> * They are loud as hell. Even muffled, they are generally WAY louder
> than you'd think they could possibly be. Running one indoors on a
> test
> bench is painful without ear protection.
I wonder if active noise cancellation could produce a "better
muffler?"
Andrea produces a microphone headset that has this built in --
it actively produces a cancelling wave that produces clearer,
"quieter" recordings.
Since there are no big "bulges" on the ear mounted headset,
I'm guessing it's a simple circuit, perhaps including an LSI
chip.
Same technology, installed in a box, could "eliminate" a lot
of the noise. Hmmm...wonder how quiet we could make one
of these things?
> * They burn gas relatively fast. They're not very efficient at all,
That surprises me... Usually diesels are relatively efficient,
if designed right.
> of the glow plug, and either flip the prop manually (a bad idea,
> usually), or use a spring or electric device to turn the prop. This
I have this image of a lawnmower pull cord mounted on the
side of a beeper or cell phone. :-) Brought a grin to my face!
> plug's glowing element contains platinum, and it's kept glowing
> partly
> by a chemical reaction between the platinum and the fuel).
Makes sense -- platinum is a catalyst. Same stuff as is in a
"catalytic converter" in a car.
> * The fuel is not normal gasoline, but a mixture of methanol and oil
> (usually castor oil. See the page mentioned above for more on this).
So it *is* a liquid fuel? I had a feeling.
> There are some restrictions on what you can use as fuel, and IIRC it
> produces some fairly foul exhaust. Running indoors is not
> recommended.
What kinds of restrictions? Legal?
-- Chuck Knight
P.S. Just for the sake of reference, I did not buy this thing for use
as a power source for a wearable. But, once I started thinking
about it...seems like it could work.
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