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From: atec77 on 6 Feb 2007 06:40 Mad-Biker wrote: > so can i put my 25cc 2 stroke whipper snipper motor on a pully system to > turn over an alternator? > > home made mini gen :-) yes , its ok and will charge a battery when the whirleewhirlee breaks the mains supply > > > > > "Knobdoodle" <knobdoodle(a)hotmail.com> wrote in message > news:6NWxh.3546$sd2.1297(a)news-server.bigpond.net.au... >> "G-S" <geoff(a)castbus.com.au> wrote in message >> news:12sgae8aasvp9dc(a)corp.supernews.com... >>> Knobdoodle wrote: >>>> Car alternators and older large-bike alternators use a brush to power >>>> the electromagnetic rotor. >>> This is the 'standard' type of common alternator. >>> >>>> The more power into the rotor, the stronger the magnetism and therefore >>>> the more power out. The downside is that they're more expensive to >>>> manufacture and the brush wears out. >>> Brushes are easy (and cheap) to change. >>> >> Not if you're paying your local bikeshop to do the work!! >>>> The new ones use permanent magnets so they run flat-out all the time. >>>> The downside is they take more energy from the engine and turn all the >>>> unneeded output into heat. >>>> >>> Very sucky design too. >>> >> Yeah it offends me also but just like points ignition it's a thing of the >> past now. >> We've traded "runs forever with just a regular adjustment/replacement" for >> "runs faultlessly for 3000 hours then fails irretrievably"... >> Oh well..... >> -- >> Clem >> >> > >
From: Knobdoodle on 6 Feb 2007 07:45 "Mad-Biker" <mad-biker(a)westnet(Panties).com.au> wrote in message news:45c8540e$0$24091$61c65585(a)un-2park-reader-01.sydney.pipenetworks.com.au... > so can i put my 25cc 2 stroke whipper snipper motor on a pully system to > turn over an alternator? > > home made mini gen :-) > Yeah but you can't create power so you can only ever get nearly the output of the input. Say you're burning 1000 watts energy in your internal combustion engine you're maybe creating 500 watts of output power and 500 watts of heat and noise. The alternator then takes the 500 watts of energy and turns that into 200 watts of electrical power and the rest is turned into heat and (perhaps) light. So yes; your 25cc whippersnipper could probably run a 150 candle-power lightbulb or similar. -- Clem (And make you warm)
From: Knobdoodle on 6 Feb 2007 07:46 "Nev.." <idiot(a)mindless.com> wrote in message news:45c85708$0$25320$5a62ac22(a)per-qv1-newsreader-01.iinet.net.au... > Mad-Biker wrote: >> I never heard of it before, although i did get dirt stuck into a tyre >> valve which deflated it during a rally once. >> >> this is something i got told im going to have to check in my upcoming >> silver driver aka highspeed pursuit licence. > > That'll let you upgrade from the diesel Rodeo to the petrol model? > Holy mother of god; get the women and children off the street!! -- Clem
From: Knobdoodle on 6 Feb 2007 07:48 "Dale Porter" <daleaporter(a)gmail.com> wrote in message news:eq9ihp$ei8$1(a)otis.netspace.net.au... > "Knobdoodle" <knobdoodle(a)hotmail.com> wrote >>> However Nev has oversimplified. >>> >>> An alternator will only produce the required amount of amps needed to >>> run the operating electrical systems in the car (charging, lights, >>> stereo, heater/air-con fan, etc) up to the output capacity of the >>> alternator. As the amp demand increases, so does the load on the >>> alternator, which in turn puts an added load on the engine running the >>> alternator. >>> >>> So yes the battery will stay charged provided the power demands of the >>> alternator are not exceeded, but that does not mean there is constant >>> load on the alternator up to it's production limit. >>> >> In a car yes; but I think Nev was talking about the horrible >> constant-output (dependent on revs) setups that bikes have these days. >> -- >> > > Do Superbudgies come with radios these days? > Hmmm [rechecks thread].... YES. Air-con too! -- Clem [sound of head being pulled in]
From: Knobdoodle on 6 Feb 2007 07:50
"Boxer" <someone(a)nowhere.com> wrote: > "Knobdoodle" <knobdoodle(a)hotmail.com> wrote: >> OK; I can accept the logic of centrifugal force causing the centre of the >> valve to pull down (towards the outside of the tyre) at high speed and >> letting the tyre deflate. (Sorry Nathan; I didn't understand the equation >> and sorry Theo; I didn't understand the explanation.) > > So that's why the front end of your GS let go! > I should've known 45kph was pushing into "Totally Ludicrous Speed"! -- Clem |