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Ed,
I can't do the impossible {:>)
I figure the first thing to do is get something
that works and maybe redesign for lightness. A lot of aviation
muffler welders make their own tapers etc.and they could be lighter. The
off-the-shelf types are 1.6mm and most are 316 SS, Perhaps 1.2 might do, also
the outer skin ( heat shield) is integral to the design.
Hey It ain't too heavy!
George ( down under)
That's impressive, George. Remember, its got to be
light {:>)
Ed
----- Original Message -----
Sent: Thursday, January 10, 2008 5:53
PM
Subject: [FlyRotary] Re: URL for
HushPower
Ed see attached,
This is the parts count ( outer skin not
shown) and my welder doing an internal reflector.
I must get this completed!!
George ( down under)
Ed,
I know - I seen that smiley face.
Still looking for photos.
George
I understand, George. Was pulling your leg a
bit. Still looking forward to the results when you get it
there.
Ed
----- Original Message -----
Sent: Thursday, January 10, 2008
2:34 AM
Subject: [FlyRotary] Re: URL for
HushPower
Ed,
Indeed talk is cheap, however I've had to
spend a bit so far and my poor allowance only goes so far. I've been
bucking for an increase but the boss ( she who must be obeyed) won't
give me one. The problem is I've still got two apprentices living at
home - you know family first etc.
I will get onto it soon though, but I
haven't got a single engine complete to test it on - I designed it for
the single but with slight mods it will also do the 2
rotor.
You were on the right track Ed, but you
can't put exposed edges to the rotary exhaust - I see the holes in the
cones as exposed edges.
I have some photo's somewhere but can't
find them, as soon as I do I will post them. It does look
spectacular!!
George ( down under)
Hey, George
Talk is cheap {:>), I want to know when we
get to the meaty part about how well it works?
I've done my experimenting with exhausts -
every time I got one part of the problem fixed - like sound
loudness, I experienced a failure/draw back someplace else - of
course, could just be my ineptitude. I really thought I had it
when I put the 1/8" thick discs in the tubes - it did really knock
the sound down, but the exhaust pulses broke the welds loose
and the discs spun fast enough to give the exhaust a turbine sound
of its ownl {:>).
Looking forward to seeing the results,
George
Ed.
----- Original Message -----
Sent: Wednesday, January 09,
2008 6:58 PM
Subject: [FlyRotary] Re: URL
for HushPower
Ed,
I believe if Dave Leonard
can now 'see the light' through the muffler - it may be an
indicator that the sound waves have broken through the joining
cones. In any event it will only get louder at the passage gets
bigger.
I figured this would be the
weakest link in the HushPower design as it concentrates all the
energy into the smallest area, holes in the cones also
weaken the area - not so with our design.
George ( down under)
Ed,
Reflective cone theory is what Bill
Jepson and I have designed into our joint venture exhaust
design - although I haven't finished it so I
don't know how well it works.
The principle is to maintain a
clear passage for the exhaust flow but redirect the sound waves
(which are energy) therefore turning the sound into heat.
In our design the heat is dissipated with cool air flow through
the exhaust and further cool air around the
exhaust.
However this is not a cheap exhaust
to make, as mine is assembled out of a number of cones ( 1.6mm
SS). I think the cost of the cones came to $200 and then there's
the welding. There is also the fact that it is also not light
because of the thickness of the material.
The bottom line is that cones by
their nature redirect sound energy into heat. The idea is to not
have a direct exit for the sound energy - this has been achieved
in this design by having the sound waves inter the center of a
cone which is blocked-off and is redirected through the holes
and redirected out.
So the theory in this design (
HushPower) is sound - excuse the pun. The packing material
merely protects the light outer skin. There will be a tremendous
amount of heat in the inner chambers so I don't know how long
they will last, maybe there thick enough to take it ? However if
their cheap enough just replace them.
George ( down under)
Sent: Thursday, January
10, 2008 4:34 AM
Subject: [FlyRotary] URL
for HushPower
It looks like Hushpower has been spun
off from FlowMaster. Here is the URL for the Hushpower
site.
Ed
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