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Re: [Spridgets] Bentley-RR Trivia: was calculating speed

 To: Spridget List Re: [Spridgets] Bentley-RR Trivia: was calculating speed Lester Tue, 21 Oct 2008 15:40:41 -0500
 ```hmm.. lemme correct a few typos.. On Oct 21, 2008, at 1:58 PM, Lester wrote: > Maybe this is a matter of semantics... > > True, the motorcycle "absolute top speed", for lack of a better > term, is limited by drag and HP. > > However, for a motorcycle with a top speed limited by gearing or > limited by engine revs then a larger diameter tire will allow for a > higher top speed ALTHOUGH this top speed may not be the "absolute > top speed" limited by drag. > > For example a 20 hp bike motor that will turn 6000 revs (and > pretending that the tranny is direct drive) will turn the tires > 6000 revs. > If those are 10 inch circumference tires then the bike will go > speed x,(no, I'm not going to calculate it out.) but if you replace > those tires with 20 inch circumference tires then the bike will go > twice as fast *** IF *** the bike has not reached is theoretical > drag-limited top speed and that the engine can turn the 20 inch > circumference tires at 6000 revs. > > > Lester > > On Oct 21, 2008, at 1:06 PM, Weslake1330@aol.com wrote: > >> Not so. >> >> Top speed is limited by aerodynamic drag and BHP. To go faster >> you need >> less drag or more bhp or both. >> >> Acceleration on the other hand is limited by lb/f torque to weight >> ratio (to >> the point where the drag is greater than bhp and limits top speed and >> therein acceleration). >> >> The motorcycle has less drag than a car (less frontal area really) >> so needs >> less bhp to reach its maximum speed. The wheel diameter is >> neither here nor >> their because the gearing controls the gearing and the wheel >> diameter is just >> one factor. >> >> W e s l a k e 1330 >> >> In a message dated 21/10/2008 18:15:47 GMT Daylight Time, >> bmwwxman@gmail.com >> writes: >> >> Fact >> is, BHP or HP by any measure really has nothing to do with speed. >> Only in >> elapsed time to reach a given speed. I have seen a 20 HP >> motorcycle reach >> 110 mph because of its wheel diameter and gearing. Likewise, I >> have seen 200 >> HP V-8s that couldn't hit 90 MPH. >> >> Cheers!! >> Jim >> _______________________________________________ >> Support Team.Net http://www.team.net/donate.html >> >> You are subscribed as oldsaabguy@comcast.net >> >> http://www.team.net/archive >> >> http://autox.team.net/mailman/listinfo/spridgets > _______________________________________________ > Support Team.Net http://www.team.net/donate.html > > You are subscribed as oldsaabguy@comcast.net > > http://www.team.net/archive > > http://autox.team.net/mailman/listinfo/spridgets _______________________________________________ Support Team.Net http://www.team.net/donate.html http://www.team.net/archive http://autox.team.net/mailman/listinfo/spridgets ```
 Current Thread [Spridgets] Bentley-RR Trivia: was calculating speed, Kitterer Bob Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Jim Johnson Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Weslake1330 Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Lester Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Weslake1330 Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Lester <= Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Ron Soave Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Kitterer Bob Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Hal Faulkner Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Billy Zoom Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Billy Zoom Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Lester Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Lester Re: [Spridgets] Bentley-RR Trivia: was calculating speed, Kitterer Bob