Today's Message Index:
----------------------
1. 10:55 AM - Re: AW: Re: 912 with low RPM--- new vibration problem-fixed (Les Goldner)
2. 11:34 AM - Re: AW: Re: 912 with low RPM--- new vibration problem-fixed (Jack Kuehn)
3. 03:41 PM - Re: AW: Re: 912 with low RPM--- new vibration problem-fixed (Les Goldner)
4. 04:03 PM - Does it have a Clutch? (Les Goldner)
5. 04:12 PM - Re: AW: Re: 912 with low RPM--- new vibration problem-fixed (Jack Kuehn)
6. 04:37 PM - Re: Does it have a Clutch? (Bill and Marsha)
7. 07:06 PM - Re: Does it have a Clutch? (Les Goldner)
8. 09:28 PM - AW: Re: 912 with low RPM--- new vibration problem-fixed (Roger Lee)
Message 1
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| Subject: | Re: AW: Re: 912 with low RPM--- new vibration problem-fixed |
The vibration problem was not due to prop balance. It was a combination of
slightly loose bolts that mount the 912 engine and a slightly off carb sync.
The mechanic told me that the bottom-only mounts will loosen up because the
engine isn't support right. Unless you add mounts on top of the engine these
bolts need serious attention. He suggested changing the four 10mm bolts to
studs and using lock washers, which he said won't loosen.
Les
> -----Original Message-----
> From: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] On
> Behalf Of Thom Riddle
> Sent: Sunday, March 16, 2008 11:33 AM
> To: rotaxengines-list@matronics.com
> Subject: RotaxEngines-List: AW: Re: 912 with low RPM--- new
> vibration problem
>
> --> <riddletr@gmail.com>
>
> Gtblu,
>
> In answer to your question about vibration smoothing out at
> 5400 rpm, yes, it is possible. As the centrifugal forces
> increase with increasing rpm, the apparent out-of-trackness
> at places other than the tip could disappear. Do you know
> which blade is running out of track? You might consider
> removing the blades and comparing them to each other on a
> true flat surface in several directions. If one of them is
> measurably out of synch with the others that could be your
> problem and a blade replacement might resolve the issue.
>
> --------
> Thom Riddle
> N221FA Allegro 2000 912UL
> N197BG FS1/447
> --------------------
> Believe nothing, no matter where you read it or who has said
> it, not even if I have said it, unless it agrees with your
> own reason and your own common sense.
> - Buddha
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=170197#170197
>
>
>
>
>
>
>
> Photoshare, and much much more:
>
>
Message 2
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| Subject: | Re: AW: Re: 912 with low RPM--- new vibration problem-fixed |
What airplane is your Rotax in? Sorry, I've lost track!!
Jack
On Thu, Mar 20, 2008 at 11:51 AM, Les Goldner
<lgold@quantum-associates.com> wrote:
>
> The vibration problem was not due to prop balance. It was a combination of
> slightly loose bolts that mount the 912 engine and a slightly off carb sync.
> The mechanic told me that the bottom-only mounts will loosen up because the
> engine isn't support right. Unless you add mounts on top of the engine these
> bolts need serious attention. He suggested changing the four 10mm bolts to
> studs and using lock washers, which he said won't loosen.
> Les
>
> > -----Original Message-----
> > From: owner-rotaxengines-list-server@matronics.com
> > [mailto:owner-rotaxengines-list-server@matronics.com] On
> > Behalf Of Thom Riddle
> > Sent: Sunday, March 16, 2008 11:33 AM
> > To: rotaxengines-list@matronics.com
> > Subject: RotaxEngines-List: AW: Re: 912 with low RPM--- new
> > vibration problem
> >
> > --> <riddletr@gmail.com>
> >
> > Gtblu,
> >
> > In answer to your question about vibration smoothing out at
> > 5400 rpm, yes, it is possible. As the centrifugal forces
> > increase with increasing rpm, the apparent out-of-trackness
> > at places other than the tip could disappear. Do you know
> > which blade is running out of track? You might consider
> > removing the blades and comparing them to each other on a
> > true flat surface in several directions. If one of them is
> > measurably out of synch with the others that could be your
> > problem and a blade replacement might resolve the issue.
> >
> > --------
> > Thom Riddle
> > N221FA Allegro 2000 912UL
> > N197BG FS1/447
> > --------------------
> > Believe nothing, no matter where you read it or who has said
> > it, not even if I have said it, unless it agrees with your
> > own reason and your own common sense.
> > - Buddha
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=170197#170197
> >
> >
> >
> >
> >
> >
> >
> > Photoshare, and much much more:
> >
> >
>
>
Message 3
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| Subject: | Re: AW: Re: 912 with low RPM--- new vibration problem-fixed |
Jack,
The plane is a Zenith CH701 STOL/bush plane with 20 hours on it. I have
attached a picture but don't know if Matronics will post it. Zenith came out
with a better 912 mounting arrangement this year, but I don't want to spend
the bucks and time it would take to install it.
Les
> -----Original Message-----
> From: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] On
> Behalf Of Jack Kuehn
> Sent: Thursday, March 20, 2008 11:31 AM
> To: rotaxengines-list@matronics.com
> Subject: Re: RotaxEngines-List: AW: Re: 912 with low RPM---
> new vibration problem-fixed
>
> --> <jack.kuehn@gmail.com>
>
> What airplane is your Rotax in? Sorry, I've lost track!!
>
> Jack
>
> On Thu, Mar 20, 2008 at 11:51 AM, Les Goldner
> <lgold@quantum-associates.com> wrote:
> > --> <lgold@quantum-associates.com>
> >
> > The vibration problem was not due to prop balance. It was a
> > combination of slightly loose bolts that mount the 912
> engine and a slightly off carb sync.
> > The mechanic told me that the bottom-only mounts will loosen up
> > because the engine isn't support right. Unless you add
> mounts on top
> > of the engine these bolts need serious attention. He suggested
> > changing the four 10mm bolts to studs and using lock
> washers, which he said won't loosen.
> > Les
> >
> > > -----Original Message-----
> > > From: owner-rotaxengines-list-server@matronics.com
> > > [mailto:owner-rotaxengines-list-server@matronics.com] On
> > Behalf
> > Of Thom Riddle > Sent: Sunday, March 16, 2008 11:33 AM > To:
> > rotaxengines-list@matronics.com > Subject:
> RotaxEngines-List: AW: Re:
> > 912 with low RPM--- new > vibration problem > > -->
> > > --> <riddletr@gmail.com>
> > >
> > > Gtblu,
> > >
> > > In answer to your question about vibration smoothing out
> at > 5400
> > rpm, yes, it is possible. As the centrifugal forces >
> increase with
> > increasing rpm, the apparent out-of-trackness > at places
> other than
> > the tip could disappear. Do you know > which blade is
> running out of
> > track? You might consider > removing the blades and
> comparing them to
> > each other on a > true flat surface in several directions.
> If one of
> > them is > measurably out of synch with the others that
> could be your
> > > problem and a blade replacement might resolve the issue.
> > >
> > > --------
> > > Thom Riddle
> > > N221FA Allegro 2000 912UL
> > > N197BG FS1/447
> > > --------------------
> > > Believe nothing, no matter where you read it or who has
> said > it,
> > not even if I have said it, unless it agrees with your >
> own reason
> > and your own common sense.
> > > - Buddha
> > >
> > >
> > >
> > >
> > > Read this topic online here:
> > >
> > > http://forums.matronics.com/viewtopic.php?p=170197#170197
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Photoshare, and much much more:
> > >
> > >
> >
> >
> >
> >
> >
> >
>
> Photoshare, and much much more:
>
>
Message 4
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| Subject: | Does it have a Clutch? |
How can I find out if my 912ULS includes a clutch? I understand that Rotax
started including them with all 912s about the time my engine was purchased,
about 4-years ago. Since I purchased it, unused, with my Zenith kit (it now
has about 25 hours on it) I never got any documentation about this. I have
been told that, with a clutch, the engine would do a lot better in a prop
strike.
The engine's SR is 5643233.
Thanks,
Les
Message 5
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| Subject: | Re: AW: Re: 912 with low RPM--- new vibration problem-fixed |
The picture came through fine. Nice Airplane!!!
On Thu, Mar 20, 2008 at 4:38 PM, Les Goldner
<lgold@quantum-associates.com> wrote:
> Jack,
> The plane is a Zenith CH701 STOL/bush plane with 20 hours on it. I have
> attached a picture but don't know if Matronics will post it. Zenith came out
> with a better 912 mounting arrangement this year, but I don't want to spend
> the bucks and time it would take to install it.
>
> Les
>
> > -----Original Message-----
> > From: owner-rotaxengines-list-server@matronics.com
> > [mailto:owner-rotaxengines-list-server@matronics.com] On
>
> > Behalf Of Jack Kuehn
> > Sent: Thursday, March 20, 2008 11:31 AM
> > To: rotaxengines-list@matronics.com
> > Subject: Re: RotaxEngines-List: AW: Re: 912 with low RPM---
> > new vibration problem-fixed
> >
> > --> <jack.kuehn@gmail.com>
>
>
> >
> > What airplane is your Rotax in? Sorry, I've lost track!!
> >
> > Jack
> >
> > On Thu, Mar 20, 2008 at 11:51 AM, Les Goldner
> > <lgold@quantum-associates.com> wrote:
> > > --> <lgold@quantum-associates.com>
> > >
> > > The vibration problem was not due to prop balance. It was a
> > > combination of slightly loose bolts that mount the 912
> > engine and a slightly off carb sync.
> > > The mechanic told me that the bottom-only mounts will loosen up
> > > because the engine isn't support right. Unless you add
> > mounts on top
> > > of the engine these bolts need serious attention. He suggested
> > > changing the four 10mm bolts to studs and using lock
> > washers, which he said won't loosen.
> > > Les
> > >
> > > > -----Original Message-----
> > > > From: owner-rotaxengines-list-server@matronics.com
> > > > [mailto:owner-rotaxengines-list-server@matronics.com] On
> > > Behalf
> > > Of Thom Riddle > Sent: Sunday, March 16, 2008 11:33 AM > To:
> > > rotaxengines-list@matronics.com > Subject:
> > RotaxEngines-List: AW: Re:
> > > 912 with low RPM--- new > vibration problem > > -->
> > > > --> <riddletr@gmail.com>
> > > >
> > > > Gtblu,
> > > >
> > > > In answer to your question about vibration smoothing out
> > at > 5400
> > > rpm, yes, it is possible. As the centrifugal forces >
> > increase with
> > > increasing rpm, the apparent out-of-trackness > at places
> > other than
> > > the tip could disappear. Do you know > which blade is
> > running out of
> > > track? You might consider > removing the blades and
> > comparing them to
> > > each other on a > true flat surface in several directions.
> > If one of
> > > them is > measurably out of synch with the others that
> > could be your
> > > > problem and a blade replacement might resolve the issue.
> > > >
> > > > --------
> > > > Thom Riddle
> > > > N221FA Allegro 2000 912UL
> > > > N197BG FS1/447
> > > > --------------------
> > > > Believe nothing, no matter where you read it or who has
> > said > it,
> > > not even if I have said it, unless it agrees with your >
> > own reason
> > > and your own common sense.
> > > > - Buddha
> > > >
> > > >
> > > >
> > > >
> > > > Read this topic online here:
> > > >
> > > > http://forums.matronics.com/viewtopic.php?p=170197#170197
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Photoshare, and much much more:
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> > Photoshare, and much much more:
> >
> >
>
Message 6
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| Subject: | Re: Does it have a Clutch? |
Les You can tell by the part# of the gearbox, the # will be stamped on
the top of the gearbox. 888-560 = no clutch 887-712 = with clutch.
If your # is other, I can probably cross check. Doc
----- Original Message -----
From: Les Goldner
To: rotaxengines-list@matronics.com
Sent: Thursday, March 20, 2008 5:59 PM
Subject: RotaxEngines-List: Does it have a Clutch?
How can I find out if my 912ULS includes a clutch? I understand that
Rotax started including them with all 912s about the time my engine was
purchased, about 4-years ago. Since I purchased it, unused, with my
Zenith kit (it now has about 25 hours on it) I never got any
documentation about this. I have been told that, with a clutch, the
engine would do a lot better in a prop strike.
The engine's SR is 5643233.
Thanks,
Les
Message 7
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| Subject: | Does it have a Clutch? |
Thanks Doc,
I'll check the number next time I'm at the airport.
Les
_____
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Bill and
Marsha
Sent: Thursday, March 20, 2008 4:33 PM
Subject: Re: RotaxEngines-List: Does it have a Clutch?
Les You can tell by the part# of the gearbox, the # will be stamped on the
top of the gearbox. 888-560 = no clutch 887-712 = with clutch. If
your # is other, I can probably cross check. Doc
----- Original Message -----
From: Les Goldner <mailto:lgold@quantum-associates.com>
Sent: Thursday, March 20, 2008 5:59 PM
Subject: RotaxEngines-List: Does it have a Clutch?
How can I find out if my 912ULS includes a clutch? I understand that Rotax
started including them with all 912s about the time my engine was purchased,
about 4-years ago. Since I purchased it, unused, with my Zenith kit (it now
has about 25 hours on it) I never got any documentation about this. I have
been told that, with a clutch, the engine would do a lot better in a prop
strike.
The engine's SR is 5643233.
Thanks,
Les
href="http://www.matronics.com/Navigator?RotaxEngines-List">http://www.matro
nics.com/Navigator?RotaxEngines-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 8
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| Subject: | Re: AW: Re: 912 with low RPM--- new vibration problem-fixed |
Congratulations Les,
I know that chasing a ghost can be very frustrating to say the least.
Your problem solving will help us all identify issues and where to look when the
answer is not obvious.
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=171420#171420
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