Today's Message Index:
----------------------
1. 07:05 AM - Jim Wills wing (Oscar Zuniga)
2. 07:17 AM - Re: Jim Wills wing (Peter W Johnson)
3. 07:24 AM - Riblett 30U-612 airfoil (Oscar Zuniga)
4. 08:30 AM - Re: PVC clamps (Kirk Huizenga)
5. 08:50 AM - Jim Wills wing (Oscar Zuniga)
6. 09:43 AM - Re: Gusset questions (Barry Davis)
Message 1
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Tim; I believe the "Jim Wills wing" is the built-up spar design that the UK authorities
approved and that is used by most/all of the UK builders. It is a box
spar with top and bottom spar caps, a plywood shear face, and filler pieces
at the tip, root, and lift strut attach points as well as having vertical stiffeners
along the length of it. The beauty of it is that it can be built at much
lower cost than solid or routed spars, using shorter pieces of wood. It is
probably lighter as well.
The designer has been unwilling to sell plans for the spar into the US, I guess for liability reasons. There is a picture at http://www.flysquirrel.net/piets/boxspar.jpg
Oscar Zuniga
Air Camper NX41CC
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
Message 2
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Oscar,
I like the picture. Must be one of my better ones!!!
Cheers
Peter
Wonthaggi Australia
http://www.cpc-world.com
-----Original Message-----
From: owner-pietenpol-list-server@matronics.com
[mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of Oscar Zuniga
Sent: Saturday, 3 May 2008 12:02 AM
Subject: Pietenpol-List: Jim Wills wing
Tim; I believe the "Jim Wills wing" is the built-up spar design that the UK
authorities approved and that is used by most/all of the UK builders. It is
a box spar with top and bottom spar caps, a plywood shear face, and filler
pieces at the tip, root, and lift strut attach points as well as having
vertical stiffeners along the length of it. The beauty of it is that it can
be built at much lower cost than solid or routed spars, using shorter pieces
of wood. It is probably lighter as well.
The designer has been unwilling to sell plans for the spar into the US, I
guess for liability reasons. There is a picture at
http://www.flysquirrel.net/piets/boxspar.jpg
Oscar Zuniga
Air Camper NX41CC
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
Checked by AVG.
5:30 PM
Checked by AVG.
5:30 PM
Message 3
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| Subject: | Riblett 30U-612 airfoil |
Tim;
The Riblett "612" airfoil is very similar to the NACA 4412 airfoil that has
also been discussed here. Both of those airfoils are deeper than the Piet
enpol, allowing for lighter spars and ribs, increased volume where a fuel t
ank can go in the wing, and both of them have less undercamber than the Pie
tenpol airfoil. With a 60" chord, a 12% airfoil is a bit over 7" deep as c
ompared with the Pietenpol at 4" deep. Mike Shuck has done somewhat of an
analysis of them vs. the Pietenpol airfoil and there are some benefits to u
sing one or the other.
There is an image of the NACA and Riblett airfoils at http://www.flysquirre
l.net/piets/airfoils.jpg and you can see for yourself roughly what they loo
k like. For our purposes, the two are essentially equal and I think either
would compare to the Pietenpol airfoil in the same ways.Oscar Zuniga
Air Camper NX41CCSan Antonio, TXmailto: taildrags@hotmail.comwebsite at htt
p://www.flysquirrel.net
Message 4
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Hmm, not sure why the text didn't make it last two attempts
This is a test
Do not archive
On May 1, 2008, at 7:58 PM, Richard Schreiber wrote:
> I made a bunch of PVC clamps a while ago and used them extensively
> on my wing. They really do work well !!! I used a larger pipe size
> (6 inch I think) and then made clamps of various widths to control
> clamp pressure.
>
> Rick Schreiber
>
>
> ----- Original Message -----
> From: KMHeide, BA, CPO, FAAOP
> To: pietenpol-list@matronics.com
> Sent: 5/1/2008 4:13:56 PM
> Subject: RE: Pietenpol-List: Gusset questions
>
> MIchael...
>
> Excellent idea!! I am off to the hardware store for some PVC. I
> will start making some tomorrow!
>
> Ken
>
> Michael Silvius <silvius@gwi.net> wrote:
> Ken:
>
> Not sure if it is common knowledge here but I thought I pass this
> on about
> making cheap clamps. Boat building like airplane building often
> requires
> lots of them.
>
> Run a piece of 2 or 3 inch PVC schedule 40 down a table saw and cut
> one wall
> through, then chop it in to 1 inch wide doughnuts. You can make a
> bucket
> full of clamps for pennies.
>
> Michael
>
>
> Kenneth M. Heide, BA, CPO, FAAOP
>
>
> Be a better friend, newshound, and
>
Message 5
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Peter wrote-
>I like the picture. Must be one of my better ones!!!
I'm an equal opportunity photo thief, mate. I'll steal anything from anybody ;o)
Oscar Zuniga
Air Camper NX41CC
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
Message 6
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| Subject: | Re: Gusset questions |
Don't forget to sand the whole sheet before cutting. You'll figure out
why...if you don't.
Barry
----- Original Message -----
From: "Ryan Mueller" <rmueller23@gmail.com>
Sent: Thursday, May 01, 2008 8:24 AM
Subject: Pietenpol-List: Gusset questions
> <rmueller23@gmail.com>
>
> A couple of questions about the gussets on the wing ribs....
>
> I have the full size rib print, although I didn't use it to layout the
> jig. I'm cutting pieces of thin cardboard to match the gussets as shown on
> the full size print, and then I'll use those patterns for cutting gussets
> from the sheet of 1.5mm birch ply we bought from AS&S. Are there any
> discrepancies in the gussets as shown on the full size print?
>
> The top gusset on the rear spar upright is a rather odd shape, insofar as
> how it extends down the 45 degree rib member. I wonder if it would be
> better to just extend it out to be a full square so it might be a little
> stronger. Of course, then I look at it and think that if it needed to be
> that way then it would have been drawn that way. :P
>
> Otherwise I think I've found most of the posts on the other things to be
> careful of: scuffing the birch before gluing, cut the gussets out so you
> have vertical grain orientation. I was thinking of using weights on the
> gussets and leaving the rib in the jig overnight to dry. Stapling (and
> removing the staples later) sounded good as well, speeding up the process,
> but I worry about having the gusset shift when the staple is driven in. Is
> this a concern?
>
> Thanks for the help,
>
> Ryan
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=180454#180454
>
>
>
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