> Did the engine you get have a muffler? The ones I saw 'new' on net
> all had mufflers.
Unless its muffler looks a HECK ofa lot different than an automotive
or lawnmower muffler, then no. This thing is going to be LOUD.
> I don't think it is that easy to swap fuels. Esp from liquid/air
It is in principle...in practice, however... :-) Of course, these
things
are made for hobbyists...and hobbyists aren't going to tear them
down every 25 hours and rebuild them, etc. They may be more
robust than "typical" engines, and perhaps even more fuel flexible.
> Also, this little engine, like lawnmowers uses fuel and oil mix for
> lubrication, it probably can't have a seperate 'just oil'
> lubrication system.
That's what I was wondering about. Even if I could effect a change
in the fuel delivery system, how would I lubricate the thing? An
oil mist would work, but that adds complexity and eliminates the
off-the-shelf appeal.
> I wonder what the ignition system is? I doubt it has a
> sparkplug/coil ignition system. Diesels spontanously combust due
> to
> pressure and heat. I did not think that was possible with gas.
I'm not positive what this thing runs off of -- gotta get it out and look
up some information on the net. But, I suspect it's a liquid fuel,
delivered through either a carburetor or perhaps a simple needle
valve. There is a "slide" on the side that looks to be a throttle.
> After doing some research it does seem that these engines are like
> diesels since many talk about glow plugs (needed to heat the
> combustion chamber to start the 'spontanous' ignition.
> Hmmmm, want to find one and rip it apart now.
Probably either a glow plug or spontaneous ignition, i.e. diesel.
They're the simplest...I doubt these little engines require teardown
constantly, like an av engine does.
> BTW I think this idea rocks if only to supply power for long
> wilderness trips. Something I've always wanted a wearable/video
> system on but did not want all the bateries.
Well, thank you!
> specs for one .15 engine (i'm guessing that is .15 cubic inches)
> Engine Weight: 6.3 oz
> Muffler Weight: 1.9 oz
> Power: .41hp @17,000rpm
> Prop Size: 7x5 -- 8x4
> cost is $60
Cheap enough. And .41hp? That's like 325 watts continuous!
Even assuming an inefficient conversion to electric, that's a
heck of a punch! At 10% that's 32.5 watts continuous, which
is enough to power some desktops, much less a power frugal
wearable.
Heck of a lot cheaper than Li-Ion battery packs, too.
-- Chuck Knight
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