Based on a section modulus of 18.5 in3 and yield strength of spruce at 5000
Psi, the center spar should yield at 92500 lb in. bending moment. I don't
know how that translates to wing load.
On Feb 22, 2015 4:58 PM, wrote:
>
> Just an idea. We have a gathering coming up in September. I would
imagi
That would be great!
On Feb 22, 2015 6:07 PM, "Paul-Visk via KRnet" wrote:
>
>
> Just an idea. We have a gathering coming up in September. I would
imagine
> there is a set of fwd spars lying around gathering dust somewhere. If we
> can get them to McMinnville with some sandbags and do our on
On Sun, Feb 22, 2015 at 1:29 AM, Flesner via KRnet
wrote:
>
>>
>> The Spreadsheet says we should be using aluminum spars to make more
>> than 2G load factors.
>
>
>
> It's been a long held belief that the WAF's were the weak point i
Just an idea. We have a gathering coming up in September. I would imagine
there is a set of fwd spars lying around gathering dust somewhere. If we
can get them to McMinnville with some sandbags and do our on test. I would
be willing to pitch in to help defray the cost.
I might be able
Hello netters,over here in Germany ,I had to do a spar and WAF load test for my
Kr. Mr. Otto Bartsch from the OUV(the German association for experimentals and
a aerodynamic ingeneer at Messerschmitt Boelkow Blohm (MBB) did a very simple
but efficient Job.To demonstrate the strength of the spars
At 07:41 PM 2/21/2015, you wrote:
>has the strength ever been questioned of this design, spars or
>anything else?
+
Yes, many times by many people, especially the WAF's, but nothing to
do with actual aircraft has indicated any structural we
> The complete test was very successful. The very slightly bent on
> the WAF's ( pic far right) was the result of a not calculable load
> (more than 7 g's supposed by Otto Bartsch)
+
> Im studying beam theory and i wanted to see if i understood the math.
>> I was trying to see how the design is doing with the latest take off
>> weights.
>> I'm surprised by the results.
>> Thank you Mark!
>
> +++
>
> Surprised good or surpr
has the strength ever been questioned of this design, spars or anything else?
On Sat, Feb 21, 2015 at 7:00 PM, Chris Prata via KRnet
wrote:
> What is this about, calculating spar strength?
> Does address attach fitting too? (Although I believe I saw a video that they
> break after the spar?)
>
Im studying beam theory and i wanted to see if i understood the math.
I was tr
>
>The Spreadsheet says we should be using aluminum spars to make more
>than 2G load factors.
It's been a long held belief that the WAF's were the weak point in
the KR spars. I've had the opportunity to inspect 3 crashed KR's,
un
Larry Flesner wrote:
> Roberts did his share of real world testing and lived to tell about
it. My hero. :-)
Yep, there's no substitute for real-world testing, and Marty has
certainly done that with his KR2.
Also, analyze the scenario at
http://www.krnet.org/mvn2008/080921256.jpg. This is re
Has anyone tried computing the section modulus of the front center spar?
Im not sure if I got it right.
What values in SI units are you getting?
Thank you in advance.
>
> > What is this about, calculating spar strength?
> > Does address attach fitting too? (Although I believe I saw a
> video that they break after the spar?)
> >>
>Im studying beam theory and i wanted to see if i understood the math.
>I was try
What is this about, calculating spar strength?
Does address attach fitting too? (Although I believe I saw a video that they
break after the spar?)
DOSBOX is (free I think) software that runs under Win 7 or any late model
Windows and within it you can run legacy programs like the one mentioned b
Rogelio Serrano wrote:
>> Has anyone tried computing the section modulus of the front center
spar? What values in SI units are you getting?<<
I did that calc a long time ago, but I was too lazy to do it the hard
way. I got something called "SPARANA.exe" to do that for me. It was
pretty simpl
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