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Lift Strut / Stress question

 
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planecrazzzy
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PostPosted: Sat Mar 04, 2006 8:17 pm    Post subject: Lift Strut / Stress question Reply with quote

Hey Guys,
I've seen my"stock" Lift struts "wiggle/shake" in flight.....I'll be changing over to the streamline struts....

I'm sure they'll still flex alittle....

I've heard on the list that the chromemoly on the end of the lift struts have cracked on a couple of different planes....
Here's a picture of two holes in a lift strut....I'm looking for YOUR opinion if this looks like trouble waiting to strike....or are these streamline struts
"bullet proof" where these hole won't crack with repeated flexing....

Gotta Fly...
Mike in MN N381PM ( still improving it )


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Pitot tube holes in lift strut.2.bmp
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Pitot tube holes in lift strut.2.bmp


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Kirk Smith



Joined: 10 Jan 2006
Posts: 78
Location: SE Michigan

PostPosted: Sat Mar 04, 2006 9:56 pm    Post subject: Lift Strut / Stress question Reply with quote

" Here's a picture of two holes in a lift strut....I'm looking for YOUR
opinion if this looks like trouble waiting to strike"

YIKES!!!!!! Maybe it doesn't have the moly inserts at the end but has a
full length moly tube inside the streamline strut?

Do not archive


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planecrazzzy
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PostPosted: Sun Mar 05, 2006 4:43 am    Post subject: Re: Lift Strut / Stress question Reply with quote

You've got a GOOD POINT....I wrote John and asked him if a Chromemoly tube is running the Full Lenght....If that Streamline is just a
"Sleeve" then those holes wouldn't be a problem....

If not, Then what "you" said...YIKES !!!

Gotta Fly...
Mike in MN


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Richard Pike



Joined: 09 Jan 2006
Posts: 1670
Location: Blountville, Tennessee

PostPosted: Sun Mar 05, 2006 4:43 am    Post subject: Lift Strut / Stress question Reply with quote

Those holes would be real close to the top of my "Bad idea" list.

Richard Pike
MKIII N420P (420ldPoops)

do not archive
planecrazzzy wrote:
Quote:


Hey Guys,
I've seen my"stock" Lift struts "wiggle/shake" in flight.....I'll be changing over to the streamline struts....

I'm sure they'll still flex alittle....

I've heard on the list that the chromemoly on the end of the lift struts have cracked on a couple of different planes....
Here's a picture of two holes in a lift strut....I'm looking for YOUR opinion if this looks like trouble waiting to strike....or are these streamline struts
"bullet proof" where these hole won't crack with repeated flexing....

Gotta Fly...
Mike in MN N381PM ( still improving it )

--------
The more people I know....
The more I like MY DOG
.
.
.
.
.Do not archive


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http://forums.matronics.com/viewtopic.php?p=19614#19614


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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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jdm(at)wideworld.net
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PostPosted: Sun Mar 05, 2006 7:29 am    Post subject: Lift Strut / Stress question Reply with quote

I'll check next time I go to the airport, but I believe it is a sleeve.

---


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planecrazzzy
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PostPosted: Sun Mar 05, 2006 8:01 am    Post subject: Sleeves Reply with quote

Hey Guys,
I thought "sleeves" only came in plastic....?

If they make them in Aluminum...would they be easy to "slip over" my stock Lift Struts.....?

I wouldn't want plastic sleeves , So ,I thought I would have to buy new Chromemoly inserts and remake my Streamline Aluminum Lift Struts....
Gotta Fly...
Mike in MN


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JetPilot



Joined: 10 Jan 2006
Posts: 1246

PostPosted: Sun Mar 05, 2006 9:06 am    Post subject: Re: Lift Strut / Stress question Reply with quote

Are there problems with the chromemoly struts ?? This is a question that I asked Kolb when I bought my MK III and they said the chromemoly round struts were stronger and more tolerant of negative G's than the streamlined struts.

What have you guys experienced, do the round struts stake themselves to death over time ? Are the streamlined struts better in the long run ?

Michael A. Bigelow


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"NO FEAR" - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S
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herbgh



Joined: 10 Jan 2006
Posts: 145

PostPosted: Sun Mar 05, 2006 9:42 am    Post subject: Lift Strut / Stress question Reply with quote

Guys
Haven't we discovered , over the years, that normally operated Kolbs
have never had a structural failure? Smile Herb ---MkIII,Ultrastar and
Firefly owner.. not at the same time!! Smile
On Sun, 5 Mar 2006 09:06:27 -0800 "JetPilot" <orcabonita(at)hotmail.com>
writes:
Quote:


Are there problems with the chromemoly struts ?? This is a
question that I asked Kolb when I bought my MK III and they said the
chromemoly round struts were stronger and more tolerant of negative
G's than the streamlined struts.

What have you guys experienced, do the round struts stake themselves
to death over time ? Are the streamlined struts better in the long
run ?

Michael A. Bigelow

--------
NO FEAR - If you have no fear you did not go as fast as you could
have !!!




Read this topic online here:

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planecrazzzy
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PostPosted: Sun Mar 05, 2006 9:49 am    Post subject: Re: Lift Strut / Stress question Reply with quote

Hi JP,
I don't know about Chromemoly Lift struts.....Mine are Stock Lift Struts.....Aluminum tube-inside an Aluminum tube....Then Chromemoly bolted on each end..... "MINE" wiggled and shook from time to time ,while I was flying.....I don't like that, so I'll be switching over to the Aluminum Streamline Lift Struts with the Chromemoly inserts like I already have...

And that is why I was questioning the holes in the lift strut in that picture.
"I" think the Streamline Struts are STRONGER....But, their still going to go thru SOME flexing ...

The problem with the Chromemoly on the Lift Struts that "I've" heard on THIS list.....Is, Some of them have been found with Cracks.....Didn't one guy "go down" because the lower chromemoly piece had weakened because of WATER , and then Failed in Flight....


I've Sheared tubing for lattus on Crane Booms ....Sometimes when the metal had a little more tensil strength the end of the tube would "split" when Sheared.....If this happened it would get repaired....but the rest of the Stock would still have the potential to do the same thing.....We don't know if Kolb is "seeing" any of this when they go thru the process....
When I've heard of cracks in the material, Thats where "I" think they were from....It just took alot of FLEXING to bring it out...

Gotta Fly...
Mike in MN
JetPilot wrote:
Are there problems with the chromemoly struts ?? This is a question that I asked Kolb when I bought my MK III and they said the chromemoly round struts were stronger and more tolerant of negative G's than the streamlined struts.

What have you guys experienced, do the round struts shake themselves to death over time ? Are the streamlined struts better in the long run ?

Michael A. Bigelow


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planecrazzzy
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PostPosted: Sun Mar 05, 2006 10:02 am    Post subject: Re: Lift Strut / Stress question Reply with quote

Bliss,
Operated , Stock , Modified.....NEVER? Are you Asking or Telling...

Gotta Fly...
herbgh wrote:
Guys
Haven't we discovered , over the years, that normally operated Kolbs
have never had a structural failure? Herb
Quote:







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ElleryWeld(at)aol.com
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PostPosted: Sun Mar 05, 2006 6:59 pm    Post subject: Lift Strut / Stress question Reply with quote

I have swiched to the streamline struts on my firestar because all that
movement, vibration in the old round ones made me nervous and the streamline
struts dont move at all and there less drag
only my opinion take it for what you paid for it

Ellery in Maine Original Firestar changed a bit Surprised)

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JetPilot



Joined: 10 Jan 2006
Posts: 1246

PostPosted: Sun Mar 05, 2006 7:17 pm    Post subject: Re: Lift Strut / Stress question Reply with quote

Thanks Mike,

The lift struts is something I have not really put much thought into. I was going to put a Jury Strut on my MK-III like John Hauck did, but when I talked to Kolb they told me that the new struts were quite a big stronger and that it would not be needed. I did not do any further research on this topic since then...

I will have one of the faster MK-III's built, with the 912-S, the very efficient Kiev Hot prop, and wheel pants it should be pushing the airspeed limits. Has anyone ever seen these vibrations in the round lift struts in a MK-III Xtra at high speeds ???

Michael A. Bigelow


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PostPosted: Mon Mar 06, 2006 6:43 am    Post subject: Lift Strut / Stress question Reply with quote

I will have one of the faster MK-III's built, with the 912-S, the very
efficient Kiev Hot prop, and wheel pants it

Hi Mike,
what would that speed be in the US? Here, with a Jabiru the Xtra is
placarded at 95 pmh.

Pat

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