The Electric Car
in [Design]
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From: Ren� on 3 Aug 2007 14:55 On Fri, 03 Aug 2007 03:32:34 +0100, Eeyore <rabbitsfriendsandrelations(a)hotmail.com> wrote: >Flywheels are very impractical energy stores. The gyroscopic forces don't >exactly help in vehicle use either. Counter-rotating flywheels have no net gyroscope effect. Changing the differential between the flywheels can create a "wanted" cornering force. (attitude control in satellites is usually done that way) ...Perhaps a way to develop something useful out of those bling-bling wheelhub spinners.. -- - Ren�
From: Spehro Pefhany on 3 Aug 2007 15:03 On Fri, 03 Aug 2007 20:55:38 +0200, Ren� <rjz~REMOVE~@xs4all.nl> wrote: >On Fri, 03 Aug 2007 03:32:34 +0100, Eeyore ><rabbitsfriendsandrelations(a)hotmail.com> wrote: > >>Flywheels are very impractical energy stores. The gyroscopic forces don't >>exactly help in vehicle use either. > >Counter-rotating flywheels have no net gyroscope effect. No matter the distance betwen the flywheels? >Changing the differential between the flywheels can create a "wanted" >cornering force. (attitude control in satellites is usually done that >way) Just changing the angular velocity creates a torque for the ACS. >..Perhaps a way to develop something useful out of those bling-bling >wheelhub spinners.. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
From: Mark on 3 Aug 2007 15:34 > > >>Flywheels are very impractical energy stores. The gyroscopic forces don't > >>exactly help in vehicle use either. > > >Counter-rotating flywheels have no net gyroscope effect. > > No matter the distance betwen the flywheels? > > >Changing the differential between the flywheels can create a "wanted" > >cornering force. (attitude control in satellites is usually done that > >way) > > Just changing the angular velocity creates a torque for the ACS. > My point about bringing up the flywheels, is that the electric parts of the Prius are there just for temporary storage of a relativley small amount of energy i.e. for regen braking and to boost acceleration. The batteries do not supply much long term energy for cruise, that all comes from the ICE Mark Mark
From: Ren� on 4 Aug 2007 07:07 On Fri, 03 Aug 2007 14:16:22 +0100, Eeyore <rabbitsfriendsandrelations(a)hotmail.com> wrote: >> > Exactly why do you think car's *aren't* fitted with skinny tyres ? >> >> Because people will buy them. > >So why don't F1 cars have skinny tyres ? Ground effect anything to do with that? - more than the weight of the car itself usually.. -- - Ren�
From: MooseFET on 4 Aug 2007 10:49
On Aug 3, 8:02 am, Eeyore <rabbitsfriendsandrelati...(a)hotmail.com> wrote: > MooseFET wrote: > > Eeyore wrote: > > > MooseFET wrote: > > > > Eeyore wrote: > > > > > > Exactly why do you think car's *aren't* fitted with skinny tyres ? > > > > > Because people will buy them. > > > > So why don't F1 cars have skinny tyres ? > > > They use very sticky tires, their tires get a lot of heating and they > > make a lot of horse power per pound. All of these can cause the > > rubber to break up. No sane persons tires will see those conditions > > on the public roads. > > So why don't F1 cars have skinny tyres ? I explained it but I guess you just didn't understand something so I will break it down into steps to see where you didn't follow: Are you aware of just how much faster they are going? Do you understand that they get their tires very hot? Have you forgotten that we were talking about the tires on a car being driven on public roads? Are you aware that rubber gets weaker at high temperatures? Did you understand that the point where the rubber starts to rip apart makes a limit on the usefulness of the tire? |