Ed,
I understood what you ment!

I personally feel that the second of  each pair of cones may cause too much
restriction through turbulence. I understand what your saying about possibly
making the second one bigger with holes - I unsure how that would work -
seems a bit restrictive to me.

If you join the two open ends of the cones it would make for a smoother
transition, but still allow for the expansion area you are wanting, between
each joined pair.

Also no raw edges for the exhaust to chew away at.

Bill's and mine only have one of these (pair) of cones in the muffler - it's
job is to redirect the shock wave from directly seeing the exhaust exit.

George (down under)

George, here was my  idea of a muffler using cones.  The centre (smaller)
tube is perforated with the cone attached to it.  Room at the widest part

of

the cone and wall of outer tube for gas to pass.  A variation was to have
the cone extend to the outer tube wall and have all cones facing the

header

end of the muffler only permitting gas (and sound) through the perforated
centre tube.

Ed
----- Original Message -----
From: "george lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, May 02, 2006 7:42 PM
Subject: [FlyRotary] Re: new hangar


> Ed,
> My sentiments exactly - they will soon look a bit worse for wear.
> I can obviously source them from here but you will be better served if

you

> can source them locally - some of ours may in fact come from the US.
>
> If you give me a size I will get you a price, what I find the most
> expensive
> is the cost of postage to the USA.
> Bob may also have the answer! If he has a contact perhaps you could get
> them
> made out of 321SS
> George
>
>> How about a source for the more reasonable priced cones, George.  I
>> obviously don't care about the finish since they will go inside - just
>> the
>> material and cost.  Thanks
>>
>> Ed
>> ----- Original Message -----
>> From: "george lendich" <lendich@optusnet.com.au>
>> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>> Sent: Tuesday, May 02, 2006 12:11 AM
>> Subject: [FlyRotary] Re: new hangar
>>
>>
>> > Ed,
>> > That's way too dear, you should be able to get them for about $10 US
>> > ea.
> I
>> > must admit I had to shop around as well. The ones I ended up with
> weren't
>> > as
>> > perfectly finished as the expensive one but the same material 316SS.
>> > Our design has an inner cooling tube and an outer cooling tube and

heat

>> > shield, all the ends are cones as well!
>> > All I have to do is get my welder to finish it.
>> > George
>> >
>> > George ( down under)
>> >
>> >> Sounds like the right formula, George - will wait for your >> >> project's
>> > outcome
>> >> before I try cones.  Yes, I did find some cone  inserts at $60.00

USD

>> > each.
>> >> I would need 4 for my two tubes - hummm makes one tube sound better
>> >> all
>> > the
>> >> time.
>> >>
>> >> Ed
>> >>
>> >> ----- Original Message -----
>> >> From: "george lendich" <lendich@optusnet.com.au>
>> >> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>> >> Sent: Monday, May 01, 2006 7:48 PM
>> >> Subject: [FlyRotary] Re: new hangar
>> >>
>> >>
>> >> >
>> >> >> Just the shells, TJ, the 1/8" thick SS washers are history.  I

have

>> >> >> concluded that no reasonable thickness of metal will stand up to
>> >> >> the
>> >> > exhaust
>> >> >> pulse for long if it is perpendicular to the shock wave.  I

believe

>> > that
>> >> > if
>> >> >> I could shape them into cones where by the shock wave would hit

the

>> > side
>> >> > of
>> >> >> the cone  at an oblique angle  would probably survive - now all >> >> >> I
> have
>> > to
>> >> > do
>> >> >> is find some {:>).
>> >> >>
>> >> >> Ed
>> >> >
>> >> > Ed,
>> >> > There plenty of SS cones available in 1.6mm, I'm using them in my
>> > exhaust
>> >> > which is a joint venture design with Bill Jepson - the idea is to
>> > redirect
>> >> > the shock waves but not restrict the exhaust, as you have alluded
>> >> > to.
>> >> > George ( down under)
>> >> >
>> >> >
>> >> > --
>> >> > Homepage:  http://www.flyrotary.com/
>> >> > Archive and UnSub:

http://mail.lancaironline.net/lists/flyrotary/

>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> Homepage:  http://www.flyrotary.com/
>> >> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>> >
>> >
>> > --
>> > Homepage:  http://www.flyrotary.com/
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>> >
>>
>>
>>
>> --
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>
>
> --
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