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Topic: Power to weight ratio

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	Power-to-weight ratio
		Vehicle weights have relatively little impact on top speed, which is mostly dependant on aerodynamic drag, which is (roughly) proportional to the fourth power (square of the square) of the vehicle speed.
		In an aircraft, any additional weight requires more lift to be generated by the wings in order to lift it.
		In this usage the power-to-weight ratio is typically used to refer to the weight of the engine alone, as a useful way of comparing various aircraft engines.
	www.ebroadcast.com.au /lookup/encyclopedia/po/Power_loading.html (244 words)

	Power-to-weight ratio -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		Vehicle weights have relatively little impact on top speed, which is mostly dependent on aerodynamic (The phenomenon of resistance to motion through a fluid) drag (see (Click link for more info and facts about drag equation) drag equation).
		In this usage the power-to-weight ratio is typically used to refer to the weight of the engine alone, as a useful way of comparing various (The engine that powers and aircraft) aircraft engines.
		The term applying to the aircraft as a whole is power loading, and is used especially in (An aircraft without wings that obtains its lift from the rotation of overhead blades) helicopter engineering.
	www.absoluteastronomy.com /encyclopedia/P/Po/Power-to-weight_ratio.htm (280 words)

	Encyclopedia: Power-to-weight ratio (Site not responding. Last check: 2007-10-20)
		Power-to-weight ratio is a measure commonly used when comparing various vehicles (or engines), including automobiles, motorcycles and aircraft.
		It is, simply, the power the engine develops, divided by the vehicle's or (or engine) weight.
		Vehicle weights have relatively little impact on top speed, which is mostly dependent on aerodynamic drag (see drag equation).
	www.nationmaster.com /encyclopedia/Power_to_weight-ratio (308 words)

	Description of a very simple model to predict vehicle performance from power to weight ratio alone
		The equation shows that instantaneous acceleration is the power to weight ratio divided by the instantaneous speed.
		Alternatively, take your percentage change in power to weight ratio, divide by 3 and that will be the percentage change in 1/4 mile time.
		This means that over the 0-60mph increment cars with high power to weight ratios don't do as well as expected, whilst those with low power to weight ratios do better than expected.
	www.tomstickland.co.uk /astra/homework/simple_acc_model.htm (1554 words)

	power/weight ratio, gas vs. electric? : RC Universe! The Ultimate RC forum (Site not responding. Last check: 2007-10-20)
		Also, it would only be fair to include the weight of fuel vs. the weight of batteries in the chart...then comes the price of the different setups.
		Weight is 11.5 to 12 lbs on the glow models (same to more than my electrified one).
		Certainly if power, torque, run time, thrust etc were all equal one would prefer the setup with the lower weight but they never are all equal.
	utopia.rcuniverse.com /rcarchive/130/2003/04/1/144529 (1968 words)

	ESPN.com: OLY - Armstrong needs to attack
		To determine the ratio, we take a rider's maximum sustainable power and divide it by his weight in kilograms, giving us a value in watts per kilogram.
		Power-to-weight ratio matters most in the mountains, where riders have to use their power to overcome the effects of gravity.
		Ullrich produces a lot of power and can maintain a very high climbing pace, but he is a big man and struggles to accelerate in response to attacks.
	espn.go.com /oly/tdf2003/s/2003/0718/1582754.html (839 words)

	Best power to weight ratio, or more hp and tires? - Forza Motorsport Forums
		I've been finding that to get the best power to weight ratio you usually have to get pro weight reduction and settle for less hp to stay in a certain class..
		power to weight ratio is the way to go, but if the tire cannot stand it...
		Power upgrades is a good way to go when on longer tracks with a tyre upgrade if possible but not required.
	forums.forzamotorsport.net /forums/42/ShowPost.aspx (1478 words)

	Description of a very simple model to predict vehicle performance from power to weight ratio alone
		Power is calculated by multiplying the torque by the speed of the crank.
		The power output depends on two things: how much energy is released for each volume of air; and how much air is moved through the engine in a set time.
		So if the gear ratio is 2 and the final drive ratio is 4 then each rev from the engine will be divided by 2 and then divided by 4 to come up with 1/8th of a rev at the wheels.
	www.tomstickland.co.uk /astra/homework/hwork.htm (2622 words)

	GTP Forums - Power-to-weight ratio calculations?
		The power-to-weight ratio given in the showroom screen is the standard weight of the car divided by the true, broken-in power of the car.
		As it is, GT3's "Power-to-weight ratio" is incorrect, as that implies an amount of power per unit weight, the higher the better.
		PWR is measured in horsepower per tonne (or hp per ton, for Imperial types, or PS per tonne for metric types).
	www.gtplanet.net /forum/printthread.php?t=44320 (1928 words)

	Active.com - Going uphill fast with power (Site not responding. Last check: 2007-10-20)
		Power to weight ratio has two components: first, the ability to ride for long periods of time at a Maximum Sustainable (MS) power.
		This gave him an incredible power to weight ratio of 7 watts per kilogram (480 / 68 = 7).
		Indurain's much higher MS power gave him the advantage in the time trials, where the main obstacle is wind drag.
	www.active.com /story.cfm?story_id=11139&sidebar=21&category=cycling (551 words)

	Runner's & Triathlete's Web Cycling: Going Uphill Fast
		On short climbs being a typical pure climber (slight build with an excellent power / weight ratio) is not always an advantage over a heavier but more explosive rider with a very high MS power over short climbs.
		A top climber needs a high MS power in relation to body weight and needs to be able to ride at MS power over long periods of time, typically 30 minutes - 60 minutes.
		Increasing your power to weight ratio by reducing your body fat (for those of you who can loose a few extra pounds).
	www.runnersweb.com /running/news/rw_news_20050516_TSF_Climbing.html (1616 words)

	Lance Armstrong makes the Tour climbs look easy. Ever wonder how he does it?
		Maintaining an efficient power-to-weight ratio is a key concern for athletes during the mountain stages of the Tour de France.
		To determine your power-to-weight ratio, perform a 30-minute uphill time trial using a powermeter to monitor the watts you are able to generate on the bike.
		Power-to-weight ratio may play an even bigger role in events like Wildflower or Ironman Canada, where the hills on the bike course can be extremely demanding on the body.
	www.insidetri.com /train/tips/articles/1639.0.html (1004 words)

	www.ifish.net: Power to weight ratio with SJ and OJ motors....
		Power to weight ratio with SJ and OJ motors....
		So if power to weight ratio were equal (in general), I could go up to a boat that weighs another 250# and still maintain 'similar' performance.
		Re: Power to weight ratio with SJ and OJ motors....
	www.ifish.net /forum/showflat.php?Number=776196 (603 words)

	MATERIAL-HANDLING EQUIPMENT: Search High and Low
		With the heaviest component, the engine, on one side of the frame, additional weight is distributed to other areas of the machine to pass the American Society of Mechanical Engineers' B56.6 stability test.
		Its center-mounted engine maximizes the engine's weight, which is low in the center of the frame between the axles.
		The lower weight of the design means efficient fuel consumption and lower trucking costs.
	rermag.com /mag/equipment_materialhandling_equipment_search (546 words)

	CarStereos.org / SoundIllusions.net - Power to weight ratio Q's (Site not responding. Last check: 2007-10-20)
		The good thing about a car with little power, but good p/w ratio, not only do you have the acceleration of a larger car with the same p/w ratio, your usually way more nimble.
		Power to weight ratio is the most important factor in accelerating quickly.
		But the raw numbers are 13.78:1 power to weight ratio is about what my car sits at, and it's went a traction limited 13.3.
	www.soundillusions.net /Forum/printthread.php?t=32562&pp=40 (2304 words)

	Power To Weight Ratio (Site not responding. Last check: 2007-10-20)
		refers to the ratio of the horsepower as compared to the weight of a given vehicle.
		This, and a few other very important factors such as traction, power curve, and final drive ratio are directly related the the vehicle's acceleration ability.
		This is due to the fact that the rated 345 horsepower is only avalible within a limited RPM range, and the single 1:1 drive ratio would only allow a practical.5 P:WR over an approximate 15 - 20 MPH range of the bikes total speed potential.
	www.richmondlabs.com /Automotive/RichmondV8/PWR.html (158 words)

	1 (Site not responding. Last check: 2007-10-20)
		1, "Power to Weight Ratio" means how much power something has opposed to how much it weighs.
		1, Power to weight ratio is commonly used when comparing vehicles or engine and aircrafts.
		2, To improve the "power to weight ratio" we must reduce the weight of the car.
	intranet.footscray.vic.edu.au /solar_2004a/unnamed/Power.htm (101 words)

	NewBeetle.org Forums - Powr To Weight Ratio (Site not responding. Last check: 2007-10-20)
		Power to weight ratio is a very important aspect in the quest for speed.
		However it still is over weight when compared to a Lotus Elise that wieghs in at 1500-1800lbs depending on the market.
		A fix o flat guy at Costco said that using fix o flat will damage your tire, I don't remember if he was referring to extended usage of the damaged tire inflated with fix o flat or it had something to do with rotation forces (inflator causes tire to loose it's shape-roundness).
	forums.newbeetle.org /showthread.php?threadid=34910 (1274 words)

	Weight vs Capacity - Batteries Wholesale have all weight vs capacity power to weight ratio specifications reliable ...
		Weight vs Capacity - Batteries Wholesale have all weight vs capacity power to weight ratio specifications reliable technical information about standard and customized balance between capacity and weight.
		Capacity/weight ratio of highest power to weight batteries.
		The highest power to weight batteries are on the top and a handy guide is provided for the weight of 6, 7 and 8 cell packs made up of the corresponding batteries.
	www.batterieswholesale.com /capacity_weight.htm (331 words)

	Electric power to weight ratio - RC Groups
		So, my roughly weight estimation for your model should not be greater than 1.0 to 1.8 pounds dependig on the wing's airfoil and size.
		In level flight and at constant airspeed, lift is approximately equal to weight and thrust is approximately equal to drag.
		It is true that if you use inefficient cheap can motors you probably need a bit more power than the formula would suggest and if you use high quality brushless at around their optimum efficiency point you could get away with less.
	www.rcgroups.com /forums/showthread.php?t=242678 (1371 words)

	The Sport Factory - Atlanta's Coaching and Training Resource Off Season Training : TRAINING NEWS (Site not responding. Last check: 2007-10-20)
		Increase his power to weight ratio by either getting stronger, getting lighter, or both.
		Simply stated, the ability to move a lot of weight on the leg press can eventually be converted to the ability to apply more power to the pedals.
		Ultimately increases the amount of power that can be applied to the pedals, swim stroke, or running stride.
	speed-factory.com /offseasontraining.shtml (1085 words)

	Naval Technology - Rolls-Royce MT30 delivers a market leading power-to-weight ratio
		The Rolls-Royce MT30 delivers a market leading power-to-weight ratio and reduced operating and through-life costs.
		It has been selected by the US Navy to power the technology demonstrator for the DD(X) programme.
		This image is to illustrate the Rolls-Royce company profile.
	www.naval-technology.com /contractors/propulsion/rolls/rolls3.html (75 words)

	What is power to weight? (Site not responding. Last check: 2007-10-20)
		One of the Design Problems we all found was the “power to weight ratio”.
		Weigh your car and compare its weight to the car which moved best in the outdoor solar challenge last week.
		Write down what your team must do, if it is to improve your “power to weight ratio”.
	intranet.footscray.vic.edu.au /solar/power_to_weight.htm (105 words)

	RX8Club.com - Power-to-Weight Ratio Comparison (Site not responding. Last check: 2007-10-20)
		Power band is the RPM range for the engine where it is operating at or near peak torque.
		Ideally you want the power band to be as broad as possible, starting as low as possible.
		We should all be aware by now that lower gearing (higher ratio) will give you more torque but will lessen the top speed in gear.
	www.rx8club.com /showthread.php?t=8704 (1586 words)

	Club RSX Message Board - 12 second quarter mile traction & power to weight ratio
		Power to weight is generally less than one, but bigger numbers are easier to compare so weight to power is what is generally looked at, but still referred to as power to weight for some reason.
		First; I read somewhere that a power to weight ratio of 10 to 1 makes a 12 second car.
		It should actually be Weight to Power ratio.
	forums.clubrsx.com /showthread.php?t=68751 (916 words)

	Increasing Power to Weight ratio
		It's virtually always better to think about increasing the amount of power that you can produce, it's generally easier to increase power rather than loose mass, has added benefits (you'll be faster on the flat and uphill) and is more trainable.
		However, if you are looking at weight loss, then aim to loose no more than 0.5 kg per week, which is a kcal deficit of 500 kcal/day.
		Generally, the purpose of training is to increase power output.
	www.cyclingforums.com /showthread.php?t=16222 (303 words)

	Gear drives effect on power/weight ratio - RC Groups
		I'm curious as to the experiences any of you may have had with gear drives VS power to weight ratio.
		The power to weight ratio will not change but the gearing will allow more of the power to be used to moving the airplane.
		So, my new,though admittedly not very scientific, Rule of Thumb is that for a 3:1 gear ratio you may expect an approximate increase in power to weight of 1.5.
	www.rcgroups.com /forums/showthread.php?t=33126 (817 words)

	diyAudio Forums Archive - transformer power/weight ratio
		Does anybody know of a "rule of Thumb" for estimating the VA rating of transformers (non toroid) based on weight, I seem to recall having read of some issue like this somewhere.
		I Have some old trafo's I bought some 20 years ago in a surplus shop, they were advertised as being 50 V ct 50A but having seen some photos of some others on the net, I suspect they may not be so.
		I will need to weight them but of the top of my head they are rather heavy though not massively huge
	www.diyaudio.com /forums/showthread/t-49912.html (139 words)

	Major de Seversky Ionocraft - 07/07/01
		One possible power - boosting technique is to pulse the power in short high energy bursts rather than apply steady voltage.
		Concentrated beams of high-frequency radio waves may transfer energy from ground stations to the Ionocraft if the craft is to be used as a hovering platform in a fixed position.
		Power would be supplied by chain of ground-based master stations.
	www.keelynet.com /gravity/majorde.htm (2648 words)

	Camping World Open Roads Forum: Tow Vehicles: Power to weight ratio
		Power to weight has more to do with speed (acceleration) than towing.
		Sure, you need power to tow as well, but you need the basic foundation to make the whole package work......
		What I'm asking is: wouldn't a vehicle that is not TOO small (one that is of sufficient length and weight to tow a particular trailer) that has a larger engine be better than a TV that is much larger and heavier (i.e.
	www.campingworld.com /forums/index.cfm/fuseaction/thread/tid/12898410.cfm (921 words)

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