Today's Message Index:
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1. 02:34 AM - Re: Help with Spar Decision (jarheadpilot82)
2. 08:11 AM - Re: Re: Help with Spar Decision (John Woods)
3. 08:18 AM - Re: Sky Scout Plans (DonkDoug)
4. 08:18 AM - Re: Re: Help with Spar Decision (John Woods)
5. 09:36 AM - Re: Help with Spar Decision (jarheadpilot82)
6. 02:18 PM - Re: Help with Spar Decision (johnnysdrop)
7. 02:40 PM - Re: Help with Spar Decision (Bill Church)
8. 04:45 PM - Re: Help with Spar Decision (Ozzietx)
9. 06:44 PM - Re: Re: Help with Spar Decision (Glen Schweizer)
Message 1
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| Subject: | Re: Help with Spar Decision |
"The Jim Will's design has a different strut attachment point on the wing and four
bay's per wing panel rather than three."
John,
I am looking at my Pietenpol plans, specifically, Drawing #5 dated 3/3/34 and
drawn by Orrin Hoopman. I see two bays per wing with the lift strut attach point
at the compression struts and the point where the two bays converge. What plans
show three bays? What plans show four?
Am I missing something?
--------
Semper Fi,
Terry Hand
Athens, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472973#472973
Message 2
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| Subject: | Re: Help with Spar Decision |
Sorry, my mistake. You're correct. I should have written two bays on the
original and three bays on the Will's. My bad. Thanks for the correction
Terry.
On 18 Sep. 2017 17:35, "jarheadpilot82" <jarheadpilot82@hotmail.com> wrote:
jarheadpilot82@hotmail.com>
"The Jim Will's design has a different strut attachment point on the wing
and four bay's per wing panel rather than three."
John,
I am looking at my Pietenpol plans, specifically, Drawing #5 dated 3/3/34
and drawn by Orrin Hoopman. I see two bays per wing with the lift strut
attach point at the compression struts and the point where the two bays
converge. What plans show three bays? What plans show four?
Am I missing something?
--------
Semper Fi,
Terry Hand
Athens, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472973#472973
Message 3
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| Subject: | Re: Sky Scout Plans |
Oscar,
Those are some interesting numbers you came up with. And I'm glad to know my math
was not too far off!
Doug
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472983#472983
Message 4
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| Subject: | Re: Help with Spar Decision |
I should emphasize though that the different strut attachment point in the
Will's design still stands and should be taken into consideration if using
his soar design. It would be wise NOT to use his spar design unless you are
building from his wing design.
JohnW
On 18 Sep. 2017 23:09, "John Woods" <jawesma@gmail.com> wrote:
> Sorry, my mistake. You're correct. I should have written two bays on the
> original and three bays on the Will's. My bad. Thanks for the correction
> Terry.
>
> On 18 Sep. 2017 17:35, "jarheadpilot82" <jarheadpilot82@hotmail.com>
> wrote:
>
> jarheadpilot82@hotmail.com>
>
> "The Jim Will's design has a different strut attachment point on the wing
> and four bay's per wing panel rather than three."
>
> John,
>
> I am looking at my Pietenpol plans, specifically, Drawing #5 dated 3/3/34
> and drawn by Orrin Hoopman. I see two bays per wing with the lift strut
> attach point at the compression struts and the point where the two bays
> converge. What plans show three bays? What plans show four?
>
> Am I missing something?
>
> --------
> Semper Fi,
>
> Terry Hand
> Athens, GA
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=472973#472973
>
>
Message 5
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| Subject: | Re: Help with Spar Decision |
John,
No worries. I just wanted to make sure that I was reading the correct set of plans.
I agree with you that is not a good idea to combine different plans and methods
for such critical items a spars and wing design. Without having the ability or
the funds to pay someone with the ability to analyze the proposed combination,
I would caution someone before doing so.
--------
Semper Fi,
Terry Hand
Athens, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472988#472988
Message 6
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| Subject: | Re: Help with Spar Decision |
Ozzietx
I am using the Jim Wills design wing and have built the spars, it is straightforward.
Of note this design is not a box spar, it has a full ply backing on 1 face only
and the
other face has ply where there is blocking.
Also of note this is a 3 piece wing and must use a front jury strut.
Please note this design is used in conjunction with the Hoopman drawings for the
remainder of the aeroplane.
Regards
English Johnny
--------
The only way is UP
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472996#472996
Message 7
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| Subject: | Re: Help with Spar Decision |
One other point to keep in mind, regarding the UK spar design is that it is to
be used in conjunction with the leading edge 1/16" plywood wrapping from the top
of the front spar all the way around the leading edge, to the bottom of the
front spar (practically creating D-cell), as opposed to the original Pietenpol
plans which only have the plywood skin on the top side. This added leading
edge ply likely is a significant contributor to the claims of being "stronger".
The overall weight of the built-up spar, plus the extra leading edge ply is not
significantly lighter than the original routed Spruce spars with original leading
edge ply. Cost-wise, there also isn't much savings to be had, in North America,
at least. Likely a different story in other parts of the world.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472997#472997
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| Subject: | Re: Help with Spar Decision |
I want to thank everyone for their responses.
Since I can get S2 spar spruce in Houston for around $11 Bd Ft,
and I have the ability to rip, and plane that stock,
I think I'll just go with routed 1" spars.
I really appreciate all of the input though, it has been educational.
I did not realize that the Jim Wills spar was part of a structural re-design of
the original wing.
While I like the design, I will just keep doing what I hear.
Just build it like Bernard designed it.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472998#472998
Message 9
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| Subject: | Re: Help with Spar Decision |
That's The smartest thing I've heard yet in this discussion. I'm fortunate in that
I build Stearman biplanes for a living do you realize that the main spar in
a stearman wing has the same dimensions as what Mr Pietenpol calls for in his
wing?
The story is that WWII instructors would try to break them by overstressing
in a dive. It couldn't be done. Stearman spars aren't routed like what you're
talking about but that was more of a manufacturing process issue than caring
about saving a little weight
One other curiosity as a testament to just how robust the pietenpol really
is. Stearman cap strips:7/32 square 1/16 gussets. Pietenpol capstrips:1/2 X1/4.
Centers about the same. Same warren truss beefier nose rib gussets aluminum
sheeted l.e.for Stearman
> On Sep 18, 2017, at 4:44 PM, Ozzietx <ozzietx@gmail.com> wrote:
>
>
> I want to thank everyone for their responses.
> Since I can get S2 spar spruce in Houston for around $11 Bd Ft,
> and I have the ability to rip, and plane that stock,
> I think I'll just go with routed 1" spars.
>
> I really appreciate all of the input though, it has been educational.
>
> I did not realize that the Jim Wills spar was part of a structural re-design
of the original wing.
>
> While I like the design, I will just keep doing what I hear.
>
> Just build it like Bernard designed it.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=472998#472998
>
>
>
>
>
>
>
>
>
.
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