Today's Message Index:
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1. 08:00 AM - Christmas book idea (Oscar Zuniga)
2. 10:43 AM - brass tarnish (Oscar Zuniga)
3. 11:10 AM - Re: brass tarnish (harvey rule)
4. 04:19 PM - Re: brass tarnish (Michael McCarty)
5. 06:34 PM - building video (Oscar Zuniga)
6. 07:24 PM - Re: building video (Rick Holland)
7. 09:00 PM - Re: building video ()
8. 10:29 PM - Re: building video (Rcaprd@aol.com)
9. 10:54 PM - Re: pesky elevator cable (Philip Miller)
Message 1
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Subject: | Christmas book idea |
--> Pietenpol-List message posted by: "Oscar Zuniga" <taildrags@hotmail.com>
For those who might be looking for a stocking stuffer book idea, try Russell
Hitt's book "Jungle Pilot" (available from Amazon.com, among others).
Corvair/KR builder-pilot Bill Clapp would certainly know what this book is
about; the life of missionary pilot Nate Saint, a pilot with Missionary
Aviation Fellowship who died in Ecuador. If you've looked at Glenda
McElwee's website, she mentions a trip that she and Bill are planning to
fly, down to Ecuador. Bill is familiar with that part of the world!
Nate Saint developed an ingenious backup fuel system for use in small,
single-engine aircraft that are flown over inhospitable terrain. Missionary
Aviation Fellowship used this system on aircraft that they operated, and for
all I know they may still be using it. Nate felt that there were enough
incidents and accidents caused by fuel system problems that a backup system
was justified, so he developed a scheme that uses a small auxiliary fuel
tank piped directly to the engine intake, bypassing the fuel selector valve,
gascolator, and everything else that can get crudded up along the way. It's
controlled by a manual valve, similar to mixture control.
He also developed an ingenious way to lower things from a circling airplane
to the ground below, using a line and bucket, but that would be giving away
the details in the book... ;o)
Oscar Zuniga
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
Message 2
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--> Pietenpol-List message posted by: "Oscar Zuniga" <taildrags@hotmail.com>
For those of you who may have brass radiator parts or brass near the engine,
I understand that brass will tarnish quicker if it's subjected to higher
temperatures (such as on the radiator). Is this the case? Is there any way
to keep it shiny other than frequent polishing with Brasso or equivalent?
Thanks.
Oscar Zuniga
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
Message 3
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Subject: | Re: brass tarnish |
--> Pietenpol-List message posted by: harvey rule <harvey.rule@bell.ca>
I have urathaned(not sure of spelling) brass in order to keep it shiny.I
have no idea how that would react to the heat though.Did a fine job on
my post box.Brass gets tarnished from oxidization.Keep that away and you
got something.Oxygen buggers everything up sooner or later.
Oscar Zuniga wrote:
>
> --> Pietenpol-List message posted by: "Oscar Zuniga" <taildrags@hotmail.com>
>
> For those of you who may have brass radiator parts or brass near the engine,
> I understand that brass will tarnish quicker if it's subjected to higher
> temperatures (such as on the radiator). Is this the case? Is there any way
> to keep it shiny other than frequent polishing with Brasso or equivalent?
>
> Thanks.
>
> Oscar Zuniga
> San Antonio, TX
> mailto: taildrags@hotmail.com
> website at http://www.flysquirrel.net
>
>
>
>
>
Message 4
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Subject: | Re: brass tarnish |
--> Pietenpol-List message posted by: "Michael McCarty" <mmccarty@zianet.com>
> For those of you who may have brass radiator parts or brass near the engine,
> I understand that brass will tarnish quicker if it's subjected to higher
> temperatures (such as on the radiator). Is this the case? Is there any way
> to keep it shiny other than frequent polishing with Brasso or equivalent?
I doubt that the usual lacquer or urethane clear coats would stand up to the
radiator heat. My wife would say to polish it with olive oil, but I'm sure
that would attract dust. You might want to try a good automotive paste
wax.
-Mac
Message 5
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--> Pietenpol-List message posted by: "Oscar Zuniga" <taildrags@hotmail.com>
I realize I've about worn out my welcome here, but I note one more item that
could be mentioned.
To locate the mounting position of the elevator bellcrank behind the pilot's
seat, on Dwg. #1 (dated 1-19-33 in my plans set), the centerline of the
pivot shaft is dimensioned as 7" up from the lower edge of the lower
longeron. On Dwg. #4 (dated 2-26-34) the detail of the same bellcrank shows
that dimension as 9". Is there a 2" discrepancy, or am I missing something?
If you use pulleys under the pilot's seat to direct the elevator cables to
the bellcrank (rather than holes drilled in the seat framing), go for the
higher mounting location for the bellcrank shaft if you're looking to avoid
having the aileron cables rub on the LE of the horiz. stabilizer. As a
matter of fact, if anyone is interested in what it takes to change the
geometry to eliminate the "pesky elevator cable" problem, I've drawn it up
in AutoCAD to illustrate the problem and I can post some images on my
website. For those who have the video of Chuck's Piet flying and having
fun, watch the elevator cables as Chuck puts his airplane through its paces
and he shows you the view out the back. He has some sort of anti-chafe tape
on the LE of his HS where the cables contact it. Note also the differential
tension (or slack) in the upper and lower cables... all of which can be
eliminated by making some slight dimensional changes in the bellcrank and
its mounting position. Nevertheless... there is that 2" discrepancy between
the mounting locations shown on two different plan sheets.
Merry Christmas to all you low 'n' slow fliers...
Oscar Zuniga
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
Message 6
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Subject: | Re: building video |
Never noticed the 2" difference until you mentioned it Oscar. I guess I was
looking at drawing #4 the day I installed my bellcrank (fortunately). How
high do you place it to eliminate the cable problem?
Rick H.
On 12/19/05, Oscar Zuniga <taildrags@hotmail.com> wrote:
>
> --> Pietenpol-List message posted by: "Oscar Zuniga" <
> taildrags@hotmail.com>
>
> I realize I've about worn out my welcome here, but I note one more item
> that
> could be mentioned.
>
> To locate the mounting position of the elevator bellcrank behind the
> pilot's
> seat, on Dwg. #1 (dated 1-19-33 in my plans set), the centerline of the
> pivot shaft is dimensioned as 7" up from the lower edge of the lower
> longeron. On Dwg. #4 (dated 2-26-34) the detail of the same bellcrank
> shows
> that dimension as 9". Is there a 2" discrepancy, or am I missing
> something?
>
> If you use pulleys under the pilot's seat to direct the elevator cables to
> the bellcrank (rather than holes drilled in the seat framing), go for the
> higher mounting location for the bellcrank shaft if you're looking to
> avoid
> having the aileron cables rub on the LE of the horiz. stabilizer. As a
> matter of fact, if anyone is interested in what it takes to change the
> geometry to eliminate the "pesky elevator cable" problem, I've drawn it up
> in AutoCAD to illustrate the problem and I can post some images on my
> website. For those who have the video of Chuck's Piet flying and having
> fun, watch the elevator cables as Chuck puts his airplane through its
> paces
> and he shows you the view out the back. He has some sort of anti-chafe
> tape
> on the LE of his HS where the cables contact it. Note also the
> differential
> tension (or slack) in the upper and lower cables... all of which can be
> eliminated by making some slight dimensional changes in the bellcrank and
> its mounting position. Nevertheless... there is that 2" discrepancy
> between
> the mounting locations shown on two different plan sheets.
>
> Merry Christmas to all you low 'n' slow fliers...
>
> Oscar Zuniga
> San Antonio, TX
> mailto: taildrags@hotmail.com
> website at http://www.flysquirrel.net
>
>
>
>
--
Rick Holland
Message 7
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Subject: | Re: building video |
From experience I can tell you that raising the bellcrank 1 inch is NOT enough
to allow the cables to clear the stabilizer.
Greg Cardinal
----- Original Message -----
From: Rick Holland
Never noticed the 2" difference until you mentioned it Oscar. I guess I was looking
at drawing #4 the day I installed my bellcrank (fortunately). How high
do you place it to eliminate the cable problem?
Rick H.
Message 8
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Subject: | Re: building video |
I built my bellcrank to the '34 plans location, Dwg. #4 (dated 2-26-34)
with the 9" call out, and used a piece of thick leather on the L.E. of the
horizontal stab as the anti-chafe. That's what Oscar saw in the video. I also
used a piece of hardwood under the seat, where the stick to bellcrank cables
change direction...no pulleys. I chose the plans method, because it was simple,
it has worked on so many other planes over the years, and didn't want to
spend all the time and effort to change the design...just "Git 'er done".
It has always been my opinion, however, that if there was one place in
the design of the Pietenpol that could be improved, this is it. None of the
control surfaces are mass balanced, and the possibility of flutter has always
concerned me, especially with so much slack in the lower cable with the flippers
in the neutral position. Having said that, I've had my plane over 100 mph
indicated in a shallow dive, and with the ASI error removed, it was probably more
like 110 mph. Absolutely NO flutter was indicated, even with the design
slack in the lower flipper cable. We (Lynn Knoll and I) were at gross weight,
and
chasing a confounded streamer of Toilet Paper !! Hey Lynn...did you know
we were on a test flight ??? :)
Chuck G.
NX770CG
Message 9
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Subject: | Re: pesky elevator cable |
Thanks Oscar! John's "Mountain Piet" was just what I was looking for, at least
for the elevator system. The workmanship on that plane is awesome (and I use
that word in it's dictionary sense).
I've looked at the Brit page before and it is very good. I particularly like the
way they often combine spoked wheels with tubed LG. That just makes a lot
of sense to me.
You guys are great for coming up with the answers.
Phil Miller
Altadena, CA
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