ozreport.com /2.19 (1399 words)

	Blohm & Voss BV 246 Glide Bomb Luft '46 Entry
		The glide ratio on the BV 246 was approximately 1:25, thus if the BV 246 was dropped from an altitude of 7000 meters (23100 feet), the "Hagelkorn" could glide as far as 175 kilometers (109 miles).
		The glide bomb was originally meant to be guided by a radio link from the carrier aircraft, but interest waned as the British began successfully countering German radio navigational aids.
		Ten of the modified BV 246 "Radieschen" equipped glide bombs were tested on the Unterlüss test range, but due to the new equipment being under development, eight of the tests failed, although two of the tests were successful, landing within two meters (6 feet) of the target.
	www.luft46.com /missile/bv246.html (517 words)

	Glide Angle
		The ratio of the change in altitude h to the change in distance d is often called the glide ratio.
		Notice that if the glide angle is small, the tan(a) is a small number, and the aircraft can fly a long distance for a small change in altitude.
		On another page, we will show that the glide angle is inversely related to the lift to drag ratio.
	www.grc.nasa.gov /WWW/K-12/airplane/glidang.html (356 words)

	GPS Measurement of Aircraft Glide Ratio
		The final values for the glide ratio of N6360D at IAS Vg = 65 KTS are determined by dividing TAS by GPS FPM (averaged descent rates), and summarized in Conclusions Table 4.
		For each leg of a glide box it’s important to stabilize the aircraft at the same IAS and new heading after each turn before recording the starting altitude and time.
		Final values for the glide ratio of N4975F at various altitudes for IAS Vg = 62 KTS are determined by dividing TAS by FPM descent rate, and summarized in Conclusions Table 5.
	www.scottkurowski.com /flying/GPSGlideRatio.html (1493 words)

	Glide Angle
		The ratio of the change in altitude h to the change in distance d is often called the glide ratio.
		Notice that if the glide angle is small, the tan(a) is a small number, and the aircraft can fly a long distance for a small change in altitude.
		On another page, we will show that the glide angle is inversely related to the lift to drag ratio.
	www.lerc.nasa.gov /WWW/K-12/airplane/glidang.html (357 words)

	Wills Wing Drogue Chute
		The drogue reduces glide ratio noticeably even at slow speeds, but the affect is much greater at higher speeds.
		In effect, the drogue gives a high performance glider the glide ratio performance envelope of a much lower performance glider, and as a result, makes many aspects of landing much easier.
		Second, the steeper glide path the drogue provides makes it much easier to set up an accurate approach to the target, because the same error in altitude results in a smaller error in distance traveled.
	www.willswing.com /Accessories/drogue.asp (898 words)

	Re: [GBSCstudents] Water ballast (Site not responding. Last check: 2007-09-19)
		A glider and pilot may have a best glide ratio of 40:1 (for instance) at 50 knots.
		If a 750 pound plane and pilot gets its best glide ratio of 40:1 at 50kts, adding 400 pounds water changes the weight to 1150, and so the new best glide speed is sqrt(1150/750) times 50 = 61.9kts.
		When conditions are weaker and the thermals are farther apart, you reduce speed in order to improve your glide ratio - giving you a higher probability of reaching the next thermal.
	home.comcast.net /~verhulst/GBSC/student/ballast.html (582 words)

	L/D Ratio and Glide Performance
		The higher the aspect ratio the greater the angle of attack the aircraft must fly at in order to be efficient.
		It is important to remember that small angles of attack correspond to high indicated airspeeds (relatively speaking) Large angles of attack correspond to relatively slower speeds.
		However, it is also true that the aircraft should be operated at a different speed (and angle of attack) when gliding in a wind.
	selair.selkirk.bc.ca /aerodynamics1/Performance/Page3.html (1347 words)

	::Aero-Experiments:: (Site not responding. Last check: 2007-09-19)
		In moderately smooth air the "current glide ratio" display on the Etrex Vista or GPSMap 76S is useful for comparing to the "glide ratio to target" display and judging whether or not the goal is currently in reach, and is also somewhat useful for fine-tuning the pilot's choice of speed-to-fly.
		In rough air the "current glide ratio" display on the Etrex Vista or GPSMap 76S is twitchy enough that it is only marginally useful for comparing to the "glide ratio to target" display, and is almost impossible to use for fine-tuning the pilot's choice of speed-to-fly.
		With any pressure-sensor-equipped GPS unit or GPS-compatible variometer the "glide ratio to target" display is intrinsically much more stable than the "current glide ratio" display, because the "glide ratio to target" display depends only on the glider's position in space relative to the target, not on the glider's horizontal and vertical velocities.
	www.aeroexperiments.org /GPS.shtml (2206 words)

	nature (Site not responding. Last check: 2007-09-19)
		As shown in the diagram, soaring land birds perform with the same high glide ratio as their cousins of the sea, who feature wings with very high aspect ratios.
		The african vulture "gyps rupelli" has finger-feathers (aspect ratio of about 8) and a glide ratio (i.e.
		L/D) of about 20, which is astonishly high compared to the albatros with a aspect ratio of 20 and a glide ratio of about 25.
	www.winggrid.ch /Whatisit.html (193 words)

	Maximize Glide Performance (Site not responding. Last check: 2007-09-19)
		Flying at the Pilot’s Operating Handbook (POH) maximum glide speed of 65 knots, a forced landing on the Taos golf course is imminent.
		Glide ratio is determined by dividing the distance covered at a particular airspeed by the rate of descent over a one-minute period.
		Another reason the glide ratio differed from the POH is the airplane wasn’t at maximum gross weight.
	www.swaviator.com /html/issueAM00/basicsAM00.html (1000 words)

	Gimli Glider Boeing 767 Gimli metric solder Ontario cockpit glass cockpit nautical mile glide ratio tire (Site not responding. Last check: 2007-09-19)
		Pearson glided the plane at 220 knots, his best guess as to the optimum airspeed.
		Copilot Maurice Quintal began making calculations to see if they'd reach Winnipeg, using the altitude from one of the mechanical backup instruments and distance travelled supplied by the air traffic controllers in Winnipeg by measuring the distance the plane's echo moved on their radar screens.
		The plane had lost 5,000 ft in ten nautical miles (18.5 km), giving a glide ratio of approximately 11:1 (which is actually quite good).
	en.powerwissen.com /R5JqauNwu1mHB7UuxQjr4A%3D%3D_Gimli_Glider.html (1295 words)

	First Flight - RC Groups
		These are estimates, but that works out to a glide ratio of 10:1.
		The lift to drag ratio of the whole plane is the lift divided by the sum of all three types of drag.
		When the plane is trimmed to fly at its maximum lift to drag ratio, the induced drag is exactly half of the total drag.
	www.rcgroups.com /forums/showthread.php?t=227539 (943 words)

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