On 10/10/2019 11:38 AM, Mark Langford via KRnet wrote:
Templates for the new horizontal and vertical stabilizers are located at
http://www.krnet.org/as504x/ . See the link near the bottom, named
"Free KR2S Airfoil Template Downlaod". Any of the three choices
includes tail templates. Incidence
Les Palmer cut me an aluminum gear which copied Dan’s design. We made the gear
an extra 2 inches longer. I wish I had done it from the very beginning.
Sent from my iPhone
> On Jan 22, 2019, at 10:17 PM, Kayak via KRnet wrote:
>
> I think the original retracts had a coolness factor. and no othe
I think the original retracts had a coolness factor. and no other
advantages plus all the disadvantages you mentioned. I do recall from
reading newsletters 30 years ago that the unlocking and broken bolts issues
are fixable, but you still have less ground clearance and more drag not to
mention for
Hello Randall, I'm going to convert to fixed landing gear & your
performance figures look really good, what brand of kit did you use was
it the Diehl landing gear ?.
On 2019-01-22 05:26, Randall Smith via KRnet wrote:
> I know when I started flying my KR it had retractable gear after the third
Sounds like Richard and I are on the same page. My 81 JM is also an
original retractable light KR II. My instructions when I bought her 30
years ago was to fly the pattern at 80, over the fence at 60, touching down
something below that. Works for me. Although I've tried three point
landings, they d
Hi Mark.
I have no first hand knowledge of a higher higher stall speed with the
newer airfoils and just repeted what was stated in one of the recent posts
on that subject.
I also just checked the info on my KR-2 plans which calls the stall at 42
mph, and 52 mph for the KR-2S. I was never able to c
There are several good reasons for selecting fixed gear, but less drag is
the one most difficult to prove because it requires that a well faired in
retract be replaced with a well faired in fixed gear, and no other changes
be made while the aircraft is down for the mod.
There are quite a few KR peo
Make that "mistook the MIXTURE knob for the THROTTLE knob". I did
proofread it the first time, but apparently not thoroughly enough!
And shortly afterwards, I installed a completely different shaped and
sized knob for the throttlenot just a different color!
Mark Langford
m...@n56ml.com
htt
Rich wrote:
> The increased aircraft weight and the increased stall
> speed / landing speed of the newer airfoils quickly overwhelms the KR
> mechanical brakes leading to longer runway requirements.
I'm not sure where you got the impression that the newer airfoils
increase stall speed and landi
I know when I started flying my KR it had retractable gear after the third time
the gear unlock while I’m landing I decided to go with a fixed gear. I actually
picked up 5 to 7 kn with a fixed gear and wheels all fared in. Plus I picked up
ground clearance on my prop.
Sent from my iPhone
> On
I've been following the airfoil thread and would like to add one thing.
Almost every modification you make to the original design will have an
up-stream or down-stream effect. Decisions on which airfoil you plan to use
will likely effect the type landing gear you will be happy with.
I chose the ret
On 11/27/2017 10:19 AM, Samuel Ajayi via KRnet wrote:
You may ask, why go through all this; speed! With an O-200 in front, the KR
should be able to produce better speed numbers(210-230mph) and not sacrifice
much more in approach and stall speeds.
++
IIRC, Roy Marsh's plane, the 'poster child' for the original KR-2S promo
literature, used the 23012 airfoil, which some of the Beech and Taylorcraft
aircraft have used. Per NACA airfoil nomenclature, that makes it an unreflexed
12% thickness airfoil.
I have no information on how Roy's plane p
KR100, from krnet:
http://www.krnet.org/krs/kr100/
On 11/27/2017 9:19 AM, Samuel Ajayi via KRnet wrote:
Thanks Oscar and Mark for inputs. A spar modification or outright replacement
with carbon fiber may be in order. I will be using a +/-7 G loading as build
criteria should I decide to build
Thanks Oscar and Mark for inputs. A spar modification or outright replacement
with carbon fiber may be in order. I will be using a +/-7 G loading as build
criteria should I decide to build one. An airfoil replacement may be the
simplest solution. You may ask, why go through all this; speed! With
Samuel wrote-
>has anyone used thinner than 15%. Would thinner mean more speed?
I don't know about the speed, but I can tell you that there was a considerable
amount of credible and documented (and flight-proven) study and research done
to arrive at the AS50xx-series of airfoils that are spec
Hi all, is there any noticeable speed difference between having AS5048 and
AS5046 at the root. Also, how do the stall speeds compare? I know it is
something quite difficult to quantify because no 2 aircrafts are the same.
Lastly, has anyone used thinner than 15%. Would thinner mean more speed?
One is for if you have existing (RAF48) spars and the other is the 'pure'
form of the new airfoil, but I can't remember which is which. The new
airfoil pages on Mark Langford's site will tell you.
TK
On 4 September 2014 11:52, Paul-Visk via KRnet wrote:
> When would you use the AS5046 airfoil
Can I assume that the AS5048 has more drag but then more lift?
Paul Visk
Belleville Il
618 406 4705
Sent on the new Sprint Network from my Samsung Galaxy S?4.
Original message From: Mark Langford via KRnet
Date:09/04/2014 4:28 AM (GMT-06:00)
To: KRnet Subject: Re: KR
Paul Visk wrote:
> When would you use the AS5046 airfoil and not the AS5048? I made my rib
> templates with the AS5048 and needed some more templates and printed by
> mistake the AS5046. I noticed the height of the main spar is thicker.
See http://www.krnet.org/as504x/as5046inst.html for the
When would you use the AS5046 airfoil and not the AS5048? I made my rib
templates with the AS5048 and needed some more templates and printed by
mistake the AS5046. I noticed the height of the main spar is thicker.
Paul Visk
Belleville Il.
618-406-4705
I just purchased a KR2 project from a friend in hopes of using parts on my
KR2s that I have been working on for a while. He has narrowed the fuselage
a little for a single seat version. I have a question. He has a lot done on
the wings. Both outer wings have the top foam in place and sanded to
cont
You can't be that precise with paper templates anyway. I noticed that my
rib template was short by 1/8 inch. I thought that kinko's printer scaled
it...went through a bunch of file manipulation to make a dxf file and
such...then thought i would check one that was already glued to a
rib...nuts on.
Phil Hill wrote:
>...when faced with cutting out an
> airfoil profile, like the ones in our KR plans, do you cut outside the
> line, inside the line or right down the middle? The line is so thick,
> where you cut it, makes a difference.
It won't matter if the size is a little large or small, or
If you go here http://www.krnet.org/as504x/ and download the PDF and print
it up full size BAM you have your template.
Todd
Chandler, AZ
On Sat, Mar 13, 2010 at 9:36 AM, wrote:
> Net heads,
> There has been a lot of reference to pilots becoming ham radio operators.
> There are a lot of reasona
Net heads,
There has been a lot of reference to pilots becoming ham radio operators. There
are a lot of reasonably priced hand held 2 meter rigs with key pads that can
access repeaters with telephone autopatch, that can be carried along on your
plane incase of an emergency. Just like using a cel
Don: are you the author of AeroFoil, the airfoil analysis program, or are
there other Don Reids in the world?
KR content: Don is one of the resident (and credentialed) aero engineers on
the KRNet. He doesn't toss out many posts, but when he does- it's worth
reading what he has to say. Buildin
At 09:51 PM 2/15/2007, you wrote:
>Don: are you the author of AeroFoil, the airfoil analysis program, or are
>there other Don Reids in the world?
>
>KR content: Don is one of the resident (and credentialed) aero engineers on
>the KRNet. He doesn't toss out many posts, but when he does- it's worth
Personal Olá, I am writing of Brazil. Would like to know which the profile of
the airfoil one that he is more used in kr-2s? Raf-48? AS5046? In case that it
modifies airfoil the necessary one to modify the empennage? Somebody already
placed Droop in the wings of kr-2s? I intend to gain more stab
Personally, I would do it in CAD...
If you don't have that ability, the easiest hands on way I can think of
is to take your 15% and lay it on top of your 18" with the leading edge
for the 15% offset from the leading edge of the 18% the distance that it's
supposed to be (as measured in the plan
Subject: KR> Airfoil interpolation was 18% something or other
Personally, I would do it in CAD...
If you don't have that ability, the easiest hands on way I can think of is
to take your 15% and lay it on top of your 18" with the leading edge for the
15% offset from the leading edge o
: KRnet
Subject: KR> Airfoil interpolation was 18% something or other
Personally, I would do it in CAD...
If you don't have that ability, the easiest hands on way I can think of is
to take your 15% and lay it on top of your 18" with the leading edge for the
15% offset from the leadin
elder
My Airplane Project:
http://www.infinigral.com/melder/flying/KR1/
- Original Message
From: Bill Johnson
To: Matthew Elder ; KRnet
Sent: Tuesday, May 9, 2006 12:50:30 PM
Subject: RE: KR> Airfoil interpolation was 18% something or other
You would probably want to align
Netters;
When hot-wiring, don't lose sight of the fact that if you are using
urethane foam that the process produces CYANIDE GAS which can be
injurious to your health!
Just in case you missed that info in past posts to the KRnet, or didn't
check the archives.
Paul
KR2s
Erie, PA
At 07:28 AM 5/9/2006, you wrote:
>Personal Olá, I am writing of Brazil. Would like
>to know which the profile of the airfoil one
>that he is more used in kr-2s? Raf-48? AS5046?
>In case that it modifies airfoil the necessary
>one to modify the empennage? Somebody already
>placed Droop in the w
At 08:36 AM 5/10/2006, you wrote:
>Go to http://www.N56ML.com for the complete story of the new wing.
+++
Try http://home.hiwaay.net/~langford/kopinion.html#airfoil for a
direct link.
Larry Flesner
Has any one here made a mold of the new airfoil to pull wing skins from?
thanks
jerry
kr1 not started, still planning, fiberglass & foam ordered.
Hey there KRnetters
I have uploaded to my FTP a pair of .ARC files for use with DesignFOIL or
other similar program.
I made them from the co-ordinates posted on the new airfoils link so I could
easily plot the new airfoils into Rhino3D for use with my design ideas.
I am drawing the plane out in CAD
There have been several references to what occurs when modifying airfoils. To
those who are serious about this
subject. There is a proactive calculator available at
http://adg.stanford.edu/aa241/airfoils/panda.html
read the top and bottom of the page to llearn how to utilize
this tool. Don't forg
>From: lloyd schultz
>Your main complaint against 23012 seems to be handling, or specifically,
>its
>abrupt stall behavior. But what could be more docile than a Bonanza, All
>use 23Queen 012.
>
>
Lloyd, while I will admit the Bonanza wing is a very smooth platform when
kept within it's envelop
Hello All,
Sorry for off topic, just one question, may be some one will help me.
How could I find the info about GA 30U airfoil series? Particularly
Interested in GA 30U 414 foil.
BR,
Alex Birca,
Moldova
Netters;
The stall characteristics of the new AS50xx-series airfoils were documented
in the development of the airfoil, based on the airfoil analysis and the
wind tunnel testing. In addition to the technical development work, an
article was prepared and published in Contact! magazine about the
Greetings Alex:
That airfoil was designed by Harry Riblett
You can contact him at:
Harry Riblett
416 Riblett Lane
Wilmington, Delaware 19808
He has also published a great book of airfoils for General
Aviation
Richard Selix
San Diego, California
Alexander Birca (MD/RMD) wrote:
> Hello All,
> S
Please bear with me as this is a new computer and I'm having a little trouble
getting used to it. The question I have for anyone who would care te express
an opinion concerns the airfoil for a KR2S. The design I would like to use is
the one Roy Marsh developed for the KR2S prototype. It is a
Bob Tallini wrote:
>>The design I would like to use is the one Roy Marsh developed for the KR2S
prototype. It is a modified NACA 230012. <<
Bob, I just plain wouldn't use a 23012, no matter how modified it was.
Although it was used on everything from Cherokees to Bonanzas, the stall
character
Mark-
Which Cherokee used the 23012?
I've flown several airplanes that use 23012, none of which were threatening.
Aren't the flight characteristics of a wing nearly as dependent on aspect ratio,
geometric twist, wing loading, high-lift devices, stall strips and planform...to
name a few...as the s
Lloyd Schultz wrote:
> of the most docile airplanes out there. I can't help thinking that making
a
> "sweet"-flying wing is like baking a really good pastry...it's as much a
result
> of the chef's ability as the vitals used. No?
I knew somebody would make this point. The aircraft factories that
Mark-
After thinking about your post, I'm compelled to comment further. Understand
going in that I'm as amateur as one can be, so I don't know what I'm talking
about:
It was mentioned that Roy Marsh's son is an aero engineer and chose 23012 for
Roy's PURPOSE-BUILT KR2S speedster. The magazine art
I think you just finished saying the same thing I did. It's probably not
going to have a pleasant stall characteristic, and if you tune that out
through other geometry changes, you'll be throwing away the speed.
He's free to build it as he sees fit, but I hope it sees more time in the
air than Ro
If I am not mistaken, this is the same or nearly the same airfoil on my
Bonanza. While it is a great speed wingtrust me..when it
stalls, IT STALLS. If both wings are not absolutely identical you will see
one wing drop dramatically sooner than the other.
Great for a roller coas
cteristics of the stock RAF48. Just my opinion though...
My reply is: "My thoughts exactly"
Richard Alps, from the Denver area
- Original Message -
From: Mark Langford
To: KRnet
Sent: Saturday, December 20, 2003 9:54 AM
Subject: Re: KR>airfoil design
Lloy
Another case in point about this airfoil. It may or may not apply to the KR
but take it as just more information.
When we first bought the Bonanza, of course we wanted to explore it's flight
envelope. So, up we went one day and decided to try some stalls. Power
came in, nose went up...up...u
Gentelmen,
I think that old saying is applicable here, "If it aint broke, don't
fix it"
Bob Stone, Harker Heights, Tx
rsto...@hot.rr.com
- Original Message -
From: "RICHARD G ALPS"
To: "KRnet"
Sent: Sunday, December 21, 2003 12:27 AM
Subject:
Just your biased opinion. Everyone has one. You are to owed by engineers
with aero degrees.
We just do the best we can and with the elements we have to work with.
Ron
- Original Message -
From: "Mark Langford"
To: "KRnet"
Sent: Saturday, December 20, 2003 10:5
ACA 23015 NACA 23012
Western PGK-1 Hirondelle NACA 23012 NACA 23012
Wideroe C.5 Polar NACA 23012 NACA 23012
> - Original Message -
> From: "Mark Langford"
> To: "KRnet"
> Sent: Saturday, December 20, 2003 10:54 AM
> Subject: Re: KR>airfoil de
>From: "Ron Eason" >Just your biased opinion. Everyone has one. You are to
>owed by engineers
>with aero degrees.
>We just do the best we can and with the elements we have to work with.
>
>Ron
Hum, I'm still trying to figure out the worthwhileness (what a word) of this
gem.
Dana Overall
1999
Was wondering if anyone knew why we gave up 3" in length (surface area also) on
the new airfoils at the out board ends. I am referring to the 33" to the stock
36" length. Stock vrs. AS5046 - 33"
Safe Flying to ya!
Steve McGee
Endeavor Wi.
Building a KR2S widened.
lmc...@maqs.net
Wings built with a greater aspect ratio tend to create less drag than a
wing built with a lesser aspect ratio, even when their area remains the
same.
Aspect ratio is a comparison between the length and width of a wing.
Length of Wing Span
-- = -
Wings built with a greater aspect ratio tend to create less drag, than a
wing built with a lesser aspect ratio, even when their area remains the
same.
Aspect ratio is a comparison between the length and width of a wing.
Length of Wing Span
-- =
At 12:10 PM 11/28/2003 -0600, you wrote:
>Was wondering if anyone knew why we gave up 3" in length (surface area
>also) on the new airfoils at the out board ends. I am referring to the
>33" to the stock 36" length. Stock vrs. AS5046 - 33"
The whole wing, outboard of the stubs is tapered. Not m
Wings built with a greater aspect ratio tend to create less drag, than a
wing built with a lesser aspect ratio, even when their area remains the
same.
Aspect ratio is a comparison between the length and width of a wing.
Length of Wing Span
-- =
Steve McGee wrote:
>> Was wondering if anyone knew why we gave up 3" in length (surface area
also) on the new airfoils at the out board ends. I am referring to the 33"
to the stock 36" length. Stock vrs. AS5046 - 33"<<
I guess you'll have to explain your problem in greater detail, because I
don
.
Mark Jones answered another DUH question for me the other day. So I will
look closer now and ask the DUH questions only after I have gone over all
the prints.
No pride here.
- Original Message -
From: "Mark Langford"
To: "KRnet"
Sent: Friday, November 28, 2003 6:5
Mark Langford,
I had not looked at the sheet with the horizontal stab. templet
in a long time. When I looked at it last night I saw there was another
rib that appears to be at the tip that the horner tip could be shaped
from . Is this correct? If it is that is what I'm going to make( and be
Joe Horton wrote:
> I had not looked at the sheet with the horizontal stab. templet
> in a long time. When I looked at it last night I saw there was another
> rib that appears to be at the tip that the horner tip could be shaped
> from . Is this correct?
Yep, it's there to help form the t
Dan,
You are so right and I misspoke myself, mainly referring to the lack of test
data on the RAF 48 when it was decided to be used, vs. the new wing actually
being developed for the KR2 specifically. I am sure that between the KR2s and
the Taylor monoplanes that have been built there are many
Just what you've been looking for... information on airfoils here:
http://www.engr.utk.edu/~rbond/airfoil.html
And to answer the question that always seems to come up ("Which airfoil does
the Fireball 4000 use?") try this huge list:
http://www.aae.uiuc.edu/m-selig/ads/aircraft.html and check ou
://KR-Builder.org - Click on the pic
See our EAA Chapter 242 at http://EAA242.org
---Original Message---
From: KR builders and pilots
List-Post: krnet@list.krnet.org
Date: Tuesday, July 08, 2003 8:52:27 AM
To: kr...@mylist.net
Subject: KR>airfoil selection
Just what you've been loo
Dan Heath wrote:
> Thanks for the Info. I did some more searching to see if I could find the
> numbers for the RAF48, but could not.
> Does anyone have the numbers, or know how to search for them?
I'm not sure what numbers you're talking about, but everything I have on the
RAF 48 is located at h
and here's something else, at http://kr.abshier.org/newsletters/nl4.html ...
Mark Langford, Huntsville, AL
N56ML "at" hiwaay.net
see KR2S project at http://home.hiwaay.net/~langford
http://home.hiwaay.net/~langford/kraf48.html
- Original Message -
From: "Dan Heath"
To:
Sent: Tuesday, July 08, 2003 7:36 PM
Subject: Re: KR>airfoil selection
Oscar,
Thanks for the Info. I did some more searching to see if I could find the
numbers for the RAF48, but cou
my web page to show the work.
KRRon
- Original Message -
From: "Mark Langford"
To: "KR builders and pilots"
Sent: Tuesday, July 08, 2003 6:58 PM
Subject: Re: KR>airfoil selection
> Dan Heath wrote:
>
> > Thanks for the Info. I did some more s
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