Today's Message Index:
----------------------
1. 07:11 AM - Re: prop drive belt failure (Michel Therrien)
2. 07:44 AM - Re: prop drive belt failure (Hinde, Frank George (Corvallis))
3. 09:36 AM - Re: Stratus belt failure (gary)
4. 10:21 AM - Re: Stratus belt failure (Don Walker)
5. 10:30 AM - Re: Stratus belt failure (Hinde, Frank George (Corvallis))
6. 04:11 PM - Re: Stratus belt failure (Jim and Lucy)
7. 04:20 PM - Re: Stratus belt failure (Hinde, Frank George (Corvallis))
8. 08:26 PM - Re: Stratus belt failure (gary)
Message 1
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| Subject: | Re: prop drive belt failure |
--> Stratus-List message posted by: Michel Therrien <mtherr@yahoo.com>
I read an article recently about a Challenger
ultralight crash due to a failed belt. The article
explains that belt tension is critical. On this
aircraft, there was not enough tension. Details are
given on how to adjust tension.
Look for belt redrive failure Challenger on google.
Michel
PS: From Airventure :-)
--- John Karnes <jpkarnes2000@msn.com> wrote:
> --> Stratus-List message posted by: "John Karnes"
> <jpkarnes2000@msn.com>
>
> On power up yesterday, I experienced a belt failure.
> Luckily, I still was on the ground. The belt had
> about 80 hours on it but dated back to when Stratus
> changed from two belts to one (about three to fours
> ago?). Upon examination, the "teeth" on the inside
> of the belt separated from the rest of the belt,
> thus causing the belt to lose grip of the pulley and
> resulted in a failure. When I called Mykal, he said
> that "materials degrade over time and the belt
> should be changed out every year". This, of course,
> is contrary to his published maintenance schedule
> for this item. Given the critical nature of this
> part and my recent experience, I would have to agree
> and recommend a yearly change out of the belt. I
> can't imagine the end result of a belt failure over
> hostile terrain...=0D=0A=0D=0AJohn
> Karnes=0D=0AN601JK Zenith 601HDS=0D=0AWashington
>
>
>
> browse
> Subscriptions page,
> FAQ,
>
>
>
>
>
>
----------------------------
Michel Therrien CH601-HD, C-GZGQ
http://mthobby.pcperfect.com/ch601
http://www.zenithair.com/bldrlist/profiles/mthobby
http://pages.infinit.net/mthobby
Message 2
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| Subject: | prop drive belt failure |
--> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
Yeah I was thinking about this and wondered the same thing. Belt drive
failure so far (ha!) has been extremly rare. I wondered if the tooth
failure in another post was a result of the belt chattering on the
sprockets.
So far my belt/teeth look in perfect condition and I changed the first
one at about 3 years and 300 hours. The belt looked perfect.
Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of Michel
Therrien
Subject: Re: Stratus-List: prop drive belt failure
--> Stratus-List message posted by: Michel Therrien <mtherr@yahoo.com>
I read an article recently about a Challenger ultralight crash due to a
failed belt. The article explains that belt tension is critical. On
this aircraft, there was not enough tension. Details are given on how
to adjust tension.
Look for belt redrive failure Challenger on google.
Michel
PS: From Airventure :-)
--- John Karnes <jpkarnes2000@msn.com> wrote:
> --> Stratus-List message posted by: "John Karnes"
> <jpkarnes2000@msn.com>
>
> On power up yesterday, I experienced a belt failure.
> Luckily, I still was on the ground. The belt had about 80 hours on
> it but dated back to when Stratus changed from two belts to one (about
> three to fours ago?). Upon examination, the "teeth" on the inside of
> the belt separated from the rest of the belt, thus causing the belt to
> lose grip of the pulley and resulted in a failure. When I called
> Mykal, he said that "materials degrade over time and the belt should
> be changed out every year". This, of course, is contrary to his
> published maintenance schedule for this item. Given the critical
> nature of this part and my recent experience, I would have to agree
> and recommend a yearly change out of the belt. I can't imagine the
> end result of a belt failure over hostile terrain...=0D=0A=0D=0AJohn
> Karnes=0D=0AN601JK Zenith 601HDS=0D=0AWashington
>
>
>
> browse
> Subscriptions page,
> FAQ,
>
>
>
>
>
>
----------------------------
Michel Therrien CH601-HD, C-GZGQ
http://mthobby.pcperfect.com/ch601
http://www.zenithair.com/bldrlist/profiles/mthobby
http://pages.infinit.net/mthobby
Message 3
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| Subject: | Re: Stratus belt failure |
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
Thanks for posting that Dale. I think I'll be checking my pulley condition
when I get back, if I don't see any wear then it's worth the peace of mind.
A belt replacement might not be necessary every 100 hours but I'm gonna put
belt removal and inspection on my annual.
How did you adjust your belt? I use the 1/4" play at the prop tip when cold
method. That seems to be about right, when it warms up the play goes away.
I think it's a pain to adjust and keep the pulleys in parallel and get just
the right tension, but when it's setup it usually stays that way. Just a
little tighter or looser seems to make a big difference in sound and
vibration.
I was always afraid of making it too tight and cooking the bearings. I'd
like to put a thermocouple on the drive near the bearing. I figure if I
baseline the temps, maybe I'll see an increase if/when the bearing starts to
go. Does this sound worthwhile to anyone?
Gary Krysztopik
Pelican PL - N522GK
Stratus Subaru EA-81
Newport, RI
http://members.efortress.com/flyink/index.html
----- Original Message -----
From: <clark.dale@att.net>
Subject: Stratus-List: Stratus belt failure
> --> Stratus-List message posted by: clark.dale@att.net
>
> I recently had the belt break on my Stratus EA81. I happened about 30
> seconds after lift off. I was able to dead stick the plane , an Avid
> flyer on floats, back on the lake. The belt and redrive both have about
> 200 hours on them and the belt was about three years old. The prop pulley
> showed wear on the top of the teeth, the anodizing was worn off the teeth
> on all the teeth on the prop pulley. The crank pulley also had some of
> the anodizing missing on some of the teeth, but just small chips missing.
> I talked to Mykal at stratus and he couldn't shed any light on what may
> have happened. I suspect that maybe the tension was to tight on the belt
> and or the tracking wasn't within tolerance. I am looking for a complete
> stratus redrive if anyone has one for sale or knows of one I am interested
> in buying.
> Dale 907 225 4930
>
> <!-- BEGIN WEBMAIL STATIONERY -->
>
>
> <!-- WEBMAIL STATIONERY noneset -->
> I recently had the belt break on my Stratus EA81. I happened about 30
> seconds after lift off. I was able to dead stick the plane , an Avid flyer
> on floats, back on the lake. The belt and redrive both have about 200
> hours on them and the belt was about three years old. The prop pulley
> showed wear on the top of the teeth, the anodizing was worn off the teeth
> on all the teeth on the prop pulley. The crank pulley also had some of the
> anodizing missing on some of the teeth, but just small chips missing. I
> talked to Mykal at stratus and he couldn't shed any light on what may have
> happened. I suspect that maybe the tension was to tight on the belt and or
> the tracking wasn't within tolerance. I am looking for a complete stratus
> redrive if anyone has one for sale or knows of one I am interested in
> buying.
> Dale 907 225 4930
> <!-- END WEBMAIL STATIONERY -->
>
>
>
Message 4
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| Subject: | Re: Stratus belt failure |
--> Stratus-List message posted by: "Don Walker" <d3dw@msn.com>
Gary, it might be as simple as touching your bearings occasionally after flying...just
getting used to what is normal. Mine are okay to touch...not hot...just
warm. I think you could feel if they start heating up. then check them out further.
don
----- Original Message -----
From: gary<mailto:FlyinK@efortress.com>
To: stratus-list@matronics.com<mailto:stratus-list@matronics.com>
Sent: Thursday, July 28, 2005 11:36 AM
Subject: Re: Stratus-List: Stratus belt failure
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com<mailto:FlyinK@Efortress.com>>
Thanks for posting that Dale. I think I'll be checking my pulley condition
when I get back, if I don't see any wear then it's worth the peace of mind.
A belt replacement might not be necessary every 100 hours but I'm gonna put
belt removal and inspection on my annual.
How did you adjust your belt? I use the 1/4" play at the prop tip when cold
method. That seems to be about right, when it warms up the play goes away.
I think it's a pain to adjust and keep the pulleys in parallel and get just
the right tension, but when it's setup it usually stays that way. Just a
little tighter or looser seems to make a big difference in sound and
vibration.
I was always afraid of making it too tight and cooking the bearings. I'd
like to put a thermocouple on the drive near the bearing. I figure if I
baseline the temps, maybe I'll see an increase if/when the bearing starts to
go. Does this sound worthwhile to anyone?
Gary Krysztopik
Pelican PL - N522GK
Stratus Subaru EA-81
Newport, RI
http://members.efortress.com/flyink/index.html<http://members.efortress.com/flyink/index.html>
----- Original Message -----
From: <clark.dale@att.net<mailto:clark.dale@att.net>>
To: <stratus-list@matronics.com<mailto:stratus-list@matronics.com>>
Subject: Stratus-List: Stratus belt failure
> --> Stratus-List message posted by: clark.dale@att.net<mailto:clark.dale@att.net>
>
> I recently had the belt break on my Stratus EA81. I happened about 30
> seconds after lift off. I was able to dead stick the plane , an Avid
> flyer on floats, back on the lake. The belt and redrive both have about
> 200 hours on them and the belt was about three years old. The prop pulley
> showed wear on the top of the teeth, the anodizing was worn off the teeth
> on all the teeth on the prop pulley. The crank pulley also had some of
> the anodizing missing on some of the teeth, but just small chips missing.
> I talked to Mykal at stratus and he couldn't shed any light on what may
> have happened. I suspect that maybe the tension was to tight on the belt
> and or the tracking wasn't within tolerance. I am looking for a complete
> stratus redrive if anyone has one for sale or knows of one I am interested
> in buying.
> Dale 907 225 4930
>
> <!-- BEGIN WEBMAIL STATIONERY -->
>
>
> <!-- WEBMAIL STATIONERY noneset -->
> I recently had the belt break on my Stratus EA81. I happened about 30
> seconds after lift off. I was able to dead stick the plane , an Avid flyer
> on floats, back on the lake. The belt and redrive both have about 200
> hours on them and the belt was about three years old. The prop pulley
> showed wear on the top of the teeth, the anodizing was worn off the teeth
> on all the teeth on the prop pulley. The crank pulley also had some of the
> anodizing missing on some of the teeth, but just small chips missing. I
> talked to Mykal at stratus and he couldn't shed any light on what may have
> happened. I suspect that maybe the tension was to tight on the belt and or
> the tracking wasn't within tolerance. I am looking for a complete stratus
> redrive if anyone has one for sale or knows of one I am interested in
> buying.
> Dale 907 225 4930
> <!-- END WEBMAIL STATIONERY -->
>
>
>
Message 5
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| Subject: | Stratus belt failure |
--> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
I don't know if thermocoupling your bearings will give you good data or
not. Its probably a case of try it and see. My guess would be the
cooling effect in flight will be highly ambient temperature dependant
which may well mask any useful data.
I think we now have three documented belt failures between this and the
Zenith list...Is that correct?...I hope this is not going the same way
as the valve guides!
Nervous Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of Don Walker
Subject: Re: Stratus-List: Stratus belt failure
--> Stratus-List message posted by: "Don Walker" <d3dw@msn.com>
Gary, it might be as simple as touching your bearings occasionally after
flying...just getting used to what is normal. Mine are okay to
touch...not hot...just warm. I think you could feel if they start
heating up. then check them out further. don
----- Original Message -----
From: gary<mailto:FlyinK@efortress.com>
To: stratus-list@matronics.com<mailto:stratus-list@matronics.com>
Sent: Thursday, July 28, 2005 11:36 AM
Subject: Re: Stratus-List: Stratus belt failure
--> Stratus-List message posted by: "gary"
<FlyinK@Efortress.com<mailto:FlyinK@Efortress.com>>
Thanks for posting that Dale. I think I'll be checking my pulley
condition
when I get back, if I don't see any wear then it's worth the peace of
mind.
A belt replacement might not be necessary every 100 hours but I'm
gonna put
belt removal and inspection on my annual.
How did you adjust your belt? I use the 1/4" play at the prop tip
when cold
method. That seems to be about right, when it warms up the play goes
away.
I think it's a pain to adjust and keep the pulleys in parallel and get
just
the right tension, but when it's setup it usually stays that way.
Just a
little tighter or looser seems to make a big difference in sound and
vibration.
I was always afraid of making it too tight and cooking the bearings.
I'd
like to put a thermocouple on the drive near the bearing. I figure if
I
baseline the temps, maybe I'll see an increase if/when the bearing
starts to
go. Does this sound worthwhile to anyone?
Gary Krysztopik
Pelican PL - N522GK
Stratus Subaru EA-81
Newport, RI
http://members.efortress.com/flyink/index.html<http://members.efortress.
com/flyink/index.html>
----- Original Message -----
From: <clark.dale@att.net<mailto:clark.dale@att.net>>
To: <stratus-list@matronics.com<mailto:stratus-list@matronics.com>>
Subject: Stratus-List: Stratus belt failure
> --> Stratus-List message posted by:
clark.dale@att.net<mailto:clark.dale@att.net>
>
> I recently had the belt break on my Stratus EA81. I happened about
30
> seconds after lift off. I was able to dead stick the plane , an
Avid
> flyer on floats, back on the lake. The belt and redrive both have
about
> 200 hours on them and the belt was about three years old. The prop
pulley
> showed wear on the top of the teeth, the anodizing was worn off the
teeth
> on all the teeth on the prop pulley. The crank pulley also had some
of
> the anodizing missing on some of the teeth, but just small chips
missing.
> I talked to Mykal at stratus and he couldn't shed any light on what
may
> have happened. I suspect that maybe the tension was to tight on the
belt
> and or the tracking wasn't within tolerance. I am looking for a
complete
> stratus redrive if anyone has one for sale or knows of one I am
interested
> in buying.
> Dale 907 225 4930
>
> <!-- BEGIN WEBMAIL STATIONERY -->
>
>
> <!-- WEBMAIL STATIONERY noneset -->
> I recently had the belt break on my Stratus EA81. I happened about
30
> seconds after lift off. I was able to dead stick the plane , an Avid
flyer
> on floats, back on the lake. The belt and redrive both have about
200
> hours on them and the belt was about three years old. The prop
pulley
> showed wear on the top of the teeth, the anodizing was worn off the
teeth
> on all the teeth on the prop pulley. The crank pulley also had some
of the
> anodizing missing on some of the teeth, but just small chips
missing. I
> talked to Mykal at stratus and he couldn't shed any light on what
may have
> happened. I suspect that maybe the tension was to tight on the belt
and or
> the tracking wasn't within tolerance. I am looking for a complete
stratus
> redrive if anyone has one for sale or knows of one I am interested
in
> buying.
> Dale 907 225 4930
> <!-- END WEBMAIL STATIONERY -->
>
>
>
Message 6
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| Subject: | Stratus belt failure |
--> Stratus-List message posted by: Jim and Lucy <jpollard@ciaccess.com>
The first belt failure on a stratus setup I heard of was on the airsoob
list a couple years ago. The fellow was in Florida on a flying tour
with some other aircraft from South America . He was trying
to find a Florida source for a new belt. I have not heard of many
more may be about 2 others like Frank sez.
There were not many details possibly due to language difference problems.
Jim Pollard
Merlin Ont
ch601hds
ea81
Message 7
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| Subject: | Stratus belt failure |
--> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
Just when I got totally comfortable with this motor then I hear about
this...:)
Lets hope these are isolated random incidences and not a function of
more hours being put on the fleet!
Frank
Do not archive
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of Jim and
Lucy
Subject: RE: Stratus-List: Stratus belt failure
--> Stratus-List message posted by: Jim and Lucy <jpollard@ciaccess.com>
The first belt failure on a stratus setup I heard of was on the airsoob
list a couple years ago. The fellow was in Florida on a flying tour with
some other aircraft from South America . He was trying to find a Florida
source for a new belt. I have not heard of many more may be about 2
others like Frank sez.
There were not many details possibly due to language difference
problems.
Jim Pollard
Merlin Ont
ch601hds
ea81
Message 8
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| Subject: | Re: Stratus belt failure |
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
> The first belt failure on a stratus setup I heard of was on the airsoob
> list a couple years ago. The fellow was in Florida on a flying tour
> with some other aircraft from South America . He was trying
> to find a Florida source for a new belt. I have not heard of many
> more may be about 2 others like Frank sez.
> There were not many details possibly due to language difference problems.
i think i remember that one, but it was the old two-belt design and I think
he lost one belt and didn't know until he opened the hood (that's
autoconversion talk). that one and another two-belt failure were the only
stratus failures that i ever heard of before these two recent ones. as far
as these two - just to make myself feel better - one was a pretty old belt
(not hours used but years aged - and btw, i got my single-belt engine in
2000 and they were already single belt for a while so if John's belt was
from when they first switched over then it is at least 6 or 7 years old) and
the other may have been some kind of problem since the pulley was worn ?
gary
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