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GYXU > General > how much faster? 25 May 2005 08:05:56

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how much faster?
Musketman 24 May 2005 05:37:25
	This is a boring question but is a 24" tyre much faster than a 20" tyre? Cuz im sick of pedaling so fast and going nowhere! -- musketman ------------------------------------------------------------------------ musketman's Profile: http://www.unicyclist.com/profile/9214 View this thread: http://www.unicyclist.com/thread/40623
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E39m5 24 May 2005 06:02:14 [ permanent link ]
	well, what kind of riding do you do? If its for sheer distance purposes, you should probably look into a coker. e39m5 -- e39m5 ------------------------------------------------------------------------ e39m5's Profile: http://www.unicyclist.com/profile/9836 View this thread: http://www.unicyclist.com/thread/40623
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Gerblefranklin 24 May 2005 06:24:00 [ permanent link ]
	yeah, it's faster, but they're both slow as hell. Get a bike if you are actually thinking about practicality. -- gerblefranklin - Trials Unicyclist http://gallery.unicyclist.com/Trials-Muni Nick's main man. "The genesis of genocide is like a Pagan religion; carefully hidden, woven into the holidays of a Christian."-Immortal Technique ------------------------------------------------------------------------ gerblefranklin's Profile: http://www.unicyclist.com/profile/4295 View this thread: http://www.unicyclist.com/thread/40623
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Roadkill 24 May 2005 06:35:17 [ permanent link ]
	Musketman wrote: -"This is a boring question but is a 24" tyre much faster than a 20" tyre? Cuz im sick of pedaling so fast and going nowhere"- The simple answer is: Yes, a 24" is noticeably faster than a 20". But, whenever I'm pedaling a 24" it feels like the thing is going nowhere. Consider a 26" or even better, a 29" Unicycle. -- roadkill - Crash Test Dummy "Anyone who has never made a mistake has never tried anything new." - Albert Einstein ------------------------------------------------------------------------ roadkill's Profile: http://www.unicyclist.com/profile/9784 View this thread: http://www.unicyclist.com/thread/40623
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Gild 24 May 2005 12:28:45 [ permanent link ]
	say after me "'Constant Footspeed Hypothesis' (http://tinyurl.com/cmjmd)" say it 'again' (http://tinyurl.com/88n98) and 'again' (http://tinyurl.com/bqdqc) happy reading -- GILD - Waffle-Tosser, Time-bider and JCTK if you can't say anything good about someone, sit right here by me.-- 'alice' (http://www.timeanddate.com/worldclock/custom.html?) 'roosevelt' (http://tinyurl.com/963jr) 'longworth' (http://tinyurl.com/78ybd) [size=1] I feel like a fugitive from the law of averages.-- William H. Mauldin[/SIZE] ..using nietzsche's metaphysics to escape from christianity...-'metro_tramp on the value of metaphysics' (http://tinyurl.com/4sjw6)- it's hard to be sure, and good to be paranoid...john childs on life on the internet 'NAMASTE!' (http://tinyurl.com/4qcxw) 'Dave' (http://www.lyricsdir.com/d/deep-purple/child-in-time.php) ------------------------------------------------------------------------ GILD's Profile: http://www.unicyclist.com/profile/657 View this thread: http://www.unicyclist.com/thread/40623
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Unicyclist of Oz 24 May 2005 16:46:41 [ permanent link ]
	If I did my math right (I got up 45 minutes ago, which isn't long for me) if you pedal at the same rpm, a 24 inch goes 1.2 times as fast as a 20 inch. -- Unicyclist of Oz - Level 5 Unicyclist "-Hello. How are you? -No cucumber." --My dumb brother talking to a Subway employee ------------------------------------------------------------------------ Unicyclist of Oz's Profile: http://www.unicyclist.com/profile/9862 View this thread: http://www.unicyclist.com/thread/40623
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Mscalisi 24 May 2005 20:00:42 [ permanent link ]
	..in that case, get a motorcycle. gerblefranklin wrote:> yeah, it's faster, but they're both slow as hell. Get a bike if you> are actually thinking about practicality. -- mscalisi - Not such a newbie anymore ------------------------------------------------------------------------ mscalisi's Profile: http://www.unicyclist.com/profile/4961 View this thread: http://www.unicyclist.com/thread/40623
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Joemarshall 24 May 2005 20:50:40 [ permanent link ]
	Ken Cline wrote:> Unfortunately, this theory ignores the energy required of the> rider.> If reduce wheel size and crank size proportionally with that, you'll> quickly find you can't spin fast enough to keep up with the original> wheel. The reason is that your foot has to accelerate faster on the> smaller wheel, and that takes more energy.> As an alternative, I suggest considering a "constant foot> acceleration> hypothesis", where pedalling energy, rather than foot speed, is> maintained as a constant. If you do this, you find that the cranks> on> smaller unicycles need to be proportionally smaller than those on> larger wheels to maintain the same forward speed. This means you> have> proportionally less torque on the smaller wheel, which is> consequently> harder to control. If you keep cranks within a reasonable range> (which depends on rider skill), you'll find that bigger wheels go> faster.> It is a rule of thumb, no-one's suggesting it's anything more than that. However, lots of experienced riders of short cranks / big wheels seem to think it's a pretty good one. In my experience over thousands of miles on each, it works okay between a 29" and a 36" wheel until you get to very silly short cranks (<100mm) on the 29er where you're just so lacking in control that the bumps take you off. It's nice to calculate some super clever answer, but that's never going to be much use as a rule of thumb that you can just work out in your head. It still going to be inaccurate due to the many variables ignored by both methods, such as the different weight of the wheel relative to the foot / the moving parts of the body / the rider, the differing accelerations of various body parts and how that relates to the acceleration of the foot, ie. what percentage of the body weight you're accelerating is just going round in circles etc. Joe -- joemarshall - dumb blonde my pics http://gallery.unicyclist.com/album483 ------------------------------------------------------------------------ joemarshall's Profile: http://www.unicyclist.com/profile/1545 View this thread: http://www.unicyclist.com/thread/40623
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Ken Cline 25 May 2005 02:56:37 [ permanent link ]
	"joemarshall" <joemarshall@NoEmail.Message.Poster.at.Unicyclist.com> writes: It is a rule of thumb, no-one's suggesting it's anything more than that.> However, lots of experienced riders of short cranks / big wheels seem to> think it's a pretty good one. As a rule of thumb it is great. Changing crank length proportionally with wheel size makes sense since it yields equal force on thewheel when making control corrections. What doesn't make sense is pretending that pedal velocity is a primary factor in determining riding speed. It is not. The term "constant footspeed hypothesis" is misleading. Come up with a different name and I'll stop complaining. Ken
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John_childs 25 May 2005 03:14:40 [ permanent link ]
	Ken Cline wrote:> As an alternative, I suggest considering a "constant foot> acceleration> hypothesis", where pedalling energy, rather than foot speed, is> maintained as a constant. If you do this, you find that the cranks> on> smaller unicycles need to be proportionally smaller than those on> larger wheels to maintain the same forward speed. This means you> have> proportionally less torque on the smaller wheel, which is> consequently> harder to control. If you keep cranks within a reasonable range> (which depends on rider skill), you'll find that bigger wheels go> faster. Have you run any sample calculations for constant foot acceleration compared to constant foot speed? I'm too lazy to run the numbers right now and it has also been a long time since I've done any dynamics so I'm all rusty with the equations. I can see how acceleration is a better measurement than speed since your feet are moving in a fast circle. Anything moving around in a circle is accelerating even if it is moving at a constant speed. -- john_childs - Guinness Mojo john_childs (att) hotmail (dott) com Gallery: '' (http://www.unicyclist.com/gallery/john_childs) ' Unicycling Bookmark List' (http://backcountry.unicyclist.com/) :: 'World Clock' (http://tinyurl.com/a99y3) >>>'Click Me' (http://tinyurl.com/963jr)<<< ------------------------------------------------------------------------ john_childs's Profile: http://www.unicyclist.com/profile/449 View this thread: http://www.unicyclist.com/thread/40623
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Corbin 25 May 2005 03:21:59 [ permanent link ]
	mscalisi wrote:> ...in that case, get a motorcycle. ..with a 1000cc engine. Anything smaller than that is just too slow! -- corbin - Treehouse Muni Rider http://www.corbinstreehouse.com ------------------------------------------------------------------------ corbin's Profile: http://www.unicyclist.com/profile/7561 View this thread: http://www.unicyclist.com/thread/40623
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Munipsycho 25 May 2005 07:21:28 [ permanent link ]
	GILD wrote:> say after me "'Constant Footspeed Hypothesis'> (http://tinyurl.com/cmjmd)"> say it 'again' (http://tinyurl.com/88n98) and 'again'> (http://tinyurl.com/bqdqc) > happy reading Thanks GILD. These are great posts. Lots of fun to read. -- munipsycho - CrashTestDummies are us. ===================== 'Victory belongs now to this small tree.' (http://munipsycho.com/stories/a_little_tree.jsp) 'The UniSkills Assessment' (http://www.munipsycho.com/uniskills_2.jsp) I can fly too. But I can only fly down. -Little Bear Imagine all the people Riding on one wheel. J. Lennon. (paraphrased) ------------------------------------------------------------------------ munipsycho's Profile: http://www.unicyclist.com/profile/9589 View this thread: http://www.unicyclist.com/thread/40623
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U-Turn 25 May 2005 08:05:56 [ permanent link ]
	To be meaningful, I think you'd have to take into account leg mass, which is different for the different sections of the leg. Shorter cranks use much more movement of the lower, less massy sections of the leg than longer cranks. And mules are even massier! So the mire gets deeper... -- U-Turn - As long as my feet keep movin'... Weep in the dojo... laugh on the battlefield. 'LiveWire Unicycles' (http://www.livewireunicycles.com) 'Strongest Coker Wheel in the World' (http://www.unicyclist.com/gallery/albup39) '29er Tire Study' (http://u-turn.unicyclist.com/29erTireStudy/) 'New York Unicycle Club' (http://www.newyorkunicycle.com) -- Dave Stockton ------------------------------------------------------------------------ U-Turn's Profile: http://www.unicyclist.com/profile/691 View this thread: http://www.unicyclist.com/thread/40623
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GYXU > General > how much faster? 25 May 2005 08:05:56

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