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"Chambers" <ben### [at] pacificwebguy com> wrote in message
news:46de0bbd@news.povray.org...
> Dre wrote:
>> No it doesn't!
>>
>> What kind of engine do you run in your car??? a nitro engine???
>>
>> Any car engine is capable of idling far below 1000rpm. Most idle aroun
>> 600-800rpm depending on auto or manual gearbox...
>
> I've seen several engines that idle at more than 1000rpm. I even saw one
> go as high as 1 800 (though I'm pretty sure there was something wrong with
> it).
>
> --
> ...Ben Chambers
> www.pacificwebguy.com
Well car engines tend to idle higher when they are cold as the ecu tells
them to (engines dont like being cold). An engine at operating temp
shouldn't need to idle above 1000rpm, thats just a waste of fuel.
1800rpm is way too high for idle and as you say, there was something wrong
with it.
I was just pointing out to Orchid that his engine *doesn't* idle at
*several* thousand rpm, thats a gross exaggeration.
Cheers Dre
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"Sabrina Kilian" <"ykgp at vtSPAM.edu"> wrote in message
news:46de1a62$1@news.povray.org...
> Chambers wrote:
>> Dre wrote:
>>> No it doesn't!
>>>
>>> What kind of engine do you run in your car??? a nitro engine???
>>>
>>> Any car engine is capable of idling far below 1000rpm. Most idle
>>> aroun 600-800rpm depending on auto or manual gearbox...
>>
>> I've seen several engines that idle at more than 1000rpm. I even saw
>> one go as high as 1 800 (though I'm pretty sure there was something
>> wrong with it).
>>
>
> My 4 stroke, 49.9 cc moped engine idles at 1800 to 2200. That is, if the
> manual is to be trusted, since in all three places it lists an ideal
> idle speed it has a different number. But, there is a difference between
> cars, and chainsaw motors with wheels.
Exactly, my model nitro engines need idle (2.5cc) idle around 2000-3000rpm
otherwise they stall, but they are a little different to a car engine, size
and rotating mass tend to have a lot to do with that :)
Cheers Dre
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On Tue, 04 Sep 2007 19:22:04 -0700, Darren New wrote:
> Orchid XP v3 wrote:
>> AFAIK, the retina sees the "integral" of incident light over time,
>
> Errr, not even close. Indeed, if something is completely still, you
> can't see it at all. That's why your eyes are always moving (saccades).
*That's* how an SEP field works. I always wondered. ;-)
Jim
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> I don't know anyone who gets that kind of standby time. My phone (which
> is fairly new) only gets about a day, maybe two of standby time.
Oh wow, that would annoy the hell out of me if I had to charge my phone
every 24-48 hours... Mine usually lasts about 5 days with a few texts and
short calls per day. I do make sure that bluetooth is turned off when I'm
not actively using it though, maybe that makes a difference?
I know my mum had to charge her old phone every 24 hours or it would die,
but she got a new battery for it and it went back to lasting for ages again
.. but yours is new.. hmmm, what make/model is it?
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>> Hard to see how you could deliberately make the system less efficient
>> without just plonking a huge 50W resistor in series (which would totally
>> screw up the quality of the sound).
>
> And why would that be?
Because if you put a resistance in there large enough to causes a
significant change in efficiency it would create a low pass filter with the
capacitance of the cable. Also the resistor would heat up, so if you
listened to loud music, after a while it would start to get quieter, and
your speakers would start to get warmer... Doesn't seem like a good idea if
you are striving for optimum sound quality...
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>> What sound does your motor make? Can you find the base frequency on your
>> keyboard?
>
> Surely that's just the resonant modes of the exhaust system and the
> chasis?
Ermm, rev your engine, notice how the pitch of the sound corresponds to the
rpms? Some part of the sound will be due to resonances in the system, but
there will be a obvious frequency component (and harmonics) that are equal
to the rpm (that obviously change with engine speed).
Actually Formula 1 teams use this exact method to check what RPM their
competitors' cars are achieving. From the RPM trace they can estimate the
power output of the engine (given they know the speed of the car, and that
all F1 cars weigh the same).
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46de288a@news.povray.org...
>
>but they are a little different to a car engine, size and rotating mass
>tend to have a lot to do with that :)
And number of cylinders as well
Marc
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scott wrote:
>> I don't know anyone who gets that kind of standby time. My phone (which
>> is fairly new) only gets about a day, maybe two of standby time.
>
> Oh wow, that would annoy the hell out of me if I had to charge my phone
> every 24-48 hours... Mine usually lasts about 5 days with a few texts
> and short calls per day. I do make sure that bluetooth is turned off
> when I'm not actively using it though, maybe that makes a difference?
I put my phone into flight mode for over a week when I was in the States
for a conference recently, because I didn't want to use it for anything
other than an alarm clock. It was switched on for the entire time, and
the battery level only went down by about 10-15%.
This seems to indicate that even on standby, a cellphone uses a
considerable amount of power simply staying in contact with the network.
I reckon if I only connected it to the network to make calls, the
battery could last up to a month.
I'm not sure bluetooth makes that much difference, because it's not
nearly as active.
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46de46c6@news.povray.org...
>>> Hard to see how you could deliberately make the system less efficient
>>> without just plonking a huge 50W resistor in series (which would totally
>>> screw up the quality of the sound).
>>
>> And why would that be?
>
> Because if you put a resistance in there large enough to causes a
> significant change in efficiency it would create a low pass filter with
> the capacitance of the cable. Also the resistor would heat up, so if you
> listened to loud music, after a while it would start to get quieter, and
> your speakers would start to get warmer... Doesn't seem like a good idea
> if you are striving for optimum sound quality...
>
Some power enclosures come with a built-in kind of protection : a light-bulb
in serie with the speakers. When input power increases, the bulb wire gets
hot then its resistance increases and the voltage at the ends of the coil
is limited.
Marc
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46de58a3@news.povray.org...
(given they know the speed of the car, and that
> all F1 cars weigh the same).
But not the same Cx
Marc
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