Today's Message Index:
----------------------
1. 07:43 AM - Re: more airfoil talk (Robert Haines)
2. 07:44 AM - walnut shells and airfoil talk (Robert Haines)
3. 08:04 AM - Re: walnut shells and airfoil talk (del magsam)
4. 08:11 AM - Re: walnut shells and airfoil talk (Christian Bobka)
5. 08:22 AM - Re: walnut shells and airfoil talk (del magsam)
6. 09:03 AM - Re: walnut shells and airfoil talk (Christian Bobka)
7. 09:12 AM - Re: walnut shells and airfoil talk (Robert Haines)
8. 09:20 AM - Aviation Wisdom (MacklemAW@aol.com)
9. 09:27 AM - Re: walnut shells and airfoil talk (Cy Galley)
10. 09:38 AM - Re: walnut shells and airfoil talk (Cy Galley)
11. 09:43 AM - Recommended Reading (MacklemAW@aol.com)
12. 09:52 AM - Re: Re: walnut shells and airfoil talk (Jim Vydra)
13. 09:52 AM - Re: walnut shells and airfoil talk (Robert Haines)
14. 10:52 AM - Re: walnut shells and airfoil talk (Larry Ragan)
15. 11:04 AM - Re: walnut shells and airfoil talk (Robert Haines)
16. 11:19 AM - Re: walnut shells and airfoil talk (Deon Engelmann)
17. 12:08 PM - Re: walnut shells and airfoil talk (walt evans)
18. 01:35 PM - Re: walnut shells and airfoil talk (Robert Haines)
19. 04:27 PM - Re: Re: walnut shells and airfoil talk (walt evans)
Message 1
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Subject: | Re: more airfoil talk |
--> Pietenpol-List message posted by: "Robert Haines" <robertsjunk@hotmail.com>
Well, yea, that's the exact attitude you should have with any unproven
aircraft, even one with the FC-10 airfoil. There are hundreds of things
that can go wrong, you should always try to completely understand all the
risks and develop plans to mitigate them. Yes, one would be to use a proven
airfoil, that would be one less risk, no argument there. But let me ask,
how exactly did Bernie develop this airfoil? Did he pour through endless
wing section diagrams, did he develop remote control models, did he run
computer analysis or do wind tunnel test? As I understand, he made several
sets of wings and tried them all out on the plane, and then decided on the
one he liked best. As the story goes, he spent all of 10 minutes drawing
that one out.
I am not advocating any unsafe methodology to procede with the design,
development, and construction of an aircraft. I also think to many people
foolhartedly proceed with an existing design and just "burn-off" the flight
hours required in the initial testing phase. Simply because this design is
proven over and over, does not mean that your new aircraft is free from the
scrutiny required for any new experimental aircraft, and I would strongly
suggest that you initially fly the plane as if it were about to experience
any sort of catastrophic failure.
Regarding the comments to wing flutter: yes, flutter is a likely event when
increasing the speed of an aircraft with unbalanced control surfaces.
Although, how many who have considered that putting in more powerful
engines, providing covers over the wheels, or streamlining any other area
would increase the speed of the aircraft to a point that the control
surfaces would flutter? I haven't heard one word. Not to say that it would
or wouldn't, and I hope I don't sound like I'm lecturing, but my point is
that changes in design always have to be taken with a strong consideration
to the consequences. Changing the airfoil is just simply another one of
those things that you must provide a concious effort to seek out the results
of said change and that's how you proceed with an EXPERIMENTAL aircraft.
OK, getting off soapbox now. Thank you for your support.
Robert Haines
Du Quoin, Illinois
> From: BARNSTMR@aol.com
> Subject: Re: Pietenpol-List: Re: more airfoil talk
>
> Have you ever read about Jimmy Doolittle's test flight of a highly
modified
> Travel Air Mystery ship? The airplane, owned by Shell Oil Company, was
taken
> to Parks College in St. Louis for refurb.... I think in 1931 or 1932.
They
> did an aerodynamic clean-up adding sweeping wing filet fairings, and other
> changes, including an airfoil mod. The first flight lasted about 30
minutes with
>
> Jimmy Doolittle at the controls. He climbed to approx 5000ft. and joined
up
> with a camera ship. One in-flight picture was taken as far as I have ever
seen.
>
> Jimmy claimed the "Shell 400" was performing so well that he decided to
do a
> high speed pass over the field. At an altitiude of less than 50 ft,
aileron
> flutter set in so bad that Doolittle had no choice but to pull up and bail
> out. His Parachute flight was said to be the lowest on record up to that
time.
>
> Lucky that the canopy opened in time. The second picture of the "Shell
400"
> that I know of is of the mangled twisted wreckage.
>
> I don't know about you guys, but I feel that its going to take some biig
> cahoooonas for me to climb into the Piet for that first flight. I would
wear a
>
> 'Chute, but I doubt I could fit in the cockpit with it, much less pry
myself
> loose to bail out if anything happened. Go ahead and do your research and
> experiment with another airfoil if you must. But I'll pass. I'd much
rather test
>
> my airplane with the known FC-10.
>
> my $ .02
>
> TLB
Message 2
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Subject: | walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Robert Haines" <robertsjunk@hotmail.com>
Just sent my rant about airfoils, caught three misspellings after the fact,
I hate that.
To all those who are building a Corvair engine, it's been suggested that
abrasive blasting with walnuts shells is a great way to get the surfaces
clean and bright. As I have a sandblaster, I started looking for a supplier
of walnut shells. Eastwood (automotive products, etc.) had a 50lb bag for
$45 plus $30 shipping, I about choked. That seemed to be the same price for
all the traditional suppliers. Fortunately, I found a food producer that
sells walnut products and sells the walnut shells, ground to several
different sieves, as a byproduct. They are Hammons
(http://www.black-walnuts.com/) out of Missouri and the 50lb bag was $15
plus about that for shipping. They took a phone order by credit card, and
the bag arrived four days later.
I had to explain to the wife when she saw the receipt what the heck I needed
50lbs of walnut shells for.
Robert Haines
Du Quoin, Illinois
Message 3
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Subject: | Re: walnut shells and airfoil talk |
great info Robert, what grade did you buy? and please post on how they work for
you, or if a different grade should be bought.
Del
Robert Haines <robertsjunk@hotmail.com> wrote:
--> Pietenpol-List message posted by: "Robert Haines"
Just sent my rant about airfoils, caught three misspellings after the fact,
I hate that.
To all those who are building a Corvair engine, it's been suggested that
abrasive blasting with walnuts shells is a great way to get the surfaces
clean and bright. As I have a sandblaster, I started looking for a supplier
of walnut shells. Eastwood (automotive products, etc.) had a 50lb bag for
$45 plus $30 shipping, I about choked. That seemed to be the same price for
all the traditional suppliers. Fortunately, I found a food producer that
sells walnut products and sells the walnut shells, ground to several
different sieves, as a byproduct. They are Hammons
(http://www.black-walnuts.com/) out of Missouri and the 50lb bag was $15
plus about that for shipping. They took a phone order by credit card, and
the bag arrived four days later.
I had to explain to the wife when she saw the receipt what the heck I needed
50lbs of walnut shells for.
Robert Haines
Du Quoin, Illinois
Del-New Richmond, Wi
"farmerdel@rocketmail.com"
---------------------------------
Message 4
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Christian Bobka" <bobka@compuserve.com>
If you use industrial grade baking soda, it does a good job and is water
soluable so that you rinse the engine out with water when you are done and
all the abrasive is gone.
Chris Bobka
----- Original Message -----
From: "Robert Haines" <robertsjunk@hotmail.com>
Subject: Pietenpol-List: walnut shells and airfoil talk
>
> --> Pietenpol-List message posted by: "Robert Haines"
<robertsjunk@hotmail.com>
>
> Just sent my rant about airfoils, caught three misspellings after the
fact,
> I hate that.
>
>
> To all those who are building a Corvair engine, it's been suggested that
> abrasive blasting with walnuts shells is a great way to get the surfaces
> clean and bright. As I have a sandblaster, I started looking for a
supplier
> of walnut shells. Eastwood (automotive products, etc.) had a 50lb bag for
> $45 plus $30 shipping, I about choked. That seemed to be the same price
for
> all the traditional suppliers. Fortunately, I found a food producer that
> sells walnut products and sells the walnut shells, ground to several
> different sieves, as a byproduct. They are Hammons
> (http://www.black-walnuts.com/) out of Missouri and the 50lb bag was $15
> plus about that for shipping. They took a phone order by credit card, and
> the bag arrived four days later.
>
> I had to explain to the wife when she saw the receipt what the heck I
needed
> 50lbs of walnut shells for.
>
>
> Robert Haines
> Du Quoin, Illinois
>
>
Message 5
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Subject: | Re: walnut shells and airfoil talk |
where is a source of industrial grade baking soda?
Del
Christian Bobka <bobka@compuserve.com> wrote:
--> Pietenpol-List message posted by: "Christian Bobka"
If you use industrial grade baking soda, it does a good job and is water
soluable so that you rinse the engine out with water when you are done and
all the abrasive is gone.
Del-New Richmond, Wi
"farmerdel@rocketmail.com"
---------------------------------
Message 6
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Subject: | Re: walnut shells and airfoil talk |
Del,
Try this website for info:
http://www.transportandconstruction.co.za/rasmech.html
I know, I know they are in New Zealand. But there was a guy in Winona marketing
this stuff at Oshkosh about ten years ago. His name is Mike Thern. I think
he was a teacher in the aviation tech school down at the winona airport. I would
contact him at the airport at 507 864 2705 or at home at 507 454 2705 and
ask him where it can be had. These phone numbers a current as I just got the
info from the Luscombe association newsletter that came in saturday's mail.
I know the soda is cheap. He may be out of the business becuase it is so easy
to purchase hence everybody bought it elsewhere. Please let the piet list know
what you find out.
chris bobka
----- Original Message -----
From: del magsam
To: pietenpol-list@matronics.com
Sent: Monday, February 02, 2004 10:20 AM
Subject: Re: Pietenpol-List: walnut shells and airfoil talk
where is a source of industrial grade baking soda?
Del
Christian Bobka <bobka@compuserve.com> wrote:
--> Pietenpol-List message posted by: "Christian Bobka"
If you use industrial grade baking soda, it does a good job and is water
soluable so that you rinse the engine out with water when you are done and
all the abrasive is gone.
Del-New Richmond, Wi
"farmerdel@rocketmail.com"
Message 7
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Robert Haines" <robertsjunk@hotmail.com>
I've got no experience here, but I chose the 20/30 (they mentioned it was
one of the more popular grades), it appeared to be middle of the line medium
abrasive. Now that I have it, it has the size of coarse sand, just for
comparison, but I'm sure walnut shell sieve and sand sieve do not correspond
as far as fine/medium/coarse grading. I haven't used it yet, I can't
comment yet.
Also, baking soda, I've read somewhere at sometime and may or may not be
right (how's that for a disclaimer?) attacks aluminum. Again, I don't know
for sure. Although, I do know that walnut shells pose no chemical danger.
:)
I do have a copy of the CORSA magazine that has the proceedings from a CORSA
presentation that the plant manager of the engine factory gave (November
1997?). It was interesting but I wished there was more technical details on
how they did what they did. He mentioned that the heads and cases were low
pressure die cast with sand cores. They had problems getting the core sand
out of the heads until they figured out about abrasive blasting with walnut
shells, and so that's how they were cleaned at the factory. He mentioned
that they bought walnut shells by the rail car load. So, if it's good
enough for the guys who built them in the first place, it'll be OK with me.
Robert Haines
Du Quoin, Illinois
Message 8
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Only a portion of this applies to Piets. But I hope you enjoy the Addenda
For Fliers:
"Though I Fly Through the Valley of Death ...I Shall Fear No Evil ... For I
am at 80,000 Feet and Climbing. (Sign over the entrance to the SR-71 operating
location Kadena, Japan).
There is no reason to fly through a thunderstorm in peacetime. (Sign over
Squadron Ops desk at Davis-Monthan AFB, AZ, 1970).
Advice given to RAF pilots during WW II. When a prang (crash) seems
inevitable, endeavor to strike the softest, cheapest object in the vicinity as
slowly
and gently as possible.
You've never been lost until you've been lost at Mach 3. (Paul F.Crickmore,
test pilot)
From an old carrier sailor - Blue water Navy truism; there are more planes in
the ocean than submarines in the sky.
Navy carrier pilots to Air Force pilots: Flaring is like squatting to pee.
When one engine fails on a twin-engine airplane you always have enough power
left to get you to the scene of the crash.
What is the similarity between air traffic controllers and pilots? If a pilot
screws up, the pilot dies; If ATC screws up, the pilot dies.
Never trade luck for skill.
The three most common expressions (or famous last words) in aviation are:
"Why is it doing that?", "Where are we?", and "Oh S#!+!"
Weather forecasts are horoscopes with numbers.
Airspeed, altitude, and brains. Two are always needed to successfully
complete the flight.
A smooth landing is mostly luck; two in a row is all luck; three in a row is
prevarication.
Flashlights are tubular metal containers kept in a flight bag for the purpose
of storing dead batteries.
Flying the airplane is more important than radioing your plight to a person
on the ground incapable of understanding or doing anything about it.
When a flight is proceeding incredibly well, something was forgotten.
Just remember, if you crash because of weather, your funeral will be held on
a sunny day.
The Piper Cub is the safest airplane in the world; it can just barely kill
you. (Attributed to Max Stanley, Northrop test pilot)
If you're faced with a forced landing, fly the thing as far into the crash as
possible. (Bob Hoover - renowned aerobatic and test pilot)
If an airplane is still in one piece, don't cheat on it; ride the bastard
down. (Ernest K. Gann, author &aviator)
Never fly in the same cockpit with someone braver than you.
You know that your landing gear is up and locked when it takes full power to
taxi to the terminal.
Basic Flying Rules: Try to stay in the middle of the air. Do not go near the
edges of it. The edges of the air can be recognized by the appearance of
ground, buildings, sea, trees and interstellar space. It is much more difficult
to
fly there.
Allan W. Macklem
Elkhorn, NE
TEL: 402 880 6559 // 402 289 2298 FAX: 402 289 3474
Personal growth comes from being
surrounded by highly talented people.
Message 9
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Cy Galley" <cgalley@qcbc.org>
What is the difference between baking soda and industrial grade BS? More
for a cheaper per pound price?
----- Original Message -----
From: "Christian Bobka" <bobka@compuserve.com>
Subject: Re: Pietenpol-List: walnut shells and airfoil talk
> --> Pietenpol-List message posted by: "Christian Bobka"
<bobka@compuserve.com>
>
> If you use industrial grade baking soda, it does a good job and is water
> soluable so that you rinse the engine out with water when you are done and
> all the abrasive is gone.
>
> Chris Bobka
> ----- Original Message -----
> From: "Robert Haines" <robertsjunk@hotmail.com>
> To: <pietenpol-list@matronics.com>
> Sent: Monday, February 02, 2004 9:44 AM
> Subject: Pietenpol-List: walnut shells and airfoil talk
>
>
> >
> > --> Pietenpol-List message posted by: "Robert Haines"
> <robertsjunk@hotmail.com>
> >
> > Just sent my rant about airfoils, caught three misspellings after the
> fact,
> > I hate that.
> >
> >
> > To all those who are building a Corvair engine, it's been suggested that
> > abrasive blasting with walnuts shells is a great way to get the surfaces
> > clean and bright. As I have a sandblaster, I started looking for a
> supplier
> > of walnut shells. Eastwood (automotive products, etc.) had a 50lb bag
for
> > $45 plus $30 shipping, I about choked. That seemed to be the same price
> for
> > all the traditional suppliers. Fortunately, I found a food producer
that
> > sells walnut products and sells the walnut shells, ground to several
> > different sieves, as a byproduct. They are Hammons
> > (http://www.black-walnuts.com/) out of Missouri and the 50lb bag was $15
> > plus about that for shipping. They took a phone order by credit card,
and
> > the bag arrived four days later.
> >
> > I had to explain to the wife when she saw the receipt what the heck I
> needed
> > 50lbs of walnut shells for.
> >
> >
> > Robert Haines
> > Du Quoin, Illinois
> >
> >
> >
> >
> >
> >
> >
> >
>
>
Message 10
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Cy Galley" <cgalley@qcbc.org>
What grit size did you buy?
----- Original Message -----
From: "Robert Haines" <robertsjunk@hotmail.com>
Subject: Pietenpol-List: walnut shells and airfoil talk
> --> Pietenpol-List message posted by: "Robert Haines"
<robertsjunk@hotmail.com>
>
> Just sent my rant about airfoils, caught three misspellings after the
fact,
> I hate that.
>
>
> To all those who are building a Corvair engine, it's been suggested that
> abrasive blasting with walnuts shells is a great way to get the surfaces
> clean and bright. As I have a sandblaster, I started looking for a
supplier
> of walnut shells. Eastwood (automotive products, etc.) had a 50lb bag for
> $45 plus $30 shipping, I about choked. That seemed to be the same price
for
> all the traditional suppliers. Fortunately, I found a food producer that
> sells walnut products and sells the walnut shells, ground to several
> different sieves, as a byproduct. They are Hammons
> (http://www.black-walnuts.com/) out of Missouri and the 50lb bag was $15
> plus about that for shipping. They took a phone order by credit card, and
> the bag arrived four days later.
>
> I had to explain to the wife when she saw the receipt what the heck I
needed
> 50lbs of walnut shells for.
>
>
> Robert Haines
> Du Quoin, Illinois
>
>
Message 11
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Subject: | Recommended Reading |
I very much enjoyed these and recommend them to you.
Unlocking The Sky (Glenn Hammond Curtiss) by Seth Shulman, Perennial, Harper
Collins Publishers, 2003.
Wings of Madness (Alberto Santos-Dumont) by Paul Hoffman, Hyperion Publisher,
2003.
First World Flight (Billy Mitchell) by Spencer Lane, U.S. Press, 2002.
Allan W. Macklem
Elkhorn, NE
TEL: 402 880 6559 // 402 289 2298 FAX: 402 289 3474
Personal growth comes from being
surrounded by highly talented people.
Message 12
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Subject: | Re: walnut shells and airfoil talk |
I bet the walnut standards are identicle to sand standards...The American Standards
Institute (ASI) sets all standards...I live near Stockton, MO where Hammons
is located. They sell to many industries. Can't imagine an industry that
would buy an abrasive without knowing what standard grade it is
Robert Haines <robertsjunk@hotmail.com> wrote:--> Pietenpol-List message posted
by: "Robert Haines"
I've got no experience here, but I chose the 20/30 (they mentioned it was
one of the more popular grades), it appeared to be middle of the line medium
abrasive. Now that I have it, it has the size of coarse sand, just for
comparison, but I'm sure walnut shell sieve and sand sieve do not correspond
as far as fine/medium/coarse grading. I haven't used it yet, I can't
comment yet.
Also, baking soda, I've read somewhere at sometime and may or may not be
right (how's that for a disclaimer?) attacks aluminum. Again, I don't know
for sure. Although, I do know that walnut shells pose no chemical danger.
:)
I do have a copy of the CORSA magazine that has the proceedings from a CORSA
presentation that the plant manager of the engine factory gave (November
1997?). It was interesting but I wished there was more technical details on
how they did what they did. He mentioned that the heads and cases were low
pressure die cast with sand cores. They had problems getting the core sand
out of the heads until they figured out about abrasive blasting with walnut
shells, and so that's how they were cleaned at the factory. He mentioned
that they bought walnut shells by the rail car load. So, if it's good
enough for the guys who built them in the first place, it'll be OK with me.
Robert Haines
Du Quoin, Illinois
Message 13
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Robert Haines" <robertsjunk@hotmail.com>
Industrial grade BS?! (oh, you meant baking soda...)
RH
Message 14
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Subject: | walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Larry Ragan" <lragan@hotmail.com>
I think if you were to use regular baking soda (sodium bicarbonate) you could purchase
it through swimming pool suppliers. It is used to balance ph and can be
purchased in 50# bags. Don't buy it at the local pool supplier because they
repackage it in 5#containers....rename it....and jack the price up.
Larry Ragan
Jacksonville, Fl.
lragan@hotmail.com
Message 15
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Robert Haines" <robertsjunk@hotmail.com>
Apparently I didn't do a good job making my point. What I meant to say was
that walnut shells at 20 sieve (U.S. Mesh at approximately 0.030" in
diameter so says Hammons) and sand at 20 sieve may not be considered in the
same abrasive category; where a 20 sieve sand is considered "coarse" (I'm
pretty sure about that), 20 sieve walnut shell may be considered "medium"
(or "coarse" or "fine"). I'm not sure of this gradation, but this is the
point I was trying to make. They could be graded exactly the same, I just
didn't want to assume this to be true considering they are somewhat
different materials.
What I want is a "medium" walnut shell abrasive since my parts are not
covered with mud, crud, paint, rust, etc. Also, most abrasives get smaller
with use, so eventually (no telling how long) I would likely end up with
"fine" anyway. Since Hammons, in their FAQ section, noted that 8/12, 12/20,
and 20/30 were their most popular, and my assumption was most applications
use "coarse" and "medium", I concluded that 20/30 was probably "medium".
Just a guess.
Robert Haines
Du Quoin, Illinois
Message 16
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Subject: | walnut shells and airfoil talk |
Hi
This company is actually in Alrode, Johannesburg, South Africa (.co.za
).
It is about 25 min from where I stay.
Deon Engelmann
EAA322 Midrand # SA12055
Pretoria
South Africa
-----Original Message-----
From: owner-pietenpol-list-server@matronics.com
[mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of
Christian Bobka
Subject: Re: Pietenpol-List: walnut shells and airfoil talk
Del,
Try this website for info:
http://www.transportandconstruction.co.za/rasmech.html
I know, I know they are in New Zealand.
where is a source of industrial grade baking soda?
Del
Message 17
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "walt evans" <wbeevans@verizon.net>
In my line of work, over the years, when we wanted less destructive blasting
we always used ground corn cob. It comes in the consistisy <sp> of corn
meal but it's the cob. Think places like Grainger or McMaster Carr stocks
it.
walt evans
NX140DL
----- Original Message -----
From: "Robert Haines" <robertsjunk@hotmail.com>
Subject: Pietenpol-List: walnut shells and airfoil talk
> --> Pietenpol-List message posted by: "Robert Haines"
<robertsjunk@hotmail.com>
>
> Just sent my rant about airfoils, caught three misspellings after the
fact,
> I hate that.
>
>
> To all those who are building a Corvair engine, it's been suggested that
> abrasive blasting with walnuts shells is a great way to get the surfaces
> clean and bright. As I have a sandblaster, I started looking for a
supplier
> of walnut shells. Eastwood (automotive products, etc.) had a 50lb bag for
> $45 plus $30 shipping, I about choked. That seemed to be the same price
for
> all the traditional suppliers. Fortunately, I found a food producer that
> sells walnut products and sells the walnut shells, ground to several
> different sieves, as a byproduct. They are Hammons
> (http://www.black-walnuts.com/) out of Missouri and the 50lb bag was $15
> plus about that for shipping. They took a phone order by credit card, and
> the bag arrived four days later.
>
> I had to explain to the wife when she saw the receipt what the heck I
needed
> 50lbs of walnut shells for.
>
>
> Robert Haines
> Du Quoin, Illinois
>
>
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "Robert Haines" <robertsjunk@hotmail.com>
My Granger catalog only had glass bead. However, my McMaster-Carr catalog
had a number of choices, including walnut shells and corn cob. Walnut shell
was $25.00 for 50lb at 20/30 (the cheapest) and cob at $18.35 for 50lb at
20/40 (also the cheapest). The heavier grit get slightly more expensive.
Shipping is not known.
Thus, my recommendation for Hammons at $15.00 per 50lb bag of walnut shell.
Frustrating thing is that I'm in the middle of corn cob country. You would
think that I could get all I wanted for free if I was willing to pick
through the fields in the Fall and grind it myself. :)
Walt - what were you using cob blasting for and what were your experiences?
Robert Haines
Du Quoin (located between this corn field and that one), Illinois
Message 19
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Subject: | Re: walnut shells and airfoil talk |
--> Pietenpol-List message posted by: "walt evans" <wbeevans@verizon.net>
Robert,
I didn't personly use it, but in talking with our engineering P.E. (who has
since left and is with EASA) The sand grit actually hits and leaves a "barb"
since the sand is much harder that the steel/alum. And it could short out
the laminations on an AC motor. Where the corn cob is softer and either
doesn't touch/flattens the surface on the steel. {{We are one of the
largest electric motor/pump facilities in the northeast (only one ISO 9001
certified first time out)}}
But actually now they've switched to using a high pressure water blaster
that can also add backing soda to the mix for action. (the one where the
operator wears "tim man" shin and foot covers to limit cutting off toes.)
Don't know where cob, walnut shells, and baking soda compare, but just
wanted to bring up another option.
I imagine that if baking soda does the job ( and since it's not an acid,but
a base?)
Like Chris Bobka suggested, it's probably the best way to go.
Besides, when you're done, you can make buscuits. :
)
walt evans
NX140DL
----- Original Message -----
From: "Robert Haines" <robertsjunk@hotmail.com>
Subject: Pietenpol-List: Re: walnut shells and airfoil talk
> --> Pietenpol-List message posted by: "Robert Haines"
<robertsjunk@hotmail.com>
>
> My Granger catalog only had glass bead. However, my McMaster-Carr catalog
> had a number of choices, including walnut shells and corn cob. Walnut
shell
> was $25.00 for 50lb at 20/30 (the cheapest) and cob at $18.35 for 50lb at
> 20/40 (also the cheapest). The heavier grit get slightly more expensive.
> Shipping is not known.
>
> Thus, my recommendation for Hammons at $15.00 per 50lb bag of walnut
shell.
> Frustrating thing is that I'm in the middle of corn cob country. You
would
> think that I could get all I wanted for free if I was willing to pick
> through the fields in the Fall and grind it myself. :)
>
> Walt - what were you using cob blasting for and what were your
experiences?
>
>
> Robert Haines
> Du Quoin (located between this corn field and that one), Illinois
>
>
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