Does anyone on the list here have a set of drawings for the spars for a
Kr2S either original or the newer airfoil? DXF/PDF/DWG/Solidworks or IGS
anything is fine.
Thanks
Stan
---
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__
maybe winglets in the future so I wanted something strong to attach
them. Others might have different reasons.
Original Message
Subject: Re: KR> SPARS and extended wing span
From: Paul Visk
List-Post: krnet@list.krnet.org
Date: Thu, April 17, 2014 10:34 am
To: Gary Robi
Subject: Re: KR> SPARS and extended wing span
From: Paul Visk
List-Post: krnet@list.krnet.org
Date: Thu, April 17, 2014 10:34 am
To: Gary Robison , krnet at list.krnet.org
I'm just curious. Why not go with the foam spar extensions instead of
extending the spars with wood. The foam is lighter a
ssage From: Gary Robison
Date:04/16/2014 3:12 PM (GMT-06:00)
To: krnet at list.krnet.org Subject: KR> SPARS and
extended wing span
Larry here is a picture of my spar caps and the
2 foot pieces scarfied on.
>
___
Search the KRnet Archi
Larry here is a picture of my spar caps and the
2 foot pieces scarfied on.
1 foot for the 2s 1 foot extended
With the scarfs running in opposite directions and
the spruce ply web covering both sides I think
this will be plenty strong. The original use foam
and a couple of layer of glass.
As for
At 09:00 AM 11/11/2010, you wrote:
>I was thinking by "solid spare" he meant the wings would not be
>detachable.
+
You're probably right. Like I said, "my imagination is a bit fuzzy
this morning".
Larry Flesner
I was thinking by "solid spare" he meant the wings would not be
detachable.
Todd thelin
In a message dated 11/11/2010 6:38:52 A.M. Pacific Standard Time,
fles...@frontier.com writes:
How will a solid spar give you more room in the wing than the box
spar called for in the plans?
At 08:29 AM 11/11/2010, you wrote:
>I'm not worried about losing stub wing as I am going to be going with
>a solid spar on my kr1. Should create anough space within the wings to
>move stuff around a bit.
++
How will a solid spar give you
Thanks for everyones help on the spar fitting and cad files, much
appreciated.
Chris Johnston
HI,
How is everyone covering there outer spars? Both sides or how they
show you to do it in the Kr manual? I seen on some peoples sites they do both
sides. For strength?
David Swanson
bdazzca...@aol.com
>How is everyone covering there outer spars? Both sides or how they
>show you to do it in the Kr manual? I seen on some peoples sites they do
>both
>sides. For strength?
David:
Per KR-2S Spar Details drawing W1:
"NOTE: Both Fore and Aft Outboard Spars
have 2.5mm Ply on both face
Follow the manual. It is cheaper, and faster, Virg
On Mon, 8 May 2006 00:24:20 EDT bdazzca...@aol.com writes:
> HI,
>
>How is everyone covering there outer spars? Both sides or how
> they
> show you to do it in the Kr manual? I seen on some peoples sites
> they do both
> sides
To: "KRnet"
Sent: Saturday, January 14, 2006 9:45 AM
Subject: RE: KR> Spars
>
>>. I, personally, do not think that scarfing is any fun and find it
>>most diff
Isn't it interesting, this thread has nothing to do with spars. I have seen
several posts in response to my post on "anti scarfing", and while I
appreciate all the "how to scarf" replies, and the one that told me to quit
building airplanes, my intent was to see if technology had changed to the
ext
-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Larry&Sallie Flesner
Sent: Saturday, January 14, 2006 9:46 AM
To: KRnet
Subject: RE: KR> Spars
>. I, personally, do not think that scarfing is any fun and find it
>most difficult to g
When I built my first plane back in "74" I came across a sanding disk that
Sears, sold.
This disk is an 8" disk with a 2 degree taper from center to edge on one
side and flat on the other. The idea was that if you put it into the table saw
and angled the disk 2 degrees, it would then be strai
To fit the spar webs I figure I need about 8 ft by 35 inches surface area
of ply to cover all the spars, I would assume the grain in a 8 ft length runs
lengthwise in the sheet, the plans MAKE A POINT of noting the grain to run
vertically, so my question is what do most people do, cut 4 ft
> the plans MAKE A POINT of noting the grain to run vertically, so
> my question is what do most people do, cut 4 ft lengths and scarf together?
Yes, or two foot lengths, or whatever
> anyone know of any type of sending unit which will fit into such a
> small hole? Th
rian Kraut
Engineering Alternatives, Inc.
www.engalt.com
-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Chris Johnston
Sent: Friday, January 13, 2006 6:24 AM
To: KRnet
Subject: KR> Spars
To fit the spar webs I figure I need abo
> To fit the spar webs I figure I need about 8 ft by 35 inches surface
> area of ply to cover all the spars, I would assume the grain in a 8 ft
> length runs lengthwise in the sheet, the plans MAKE A POINT of
> noting the grain to run vertically, so my question is what do most
> people do, cu
Chris said;
Tending to think that a welded 2-3 mil alumimium tank might be the
most crash resistant/puncture proof thing available, around about 70
litres/ 15 gallon capacity, any comments?
Yes; Aluminum foil is 2-3 mils. I don't think that would pass
inspection.
Ron Freiberger
mail to ron
> Chris said;
> Tending to think that a welded 2-3 mil alumimium tank might be the
> most crash resistant/puncture proof thing available, around about 70
> litres/ 15 gallon capacity, any comments?
>
> Yes; Aluminum foil is 2-3 mils. I don't think that would pass
> inspection.
>
> Ron Freiber
t
>To: "'KRnet'"
>Subject: RE: KR> Spars
>Date: Fri, 13 Jan 2006 10:40:24 -0500
>
>Chris said;
> Tending to think that a welded 2-3 mil alumimium tank might be the
>most crash resistant/puncture proof thing available, around about 70
>litres/ 15 gall
t
>To: "'KRnet'"
>Subject: RE: KR> Spars
>Date: Fri, 13 Jan 2006 10:40:24 -0500
>
>Chris said;
> Tending to think that a welded 2-3 mil alumimium tank might be the
>most crash resistant/puncture proof thing available, around about 70
>litres/ 15 gall
Think he meant milimeters.
Brian Kraut
Engineering Alternatives, Inc.
www.engalt.com
-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Steve Bray
Sent: Friday, January 13, 2006 1:54 PM
To: kr...@mylist.net
Subject: RE: KR> Spars
I wo
I'm sure he did and I feel bad about ribbing him, sorry again Chris.
Just what does mil mean like on the thickness of a trash bag?
How many thousands in a mil?
Steve Bray
Jackson, Tennessee
>From: "Brian Kraut"
>Reply-To: KRnet
>To: "KRnet"
>Subject: RE:
> Just what does mil mean like on the thickness of a trash bag?
> How many thousands in a mil?
The boxes of plastic sheeting I use at work state that they are 3 mil
(.003") thick poly plastic.
1 mil equals .001"
Brant Hollensbe
DSM
Thanks Brant
I guess I missed that in machine shop class, I also missed gage haveing to
do with sheet metal.
I'm sure it's in my machinist handbook somewhereif I could find that.
Steve Bray
Jackson, Tennessee
>
>
>
>
>
>
>
>___
>Search the KRnet Archives
>The boxes of plastic sheeting I use at work state that they are 3 mil
>(.003") thick poly plastic.
>1 mil equals .001"
And 1 millimeter equals .039", so 2 mil plate at .078" is probably overkill.
Per Dana Overall's wing tank construction article,
http://www.krnet.org/wingtank/ he used .032" 20
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what a wally is. I
think lockheed and the Queen Mary are both around there somewhere as well.
- Original Message -
From: "Ron Freiberger"
To: "'KRnet'"
Sent: Saturday, January 14, 2006 2:40 AM
Subject: RE: KR> Spars
> Chris said;
>Tendi
---Original Message---
From: Chris Johnston
List-Post: krnet@list.krnet.org
Date: 01/14/06 06:49:55
To: KRnet
Subject: Re: KR> Spars
Cultural difference, actually mean 2-3 millimetres, like the girls in
California saying we will pick you up out the front of your hotel at 7 and
go to the &qu
With the glues that we have today, like T-88, is scarfing really necessary?
Would not just gluing on a cross member do just as well? I know that the
woodworking purists will scoff at this, but T-88 won't come apart. If you
were concerned about the contact area, you could put in a little wider cross
e tank were made of aluminium
plate instead of sheet metal, I would think there would be far less chance
of leakage, but anyway, its all horses for courses.
- Original Message -
From: "Steve Bray"
To:
Sent: Saturday, January 14, 2006 1:26 PM
Subject: RE: KR> Spars/apolog
>. I, personally, do not think that scarfing is any fun and find it
>most difficult to get a straight line.
>Daniel R. Heath
+++
With the right setup, scarfing the sheer web ply can be one of the
easiest parts of building a spar. I used a sandi
At 07:23 AM 1/14/2006, you wrote:
>With the glues that we have today, like T-88, is scarfing really necessary?
>Would not just gluing on a cross member do just as well? I know that the
>woodworking purists will scoff at this, but T-88 won't come apart. If you
>were concerned about the contact area,
Sallie Flesner"
To: "KRnet"
Sent: Saturday, January 14, 2006 8:45 AM
Subject: RE: KR> Spars
>
>>. I, personally, do not think that scarfing is any fun and find it
>>most difficult to get a straight line.
>>Daniel R. Heath
> ++
--Scarfing is not a big problem and only takes a mater of minutes to
accomplish. I have built my entire airframe scarfing the ply by hand. I did
not use the disc on a drill method in the assembly manual. I used 1 x 2 pine
cut about 18" long and using spray mount adhesive I affixed 80 then 100
Hi Ron, Yes, The extra material is needed to provide enough material around
the attachment bolts at the upper and lower spar caps. I am using the taller
airfoil and I also have the TET gear leg brackets that are taller to match the
spar height. Even though the TET brackets are taller and the
>>I seen somewhere here where the attatch points of the Deihl landing gear
>>brakets to spar had extra material in them for the new thicker wing???
>>Have looked but cant find.Is this necesary or not???<<
The drawing you are talking about is at
http://www.krnet.org/as504x/as5046inst.html ,
Forwarding this from Bill Clapp:
A few weeks ago I left a message - looking for stock KR2 spars (centers would
be nice too) and somebody in Jaxsonville FL had a set. Can you contact me at
229-834-8996 if you have a set available for sale or as a gift. I am trying
to get a set for Bob Lester
Pour : "KRnet"
cc :(ccc : Serge VIDAL/DNSA/SAGEM)
Objet : KR> spars needed for Bob Lester's airplane!
Forwarding this from Bill Clapp:
A few weeks ago I left a message - looking for stock KR2 spars (centers
would be nice too) and somebody in Jaxsonvi
Did they ever say what caused the engine to run ruff??
Eric Pitts
Terre Haute Indiana
KR2S
Kraut
Engineering Alternatives, Inc.
www.engalt.com
-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Mark Langford
Sent: Wednesday, May 25, 2005 8:46 AM
To: KRnet
Subject: KR> spars needed for Bob Lester's airplane!
Importance: High
Forward
I'm up to the wing stage and have fitted the outer spars, The main spar feels
solid as a rock as one would expect.
But the aft spar feels kinda flimsy to me !! The main spar has no movement at
all but when I flex the rear spar at the tip it seems to flex quite a bit and
doesn't feel at all like
Gav wrote:
> It seems to me that the rear spar will mainly take the fore to aft loads
encountered from wing drag.
You are correct. The rear spar is mainly there to keep the wing from
folding backwards"to take the moment", and was not designed or expected
to do a lot of the lifting, so it can
- Re: KR> Spars
> Gav wrote:
>
> > It seems to me that the rear spar will mainly take the fore to aft loads
> encountered from wing drag.
>
Rear spar breakage in a KR is not something to lose
> any sleep over...
Thanks Mark I feel a whole lot better now.
Gav
Bill Clapp told me a story of a gentleman whom flew to a gathering in his KR
and after landing was shocked when another person asked if he commonly flew
without wing attachment bolts in his rear spar. Have a good holiday
Steven Phillabaum
Auburn, Alabama
What's the common thinking about making the main spar one piece? I don't mean
a solid spar, just constructing the built-up spar 17' long(KR-1) insead of
doing it in three pieces. I'd like to do this for some peace of mind (I don't
completely trust the WAFs, and no amount of reasoning will conv
them. To the
best of my knowledge there is no history of faillure in this area, at least
none has ever been reported.
Bob Stone, Harker Heights, Tx
rston...@hot.rr.com
---Original Message---
From: KRnet
List-Post: krnet@list.krnet.org
Date: 12/01/04 18:03:10
To: KRnet
Subject: KR
e.
"Michael Moore is a living example to NEVER trust ANYONE who's bigger around
than they are tall!"
---Original Message---
From: John Lindner
List-Post: krnet@list.krnet.org
Date: 12/01/04 17:01:59
To: KRnet
Subject: KR> spars
What's the common thinking about maki
What's the common thinking about making the main spar one piece?
+++
I share your discomfort here John, plus a few others. I accept that the
KR spar is stronger than a brick outhouse and there have been no
reported failures etc. etc. It still worries me.
As ever, I express my
Netters
Search the archives and I am sure you will find a comment from one of the more
learned builders cautioning against randomly adding your own "reinforcements"
to assemblies with out first testing the results. The WAFS have never failed
when properly built, and I fly behind them and trust t
Every few years, we go through a long thread of discussion about spar
re-design. In this recent set, the one thing that is apparent is that the
people talking about making major changes in the spar do not have any
training in structural design. This is not an area where you design by
eye-ball
n still be inspected.
Gene Leone, Worland, Wyoming
"Michael Moore is a living example to NEVER trust ANYONE who's bigger around
than they are tall!"
---Original Message---
From: Colin & Bev Rainey
List-Post: krnet@list.krnet.org
Date: 12/02/04 02:11:15
To: KRnet
It is not so much the strength of the WAF's that concerns me, it is
drilling all those holes in the spar (cap). Even the landing gear
mounts require holes drilled in the upper and lower spar cap ...
my intention is to add a wider pillar between the caps where the
undercarriage mounts, add a 2
To: "KRnet"
Sent: Saturday, December 04, 2004 3:46 PM
Subject: RE: KR> spars
> It is not so much the strength of the WAF's that concerns me, it is
> drilling all those holes in the spar (cap). Even the landing gear
> mounts require holes drilled in the upper and lower
>What's the common thinking about making the main spar one piece?
>
>??
Putting all comments aside re: WAFs, the main problem as I see it is the
problem of space.
1, Enough room to build and store the spars.
2, Once the spars are fitted to the boat, turing the boat over and just
working aro
minor repair.
Bob Morrissey
cam...@earthlink.net
- Original Message -
From: "Glynnis Young"
To: "KRnet"
Sent: Friday, December 03, 2004 11:46 PM
Subject: RE: KR> spars
> It is not so much the strength of the WAF's that concerns me, it is
> drillin
Just cleaning up the outer forward spars now and getting ready to put the
plywood on the second face. I used up the roll of film today and will get
it developed and put some pictures on the web site tomorrow if I get a
chance. Will have four spars down tomorrow and two more to go.
Brian Kraut
En
I still have a set of forward outboard spars for sale. The wood work is
excellent. Shear webs are birch plywood. The material to build these is
about $200.00. Now that I have finished a set I can also say that buying
these will save about 20 hours of labor and a good five or six eight hour
sess
I laminated my forward center spar caps today. They are currently clamped
and drying on a plastic tarp laid out on my living room carpet because it is
91 degrees in Florida today. My wife wasn't too happy about that one when
she got home. I can't wait to see her reaction when I start sanding in
This wAS SHOWN ON MY PLANS, Virg
On Mon, 29 Sep 2003 16:31:45 +1000 Gavin Donohoe
writes:
> Is it really that important which way the grain in the spars run ??
> Do the grain lines run vertical or horizontal when looking from the
> end if the spar material.
>
> Gav
>
>
> ---
> Outgo
@list.krnet.org
Date: Monday, September 29, 2003 7:42:56 PM
To: kr...@mylist.net
Subject: Re: KR>Spars
This wAS SHOWN ON MY PLANS, Virg
On Mon, 29 Sep 2003 16:31:45 +1000 Gavin Donohoe
writes:
> Is it really that important which way the grain in the spars run ??
> Do the grain
> Date: Monday, September 29, 2003 7:42:56 PM
> To: kr...@mylist.net
> Subject: Re: KR>Spars
>
> This wAS SHOWN ON MY PLANS, Virg
>
> On Mon, 29 Sep 2003 16:31:45 +1000 Gavin Donohoe
> writes:
> > Is it really that important which way the grain
At 08:48 PM 9/29/2003 -0400, you wrote:
> If I remember right it was vertical . That is the direction of
>stress, Virg
The spar grain runs horizontal; the plywood caps run vertical, according to
the manual - and good building practices (strength).
Larry Severson
Fountain Valley, CA 927
Larry Severson wrote:
> The spar grain runs horizontal; the plywood caps run vertical, according
to
> the manual - and good building practices (strength).
Man that is some really bad news. When Wicks sent me my spar cap material,
it was only an inch thick, in two pieces that were to be laminated
Oh, now this is a real bummer. I did a few minutes of searching through the
archives and turned up this post from Don Reid, who says it doesn't matter
how the grain is oriented in the main spar caps!
Don Reid is the resident expert on all things structural on this list. He's
not only a mechanica
- Original Message -
From: "Mark Langford"
>
> H. Maybe that was a perfectly good KR after all...
>
> Mark, the future RV Aviator
This could be bad...it is not even April !!!
Mark Jones (N886MJ)
Wales, WI USA
E-mail me at flyk...@wi.rr.com
Visit my KR-2S CorvAIRCRAFT web site a
does flat grained lumber.
Gene Lukan
elu...@telusplanet.net
- Original Message -
From: "Gavin Donohoe"
To: "KR builders and pilots"
Sent: Monday, September 29, 2003 12:31 AM
Subject: KR>Spars
> Is it really that important which way the grain in the spars run
Page 19 of the January 1990 KR2 manual shows the build up of the spars. I
believe that what I said led to some confusion. What I called spar caps, it
calls spar web (plywood). The long piece of spruce sawed and placed on the
top and bottom of the spar, with spacers between them are called the sp
http://home.hiwaay.net/~langford/burned_it.jpg
Mark Langford, Huntsville, AL
N56ML "at" hiwaay.net
see KR2S project at http://home.hiwaay.net/~langford
---
From: KR builders and pilots
List-Post: krnet@list.krnet.org
Date: Monday, September 29, 2003 11:41:09 PM
To: KR builders and pilots
Subject: Re: KR>Spars
http://home.hiwaay.net/~langford/burned_it.jpg
Mark Langford, Huntsville, AL
N56ML "at" hiwaay.net
see KR2S project at http://ho
I've been building boats, cabinets,houses for 50 some yrs; be glad to pick up
that kr-2-s-special before the fire. Will fly without one doubt about spar
grain direction. Driveway fires are not code in n. Alabama.
Langford
Sent: Monday, September 29, 2003 10:06 PM
To: KR builders and pilots
Subject:Re: KR>Spars
Larry Severson wrote:
> The spar grain runs horizontal; the plywood caps run vertical, according
to
> the manual - and good building practices (strength).
Man that is some r
:Re: KR>Spars
Burned What? And, What does that have to do with Spars?
N64KR
Daniel R. Heath - Columbia, SC
da...@kr-builder.org
See you in Mt. Vernon - 2004 - KR Gathering
See our KR at http://KR-Builder.org - Click on the pic
See our EAA Chapter 242 at http://EAA242.
Mark,
gosh, That's sad but in the true tradition of Lemmings let the burning
begin.
my next post will be with smoke signals from the driveway.
Joe Horton
On Mon, 29 Sep 2003 22:40:55 -0500 "Mark Langford"
writes:
> http://home.hiwaay.net/~langford/burned_it.jpg
>
> Mark Langford, Huntsvil
003 9:41 PM
To: KR builders and pilots
Subject: Re: KR>Spars
http://home.hiwaay.net/~langford/burned_it.jpg
Mark Langford, Huntsville, AL
N56ML "at" hiwaay.net
see KR2S project at http://home.hiwaay.net/~langford
___
see KRnet li
Gavin,
I basically built my center wing stub with the dihedral starting at the
center line inside the fuselage. Both for front and rear spars. Did
this by calculating correct dihedral to get to wing tips, assuming the
outer wings would just be an extension of the dihedral. Construction of
cente
Gavin wrote:
> Is it stronger to laminate the spar centre
> sections from maybe 1" planks and bend them on the bench before the
> glue is set ??Maybe 1" is too thick to laminate maybe I need thinner
> pieces but more of them?? Can someone with experience help to answer
> some of these questions??
Gavin wrote:
> Is it stronger to laminate the spar center
> sections from maybe 1" planks and bend them on the bench before the
> glue is set ??Maybe 1" is too thick to laminate maybe I need thinner
> pieces but more of them?? Can someone with experience help to answer
> some of these questions??
Is it really that important which way the grain in the spars run ?? Do the
grain lines run vertical or horizontal when looking from the end if the spar
material.
Gav
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
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> Is it really that important which way the grain in the spars run ?? Do the
grain lines run vertical or horizontal when looking from the end if the spar
material. <
Last time we debated this issue, we decided it didn't matter.
Mark Langford, Huntsville, AL
N56ML at hiwaay.net
see KR2S project N5
I've been reading on Marks site about the new airfoils and have decided to go
with the 5048/6 option !! I also like the idea of starting the wing dihedral
inboard of the first rib. Has anybody done this yet and how was it done ?? I
have lots of timber but not the right thickness, Is it stronger
Looking at something that someone wrote about another airplanes spars was about
the grain of the wood not being correct for a spar. On the edge of the spar
material the grain is at a 45degree angle which is incorrect due to the load
direction will crack against the grain in a 45 degree manner.
Justin wrote (and this may have already been addressed but here goes
anyway)-
>Looking at something that someone wrote about another airplanes spars was
>about
>the grain of the wood not being correct for a spar. On the edge of the spar
>material the grain is at a 45degree angle which is incorre
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