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Model II MTOW - Strut sizes

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Tue Nov 28, 2006 10:32 am Post subject: Model II MTOW - Strut sizes

Noel,   

  

 For referance my  IV struts are 1.00  "    -- no idea on the thickness.   I would be  concerned about the carry through diameter and thickness as well.  On  Floats the carry through tube supports the rear float support legs just behind  the step as well as the wing loads from the struts.  

  

 I would call John McBean for his insights.  

  

  

 Dave 

  

  

 [quote]   ---

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Float Flyr

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

Posted: Tue Nov 28, 2006 12:25 pm Post subject: Model II MTOW - Strut sizes

The stresses on the struts are  tensional and I'm sure they are way over 2000lb tensional strength. ( 100% over  stress for the weight of the plane )  What is the diameter or you carry  through tube?  My rear support legs are attached to the lower chines next  to the carry through tube.  I haven't looked inside yet but I wouldn't be  surprised to find a couple of cluster welds there to distribute the stress of  the rear float legs.

  

  

 

Noel [quote]   

   --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Rex Hefferan

Joined: 10 Jan 2006
Posts: 147
Location: Olney Springs, Colorado USA "NOT a Kitpig"

Posted: Wed Nov 29, 2006 8:58 am Post subject: Model II MTOW - Strut sizes

Somewhere in one of the old kitfox newsletters, from Denny Aircraft I 

believe, is a article with a picture of a kitfox wing mounted upside 

down to a test rig and a great many sand bags placed on the wing for a 

static load test. I think the wing structure supported the equivalent of 

over 15G's before failure. Not sure how we should relate the test to 

this whole subject.

 I'm away from home and the article or I would offer to upload a copy. 

Maybe someone else has it?



Rex Hefferan

Colorado

Noel Loveys wrote:



[quote] The stresses on the struts are tensional and I'm sure they are way 

 over 2000lb tensional strength. ( 100% over stress for the weight of 

 the plane )  What is the diameter or you carry through tube?  My rear 

 support legs are attached to the lower chines next to the carry 

 through tube.  I haven't looked inside yet but I wouldn't be surprised 

 to find a couple of cluster welds there to distribute the stress of 

 the rear float legs.

  

  



 Noel



     --

_________________
Rex
N740GP - M2/582
Colorado

dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Wed Nov 29, 2006 10:13 am Post subject: Model II MTOW - Strut sizes

Where did it fail ?

The carry throguh tube would be one of the weakest links.

Rod ends would be the next weakest link I think.  If you look at the Avids 

they do not use rod ends.

Dave



---

Rex Hefferan

Joined: 10 Jan 2006
Posts: 147
Location: Olney Springs, Colorado USA "NOT a Kitpig"

Posted: Wed Nov 29, 2006 1:29 pm Post subject: Model II MTOW - Strut sizes

I'm afraid I don't remember the details. I suspect it was an attach 

point possibly the rod ends. I'll try to post the article when I can get 

back and locate it.



Rex

Colorado



dave wrote:



[quote] 



 Where did it fail ?

 The carry throguh tube would be one of the weakest links.

 Rod ends would be the next weakest link I think.  If you look at the 

 Avids they do not use rod ends.

 Dave



 ---

_________________
Rex
N740GP - M2/582
Colorado

Lynn Matteson

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

Posted: Wed Nov 29, 2006 2:24 pm Post subject: Model II MTOW - Strut sizes

I saw that test setup in one of the videos that Skystar produced...I 

seem to recall them loading the sandbags during the video.

Lynn

On Wednesday, November 29, 2006, at 11:57  AM, GypsyBeeInnkeepers wrote:

[quote] 

 <hefferans(at)gmail.com>

 Somewhere in one of the old kitfox newsletters, from Denny Aircraft I 

 believe, is a article with a picture of a kitfox wing mounted upside 

 down to a test rig and a great many sand bags placed on the wing for a 

 static load test. I think the wing structure supported the equivalent 

 of over 15G's before failure. Not sure how we should relate the test 

 to this whole subject.

 I'm away from home and the article or I would offer to upload a copy. 

 Maybe someone else has it?

 Rex Hefferan

 Colorado

 Noel Loveys wrote:

> The stresses on the struts are tensional and I'm sure they are way 

> over 2000lb tensional strength. ( 100% over stress for the weight of 

> the plane )  What is the diameter or you carry through tube?  My rear 

> support legs are attached to the lower chines next to the carry 

> through tube.  I haven't looked inside yet but I wouldn't be 

> surprised to find a couple of cluster welds there to distribute the 

> stress of the rear float legs.

>

> Noel

>

>     --

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

skyflyte(at)comcast.net
Guest

Posted: Wed Nov 29, 2006 2:25 pm Post subject: Model II MTOW - Strut sizes

I think the issue at the time was the welded spar/lift strut attach fitting and they wanted to show that that was not the weak link in the airframe (as was claimed by the Avid owners at the time).  I have the article somewhere too, and if I find it I will scan it and send it out.

    Mike

    490MC

 [quote]-------------- Original message -------------- 

From: GypsyBeeInnkeepers <hefferans(at)gmail.com> 

[quote] --> Kitfox-List message posted by: GypsyBeeInnkeepers 

 I'm afraid I don't remember the details. I suspect it was an attach 

 point possibly the rod ends. I'll try to post the article when I can get 

 back and locate it. 

 Rex 

 Colorado 

 dave wrote: 

 > --> Kitfox-List message posted by: "dave" 

 > 

 > Where did it fail ? 

 > The carry throguh tube would be one of the weakest links. 

 > Rod ends would be the next weakest link I think. If you look at the 

 > Avids they do not use rod ends. 

 > 

 > 

 > Dave 

 > 

 > 

 > 

 > >  > 

 > ---

roncarolnikko(at)hotmail.
Guest

Posted: Wed Nov 29, 2006 9:42 pm Post subject: Model II MTOW - Strut sizes

Rex I have that picture somewhere in My Avid builders manual.  Never saw it 

in all of my Kitfox materials.   Perhaps there is one, but not in my 92' 

speedster manual.  Last time I scanned and posted I overdosed the Avid photo 

section.   Not very good at downsizing so if  someone else finds one 

first.....   Ron NB Ore

[quote]From: GypsyBeeInnkeepers <hefferans(at)gmail.com>

Reply-To: kitfox-list(at)matronics.com

To: kitfox-list(at)matronics.com

Subject: Re: Model II MTOW - Strut sizes

Date: Wed, 29 Nov 2006 09:57:54 -0700

Somewhere in one of the old kitfox newsletters, from Denny Aircraft I 

believe, is a article with a picture of a kitfox wing mounted upside down 

to a test rig and a great many sand bags placed on the wing for a static 

load test. I think the wing structure supported the equivalent of over 

15G's before failure. Not sure how we should relate the test to this whole 

subject.

I'm away from home and the article or I would offer to upload a copy. Maybe 

someone else has it?

Rex Hefferan

Colorado

Noel Loveys wrote:

>The stresses on the struts are tensional and I'm sure they are way over 

>2000lb tensional strength. ( 100% over stress for the weight of the plane 

>)  What is the diameter or you carry through tube?  My rear support legs 

>are attached to the lower chines next to the carry through tube.  I 

>haven't looked inside yet but I wouldn't be surprised to find a couple of 

>cluster welds there to distribute the stress of the rear float legs.

>Noel

>

>     --

lcfitt(at)sbcglobal.net
Guest

Posted: Thu Nov 30, 2006 7:15 am Post subject: Model II MTOW - Strut sizes

In the sales brochure from the period  I ordered my kit (1992) there is the 

picture mentioned, but I have never seen a discussion describing the test 

and the failure mode, except on the list.  It shows a fuselage with wings, 

upside-down with bags of something  that created bowing on both spars 

inboard of the strut and sagging outboard.  There is also a picture of the 

horizontal Stabilizer, this time right side up with similar weights on it.



Lowell

---

dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Thu Nov 30, 2006 7:35 am Post subject: Model II MTOW - Strut sizes

Lowell,



I am sure you have seen this site 

http://www.aircraftdesigns.com/experience.html  but they meniton the Kitfox 

there and should some sandbag loaded wings on that page.  Don't think a 

Kitfox in those pics

Dave

---

jdmcbean(at)cableone.net
Guest

Posted: Sun Dec 03, 2006 11:30 am Post subject: Model II MTOW - Strut sizes

Here are some pics of some of the current model testing that was done for

the IV as well. http://www.kitfoxaircraft.com/testing information.htm



Fly Safe !!

John & Debra McBean

208.337.5111

www.kitfoxaircraft.com

"It's not how Fast... It's how Fun!"



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