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Path: ...!npeer.as286.net!npeer-ng0.as286.net!weretis.net!feeder8.news.weretis.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: AMuzi <am@yellowjersey.org> Newsgroups: rec.bicycles.tech Subject: Re: Bicycle physics question Date: Fri, 21 Jun 2024 18:26:18 -0500 Organization: Yellow Jersey, Ltd. Lines: 91 Message-ID: <v5526o$3ckdd$3@dont-email.me> References: <v4qjk1$vle9$1@dont-email.me> <led37j9o09vdf8h1gsvuhnls0qg95me29k@4ax.com> <v4vmmb$25qk1$2@dont-email.me> <v4vu5i$27l91$1@dont-email.me> <v50rcg$1vi9i$1@dont-email.me> <v51h6m$2kh16$1@dont-email.me> <v51hps$2kmdm$1@dont-email.me> <v51t2j$2mqdt$1@dont-email.me> <3t1dO.67688$iz_6.61114@fx14.iad> <v52aau$2pa8q$1@dont-email.me> <v53gcs$33h30$1@dont-email.me> <inhdO.81790$eX68.21141@fx18.iad> <rEmdO.30024$ikOc.17742@fx10.ams4> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sat, 22 Jun 2024 01:26:17 +0200 (CEST) Injection-Info: dont-email.me; posting-host="0a0afc7107720ea61439e909e563d67d"; logging-data="3559853"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18mBwxVVRH2EwJ5KlyWsO/Z" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:4Wm4U14uNtleq19XhIYUHp2JDvI= In-Reply-To: <rEmdO.30024$ikOc.17742@fx10.ams4> Content-Language: en-US Bytes: 5303 On 6/21/2024 4:54 PM, Roger Merriman wrote: > Tom Kunich <cyclintom@yahoo.com> wrote: >> On Fri Jun 21 05:16:11 2024 zen cycle wrote: >>> On 6/20/2024 6:26 PM, AMuzi wrote: >>>> On 6/20/2024 4:48 PM, Tom Kunich wrote: >>>>> On Thu Jun 20 14:40:19 2024 Frank Krygowski wrote: >>>>>> On 6/20/2024 11:27 AM, AMuzi wrote: >>>>>>> On 6/20/2024 10:17 AM, Frank Krygowski wrote: >>>>>>>> >>>>>>>> If a cyclist were to repeatedly stand tall on the pedals, then crouch >>>>>>>> as low as possible, then stand back up, he would not experience >>>>>>>> accelerations and decelerations each time he did that. >>>>>>>> >>>>>>>> That case is easier to explain. The relevant vectors are perpendicular >>>>>>>> to each other. >>>>>>>> >>>>>>> >>>>>>> Speaking of different aspects, a full upright stand on a descent and >>>>>>> then folding into an aero position makes for a dramatic speed change. >>>>>> >>>>>> Of course. But that's entirely explained by aerodynamics. It's not >>>>>> related to changes in the rider's potential energy relative to the road >>>>>> surface. >>>>>> >>>>>> -- >>>>>> - Frank Krygowski >>>>>> >>>>> >>>>> >>>>> >>>>> >>>>> When you are riding a bike you are gaining and losing energy via the >>>>> motion of the CG of the bike in the depth of the gravity field. You >>>>> are also losing more energy in a turn from tire forces. Because the >>>>> depth of the gravity field is so deep and the change of the CG change >>>>> of the bike is so slight you can only talk about the gains and loses >>>>> theoretically. The loses from the tire shape into and out of a turn >>>>> are more significant. But under normal conditions those are so slight >>>>> that only racers can detect them because of the speed required to make >>>>> signficant scrubbing actions detectable. >>>>> >>>>> With a motorcycle it is easier to detect because of the much larger >>>>> speed differentials and the much wider tires with consequen5tial >>>>> inccrease in scrubbing energy. >>>> >>>> Gravity field? >>>> Is that like a corn field or more of a force field? >>> >>> no, the gravity field is what causes the tire sealant to stay at the >>> bottom of the tire when the bike is moving, causes dents to pop out of >>> bike tubes while riding the bike and renders aluminum oxide flammable. >>> Different laws of physics in tommyworld, dontchaknow.... >> >> >> >> >> Why do you continue to show that you haven't even a passing understanding >> of physics. Toyota is about to release a motor that runs on WATER. It >> separates the hydrogen fromn the oxygen and then recombines them for >> energy. I realize that with your very elementary understanding of physics >> that you will say that isn't possible but perhaps you can address that to >> Toyota, I won't even try to explain how you can get aluminum oxide to >> burn and create energy since you can't even explain how a wire length >> could be measure with a PWM signal. >> >> Your absolute ignirance is breaqqthtaking considering that you have a job >> as an engineer. Good thing that it isn't any more complex than signing >> off on the QC of a batch of devices. >> > >> > > You need to read the press releases their “water engine” is a electric > motor powered by a fuel cell ie they are still going down the Hydrogen > route which has been the bright future for well over a hundred years, now > see also the year of the Linux desktop or gearbox bikes! > > Roger Merriman > Well, probably possible in that throwing piles of money at problems can make them disappear like magic. People who work with hydrogen tell me it's a bitch to contain- seeps through everything; a container suitable to most compressed gases will still bleed hydrogen... -- Andrew Muzi am@yellowjersey.org Open every day since 1 April, 1971