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>> Maybe someone could find a way to convert the sound energy from an engine
>> into mechanical or electrical energy...
>
> Some do, in a way: Resonance exhausts. They're designed to use the
> acoustic
> "bang" produced when a cylinder is opened to expel the exhaust gases, to
> resonate in the exhaust system in such a way that a lower-than-average
> pressure
> is achieved when the next cylinder opens, helping expel it.
>
> Probably must be tuned to some certain rpm optimum though.
Oh yes, that is done already in most (all?) modern cars, the length and
geometry of how the individual pipes from each cylinder join up together is
very important in making an efficient and powerful engine. In road cars of
course efficiency is usually the design goal (and the designed rpm is much
lower) rather than overall performance, but sometimes in sportier cars and
racing cars you definitely really tune the exhaust for a high rpm (usually
around maximum power revs), this results in the exhaust system getting
noticeably louder at a certain point.
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Stephen wrote:
> On Fri, 23 Jan 2009 12:46:14 -0600, Mike Raiford <"m[raiford]!at"@gmail.com>
> wrote:
>
>> Of course, I don't know how well Mg deals with heat.
>
> Woosh! Thermite :)
Not nearly as hot as thermite, but it can be (and is) used to start a
thermite reaction.
--
~Mike
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> Not nearly as hot as thermite, but it can be (and is) used to start a
> thermite reaction.
But did you ever try to light a piece of Magnesium?
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scott wrote:
>> Not nearly as hot as thermite, but it can be (and is) used to start a
>> thermite reaction.
>
> But did you ever try to light a piece of Magnesium?
>
No ... But from what I've seen, the strips used as a fuse can be
somewhat tricky to light.
--
~Mike
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> No ... But from what I've seen, the strips used as a fuse can be somewhat
> tricky to light.
From what I remember at school we had to put the bunsen burner on the "hot"
setting and hold the Mg strip in it for a few seconds before it lit. I
don't think you're going to accidentally light it at home...
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scott wrote:
>> No ... But from what I've seen, the strips used as a fuse can be
>> somewhat tricky to light.
>
> From what I remember at school we had to put the bunsen burner on the
> "hot" setting and hold the Mg strip in it for a few seconds before it
> lit. I don't think you're going to accidentally light it at home...
I lit a thin magnesium ribbon with a match.
OTOH, a nice solid lump of it probably won't burn too well. I hear they
make pencil sharpeners out of it. (Or, more likely, some alloy of it.)
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Invisible wrote:
> scott wrote:
>>> No ... But from what I've seen, the strips used as a fuse can be
>>> somewhat tricky to light.
>>
>> From what I remember at school we had to put the bunsen burner on the
>> "hot" setting and hold the Mg strip in it for a few seconds before it
>> lit. I don't think you're going to accidentally light it at home...
>
> I lit a thin magnesium ribbon with a match.
>
> OTOH, a nice solid lump of it probably won't burn too well. I hear they
> make pencil sharpeners out of it. (Or, more likely, some alloy of it.)
Great. Now I'm just going to HAVE to get a pencil sharpener and set it
ablaze. Thanks Andrew :)
--
~Mike
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>> I lit a thin magnesium ribbon with a match.
>>
>> OTOH, a nice solid lump of it probably won't burn too well. I hear
>> they make pencil sharpeners out of it. (Or, more likely, some alloy of
>> it.)
>
> Great. Now I'm just going to HAVE to get a pencil sharpener and set it
> ablaze. Thanks Andrew :)
DON'T DO IT!
ESPECIALLY IF YOUR PENCIL SHARPENER IS PLASTIC!!!
:-O
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On Mon, 26 Jan 2009 14:57:21 +0100, "scott" <sco### [at] scott com> wrote:
>> Not nearly as hot as thermite, but it can be (and is) used to start a
>> thermite reaction.
>
>But did you ever try to light a piece of Magnesium?
>
But have you ever tried to put burning magnesium out?
I remember from a fire fighting course I was on when I worked offshore that
there is a technique for doing it. You have to pour copious amounts of water on
it very slowly. Not use the normal jet from a fire hose or you have a very
spread out fire. :)
--
Regards
Stephen
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Invisible wrote:
>> Great. Now I'm just going to HAVE to get a pencil sharpener and set it
>> ablaze. Thanks Andrew :)
>
> DON'T DO IT!
>
So bright ... XD
> ESPECIALLY IF YOUR PENCIL SHARPENER IS PLASTIC!!!
>
Eeew, no way. Burning plastic is no fun. Toxic fumes make me sick.
> :-O
XD
--
~Mike
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