Difference between revisions of "Power to Weight"

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Clearly, by using Horsepower, we can obtain comparable units that mean something to us. This is about the only reason to use horsepower numbers.
 
Clearly, by using Horsepower, we can obtain comparable units that mean something to us. This is about the only reason to use horsepower numbers.
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[[category:motorcycle]]

Revision as of 02:03, 24 October 2006

Power to Weight Ratio: How much weight that the engine and gears has to push has a huge effect on your performance. For a given bike, the lighter the load, the quicker you can go and the gears can be taller. My '05 600RR weighs 422 lbs with a full tank of gas and no rider on board (50.5 %F, 49.5 %R), With me and gear on the bike, it weighs 635 lbs (46.4 %F, 53 %R). A different rider may bring that total weight down to 600 lbs, a 35 lb difference. this could be the difference of one tooth on the rear sprockets with the same accelleration and a higher top speed.

Lets use Horsepower to understand this: (550 Ft*Lb/Sec. = 745.7 Watt = 1 HP) Pete & 600RR - 635 Lb / 101.4 HP= 6.26 Lb / HP Light Rider & 600RR - 600 Lb / 101.4 HP = 5.92 Lb / HP or Pete & 600RR - 101.4 HP * 550 Ft*Lb/Sec. / 635 Lb = 87.82 Ft / Sec Light Rider & 600RR - 101.4 HP * 550 Ft*Lb/Sec. / 600 Lb = 92.95 Ft / Sec or Pete & 600RR - 101.4 HP * 745.7 Watt. / 635 Lb = 119.1 Watt / lb Light Rider & 600RR - 101.4 HP * 745 Watt. / 600 Lb = 126.0 Watt / lb

Lets use Torque to understand this:

Pete & 600RR - 41.8 Ft * Lb / 635 Lb = 0.66 Ft. Light Rider & 600RR - 41.8 Ft * Lb / 600 Lb = Ft.

Lets use Driving Thrust to understand this: (Peak, 2nd Gear)

Pete & 600RR - 519 Lb / 635 Lb =0 .817 Light Rider & 600RR - 519 Lb / 600 Lb =0 .865

Clearly, by using Horsepower, we can obtain comparable units that mean something to us. This is about the only reason to use horsepower numbers.