OOOooopps.. typo..
Should read:
"Rise in altitude and DROP in temp"
On Tue, Oct 2, 2012 at 6:02 PM, G Mann <g2ma...@gmail.com> wrote:
> Hendrik
> Point well made. True, as you go up in altitude.. temps drop.. [as a rule
> of thumb, 1 degree F per thousand ft. {same rule, different math for
> "meter/Centigrade}]. However, along with that rise in altitude, and temp,
> you also have a lowering in air density.. In the brief comments previous, I
> did not make that distinction. {ask an engineer how to sharpen a pencil he
> says... "first cut down a tree.... etc etc"]
>
> Naturally, to design a "charge air cooler system" it needs to take into
> account properly such things as ambient air density, and temperature... and
> compensate for those factors..
>
> Thus, the well employed engineers with car companies..... or... you could
> do what the "hood scope" buy did in the Original posting... and just throw
> enough S*($#t against the wall until some of it sticks and call it "good".
>
> "I wonder what the wind tunnel flow separation numbers look like on the
> "hood scope"
>
> Smiles,,,,
> Grant
>
>
> On Tue, Oct 2, 2012 at 5:27 PM, Hendrik & Fay <heni...@ozemail.com.au>wrote:
>
>> That's interesting, I would have thought that even though the air is less
>> dense at altitude it is also a lot colder.
>> Also I found that Diesel engines work better at night, which I guess may
>> be down to air density?
>>
>> Hendrik
>> who is dense
>>
>> On 03/10/12 09:03, relng...@aol.com wrote:
>>
>>> The important thing is to lower the temp of the compressed air to make it
>>> more dense and thus lower the CHT. Intercoolers have been around since at
>>> least WW2 and are common in turbocharged gas engines. Including
>>> aircraft. Even
>>> so and intercooler or not, big-inch Continental aircraft engines can
>>> overheat at high altitudes.
>>>
>>> And a bit OT, there is a new French built 4-cylinder Jet-A engine
>>> available
>>> in the Cessna 172 that is intercooled and pulls nearly 100 inches of
>>> manifold pressure. It is a compression ignition engine but is built for
>>> Jet-A, not
>>> diesel fuel.
>>>
>>> Costs about $500K, BTW.
>>>
>>> RLE
>>>
>>>
>>>
>>>
>>
>>
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>
>
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