KR> Re: KR2 spars

[Phillip E. Harrison]

Greg,   
I am working on a kr2 project. I brought it to University of Alabama
where the engineering guru's and their students are using it as a learning
tool.
One of the things they are exploring is composite spars with
removable out board wing sections using the as5048/46. They will build wing
spar with wing attach to test. I will be glad to share the results.
They also have decided to go with retractable gear. So I can offer
you / ( kr netters) the fixed gear, wheels...
Question: I see there is a combined 48/45 wing template set has
anyone built a 48/46?   Does anyone have insight/suggestions on this
combination?
Phillip 

-Original Message-
From: krnet-bounces+mistion=earthlink@mylist.net
[mailto:krnet-bounces+mistion=earthlink@mylist.net] On Behalf Of smwood
Sent: Monday, November 14, 2011 9:05 AM
To: kr...@mylist.net
Subject: KR> Re: KR2 spars

The Lancair 320/360 and the Pulsar XP have all composite construction, fuel 
in the wings and removable wings.  The Lancair wing spars are attached with 
only two bolts for both wings at the two common attachment points inside the

fuselage.

Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA
smw...@md.metrocast.net


--
Hi Dave

Many thanks the reply. I am well familiar with the KR2 Super and its 
website, have been studying it since February of this year as well as many 
other KR builders sites.

I like the KR2Super very much and building with composites is no problem for

me - been doing for about ten years for model RC planes ( a different story 
but composites are not new to me). As usual one sets out with a plan and a 
list of desires which normally are not fulfilled in every way by existing 
designs - in other words one tends to like different things about different 
designs but never finds the "ultimate solution". So I want a two seat, side 
by side and homebuilt from plans. It would be great if it could fit into LSA

limits (again a wishful thought). That led me to KR and the KR2S. Further 
research led me to alternative materials due to wood availability in my 
country. I found the KR Super and got excited.

Trouble for me though is I want the original wing design with WAF's, fixed 
undercarriage, fuel tanks in the stub wings and I want to put it onto a 
trailer to take home in winter and save storage cost for fuel! Scott's KR2 
Super does not allow for this with his spar design. I also like the way Mark

has rebuilt his wings - from the fotos it is a far simpler construction the 
the Supers but he used "beefed up" woodens spars.

I also find nothing difficult/complicated about the Supers spar design - 
website has excellent instructions, very good foto's and if followed 
correctly and taking care with the layups and methods an easy part to make.

I am by no means a designer and would be lying if I said I understood half 
the technical discussion on spar design so was hoping to compare what I have

found out and worked with to someone else who may be more familiar with the 
design aspects of a spar.

So back to my original question/query - has anyone designed alternative 
composite wing spars using the original WAF's mountings design idea?

thanks again

Greg
--




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KR> Re: KR2 spars

[smwood]

The Lancair 320/360 and the Pulsar XP have all composite construction, fuel 
in the wings and removable wings.  The Lancair wing spars are attached with 
only two bolts for both wings at the two common attachment points inside the 
fuselage.

Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA
smw...@md.metrocast.net

--
Hi Dave

Many thanks the reply. I am well familiar with the KR2 Super and its 
website, have been studying it since February of this year as well as many 
other KR builders sites.

I like the KR2Super very much and building with composites is no problem for 
me - been doing for about ten years for model RC planes ( a different story 
but composites are not new to me). As usual one sets out with a plan and a 
list of desires which normally are not fulfilled in every way by existing 
designs - in other words one tends to like different things about different 
designs but never finds the "ultimate solution". So I want a two seat, side 
by side and homebuilt from plans. It would be great if it could fit into LSA 
limits (again a wishful thought). That led me to KR and the KR2S. Further 
research led me to alternative materials due to wood availability in my 
country. I found the KR Super and got excited.

Trouble for me though is I want the original wing design with WAF's, fixed 
undercarriage, fuel tanks in the stub wings and I want to put it onto a 
trailer to take home in winter and save storage cost for fuel! Scott's KR2 
Super does not allow for this with his spar design. I also like the way Mark 
has rebuilt his wings - from the fotos it is a far simpler construction the 
the Supers but he used "beefed up" woodens spars.

I also find nothing difficult/complicated about the Supers spar design - 
website has excellent instructions, very good foto's and if followed 
correctly and taking care with the layups and methods an easy part to make.

I am by no means a designer and would be lying if I said I understood half 
the technical discussion on spar design so was hoping to compare what I have 
found out and worked with to someone else who may be more familiar with the 
design aspects of a spar.

So back to my original question/query - has anyone designed alternative 
composite wing spars using the original WAF's mountings design idea?

thanks again

Greg
--

KR> RE: KR2 spars

[Gregory Moss]

Hi Dave

Many thanks the reply. I am well familiar with the KR2 Super and its website, 
have been studying it since February of this year as well as many other KR 
builders sites.

I like the KR2Super very much and building with composites is no problem for me 
- been doing for about ten years for model RC planes ( a different story but 
composites are not new to me). As usual one sets out with a plan and a list of 
desires which normally are not fulfilled in every way by existing designs - in 
other words one tends to like different things about different designs but 
never finds the "ultimate solution". So I want a two seat, side by side and 
homebuilt from plans. It would be great if it could fit into LSA limits (again 
a wishful thought). That led me to KR and the KR2S. Further research led me to 
alternative materials due to wood availability in my country. I found the KR 
Super and got excited.

Trouble for me though is I want the original wing design with WAF's, fixed 
undercarriage, fuel tanks in the stub wings and I want to put it onto a trailer 
to take home in winter and save storage cost for fuel! Scott's KR2 Super does 
not allow for this with his spar design. I also like the way Mark has rebuilt 
his wings - from the fotos it is a far simpler construction the the Supers but 
he used "beefed up" woodens spars.

I also find nothing difficult/complicated about the Supers spar design - 
website has excellent instructions, very good foto's and if followed correctly 
and taking care with the layups and methods an easy part to make.

I am by no means a designer and would be lying if I said I understood half the 
technical discussion on spar design so was hoping to compare what I have found 
out and worked with to someone else who may be more familiar with the design 
aspects of a spar.

So back to my original question/query - has anyone designed alternative 
composite wing spars using the original WAF's mountings design idea?

thanks again

Greg
--

Message: 4
List-Post: krnet@list.krnet.org
Date: Fri, 11 Nov 2011 11:06:44 -0600
From: "Dave McCauley" 
Subject: RE: KR> KR2 spars
To: "'KRnet'" 
Message-ID: <000901cca094$4a7a6140$df6f23c0$@comcast.net>
Content-Type: text/plain;   charset="us-ascii"

Greg,

I'm building a KR Super2 which is an all composite derivative of the KR2S.
The main spar has a core of 1/2 inch last-a-foam sandwiched with multiple
layers of fiberglass and has spar caps of carbon-fiber rod.  The
construction is complicated and goes very slowly.  It is strong but only 1
inch thick so replacing the wood KR2S box structure wouldn't be easy and
mounting the landing gear would also require much work.  So, I believe you'd
be much better off building the spar per KR2 plans.  If you like to learn
more about building the KR Super2  go to www.krsuper2.com

Dave McCauley