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Crack by landing gear?

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Robert Reed

Joined: 22 Oct 2009
Posts: 331
Location: Dallas/Ft.Worth

Posted: Mon Jun 06, 2016 3:04 pm Post subject: Crack by landing gear?

ALL,

Steve McIntosh has a KIS TR-1 that has developed a problem with a crack across the fuselage where the landing gear attaches.  I am not at all familiar with the gear attachment on the TR-1.  Can anybody give some advice on what, why, and what to do about it?  The photo is attached but is difficult to see and besides, I don't know for sure what I am looking at

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aeromomentum(at)yahoo.com
Guest

Posted: Mon Jun 06, 2016 4:21 pm Post subject: Crack by landing gear?

The center part of the main gear should be free to flex downward when the gear compresses (and a little upward on rebound).



So the cracking looks like it is in filler that really should not be there.



--------------------------------------------

On Mon, 6/6/16, Robert Reed <robertr237(at)att.net> wrote:



 Subject: Fw: Crack by landing gear?

 To: "Kisbuilders" <kis-list(at)matronics.com>

 Date: Monday, June 6, 2016, 7:00 PM

 

 

 

    

 ALL,

 Steve McIntosh has a KIS TR-1 that has developed a

 problem with a crack across the fuselage where the landing

 gear attaches.  I am not at all familiar with the gear

 attachment on the TR-1.  Can anybody give some advice

 on what, why, and what to do about it?  The photo is

 attached but is difficult to see and besides, I don't

 know for sure what I am looking at.

 Bob Reed  

 ----- Forwarded Message -----

  From:

 "pastormac(at)comcast.net"

 <pastormac(at)comcast.net>

  To: Robert

 Reed <robertr237(at)att.net> 

  Sent: Monday,

 June 6, 2016 5:20 PM

  Subject: Crack by

 landing gear?

    

 Hi Bob,

 A crack has developed in front of the landing gear all the

 way across the fuselage. It looks like filler or bonds. I

 wanted to try and clean it out, but wasn't for sure if

 there is a gap between the landing gear and actual Composite

 body of the plane. I've attached a picture. Can you

 help??

 Steve

 

 

 Sent from my iPhone

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hans.erstad(at)gmail.com
Guest

Posted: Mon Jun 06, 2016 10:06 pm Post subject: Crack by landing gear?

Steve

The filler didn't need to be there at all. When the landing gear flexes on landing/bumps, the middle section of the bar flexes down making the crack.

The filler or whatever it is should be removed, but it is maybe not an easy job if you did not build it.  Must be careful to not cut into the fuselage structure - then you have a real problem!  At the moment there is not real problem.  It just does not look nice.

Consult the drawings in the builder manual to get an understanding of how the fuselage structure looks like in that area, and how the landing gear bar is attached.  Hard to explain with words, but I am sure there are good drawings in the manual.

Hans Christian  TR-1#32

2016-06-07 1:00 GMT+02:00 Robert Reed <robertr237(at)att.net (robertr237(at)att.net)>:

 	  Quote: 	
		  



    

ALL,

Steve McIntosh has a KIS TR-1 that has developed a problem with a crack across the fuselage where the landing gear attaches.  I am not at all familiar with the gear attachment on the TR-1.  Can anybody give some advice on what, why, and what to do about it?  The photo is attached but is difficult to see and besides, I don't know for sure what I am looking at.

Bob Reed

  



----- Forwarded Message -----

 From: "pastormac(at)comcast.net (pastormac(at)comcast.net)" <pastormac(at)comcast.net (pastormac(at)comcast.net)>

 To: Robert Reed <robertr237(at)att.net (robertr237(at)att.net)> 

 Sent: Monday, June 6, 2016 5:20 PM

 Subject: Crack by landing gear?

  

 



Hi Bob,

A crack has developed in front of the landing gear all the way across the fuselage. It looks like filler or bonds. I wanted to try and clean it out, but wasn't for sure if there is a gap between the landing gear and actual Composite body of the plane. I've attached a picture. Can you help??

Steve

Sent from my iPhone

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Fri Jun 10, 2016 2:29 pm Post subject: Crack by landing gear?

6/10/2016



Hello Steve McIntosh, On Monday, June 6, 2016 5:20 PM you wrote: "A crack 

has developed in front of the landing gear all the way across the fuselage. 

It looks like filler or bonds." and "Can you help??"



On Jun 6, 2016, at 9:50 PM OC wrote: "Ahhhh, the ugly underbelly of the KIS 

TR-1." and "The next time I am at the hangar I'll try to remember to take a 

picture of that area on my plane

and post it."



Attached are three pictures of the underbelly of my KIS TR-1. Below are some 

comments:



A) Picture 001: Looking aft. At the far left and right edges of the picture 

are the top end of the Van's RV fairings that cover my main landing gear 

legs. Also note the water drain holes in the bottom of the fuselage. Please 

ignore the greasy dirt.



B) Picture 004: Looking towards the right wing. You can see that a bit of 

the black rubber pad that I installed between the top of the main landing 

gear cross piece and the bottom of the groove in the fuselage has managed to 

work its way forward. The aft edges of the Van's RV gear leg fairings are 

held together by one machine screw at the top end then white tape that the 

glider people use to tape their aircraft together in order to go flying the 

rest of the way down.



C) Picture 006: Looking towards the left wing. Note the addition of vinyl 

tubing over the plastic brake line to protect the brake line from chafing.



There must be some way to cover up that whole ugly scene with a fiberglass 

shield, but I have pretty much given up attempting to do so. Certainly 

stuffing Bondo into the space between the edges of the main landing gear 

cross piece and the fuselage bottom is not the way to go.



Any questions?



OC



================================================



 	  Quote: 	
		   On Jun 6, 2016, at 9:50 PM, Owen Baker <bakerocb(at)cox.net> wrote:



 6/6/2016



 Hello To All, Steve McIntosh wrote:



 1) ".... wasn't for sure if there is a gap between the landing gear and 

 actual Composite body of the plane."



 Yes,  there is supposed to be a gap there. Like Mark wrote, the center 

 part needs to flex.



 2) " I wanted to try and clean it out,"



 Ahhhh, the ugly underbelly of the KIS TR-1. I thought long and hard about 

 how to cover

 or conceal the underbelly of my plane in the area of the landing gear 

 mounting. Finally decided to just

 live with it. If someone wants to crawl under there and examine it I will 

 be happy to provide a flashlight

 and let them.**



 Trying to beautify that area by stuffing some rigid filler material into 

 the space between the main gear

 cross piece and the fuselage bottom is a losing proposition -- you can 

 either clean it out or ignore it. If

 you decide to clean it out be careful to not damage either the gear or the 

 fuselage.



 OC



 **PS: The next time I am at the hangar I'll try to remember to take a 

 picture of that area on my plane

 and post it.


	


 	  Quote: 	
		   =========================================================


	


 	  Quote: 	
		   From: "pastormac(at)comcast.net" <pastormac(at)comcast.net>

 To: Robert Reed <robertr237(at)att.net>

 Sent: Monday, June 6, 2016 5:20 PM

 Subject: Crack by landing gear?



 Hi Bob,

 A crack has developed in front of the landing gear all the way across the 

 fuselage. It looks like filler or bonds. I wanted to try and clean it out, 

 but wasn't for sure if there is a gap between the landing gear and actual 

 Composite body of the plane. I've attached a picture. Can you help??

 Steve

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Sat Jun 11, 2016 4:01 am Post subject: Crack by landing gear?

6/11/2016



Hello Tim, Thanks for the posting. That looks great – the best that I have 

seen.



1) What do the attaching machine screws thread into on the fuselage in 

picture 002?



2) How did you make the bubble over the bolts holding the gear on in picture 

005?



3) How did you make the fairing where the gear leg enters the fuselage in 

picture 002?



4) How about some pictures and a few words about your wing to fuselage 

fairings?



Thanks,



OC



======================================



From: Tim Yoder

Sent: Friday, June 10, 2016 8:02 PM

To: OC Baker

Subject: Emailing: 002 (12).jpg



Hi OC,



I covered my gear with a piece of .025" or .032" aluminum also the wing to

fuselage.



Tim N52TY

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Mon Jun 13, 2016 6:05 pm Post subject: Crack by landing gear?

6/13/2016



Hello Tim, Thanks for the response and the photos. You wrote:



1) "I just pop riveted them in through the inner fuselage skin."



Very clever. What installation sequence did you follow to ensure that the 

anchor nuts

would eventually be accurately placed where the holes in the aluminum panels 

are?



I may have to reconsider placing some similar panels on my plane. I am 

thinking along the

line of riveting anchor nuts to one inch square pieces of sheet aluminum or 

thin flat panel

fiber glass and then using epoxy to fasten the squares in place in the 

fuselage interior.



2) "None of them have failed in the last 18 years."



Good show.



OC



PS:

How many hours do you have on your plane? I have been flying for about 12 

1/2 years (first flight

in Nov 2003) and have just gone over 500 hours.



====================================



From: Tim Yoder

Sent: Monday, June 13, 2016 5:25 PM

To: OC Baker

Subject: Emailing: 52TY 001.jpg



Hello OC,



These aren't the best photos but you can see 5 anchor nuts In the first

photo and 2 in the second. I just pop riveted them in through the inner

fuselage skin. None of them have failed in the last 18 years. I will send

two more photos of the fairings, a total of seven pieces.



Tim

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