KR> Landing Gear legs

[Stef den Boer]

Hi Stan,

We use the old type landing gear. It is all 7075T6 alluminium. 3 brackets aft of
the fwd spar. I think this one give you more propclearce.

I think the aluminium gear is more weight than the new glass system.

On my website you see 3 KR2s. The PH-OMI and the PH-MIJ uses the old aluminium.
The PH- KRS is using the new system. At the page flight controlls you see the 3
brackets.

Stef


> 
> Op 2 september 2016 om 4:43 schreef Mark Langford via KRnet
> :
> 
> 
> Stan wrote:
> 
> > I was looking in to the landing gear for a Kr2S
> > Would I be ahead to bend something like this in the press brake or go
> > the Deli Gear route?
> 




> 
> been a function of loading though. That's all I can offer you on that
> comparison...no real facts.
> 
> See http://www.n56ml.com/kgear.html for more on what Diehl gear looks
> like. nvAero sells them now, as well as Scotchply gear legs.
> 
> Mark Langford
> ML at N56ML.com
> http://www.n56ml.com
> 
> 
> ___
> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search.
> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org
> please see other KRnet info at http://www.krnet.org/info.html
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> options
> slight amount more damping. That might have
> 

Steph and his dad are building the KR-2S see http://www.masttotaalconcept.nl/kr2
http://www.masttotaalconcept.nl/kr2

KR> Landing Gear legs

[Mark Langford]

Stan wrote:

 > I was looking in to the landing gear for a Kr2S
 > Would I be ahead to bend something like this in the press brake or go
 > the Deli Gear route?

The Diehl gear consists of two cast aluminum spar brackets, two lower 
axle attach brackets, and two Scotchply fiberglass gear legs connecting 
the two.

I don't have personal experience with the aluminum gear legs, which is 
why I haven't piped up on this until now.  But I do know somebody that 
had it, Troy Petteway.  I believe his plane used the normal spar 
castings, but he used aluminum gear legs. He got them from Steve 
Bennett.  That way there's no bending involved.  He did manage to break 
one in an engine-out landing on curvy road, but I have also broken a 
Scotchply gear in a similar situation.  My first landing was 5.5g's, so 
they were already proven to exceed the design parameters.

  It obviously works, but I wouldn't want to put a continuous aluminum 
gear leg under my plane unless I'd built a bunch of them and they tested 
with no failures (think minimum bend radius stuff), or somebody else had 
done the same.  Grove Aircraft makes bent aluminum gear that is one 
piece, and I'm pretty sure Rand Robinson sold something similar, if not 
exactly that. See http://www.groveaircraft.com/landing_gear.html for 
plenty of options. They also sell aluminum gear legs that could be used 
with spar brackets.

Troy's opinion was that the aluminum was more springy than the 
Scotchply, which has some slight amount more damping. That might have 
been a function of loading though.  That's all I can offer you on that 
comparison...no real facts.

See http://www.n56ml.com/kgear.html for more on what Diehl gear looks 
like.  nvAero sells them now, as well as Scotchply gear legs.

Mark Langford
ML at N56ML.com
http://www.n56ml.com

KR> Landing Gear legs

[Tommy Waymack]

With extensive mods all bets are off.Good luck.Both options are good.Tommy W

On Wed, Aug 31, 2016 at 9:11 PM, Global Solutions via KRnet <
krnet at list.krnet.org> wrote:

> Hi Folks
> I was looking in to the landing gear for a Kr2S. The boat is going to be
> 6" wider then the stock plans.
> I was looking at the NVaero site and they have the castings for the Deli
> gear which because they have no picture I am guessing I would still need to
> make the actual legs. they also do not specify if the castings they sell
> are priced each or for the pair.
> I then came across this which is made from Material: 7075-T6 Aluminum
> KR2 One Piece Landing Gear
> The airport I have access to for the moment is a grass strip and I was
> thinking the aluminum may act as a bit of a shock suppressor and may be
> lighter then the wood/glass that others have used.
> Would I be ahead to bend something like this in the press brake or go the
> Deli Gear route?
>
> Also I was thinking of going with MATCO brakes as per NVAERO or am I
> better off with Cleveland or some other brand. I also noted on Mark
> Landfords site that he played with wheel sizes. What is the overall
> consences with respect to tire size?
>
> Thanks
> Stan
>
>
>
> ___
> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search.
> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org
> please see other KRnet info at http://www.krnet.org/info.html
> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change
> options
>

KR> Landing Gear legs

[Global Solutions]

Hi Folks
I was looking in to the landing gear for a Kr2S. The boat is going to be 
6" wider then the stock plans.
I was looking at the NVaero site and they have the castings for the Deli 
gear which because they have no picture I am guessing I would still need 
to make the actual legs. they also do not specify if the castings they 
sell are priced each or for the pair.
I then came across this which is made from Material: 7075-T6 Aluminum
KR2 One Piece Landing Gear
The airport I have access to for the moment is a grass strip and I was 
thinking the aluminum may act as a bit of a shock suppressor and may be 
lighter then the wood/glass that others have used.
Would I be ahead to bend something like this in the press brake or go 
the Deli Gear route?

Also I was thinking of going with MATCO brakes as per NVAERO or am I 
better off with Cleveland or some other brand. I also noted on Mark 
Landfords site that he played with wheel sizes. What is the overall 
consences with respect to tire size?

Thanks
Stan

KR> LANDING GEAR LEGS

[Sid Wood]

Concur with Larry Flesner regarding using the Yankee gear legs.
You will need a power bench planer to take the stock thickness down to 3/4 
inch.  The fiberglass is abrasive and will dull the planer blades somewhat. 
A metal cutting band saw will do well for cutting the outline.  Getting a 
consistent leg shape can be difficult to achieve without a pattern and pin 
router.  Of concern for the leg shape is getting the correct cant forward 
for tail dragger legs or cant aft for nose wheel installations.  I used 20 
inches for the main wheel location aft of the leading edge of the stub wing. 
With the dog-leg shape, it is not possible to keep the fiberglass grain 
completely straight the entire length of the leg.  Wrapping with 45 degree 
bias fiberglass cloth will definitely help regarding the twisting action. 
Beware of the fiberglass splinters that the planer and saw will create; sand 
every edge smooth to keep those glass splinters out of your hide.
I have my home-built gear legs installed.  Empty weight is 804 pounds 
including ballast.
Worrying about balance issues now.

Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA


--
At 10:56 PM 12/12/2014, you wrote:
>The Yankee leg is 1" thick and I've heard estimates of 3/4" to 1"
>and about 3" wide for the Diehl.  A little change in the thickness
>and stack can make a big difference in the stiffness.


If I were to use the "Yankee" gear leg, I'd have someone send me a
tracing of the Diehl leg on heavy stock, cut the Yankee leg to same
profile keeping the "grain orientation" the same as the Deihl leg,
plane down the leg to the same thickness as the Diehl leg, put a foam
lead and trail edge on the leg for shaping and a tunnel for brake
line, and wrap with two layers of KR cloth.  Put the KR cloth on the
leg "on the bias", 45 degree angle.  I would go with a 25" leg on a
KR2 and a 26 1/2" leg on the 2S (tail dragger) and make any
adjustments to the the three point stance with the tail wheel
spring.  Tri-gear will have to stick with the 24" leg unless
modifying the nose gear assembly.

I was led to believe the Diehl gear material is the same material as
the Yankee gear.  Dan did the testing, including drop test I was
told,  and his setup works just fine.  I wouldn't change a thing.  If
you are building to fly and not as a project for your retirement, go
with what we know works and spend your worry time on other parts of
the project.  I'm still smiling from yesterdays 50 mile flight for
lunch and stop and go landing practice on return.  Get it
built..

Larry Flesner

KR> LANDING GEAR LEGS

[Flesner]

At 10:56 PM 12/12/2014, you wrote:
>The Yankee leg is 1" thick and I've heard estimates of 3/4" to 1" 
>and about 3" wide for the Diehl.  A little change in the thickness 
>and stack can make a big difference in the stiffness.


If I were to use the "Yankee" gear leg, I'd have someone send me a 
tracing of the Diehl leg on heavy stock, cut the Yankee leg to same 
profile keeping the "grain orientation" the same as the Deihl leg, 
plane down the leg to the same thickness as the Diehl leg, put a foam 
lead and trail edge on the leg for shaping and a tunnel for brake 
line, and wrap with two layers of KR cloth.  Put the KR cloth on the 
leg "on the bias", 45 degree angle.  I would go with a 25" leg on a 
KR2 and a 26 1/2" leg on the 2S (tail dragger) and make any 
adjustments to the the three point stance with the tail wheel 
spring.  Tri-gear will have to stick with the 24" leg unless 
modifying the nose gear assembly.

I was led to believe the Diehl gear material is the same material as 
the Yankee gear.  Dan did the testing, including drop test I was 
told,  and his setup works just fine.  I wouldn't change a thing.  If 
you are building to fly and not as a project for your retirement, go 
with what we know works and spend your worry time on other parts of 
the project.  I'm still smiling from yesterdays 50 mile flight for 
lunch and stop and go landing practice on return.  Get it 
built..

Larry Flesner 

KR> LANDING GEAR LEGS

[Mark Langford]

See http://www.n56ml.com/gear/broken_leg.jpg (or attached) for the 
structure of the Deihl gear leg.  Definitely unidirectional, so a little 
something to tie the strands together couldn't hurt.

Mark Langford
ML at N56ML.com
http://www.n56ml.com

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KR> LANDING GEAR LEGS

[Flesner]

At 06:16 PM 12/10/2014, you wrote:
>On the KR2S I'd cut them to no less than 26" and more likely, 28" 
>for a better three point attitude on the ground.
+++

That's with a tail wheel, not a nose dragger.  Nose wheel using Diehl 
nose gear setup will have to stick with the 24" leg.

Larry Flesner 

KR> LANDING GEAR LEGS

[Flesner]

At 12:23 PM 12/10/2014, you wrote:
>The Grumman gear is also a lot wider to start with than the Diehl 
>gear which is why they don't twist.
>

Based on my experience with 30" Diehl gear legs, if I were using the 
Yankee gear legs I would cut them to the same shape and dimensions as 
the Diehl legs, and wrap them with one or two layers of KR cloth to 
add foam on lead and trail edge to shape and run brake lines.  On the 
KR2S I'd cut them to no less than 26" and more likely, 28" for a 
better three point attitude on the ground.  I feel my gear at 30" is 
just right for my slightly longer KR over the 2S.  My KR is 765 
pounds empty and I routinely fly at 1065 to 1100 pounds gross and 
have on occasion flown  as heavy as 1250 to 1300 pounds.  The flex 
seems to be just right without being too springy.  I have video shot 
from the belly back by the tail showing the gear during takeoff and 
landing and they seem to flex no more than maybe 2 or 3 inches at the 
wheel.  They handle just fine on grass strips also.

Your results may vary...

Larry Flesner 

KR> LANDING GEAR LEGS

[Sid Wood]

The wrap also allows you to to put some foam streamlining on the leading and 
trailing edges plus letting you embed a plastic soda straw conduit for a 
brake line.

Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA


The reason the?Diehl gear legs are wrapped is because the legs have a 
tendency to twist when the brakes are applied. ?So the glass stiffens to 
legs. With our legs being 1" thick we may not need to wrap them.

Paul Visk
Belleville I'll
618-406-4705?

KR> LANDING GEAR LEGS

[Ronald Wright]

The Grumman gear is also a lot wider to start with than the Diehl gear which is 
why they don't twist.

On Wed, 12/10/14, Sid Wood via KRnet  wrote:

 Subject: Re: KR> LANDING GEAR LEGS
 To: krnet at list.krnet.org
 Date: Wednesday, December 10, 2014, 12:08 PM

 The wrap also allows you to to put
 some foam streamlining on the leading and 
 trailing edges plus letting you embed a plastic soda straw
 conduit for a 
 brake line.

 Sid Wood
 Tri-gear KR-2 N6242
 Mechanicsville, MD, USA
 

 The reason the?Diehl gear legs are wrapped is because the
 legs have a 
 tendency to twist when the brakes are applied. ?So the glass
 stiffens to 
 legs. With our legs being 1" thick we may not need to wrap
 them.

 Paul Visk
 Belleville I'll
 618-406-4705?





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KR> LANDING GEAR LEGS

[Tony King]

Yep.  Just mark them out with a Sharpie, cut them on a sawbench and round
the edges with a router.  Once you've done that just follow the same steps
as for the 'standard' legs - i.e. wrap them with fibreglass, etc.

The Grumman legs are thicker than the 'standard' legs - by about 1/4" I
think.  I'm still thinking about whether to leave them thicker (to make
them a bit stiffer at the 600kg MTOW I'm aiming for) or plane them down to
the normal thickness.

Cheers,

Tony

On 10 December 2014 at 08:23, ol' weirdo via KRnet 
wrote:

> Has anyone cut down and used Grumman Yankee surplus landing gear legs for
> his/her KR2?
> And if you did, how did you do it?
>
> Bill Weir
> ___
> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search.
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> options
>

KR> LANDING GEAR LEGS

[ppaulvsk]

The reason the?Diehl gear legs are wrapped is because the legs have a tendency 
to twist when the brakes are applied. ?So the glass stiffens to legs. With our 
legs being 1" thick we may not need to wrap them.

Paul Visk
Belleville I'll
618-406-4705?


Sent from my Samsung Galaxy S?4

 Original message 
From: Dan via KRnet  
List-Post: krnet@list.krnet.org
Date:12/10/2014  12:18 AM  (GMT-06:00) 
To: 'ol' weirdo' ,'KRnet'  
Subject: Re: KR> LANDING GEAR LEGS 

Bill, 

Sure have.? Kept them at 1" thick.? If you want I can send you the drawings
of the legs, photos and the bracket CAD.? Email me at dprich01 at comcast.net .
As the plane sits right now with me in it there is about .5" deflection.
I'm not sure why folks wrap the legs in fiberglass.? Grumman doesn't.

Dan Prichard
Portland Oregon

-Original Message-
From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of ol' weirdo
via KRnet
Sent: Tuesday, December 09, 2014 2:23 PM
To: krnet at list.krnet.org
Subject: KR> LANDING GEAR LEGS

Has anyone cut down and used Grumman Yankee surplus landing gear legs for
his/her KR2?
And if you did, how did you do it?

Bill Weir
___
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options

KR> LANDING GEAR LEGS

[Dan]

Bill, 

Sure have.  Kept them at 1" thick.  If you want I can send you the drawings
of the legs, photos and the bracket CAD.  Email me at dprich01 at comcast.net .
As the plane sits right now with me in it there is about .5" deflection.
I'm not sure why folks wrap the legs in fiberglass.  Grumman doesn't.

Dan Prichard
Portland Oregon

-Original Message-
From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of ol' weirdo
via KRnet
Sent: Tuesday, December 09, 2014 2:23 PM
To: krnet at list.krnet.org
Subject: KR> LANDING GEAR LEGS

Has anyone cut down and used Grumman Yankee surplus landing gear legs for
his/her KR2?
And if you did, how did you do it?

Bill Weir
___
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options

KR> LANDING GEAR LEGS

[ol' weirdo]

Has anyone cut down and used Grumman Yankee surplus landing gear legs for
his/her KR2?
And if you did, how did you do it?

Bill Weir

KR> LANDING GEAR LEGS

[ol' weirdo]

Has anyone made landing gear legs from the fiberglass rear springs that
Pontiac used on vans a while ago?

Bill Weir

KR> LANDING GEAR LEGS - Pontiac Leaf Springs

[Peter Johnson]

Hi Bill.

I took a pair of the springs and tested them for flex.  They would have been 
a bit soft, but quite doable with some additional wrapping.

I wrote of the efforts some years ago, along with concerns for converting 
the springs to gear legs.  You'll have to search the archives.


Peter Johnson
Kenora, Ontario




- Original Message - 
From: "ol' weirdo via KRnet" 
To: 
Sent: Friday, July 04, 2014 7:43 AM
Subject: KR> LANDING GEAR LEGS


> Has anyone made landing gear legs from the fiberglass rear springs that
> Pontiac used on vans a while ago?
>
> Bill Weir
> ___
> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search.
> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org
> please see other KRnet info at http://www.krnet.org/info.html
> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change 
> options 

KR> landing gear legs and brackets

[Becky Carpenter]

Hi, is the landing gear retractable? And how much are you asking for it
Thanks, Becky

> On Jul 2, 2014, at 5:14 PM, Brad Ankerstar via KRnet  list.krnet.org> wrote:
> 
> I could not find the original requester, but I have a complete set of Diehl
> landing gear parts to include the axles, wheels, tires, tubes, brakes, and
> brackets (slightly used and still assembled) plus master cylinders for the
> mains as well as the entire nose gear which is damaged (strut broke) and
> mounting bracket bent.   This could save someone a lot of time if you don't
> mind a little repair and fabrication.  Items are from N774A which was
> destroyed on its first test flight.  Power loss.  Parts are located in SW
> Ohio.
> 
> If you are interested I'd be happy to email photos.
> 
> Brad Ankerstar
> ankerstarb at embarqmail.com
> (513) 313-9265 cell
> 
> 
> 
>> -Original Message-
>> From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Flesner
>> via KRnet
>> Sent: Wednesday, July 02, 2014 5:22 PM
>> To: Dan Prichard; KRnet
>> Subject: KR> landing gear legs and brackets
>> 
>> 
>> 
>> 
>>>> Could someone tell me the angle of the Diehl main gear brakets? I
>>> intend to make my own. I also remember a post  regarding composite
>>> legs that some of you had used. Any idea if they might still be
>>> available ? ps at what position are the mounting brackets attached to
>>> the main spar? Thanks Mark
>> options
> 
> 
> ___
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KR> landing gear legs and brackets

[Tony King]

Hi Larry,

Thanks for that comprehensive overview.  It was very helpful.

Cheers,

Tony


On 3 July 2014 07:21, Flesner via KRnet  wrote:

>
>
>
>  > Could someone tell me the angle of the Diehl main gear brakets? I
>> intend to make my own. I also remember a post  regarding composite legs
>> that some of you had used. Any idea if they might still be available ? ps
>> at what position are the mounting brackets attached to the main spar?
>> Thanks Mark
>>
> 
> 
>
>> You can find the fiberglass legs on eBay. Aviation parts/ Grumman tiger
>> undrilled. Contact me direct and ill sen you photos of my setup with PDFs
>> of drawings. I'm also using the legs cut down for the front gear.
>> Dprich01 at comcast.net
>>
> 
> +++
>
> The Diehl upper brackets are mounted to the spar with the leg angled at 45
> degrees.  The lower bracket is also 45 degrees.  If you want to increase
>  the camber a bit I'd suggest you modify the lower fitting a bit to the
> angle you want.  I went with 45 / 45 and it has worked out well for me.
>  The Grumman gear legs are made of the same material as the Diehl legs but
> are slightly thicker and wider.  You will have to modify them a bit to get
> similar results, i.e., cut a bit narrower or run through a planner to
> modify the thickness.  Some builders make upper gear brackets using 1/8"
> steel plate. I added about 1/8" of fiberglass to my 30 inch legs for a bit
> more stiffness.  If you use the Grumman legs with more than 24" length I'd
> suggest leaving them a bit thicker than the 24" Diehl leg.  With my 24"
> fuselage stretch I needed longer legs to get the correct 3 point stance.
>
>   https://dl.dropboxusercontent.com/u/32133949/IMG_8669.JPG
>
>  I made my lower brackets using a piece of 2"X6"X1/4" 4130 steel plate.  I
> cut through the plate at center going about 3/4 of the way through the
> metal.  I bent the plate at the cut to 45 degrees with the cut on the
> outside.  I had a gusset welled to the inside and had the cut welded shut
> and then sanded the weld to a nice radius.  I think the Diehl lower bracket
> is 2 1/2 inches wide.  http://myplace.frontier.com/~flesner/21.jpg
>
> Diehl instructions say to mount the upper brackets next to the fuselage.
>  I moved my brackets outboard 4 to 6 inches on each side for a slightly
> wider gear stance.  That and 30 inch legs instead of the Diehl 24 inch legs
> give me a nice 8 foot wide gear track.
>
> There is much discussion about  "toe-in, toe-out".  I set my track at zero
> / zero and love the ground handling and I get zero tire side ware. I also
> run a slightly lower tire pressure (25 pounds) than some and my tires seem
> to last forever.  On an annual once I found them both to have deflated to
> 15 pounds each.  They still looked and  performed perfectly normal although
> I'd not recommend running them below the 25 pound range if possible or
> unusual side loads might cause a problem.  Keep the aircraft aligned with
> the direction of travel when on the ground and that won't be an issue. :-)
>  500+ hours and still wearing the KR grin
>
> Larry Flesner
>
>
>
> ___
> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search.
> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org
> please see other KRnet info at http://www.krnet.org/info.html
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> options
>

KR> landing gear legs and brackets

[Flesner]

> > Could someone tell me the angle of the Diehl main gear brakets? I 
> intend to make my own. I also remember a post  regarding composite 
> legs that some of you had used. Any idea if they might still be 
> available ? ps at what position are the mounting brackets attached 
> to the main spar? Thanks Mark

>You can find the fiberglass legs on eBay. Aviation parts/ Grumman 
>tiger undrilled. Contact me direct and ill sen you photos of my 
>setup with PDFs of drawings. I'm also using the legs cut down for 
>the front gear.
>Dprich01 at comcast.net
+++

The Diehl upper brackets are mounted to the spar with the leg angled 
at 45 degrees.  The lower bracket is also 45 degrees.  If you want to 
increase  the camber a bit I'd suggest you modify the lower fitting a 
bit to the angle you want.  I went with 45 / 45 and it has worked out 
well for me.  The Grumman gear legs are made of the same material as 
the Diehl legs but are slightly thicker and wider.  You will have to 
modify them a bit to get similar results, i.e., cut a bit narrower or 
run through a planner to modify the thickness.  Some builders make 
upper gear brackets using 1/8" steel plate. I added about 1/8" of 
fiberglass to my 30 inch legs for a bit more stiffness.  If you use 
the Grumman legs with more than 24" length I'd suggest leaving them a 
bit thicker than the 24" Diehl leg.  With my 24" fuselage stretch I 
needed longer legs to get the correct 3 point stance.

   https://dl.dropboxusercontent.com/u/32133949/IMG_8669.JPG

  I made my lower brackets using a piece of 2"X6"X1/4" 4130 steel 
plate.  I cut through the plate at center going about 3/4 of the way 
through the metal.  I bent the plate at the cut to 45 degrees with 
the cut on the outside.  I had a gusset welled to the inside and had 
the cut welded shut and then sanded the weld to a nice radius.  I 
think the Diehl lower bracket is 2 1/2 inches 
wide.  http://myplace.frontier.com/~flesner/21.jpg

Diehl instructions say to mount the upper brackets next to the 
fuselage.  I moved my brackets outboard 4 to 6 inches on each side 
for a slightly wider gear stance.  That and 30 inch legs instead of 
the Diehl 24 inch legs give me a nice 8 foot wide gear track.

There is much discussion about  "toe-in, toe-out".  I set my track at 
zero / zero and love the ground handling and I get zero tire side 
ware. I also run a slightly lower tire pressure (25 pounds) than some 
and my tires seem to last forever.  On an annual once I found them 
both to have deflated to 15 pounds each.  They still looked 
and  performed perfectly normal although I'd not recommend running 
them below the 25 pound range if possible or unusual side loads might 
cause a problem.  Keep the aircraft aligned with the direction of 
travel when on the ground and that won't be an issue. :-)  500+ hours 
and still wearing the KR grin

Larry Flesner