[DeTomaso] Theory, Science and religion.

[adin at frontier.net]

It IS NOT that simple.  Too many variables.

You can theorize, postulate, preach, moan and whine all you want but  
comparing apples to oranges almost always does NOT work.  One (i.e.  
most dawgs) need to test in conditions closest condition possible,  
ALWAYS.

I.E. (in example):  I have a hot rod truck, I "do" all the numbers,  
dances and exortations. Yup, looks fast, sounds fast, has the correct  
final drive ratio, I've got the spiffy driver's suit. I have even done  
all the "science." [1]

Is this the fastest truck?

Answer:  Not until one takes it to the great white dyno and (what?)  
goes faster than anyone else has ever gone.

Moral:  You have to PROVE the theory before it becomes fact.

[1] Science: smoke, mirrors, voodoo, cool decals and theory.  Proof  
comes later.

The Pope has spoken, let it be so.
But, but I have the big tailpipe . . . . .Prayer, voodoo and science  
don't make it so - doin' it makes it so.
Quoting Mark McWhinney <msm at portata.com>:

> As the ORR folks will point out, its not that simple.  As a rule of thumb,
> you loose about three Fahrenheit degree for every 1,000 feet that you climb.
> At 6,000 feet the ambient temperature would be about 18 degrees cooler.
>
> Also with the lower density air, the engine would be producing less HP.  I
> assume that this means that you would be putting less heat into the coolant.
> (or maybe you would have to put your foot into it for more HP to maintain
> speed which would put more heat into the coolant.) I dunno.  When the Dawg
> wakes up from his nap, he can give us the poop on it.
>
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
> Behalf Of Michael Shortt
> Sent: Thursday, June 14, 2007 8:37 AM
> To: lwall at wt-inc.com
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] Any rocket scientists out there
>
> Yes, one will run cooler,
> I am no rocket scientist ( but I did build several model rockets and I
> stayed in a Holiday Inn Express last night )
>
> here's what I found that should be applicable to radiators which are heat
> sink type devices as well.
>
>
> Michael in Savannah
>
>
> Since the density of air varies with altitude, so does the efficiency of a
> heat sink. I wonder how many consumer equipment makers take this into
> consideration?  As can be seen from the table below, the effects are not
> insignificant.
>     *Altitude (Metres)* *Altitude (Feet)* *Derating Factor* 0 (sea level) 0
> 1.00 1,000 3,000 0.95 1,500 5,000 0.90 2,000 7,000 0.86 3,000 10,000 0.80
> 3,500 12,000 0.75 *Altitude Derating Factors*
>
> The altitude effect should be considered in all cases, since many electronic
> systems are installed at an elevated altitude, it is necessary to derate the
> heat sink performance mainly due to the lower air density caused by the
> lower air pressure at higher altitude. The table shows the performance
> derating factors for typical heat sinks at high altitudes. For example, in
> order to determine the actual thermal performance of a heat sink at
> altitudes other than sea level, the thermal resistance values read off from
> the performance graphs should be divided by the derating factor before the
> values are compared with the required thermal resistance.
>
> Example:  A 1° C/W heatsink would become 1.16° C/W at an altitude of 2,000
> metres, or 1.25° C/W at 3,000 metres.
>
>
>
> On 6/14/07, Lynn Wall <lwall at wt-inc.com> wrote:
>>
>> All,
>>
>>
>>
>> This may be a stupid question and probably covered in the past but I have
>> not read anything related and those I have asked are not sure either so
>> here
>> goes:
>>
>>
>>
>> Two virtually identical cars (or the same car if it helps), one at sea
>> level
>> and one at 6,000' elevation.  80 degree day in both locations, exact same
>> driving, exact same humidity, timing, tuning, etc.  Will one car run
>> cooler
>> than the other?
>>
>>
>>
>> Basically I'm trying to find out what effect elevation and therefore
>> thinner
>> air has on the cooling (if any) of a car.  It strikes me that if there is
>> less air going through the radiator due to the thinner air then you would
>> have less cooling.  Am I wrong or crazy?
>>
>>
>>
>> Just curious,
>>
>>
>>
>> Lynn, maybe the thinner air is getting to me
>>
>>
>>
>>
>>
>> Lynn R. Wall, President
>> Western TelCom Inc.
>> Phone 801-288-2001
>> Fax 801-288-2002
>>
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>
>
>
> --
> Michael L. Shortt
> Savannah, Georgia
>
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