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tie down alternative

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occom

Joined: 26 Aug 2006
Posts: 404

Posted: Tue Sep 29, 2009 7:57 am Post subject: tie down alternative

The small loop on the front strut attach point for  one of my wings has been broken off. I do not wish to attempt to replace or  repair it, I would like to make a small strap affair of fairly thick/strong  aluminum and place it under the bolt, using a longer bolt as required.. Advice?  

  

  

  

 Dave Goddard

KF IV 1050 / 582 /  Warp

   [quote][b]

larry huntley

Joined: 19 Jul 2008
Posts: 149

Posted: Tue Sep 29, 2009 8:43 am Post subject: tie down alternative

I would use a piece of 4130 if this is the tiedown  ring. Even then they can break off. If you tie down safely you run the rope  through that and over the strut,but still good to have it strong.    Larry

 [quote]   ---

_________________
Larry Huntley,Dundee,NY
Kitfox 4-1200 N234EE
EA81,AMAX Redrive Warp 3 blade

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Tue Sep 29, 2009 8:43 am Post subject: tie down alternative

You wouldn't even need a loop. Just an appropriately shaped strap of  

1/16" stainless steel, maybe an inch wide, with a hole drilled in one  

end for the attach point under the strut bolt, and a hole in the  

other end for a tie-down hook.  If the hole for the hook is 3/8", and  

you centered that hole 1/2" in from the end, you would have 5/16" of  

material surrounding the hole on the tension end.....lots of room for  

wear due to rocking in the wind while tied down. Stainless steel  

would not weigh that much more than aluminum, and would wear much  

longer. You might not even have to lengthen the attaching  

bolt....depends on the amount of threads showing right now.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 782.2 hrs

Countdown to 1000 hrs~218 to go

Sensenich 62"x46" Wood prop

Electroair direct-fire ignition system

Rotec TBI-40 injection

Status: flying

On Sep 29, 2009, at 11:54 AM, Dave G wrote:



 	  Quote: 	
		   The small loop on the front strut attach point for one of my wings  

 has been broken off. I do not wish to attempt to replace or repair  

 it, I would like to make a small strap affair of fairly thick/ 

 strong aluminum and place it under the bolt, using a longer bolt as  

 required.. Advice?



 Dave Goddard

 KF IV 1050 / 582 / Warp

 ============================================================ _- 

 ============================================================ _- 

 contribution_- 

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

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

kirkhull(at)kc.rr.com
Guest

Posted: Tue Sep 29, 2009 1:59 pm Post subject: tie down alternative

Stratus makes one  

         

  

From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Dacha

 Sent: Tuesday, September 29, 2009 3:10 PM

 To: kitfox-list(at)matronics.com

 Subject: Re: tie down alternative  

  

     

Has anyone a series 5 engine mount for a e-81?  

    

LeRoy  

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       [quote][b]

occom

Joined: 26 Aug 2006
Posts: 404

Posted: Wed Sep 30, 2009 2:23 am Post subject: tie down alternative

I guess this is what you have in mind. That'll work fine!

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Wed Sep 30, 2009 5:26 am Post subject: tie down alternative

Yeah, something like that. That is a Tang, and they come in various  

shapes and sizes in 304 stainless, from Spruce. I thought I had a  

picture of my installation, but apparently not. When I tie down, I  

have a 5/16" or so, diameter hardware store "S" hook that I slip  

through the hole, and this takes the chaffing off the rope.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 782.2 hrs

Countdown to 1000 hrs~218 to go

Sensenich 62"x46" Wood prop

Electroair direct-fire ignition system

Rotec TBI-40 injection

Status: flying

On Sep 30, 2009, at 6:16 AM, Dave G wrote:



 	  Quote: 	
		   I guess this is what you have in mind. That'll work fine!

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Sep 30, 2009 5:55 am Post subject: tie down alternative

Be careful putting an aluminium ring in contact with the 4130 chomoly .  If you go that route be sure to use a good insulator so you won’t cause dissimilar metal corrosion at that point.  

   

Noel  

       

From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Dave G

 Sent: Tuesday, September 29, 2009 1:24 PM

 To: kitfox-list(at)matronics.com

 Subject: tie down alternative  

  

  

     

The small loop on the front strut attach point for one of my wings has been broken off. I do not wish to attempt to replace or repair it, I would like to make a small strap affair of fairly thick/strong aluminum and place it under the bolt, using a longer bolt as required.. Advice?   

    

   

    

   

    

   

    

Dave Goddard

 KF IV 1050 / 582 / Warp  

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Wed Sep 30, 2009 7:28 am Post subject: tie down alternative

I just had another look at my hold-down strap installation, and I  

bolted mine onto the lift strut attach point, using the small loop as  

the "hole" and ran a bolt through it with a large washer on each  

side. This lets the edge of the tang sit in line with the airstream.  

Using the strut attach bolt will make the tang lay flat against the  

airstream, like your picture. Now I realize you have lost your loop,  

so you can't do the "streamlined" approach (unless you want to try to  

twist the tang 90 degrees), but I had another thought....and this one  

might raise some eyebrows among the engineers among us.



If you were to back off the jam nut on the rod end bearing that is on  

the end of the strut, lay the edge of the tang against the strut  

threads, run the jam nut back up against the tang....using the tang  

as a feeler gauge to set the distance that the jam nut will be  

relocated to....then temporarily loctite the jam nut in this  

position. Then remove the front strut rod end bearing, taking count  

of the number of revolutions that it is screwed onto the strut, and  

noting the forward-facing side of the bearing, so as to make sure it  

gets returned to the exact same location. Then slide the tang onto  

the strut threads, and against the jam nut. Then screw the bearing  

back onto the strut, locating it in the exact same place, distance- 

wise, that it was removed from, and it should be snug against the  

tang which will be snug against the jam nut. If it is not, loosen the  

jam nut and make sure that the rod end bearing IS in exactly its  

original position, then tighten the jam nut against the tang and the  

rod end bearing.



This method doesn't sit too well with me, as I can imagine that it  

might cause wear on the threads of the strut, in which case you'd be  

better off trying to weld the original loop back into position than  

trying to replace the strut end threads. I only mention this method  

so as to wake up some engineers, and let them shoot me down....at  

least it'll cause some debate. : )



Another thought.....how about using the wing hold-back tab that is  

welded to the rear strut attach bracket to attach the tie down rope?



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 782.2 hrs

Countdown to 1000 hrs~218 to go

Sensenich 62"x46" Wood prop

Electroair direct-fire ignition system

Rotec TBI-40 injection

Status: flying

do not archive



On Sep 30, 2009, at 6:16 AM, Dave G wrote:



[quote] I guess this is what you have in mind. That'll work fine!

 ---

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

occom

Joined: 26 Aug 2006
Posts: 404

Posted: Wed Sep 30, 2009 9:43 am Post subject: tie down alternative

I don't think I would use the strut attachment to the rod end. I don't 

particularly like that arrangement anyway, but there's no point arguing 

against success, it works. I think I'll just put a tang under the bolt and 

let it intercept as much air as it wants to, the kitfox is a fairly draggy 

design anyway so it unlikely to make a measurable difference. The tang I'll 

order is 1.25" long, not large. I looked at the wing hold back but I've 

never seen an aircraft tied there.

---

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Wed Sep 30, 2009 10:41 am Post subject: tie down alternative

Me neither, but I don't see why it wouldn't work. The only drawback I  

can see is it's further back, and you would lose the mechanical  

advantage of having the tie downs as far apart as is practical.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 782.6 hrs

Countdown to 1000 hrs~218 to go

Sensenich 62"x46" Wood prop

Electroair direct-fire ignition system

Rotec TBI-40 injection

Status: flying

do not archive



On Sep 30, 2009, at 1:40 PM, Dave G wrote:



 	  Quote: 	
		   


	


 	  Quote: 	
		    I looked at the wing hold back but I've never seen an aircraft  

 tied there.

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Thu Oct 01, 2009 7:53 am Post subject: tie down alternative

At 08:25 AM 9/30/2009, you wrote:

  	  Quote: 	
		  and this one  

 might raise some eyebrows among the engineers among us. 	


 It gave me the willies. You NEVER want to load any of the threaded rods of a push/pull system in bending. (Lift struts, control rods, etc.) Even the slightest misalignment will dramatically reduce its compression capability, not to mention the reduction in fatigue life.



 

 Guy Buchanan

 16718 Peace Valley Lane

 Ramona, CA  92065-7046

 USA

 1-760-789-4482

 1-760-809-6145: Cell

 bnn(at)nethere.com    [quote][b]

_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

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