KR> Tail wheel/rudder interconnection

2009-12-22 Thread John Martindale
It is also very difficult to measure because it varies with weight and tail
attitude. Rolling the wheels along forwards on concrete with toe in leads to
the legs being pulled in which also alters it. It really needs to be done
consistently on a flat plate on ball bearings to remove all friction between
tyre and concrete.


John Martindale
29 Jane Circuit
Toormina NSW 2452
AUSTRALIA

ph: 61 2 6658 4767 (H)
mob: 0403 432179
email: john_martind...@bigpond.com

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Barry Kruyssen
Sent: Wednesday, 23 December 2009 2:13 PM
To: 'KRnet'
Subject: RE: KR> Tail wheel/rudder interconnection

Zero toe in and zero camber are the what we are aiming for.

But our toe in changes with the forward movement because of our suspension
design. 

snip



KR> Tail wheel/rudder interconnection

2009-12-22 Thread Larry Knox
I think they only have a Ph/Fax number 805-646-6042 la...@lebanair.com 

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of 
Myron (Dan) Freeman
Sent: Tuesday, December 22, 2009 2:36 PM
To: KRnet
Subject: KR> Tail wheel/rudder interconnection

[quote] Of course, I like the breakaway that I have now, from Aviation
Products, much better than any other that I have ever had. Dan Heath



Hi Dan;



Do you have any pictures on your web site or a link to the Aviation Products
web site? I did a search but didn't find it.



Regards, 

Myron (Dan) Freeman 

Indpls, Ind. 46203-3570 

Home of the Indy 500, 

the World's most famous 

auto race. 

mfreem...@indy.rr.com 

? 

___
Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
please see other KRnet info at http://www.krnet.org/info.html



KR> Tail wheel/rudder interconnection

2009-12-22 Thread Larry Knox
Maybe not an expert but expert info. 1/4 in per wheel is probably minimum
depending on the length and spring of you gear. Works for us on the hornet,
longer gear we use a little more, I'm sure you will get the real low down
from a real professional shortly it seems this net has a very valuable asset
in it field of professionals. la...@lebanair.com 

-Original Message-
From: krnet-bounces+larry=lebanair@mylist.net
[mailto:krnet-bounces+larry=lebanair@mylist.net] On Behalf Of Barry
Kruyssen
Sent: Tuesday, December 22, 2009 2:14 PM
To: 'KRnet'
Subject: RE: KR> Tail wheel/rudder interconnection

Hi Dan

With regards to your wheel alignment.

Never, ever should you have toe out.  TOE OUT IS BAD.
Let me explain (from what I know), a small amount of toe in is required as
when the vehicle is moving forward, any movement (give, spring) in the
suspension (and steering on cars) will result in the wheels pivoting
backwards (every so slightly) and thus the wheels will end up parallel which
is where we want them. 

Now with toe out you will find that the vehicle will veer (dive) left or
right and when you correct it, it will over correct.  In cars (where I have
most of my limited experience in wheel aligning) toe out makes it hard to
drive a car straight on very smooth flat road, the car keeps wanting to
wander.

Having a toe in of zero will most likely result in toe out when the vehicle
is moving forwards.

Too much toe in will scrub the tyres causing unnecessary wear.

For more detail see may email in the archive
http://www.maddyhome.com/krsrch/index.jsp dated 13 Feb 2008 and from
k...@bigpond.com.

My one cents worth (down from 2 cents due to the recession).
As per normal, your results may differ and I'm no expert.

Regards

Barry Kruyssen
k...@bigpond.com 
http://athertonairport.com.au/kr2
RAA registered 19-3873
Australia


-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Myron (Dan) Freeman
Sent: Wednesday, 23 December 2009 7:17 AM
To: KRnet
Subject: KR> Tail wheel/rudder interconnection



I encountered problems during takeoff and landing with the plane wanting to
drift left even with no crosswind and after checking the wheel alignment I
discovered that the wheels were misaligned to the left by several inches
(measured at a 10 foot distance) and were toed-in, this I am told is not
good, if anything they should be toed-out slightly.

Anyway, after correcting the wheel alignment the plane taxied straight and
true but after several harrowing takeoffs and landings in mild crosswind
conditions I knew that something else was wrong with it.





___
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KR> Tail wheel/rudder interconnection

2009-12-22 Thread Larry Knox
Did I miss something. This seems like a lot of commotion about a tail wheel 
when Aviation Products Inc. 114 Bryant St. Ojai, CA 93023  Ph 805-646-6042 
makes a wonderful 4 or 6 in single or double fork full steerable, castering 
tail wheel assembly. They have medium hard solid rubber tires that sound and 
feel like a tube tire when taxiing or on the runway and have an amazing 
lifespan. They work better than any certified Mall tail wheel and as well as 
the Scott on my Stinson's and our Cessna's. You just can't go wrong.  $235 and 
$255 complete without the springs and chains. Works of the rudder horn and with 
the 6 in tire on N68KR she looks like a single arm Mall tail wheel with a bush 
wheel tire. la...@lebanair.com  Tell them we had you call. 

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of 
Myron (Dan) Freeman
Sent: Tuesday, December 22, 2009 1:17 PM
To: KRnet
Subject: KR> Tail wheel/rudder interconnection

Hi guys and girls;

Before the unfortunate accident with Ol' Blue I made the comment that every
time I thought that I had everything fixed I always seemed to find something
else to fix or change on the plane.

One of the things that I hadn't got around to was the tail wheel/rudder
interconnection. I knew It wasn't right but I wasn't sure how to fix it.

I did a search on the KR net and found 500 or more references to tail wheel,
most of which didn't concern my question but with so many, I could have
missed it.

Anyway, before I purchased Ol' Blue I did a walk around and discovered that
the rudder seemed to be disconnected from the tail wheel and the rudder
peddles as well. I also noticed that when sitting in the pilot seat and
working the rudder peddles that the rudder did not move but the tail wheel
did, which helped explain why the previous owner used the brakes to keep the
plane straight during takeoff and landing, something that my instructor told
me never to do, your instructor may differ. 

So I knew something was not right and that I would have to do something
about it after the purchase. 

Well it was a simple fix, the tail wheel springs were drawn too tight and
the rudder cables were limp so I added extensions and that took care of that
 The rudder and tail wheel worked together in unison.

I encountered problems during takeoff and landing with the plane wanting to
drift left even with no crosswind and after checking the wheel alignment I
discovered that the wheels were misaligned to the left by several inches
(measured at a 10 foot distance) and were toed-in, this I am told is not
good, if anything they should be toed-out slightly.

Anyway, after correcting the wheel alignment the plane taxied straight and
true but after several harrowing takeoffs and landings in mild crosswind
conditions I knew that something else was wrong with it.

I have had a lot of time to think through the problem since the accident and
I noted that I had the same problem with the real plane as I did with my
X-Plane model. The conclusion was that when taking off or landing, until the
tail wheel leaves the ground, it is steering the plane down the runway for
the most part and if you have a crosswind you need to use rudder to
counteract the crosswind, but when you do, the tail wheel also turns and
steers you sideways which can result in a dangerous condition. So what to do
about it?

X-Plane continues to evolve and new features are added all the time and
recently a fully controllable tail wheel has been added, that is you can set
it up to behave anyway you want it to from full castering to locked straight
for takeoff or anything in between. So I said let the experimenting begin
and see what works best especially in a crosswind. Using X-plane is much
safer and quicker than using a test plane like Ol' Blue.

Now I already know how a tail dragger reacts when the tail wheel and rudder
are linked together with no slack, I considered it dangerous in a crosswind
on pavement, grass is more forgiving.

I've tried a full castoring tail wheel in X-Plane and for me I thought it
was dangerous also.

A tail wheel that is fixed straight ahead is too hard to maneuver on
taxiways so that just leaves a castoring/lockable tail wheel or a
steerable/lockable tail wheel I believe, unless I've forgotten something.

So I decided to use X-Plane to see which method worked the best and safest.

With X-Plane I can set the tail wheel to lock straight ahead by pulling any
up elevator input during takeoff or landing. In the real plane you would
have to lock it manually with a pull cable. But having flown my KR-2 model
in X-plane for several hundred hours now, I find it much easier to land and
takeoff in crosswinds with a locked tail wheel when on pavement, grass as I
said is more forgiving even in X-Plane.

I don't know if there is anyone who is using a castering/locking tail wheel
on a KR but if there is I would like very much to hear their real world
input on this subject as well as 

KR> Tail wheel/rudder interconnection

2009-12-22 Thread Barry Kruyssen
Zero toe in and zero camber are the what we are aiming for.

But our toe in changes with the forward movement because of our suspension
design. Our legs are springs which stick out sidewards from and down and
therefore MUST flex in ALL directions, though for and aft should be very
minimal because of its shape. (Just apply your brakes and apply power and
see how much they flex, mine move back about 6mm).

The DC3 and B17 suspensions work directly for and aft and up and down,
therefore their toe in does not change with suspension movement.  Their
suspension is nothing like the average KR2 (apples and oranges :-). 

Again my one cents worth.

Merry Christmas All


Regards

Barry Kruyssen
k...@bigpond.com 
http://athertonairport.com.au/kr2 
RAA registered 19-3873
Australia




-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Larry Flesner
Sent: Wednesday, 23 December 2009 10:53 AM
To: KRnet
Subject: RE: KR> Tail wheel/rudder interconnection


>  TOE OUT IS BAD. Hi Barry; I come from an automotive background and 
> I felt the same way until I read an article that claimed that 
> toe-out was better, go figure, and now I cannot remember were I 
> read that but I'm still looking  mfreeman


++

Assuming no fore and aft flex in the gear, I want my wheels trying to 
roll in the same direction as the airplane is moving.  Anyone know 
what toe-in / toe-out the gear on a DC3 or B17 are set to.  I'm 
guessing it's zero toe-in / toe-out. :-)  How many years has the DC 3 
been flying, 70 years or so?

Larry Flesner




KR> MIlitary Video

2009-12-22 Thread Mark Jones
Would someone please send me the post from tonight on the vertical take off 
military video. Thanks


Mark Jones (N886MJ)
Stevens Point, WI
E-mail: flyk...@charter.net
Web: www.flykr2s.com


KR> Tail wheel/rudder interconnection

2009-12-22 Thread Mark Langford
The Aviation Products tailwheel is shown at 
http://home.hiwaay.net/~langford/misc/05120360m.jpg.  This is not really a 
proper installation because vertical axis of rotation is too far inclined. 
It should be more like 5-15 degrees, and what I have is about 30 degrees. 
These tailwheels come in about three different angles, so my advice would be 
to fit a tailwheel spring first, make careful meauresments, and order the 
one you need.  I've been reluctant to "fix" it because that would put the 
tailwheel down further, making my landing speed even higher due to the 
reduced angle before the tailwheel touches down.  The yellow tailspring is 
not the original, but one that Larry Flesner sent me that I believe he got 
from a junk yard.  It's spring steel, and I believe it's 5/16" thick, but it 
was still too springy with my rough tailwheel first landings that I do 
occasionally while trying to get the airplane into my short runway.  The 
1/8" thick 4130 spring on top is a sort of limiting stiffener which at least 
prevents the tailwheel from hitting the rudder, which is what it did before 
it was installed.  Also note that there's a quarter inch piece of rubber 
between the top spring and the tailwheel block, placed there to reduce noise 
transmission from the tailwheel while taxiing.

Sorry I didn't bother to clean this up before I took the photo, but was 
answering the same question for somebody a few months ago and snapped this 
to send to them.  This is what my tailwheel looks like after over 2000 hard 
landings.  One other thing to notice about this is the low angle between the 
rudder and tailwheel cables, as Larry was mentioning.  I have no springs, 
just a direct connection made inside the fuselage, with turnbuckles so that 
the tailwheel can be perfectly aligned with the rudder.  There is slight 
slack on the tailwheel, and the "spring" is a miniature bungee cord pulling 
the two opposite tailwheel cables together to keep them from rattling due to 
wind forces on the cables outside.

There's more on my main gear and alignment at 
http://home.hiwaay.net/~langford/kgear.html .  This gear setup has served me 
well, and like Larry, I can't imagine how it could handle any better.  Troy 
Petteway, who's flown a lot of KRs, declared mine to be the best ground 
handling KR he'd ever taxied.  He's also owned and flown a LOT of more 
traditional tailwheel planes, and says in general that the KR has better 
ground handling than anything out there.  If setup up properly, KR ground 
handling is nothing to fear.  I've never "flown" X-plane, but my guess would 
be it'd be a great place to pick up bad habits that have no relation to 
flying the real thing...

Mark Langford
N56ML "at" hiwaay.net
website at http://www.N56ML.com




KR> Tail wheel/rudder interconnection

2009-12-22 Thread Lee Van Dyke
I like this group and most of the posts on this site.

But lets call BULLSHIT BULLSHIT.

Dan did you get your tailwheel endorsement from your instructor?  From what 
I  have read on the net about your accident it had nothing to do with your 
tail wheel/ rudder control.  But a gust of wind.  If you think about it 
there were several hundred hours on that plane with no other issues.  It is 
sad that you choose to put your thoughts about the accident on this net.

IT PISSES ME OFF THAT YOU THINK THAT THERE WAS A PROBLEM WITH THE TAILWHEEL/ 
RUDDER WHEN YOU DID NOT HAVE MORE THAN 4 TAKE OFF AND LANDINGS IN THAT PLANE 
PRIOR TO GOING TO THE GATHING.  YOU NOW CHOOSE TO FREAK OUT ALL OTHER PILOTS 
ABOUT THE TAILWHEEL CONTROL, AND ACCORDING TO ALL THE REPORTS ABOUT THE 
ACCIDENT IT HAD NOTHING TO DO WITH THE ACCIDENT.   I RECALL AN E-MAIL ABOUT 
THE FIRST FLIGHT OR TWO THAT YOU HAD IN THAT PLANE, THAT ENDED UP IN A 
REPAIR.

I am not picking on Dan in this E-mail, but I was told that I needed to 
change my retracts when I purchased my plane.  I have landed on a GRASS 
strip, a GRAVEL strip and off taxied off the runway at OSHKOSH and didn't 
get stuck or have the gear colapse. If you want to fly a KR1 or a KR2 or a 
KR2S, build it, fly it and have fun.

I did get my tailwheel endorsement prior to getting in my plane.  I did not 
have any KR time prior to getting into my plane.  My first flight/landing 
ended up 180 degrees to take off and going under telephone/cable wires.  ( I 
can give the full story at the camp fire)  but the bottom line is that it 
was not meant for this web site.

With your post, your thoughts about your flight, all that will influence 
what others will think about the plans of the airplane.  There is nothing 
wrong with the KR or the plans.  I feel your comments are unwarranted on 
this site right now.  When you have more time in a KR and have an Educated 
opinion then you should share it, and post your proven changes to the KR 
plan as well.

Lee Van Dyke
flying 'Snakebite' over 300 hrs
N420LV











> Before the unfortunate accident with Ol' Blue I made the comment that 
> every
> time I thought that I had everything fixed I always seemed to find 
> something
> else to fix or change on the plane.
>
> One of the things that I hadn't got around to was the tail wheel/rudder
> interconnection. I knew It wasn't right but I wasn't sure how to fix it.



KR> Tail wheel/rudder interconnection

2009-12-22 Thread Larry Flesner

>  TOE OUT IS BAD. Hi Barry; I come from an automotive background and 
> I felt the same way until I read an article that claimed that 
> toe-out was better, go figure, and now I cannot remember were I 
> read that but I'm still looking  mfreeman

++

Assuming no fore and aft flex in the gear, I want my wheels trying to 
roll in the same direction as the airplane is moving.  Anyone know 
what toe-in / toe-out the gear on a DC3 or B17 are set to.  I'm 
guessing it's zero toe-in / toe-out. :-)  How many years has the DC 3 
been flying, 70 years or so?

Larry Flesner






KR> Tail wheel/rudder interconnection

2009-12-22 Thread Myron (Dan) Freeman
[quote] Never, ever should you have toe out.  TOE OUT IS BAD.



Hi Barry;



I come from an automotive background and I felt the same way until I read an
article that claimed that toe-out was better, go figure, and now I cannot
remember were I read that but I'm still looking. It claimed that it would
forestall a ground loop.

If I find it I'll post it here so you can see their reasoning.

Anyway I set Ol' Blue at a slight bit of toe-in because I didn't believe the
article. 



Regards, 

Myron (Dan) Freeman 

Indpls, Ind. 46203-3570 

Home of the Indy 500, 

the World's most famous 

auto race. 

mfreem...@indy.rr.com 

? 


KR> Tail wheel/rudder interconnection

2009-12-22 Thread Larry Flesner

>  I don't have any
>close up photos.  In the photo at
>http://mysite.verizon.net/flesner/lf103.jpg you can see it is a very
>standard installation.
>Larry Flesner
>+++


I forgot to mention the one thing I did differently then most 
builders do.  I attached the tail wheel cable to the rudder cable 
inside the fuselage and they exit the fuselage through different fair 
leads.  I did this so the "pull angle" of the tail wheel cable is in 
line with the rudder cable and does not pull the rudder cable at an 
angle when rudder pressure is applied.  Most set ups have the cables 
connected outside the fuselage and, with the tail wheel on the ground 
and full rudder peddle deflection, you could be stressing your rudder 
stop if it is located at the rudder and not on the peddles 
themselves.  Any side loads on my tail wheel, when not running in 
line with the aircraft, are transferred in a straight line to my 
peddles and not pulling the rudder cable at an angle causing 
additional rudder deflection.  Clear as mud, right??

Larry Flesner





KR> Tail wheel/rudder interconnection

2009-12-22 Thread Larry Flesner


I don't think Aviation Products has a web site.  At least I couldn't 
find it.  There info is

Aviation Products Inc. (114 Bryant St. Ojai, CA 93023)  805-646-6042.

They have several models available.  You will want the lightest model 
which is a 4 inch wheel on a single fork.  You will have to determine 
if you want a unit to fit a flat tail spring or a rod and what the 
mount angle will be.  The unit I have is steerable through 30 degrees 
and then goes full swivel.  I personally think it is the best unit 
available on the market for the KR.  I use springs on my tail wheel 
hookup but I think Langford goes with cables only.  It will work 
either way.  I recall seeing photos of their available models with 
the spec's somewhere but I can't find them on the net.

As for toe-in, toe-out,  I don't think the Diehl gear has much flex 
fore and aft so I'd recommend going zero toe-in, toe-out.  Even with 
my 30 inch legs I have the wheels set at zero and it handles on the 
ground, takeoff and landing, as well as any tricycle gear.  I get 
zero uneven wear on the tires.  I think it is the ideal setup.

On the interconnect,  the rudder cables should be either spring 
loaded at the peddles or a closed loop system.  I went with the 
springs and it works well.  You will want your tail wheel cable to be 
just a wee bit slack so they allow the rudder cables to always be 
tight.  With this setup, any rudder input you need on takeoff / 
landing is applied equally to the tail wheel and the rudder.  With 
the wheel on the ground, it will be the controlling factor.  When it 
lifts off the ground, or before it settles on landing, you already 
have the correct input you need.  I can tell very little difference 
in the peddle movement needed for correction whether it is the tail 
wheel controlling or the rudder.

I'm not sure you could properly simulate in on X-Plane or other 
simulators as it will vary by the exact physical setup on each KR, 
ie. rudder size, tail wheel cable slack, fuselage length (rudder power), etc.

Builders can save themselves a lot of time by not trying to re-invent 
the wheel (no pun intended) and copy one of the many proven designs 
like mine, Langford's, Dan Heath's, or others.  I don't have any 
close up photos.  In the photo at 
http://mysite.verizon.net/flesner/lf103.jpg you can see it is a very 
standard installation.

As always, your results may vary.

Larry Flesner



KR> Tail wheel/rudder interconnection

2009-12-22 Thread Myron (Dan) Freeman
[quote] Of course, I like the breakaway that I have now, from Aviation
Products, much better than any other that I have ever had. Dan Heath



Hi Dan;



Do you have any pictures on your web site or a link to the Aviation Products
web site? I did a search but didn't find it.



Regards, 

Myron (Dan) Freeman 

Indpls, Ind. 46203-3570 

Home of the Indy 500, 

the World's most famous 

auto race. 

mfreem...@indy.rr.com 

? 


KR> Tail wheel/rudder interconnection

2009-12-22 Thread Barry Kruyssen
Hi Dan

With regards to your wheel alignment.

Never, ever should you have toe out.  TOE OUT IS BAD.
Let me explain (from what I know), a small amount of toe in is required as when 
the vehicle is moving forward, any movement (give, spring) in the suspension 
(and steering on cars) will result in the wheels pivoting backwards (every so 
slightly) and thus the wheels will end up parallel which is where we want them. 

Now with toe out you will find that the vehicle will veer (dive) left or right 
and when you correct it, it will over correct.  In cars (where I have most of 
my limited experience in wheel aligning) toe out makes it hard to drive a car 
straight on very smooth flat road, the car keeps wanting to wander.

Having a toe in of zero will most likely result in toe out when the vehicle is 
moving forwards.

Too much toe in will scrub the tyres causing unnecessary wear.

For more detail see may email in the archive 
http://www.maddyhome.com/krsrch/index.jsp dated 13 Feb 2008 and from 
k...@bigpond.com.

My one cents worth (down from 2 cents due to the recession).
As per normal, your results may differ and I'm no expert.

Regards

Barry Kruyssen
k...@bigpond.com 
http://athertonairport.com.au/kr2
RAA registered 19-3873
Australia


-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of 
Myron (Dan) Freeman
Sent: Wednesday, 23 December 2009 7:17 AM
To: KRnet
Subject: KR> Tail wheel/rudder interconnection



I encountered problems during takeoff and landing with the plane wanting to
drift left even with no crosswind and after checking the wheel alignment I
discovered that the wheels were misaligned to the left by several inches
(measured at a 10 foot distance) and were toed-in, this I am told is not
good, if anything they should be toed-out slightly.

Anyway, after correcting the wheel alignment the plane taxied straight and
true but after several harrowing takeoffs and landings in mild crosswind
conditions I knew that something else was wrong with it.






KR> Tail wheel/rudder interconnection

2009-12-22 Thread Dan Heath
Merry Christmas to you also Dan, and that is good news on your recovery.

I have had the plans type and the breakaway tail wheel, both steerable, and 
have had no issues with either.  Of course, I like the breakaway that I have 
now, from Aviation Products, much better than any other that I have ever had.  
I think Larry and Mark L. both use this one.  When the tail wheel is on the 
ground, the plane goes where I point it, and has with all the different ones 
that I have used.  Before I had the breakaway, I used expansion springs to the 
wheel, but with the breakaway, I have it connected directly.

See N64KR at http://KRBuilder.org - Then click on the pics 
See you at the 2010 - KR Gathering in Richmond, Ky - I39
There is a time for building and a time for FLYING and the time for Flying has 
begun.
Daniel R. Heath - Lexington, SC

-Original Message-


I don't know if there is anyone who is using a castering/locking tail wheel
on a KR but if there is I would like very much to hear their real world
input on this subject as well as those who use the plans style rudder/tail
wheel interconnection method. Your crosswind takeoff/landing technique would
be very informative to the rest of us.




KR> Tail wheel/rudder interconnection

2009-12-22 Thread Myron (Dan) Freeman
Hi guys and girls;

Before the unfortunate accident with Ol' Blue I made the comment that every
time I thought that I had everything fixed I always seemed to find something
else to fix or change on the plane.

One of the things that I hadn't got around to was the tail wheel/rudder
interconnection. I knew It wasn't right but I wasn't sure how to fix it.

I did a search on the KR net and found 500 or more references to tail wheel,
most of which didn't concern my question but with so many, I could have
missed it.

Anyway, before I purchased Ol' Blue I did a walk around and discovered that
the rudder seemed to be disconnected from the tail wheel and the rudder
peddles as well. I also noticed that when sitting in the pilot seat and
working the rudder peddles that the rudder did not move but the tail wheel
did, which helped explain why the previous owner used the brakes to keep the
plane straight during takeoff and landing, something that my instructor told
me never to do, your instructor may differ. 

So I knew something was not right and that I would have to do something
about it after the purchase. 

Well it was a simple fix, the tail wheel springs were drawn too tight and
the rudder cables were limp so I added extensions and that took care of that
 The rudder and tail wheel worked together in unison.

I encountered problems during takeoff and landing with the plane wanting to
drift left even with no crosswind and after checking the wheel alignment I
discovered that the wheels were misaligned to the left by several inches
(measured at a 10 foot distance) and were toed-in, this I am told is not
good, if anything they should be toed-out slightly.

Anyway, after correcting the wheel alignment the plane taxied straight and
true but after several harrowing takeoffs and landings in mild crosswind
conditions I knew that something else was wrong with it.

I have had a lot of time to think through the problem since the accident and
I noted that I had the same problem with the real plane as I did with my
X-Plane model. The conclusion was that when taking off or landing, until the
tail wheel leaves the ground, it is steering the plane down the runway for
the most part and if you have a crosswind you need to use rudder to
counteract the crosswind, but when you do, the tail wheel also turns and
steers you sideways which can result in a dangerous condition. So what to do
about it?

X-Plane continues to evolve and new features are added all the time and
recently a fully controllable tail wheel has been added, that is you can set
it up to behave anyway you want it to from full castering to locked straight
for takeoff or anything in between. So I said let the experimenting begin
and see what works best especially in a crosswind. Using X-plane is much
safer and quicker than using a test plane like Ol' Blue.

Now I already know how a tail dragger reacts when the tail wheel and rudder
are linked together with no slack, I considered it dangerous in a crosswind
on pavement, grass is more forgiving.

I've tried a full castoring tail wheel in X-Plane and for me I thought it
was dangerous also.

A tail wheel that is fixed straight ahead is too hard to maneuver on
taxiways so that just leaves a castoring/lockable tail wheel or a
steerable/lockable tail wheel I believe, unless I've forgotten something.

So I decided to use X-Plane to see which method worked the best and safest.

With X-Plane I can set the tail wheel to lock straight ahead by pulling any
up elevator input during takeoff or landing. In the real plane you would
have to lock it manually with a pull cable. But having flown my KR-2 model
in X-plane for several hundred hours now, I find it much easier to land and
takeoff in crosswinds with a locked tail wheel when on pavement, grass as I
said is more forgiving even in X-Plane.

I don't know if there is anyone who is using a castering/locking tail wheel
on a KR but if there is I would like very much to hear their real world
input on this subject as well as those who use the plans style rudder/tail
wheel interconnection method. Your crosswind takeoff/landing technique would
be very informative to the rest of us.

Here is a link to some who have had experience with it. 

http://www.mombu
com/aviation/aviators/t-advice-on-flying-pitts-with-haigh-locking-tailwheel-1
68451.html

I could only find two brands of locking tail wheels, the Raven and the Haigh
but I'm sure some enterprising individual could design and build one more
appropriate for a KR and a whole lot cheaper and share the design with the
KR group if it was worth while.

Also, I have two X-Plane, version 9.31, KR-2 models available with this new
feature for anyone who wants to try them, or I can just send them to the
several dozen individuals who are already using the older models.

Oh, and the doctor said I can drive again and start walking on my left foot,
praise the Lord.

Have a Merry Christmas and a Happy New Year everybody. 

Regards, 

Myron (Dan) Freeman 


KR> COOLING ISSUES SORTED

2009-12-22 Thread Darren Crompton
Hi Dene,

Sounds interesting.  Can you talk more about the outlet position and what
area is working for you? Some photos of this and the oil cooler scoop would
be great to see too.


Cheers
-- 
Darren Crompton
AUSTRALIA

My building site: www.kr-2s.com
AN-BOLTS  www.an-bolts.com.au