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crankpot
Joined: 20 Oct 2014
Posts: 16
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 Posted: Sat Oct 25, 2014 1:22 pm Post subject: ultrastar cuyuna prop shaft breakage |
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A long time ago these shafts were plagued with breakage. Supposedly there was a fix. Anyone have knowledge of this issue?
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1984 kolb ultrstar
Former 1997 kolb firestat |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sat Oct 25, 2014 6:54 pm Post subject: ultrastar cuyuna prop shaft breakage |
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Never knew there was a problem with Homer Kolb's redrive and
prop shaft, much less a fix.
The prop shaft was pretty husky for a 35 hp engine and a 50
inch wooden prop.
john h
mkIII
Titus, Alabama
A long time ago these shafts were plagued with breakage.
Supposedly there was a fix. Anyone have knowledge of this
issue?
--------
1984 kolb ultrstar
Former 1997 kolb firestat
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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crankpot
Joined: 20 Oct 2014
Posts: 16
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| Posted: Sat Oct 25, 2014 7:15 pm Post subject: Re: ultrastar cuyuna prop shaft breakage |
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I agree but....
In my ultra stars documents is a hand written letter by homer himself talking about the prop shaft failures. He stated there was a fix and most we're upgraded but I'm looking for some details here to decide whether I need to address mine. It sure looks beefy tho...
A shaft failure of a pusher would be bad indeed.
He also states that eventually the cuyuna cranks will break from belt tension. Looking for some info on this as well.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kolb-List |
|
_________________
1984 kolb ultrstar
Former 1997 kolb firestat |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sat Oct 25, 2014 7:27 pm Post subject: ultrastar cuyuna prop shaft breakage |
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Do you know when the US kit was purchased? I bought mine
Feb 1984, one of the first US kits to be shipped with
factory welded fuselage and components. Earlier versions
were shipped as material kits with builder required welding.
Don't know when the ULII02 replaced the 430, but may have
been a factor in possible crank shaft failures.
john h
mkIII
Titus, Alabama
<bobg379(at)yahoo.com>
I agree but....
In my ultra stars documents is a hand written letter by
homer himself talking about the prop shaft failures. He
stated there was a fix and most we're upgraded but I'm
looking for some details here to decide whether I need to
address mine. It sure looks beefy tho...
A shaft failure of a pusher would be bad indeed.
He also states that eventually the cuyuna cranks will break
from belt tension. Looking for some info on this as well.
--------
1984 kolb ultrstar
Former 1997 kolb firestat
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kolb-List |
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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crankpot
Joined: 20 Oct 2014
Posts: 16
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| Posted: Sun Oct 26, 2014 3:21 pm Post subject: Re: ultrastar cuyuna prop shaft breakage |
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John, I'll check on the date but it was a materials kit.
I was wondering what happened to you when the leading edge failed causing you to parachute to safety? Something I need to be worried about?
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
1984 kolb ultrstar
Former 1997 kolb firestat |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sun Oct 26, 2014 9:21 pm Post subject: ultrastar cuyuna prop shaft breakage |
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On the Ultrastar it was the upper aileron bell crank that
failed. Was a factory welded kit and there was no brace on
it, as depicted in the plans. Homer Kolb decided since the
kit was TIG welded it would be stronger and not need the
brace. I proved him wrong.
john h
mkIII
Sevierville, Tennessee
<bobg379(at)yahoo.com>
John, I'll check on the date but it was a materials kit.
I was wondering what happened to you when the leading edge
failed causing you to parachute to safety? Something I need
to be worried about?
--------
1984 kolb ultrstar
Former 1997 kolb firestat
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=432324#432324
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Photoshare, and much much more:
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Mon Oct 27, 2014 10:30 am Post subject: ultrastar cuyuna prop shaft breakage |
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The Ultrastar and Cuyuna weren't the only aircraft to suffer from prop shaft breakage. The Kasperwing had problems with the 250 Honda ATV engine they started out with and again with the Zenoah G25. It was neither engine nor airframe, but a failure to understand the stresses put on the shaft by resonance of the prop as it rotated. In the Kasperwing's case, the original shaft was annealed 1" diameter 4130 tube with a .188" wall thickness. Then a 5/8" grade 8 bolt was put through the center. When the tube still cracked it was ditched for solid bar stock and no cracks were reported but that may have been because the company died and the aircraft were either destroyed in crashes or simply retired to garages and never emerged. Rotax uses hollow prop shafts in their gearboxes but they are hardened and the bearing surfaces are ground to fit the carrier bearings. The material is stronger and there's no slop for the propeller oscillations to begin working up cracks.
Rick Girard
do not archive
On Sat, Oct 25, 2014 at 10:27 PM, John Hauck <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)> wrote:
| Quote: | --> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)>
Do you know when the US kit was purchased? I bought mine
Feb 1984, one of the first US kits to be shipped with
factory welded fuselage and components. Earlier versions
were shipped as material kits with builder required welding.
Don't know when the ULII02 replaced the 430, but may have
been a factor in possible crank shaft failures.
john h
mkIII
Titus, Alabama
--> Kolb-List message posted by: "crankpot"
<bobg379(at)yahoo.com (bobg379(at)yahoo.com)>
I agree but....
In my ultra stars documents is a hand written letter by
homer himself talking about the prop shaft failures. He
stated there was a fix and most we're upgraded but I'm
looking for some details here to decide whether I need to
address mine. It sure looks beefy tho...
A shaft failure of a pusher would be bad indeed.
He also states that eventually the cuyuna cranks will break
from belt tension. Looking for some info on this as well.
--------
1984 kolb ultrstar
Former 1997 kolb firestat
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crankpot
Joined: 20 Oct 2014
Posts: 16
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| Posted: Fri Nov 07, 2014 5:21 am Post subject: Re: ultrastar cuyuna prop shaft breakage |
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Found the answer. The issue was the redrive mounting plate. It had holes drilled in it too close to the edges and suffered from cracking. Most were replaced.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
1984 kolb ultrstar
Former 1997 kolb firestat |
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