Today's Message Index:
----------------------
1. 12:43 AM - Cortec (howado)
2. 04:57 AM - Swedish Mufflers (Phil Raker)
3. 05:01 AM - Re: Cortec (baileys)
4. 09:04 AM - Inflight adjustable pitch props / new member (Herb Fuhrer, Structural Design)
5. 03:54 PM - Swedish mufflers (Robert Schoenberger)
6. 06:04 PM - Re: Cortec (Brandon Tucker)
Message 1
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--> Zenith-List message posted by: howado <howado@cwia.com>
To the list;
all sources I checked no longer sell Zn Chromate in bulk. Only the 12
oz. spray cans are presently available, and they are no longer being
manufactured. So, we're stuck with Cortec-VPCI-373. With the added
green pigment it is supposed to be as good as Zn Cr, according to
Brian at Cortec Corp in Minneapolis.
It is only available in 5 gal pails at $282 + freight. It will coat
250 sq ft/gallon after 10% dilution with denat. alcohol. I estimate
the interior surface of the CH701 is about 450 sq. ft.
I am willing to buy the 5 gal pail and split it into 5 1-gal cans for
any builders who would like to have a gallon. Cost would be about $60
for each gallon plus shipping.
Email me at howado@cwia.com if you are interested.
Howard Carter
Message 2
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| Subject: | Swedish Mufflers |
--> Zenith-List message posted by: Phil Raker <phadr1@yahoo.com>
Joe,
As I understand what you've posted here, you have built what is
essentially a rather long "glass pack" muffler which is similar to those used
by hot-rodders in years gone by. As I remember, those bombs had mor effect on
the quality of the sound than they did on the volume, but they were usually
quite short. That type of muffler does, however, produce very little (if any)
extra back pressure. A good design for performance, and it seems, easy to
make. Thanx muchly for sharing it.
Phil Raker N556P HDS/Stratus ~85% completed
> Time: 11:01:19 PM PST US
> From: xl <xl@prosody.org>
> Subject: Construction notes.... Re: Zenith-List: Swedish Mufflers
>
> --> Zenith-List message posted by: xl <xl@prosody.org>
>
>
> He actually calls it a swiss muffler.
> From 'Firewall Forward' by Tony Bingelis, EAA 1992 pages 111-113.
> 'As you may know, Sweden and Switerland were among the first two
> countries in the world to impose strict - nay drastic - limitations
> against all noise pollution. ...... Needless to say, the homebuilders
> were motivated and quickly came up with an unusual muffler which
> seems to have become the standard Swiss homebuilt muffler. .....
> Essentially, it consists of a length of stainless steel mesh rolled
> into a tubular shape. .. Next, loosely woven cloth ... is rolled
> around the 4 to 5 foot long stainless mesh tube and its diameter is
> built up until it becomes a tight push fit into a seamless 80mm
> diameter aluminum tube.'
>
> I used a 2.5 inch diameter aluminum tube. Unfortunately I used
> 0.065 mil wall thickness. But both tubes still weigh in at about 4 pounds.
> So I'd save only 2 pounds if I could find 0.032 mil tube. I used a piece
> of mesh about 12" x 4' and wrapped it with 1.5' of 17 oz knitted
> fiberglass fabric. I cut some of the 1.5" stainless tube from my busted
> muffler and riveted it on the ends. I put a bolt through the aluminum and
> stainless tubes at the engine end to hang them. About midway down the
> tubes I put bolts through the aluminum tube to hang them there.
> (material sources: fiberlay.com, onlinemetals.com + Stoneway Hardware
> - all within bicycling distance in Seattle)
>
> They are a design that I could handle. I'm not a welder (yet :) ).
> I only have ~6 hours on the mufflers. Time will tell how they hold up.
> If the insides go away I can replace the fiberglass for $15.
> The tube cost about $45. Stainless steel mesh costs about $100. I used
> galvanized 1/8" mesh ($10) so I'll probably be replacing it. I'm looking
> for another source of stainless steel mesh before I need it. I didn't
> want to spent the $100 until I knew that the mufflers would work out.
>
> Joe E
> N633Z @ BFI
> 106 hours
>
__________________________________
Message 3
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--> Zenith-List message posted by: "baileys" <baileys@ktis.net>
I belive ZAC sells it in small quanities.
Bob B.
----- Original Message -----
From: howado
To: Zenith-List
Sent: Saturday, September 04, 2004 2:40 AM
Subject: Zenith-List: Cortec
--> Zenith-List message posted by: howado <howado@cwia.com>
To the list;
all sources I checked no longer sell Zn Chromate in bulk. Only the 12
oz. spray cans are presently available, and they are no longer being
manufactured. So, we're stuck with Cortec-VPCI-373. With the added
green pigment it is supposed to be as good as Zn Cr, according to
Brian at Cortec Corp in Minneapolis.
It is only available in 5 gal pails at $282 + freight. It will coat
250 sq ft/gallon after 10% dilution with denat. alcohol. I estimate
the interior surface of the CH701 is about 450 sq. ft.
I am willing to buy the 5 gal pail and split it into 5 1-gal cans for
any builders who would like to have a gallon. Cost would be about $60
for each gallon plus shipping.
Email me at howado@cwia.com if you are interested.
Howard Carter
Message 4
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| Subject: | Inflight adjustable pitch props / new member |
--> Zenith-List message posted by: "Herb Fuhrer, Structural Design" <aerobat02@adelphia.net>
Hi all ! Just joined last evening. I'm from east-central Ohio, and will be a
701 owner soon as I can ;o) Currently I fly an Avid MKIV, and up till yesterday
I used an IVO inflight adj.
Brandon, while doing some other upgrades, we ( my retired father helps boatloads
;o) decided to do some static thrust tests. Although our IVO has functioned
properly last ~80 hours, I've been suspect of its efficiency. I was disappointed
to find we got more static thrust out of a grnd adj GSC than we could from
the cap IVO at any pitch setting. Not bad mouthing IVO, just reporting our
test findings. Recognizing static thrust isn't an all encompassing performance
indicator, I haven't figured a way to take the tree and scales along. If interested,
I'll report again after I fly it w/ the GSC.
Herb Fuhrer
Message 5
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| Subject: | Swedish mufflers |
--> Zenith-List message posted by: "Robert Schoenberger" <hrs1@frontiernet.net>
List . . . I am extremely interested in the Swedish mufflers. I think most people
enjoy the sight of the planes, but don't enjoy the noise from them when they
fly in close proximity to their homes. As one who will someday be flying from
a rural landing strip, I want to keep on the good side of my neighbors. To
those of you who are experimenting with these types of mufflers, it will be
muchly appreciated if you would post your successes, problems, mounting, etc.
so the rest of us can build upon this important topic. Thx. Robert Schoenberger
701 - 40%
Message 6
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--> Zenith-List message posted by: Brandon Tucker <btucke73@yahoo.com>
ZAC sells the cortec 374 by the quart. I have used
both the clear 374 from ZAC and some pigmented 373
that I bought from a gentleman on this list, and I
like the pigmented 373 much better. It sprays much
more like automotive primer. My personal preference
only!!! I did not like the way the clear 374 sprayed.
I sprayed it a little thick, and it acts as a mild
adhesive. Little aluminum chips and shavings stick to
it two months later. It has a smooth glassy finish
that I don't like for a primer.
Again, this is my preference only, and is partly due
to my spraying it too thick. Also, if you aren't
using the alumaprep and alodine products, I highly
recommend them. (as many on the list do.) I am dumb
enough to have to see it for myself, and very much
liked the results. A much better bond.
Respectfully,
Brandon Tucker
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