Today's Message Index:
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0. 12:20 AM - November List Fund Raiser (Matt Dralle)
1. 07:32 AM - WTB 912 guages (egp8111)
2. 10:38 AM - Re: Re: Prop Strike crank damage (bjones@dmv.com)
3. 10:54 AM - Re: Prop Strike crank damage (lucien)
4. 12:15 PM - Re: Re: Prop Strike crank damage (Richard Girard)
5. 12:37 PM - The morgans (Richard Girard)
6. 03:05 PM - Re: The morgans (FLYaDIVE)
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| Subject: | November List Fund Raiser |
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Message 1
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I'm looking for 912 guages (tach,oil psi,oil temp,cht) for my 912 re-engine
project. If anyone has any they would like to sell please contact me
thanks,
EG
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318031#318031
Message 2
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| Subject: | Re: Prop Strike crank damage |
Re crank failure due to prop strike;
MY info is second hand and limited to what was in the
eai posts.
Sorry.
BJ
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: "vernon mitchell" <vernon11@xsinet.co.za>
Sender: owner-rotaxengines-list-server@matronics.com
Subject: Re: RotaxEngines-List: Re: Prop Strike crank damage
This is a multi-part message in MIME format.
Message 3
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| Subject: | Re: Prop Strike crank damage |
I've always thought that a prop strike caused the "New Engine" light to come on
in the panel.... ;)
Couldn't you tell if the journals had been twisted with a timing check? I.e. with
a dial indicator put into the SP hole and a protractor on the crank?
Unless it was a new engine, I always figured a prop strike put you in the neighborhood
of a new engine cost-wise anyway, so down to the bank... with a gun...
;)
LS
--------
LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318055#318055
Message 4
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| Subject: | Re: Prop Strike crank damage |
Lucien, all, I don't think we're talking anything more than a few
thousandths of an inch of twist out of register in the crank before
significant damage happens to the main bearings. As you look at the crank
you can see that the front and rear main bearing segments each carry a rod
journal and the center main bearing segment carries a rod journal on each
side. Connecting those three segments are essentially just plates. Now refer
to Rotax table of limits for measuring the crank. First, it's done at the
magneto drive end of the crank, not at the gearbox end and the 100% wear
limit is only .0007" ( 7 ten thousandths of an inch ) over the maximum
allowed for a brand new crank. Without splitting the case, what assumption
would you have to make about any given movement of an individual crank
segment? That movement most likely occurs at the plate connecting the crank
nose and the center segments? Or does it reflect through all segments
equally?
For simplicity let's say all movement happens at the plate between rod
journal 1 and 2 so that you get a reading of .0034" at the mag end and to
further simplify all movement happens on rod journal 1. Even if you had a
perfect, zero spec crank to start with, you are only talking .0017".
Measuring something at the top of the piston you'd have to decide how much,
if any, variation could be accounted for by piston rock, wrist pin wear, rod
journal wear, and rod bearing wear just to name a few. You could drive
yourself nuts trying to factor in all those sources of measurement error,
much less finding sine tables with enough accuracy to get measurement values
and we haven't begun to think about movement caused by environmental factors
not even related to the engine. Is the moon in the wrong position? Tide out
or in?
Okay, I'm kidding with the last, but you get the idea.
Just to illustrate how difficult fine measurements like these can be, I have
a precision level that I only use to set the bed of my engine lathe. It is
so sensitive that the bubble will measure a change when I take a step. I
cause the concrete pad on which the lathe sits to flex and the bubble moves.
I don't drink coffee on the day I'm going to use it.
Rick Girard
On Wed, Nov 3, 2010 at 12:52 PM, lucien <lstavenhagen@hotmail.com> wrote:
> lstavenhagen@hotmail.com>
>
> I've always thought that a prop strike caused the "New Engine" light to
> come on in the panel.... ;)
>
> Couldn't you tell if the journals had been twisted with a timing check?
> I.e. with a dial indicator put into the SP hole and a protractor on the
> crank?
>
> Unless it was a new engine, I always figured a prop strike put you in the
> neighborhood of a new engine cost-wise anyway, so down to the bank... with a
> gun... ;)
>
> LS
>
> --------
> LS
> Titan II SS
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=318055#318055
>
>
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable
to imagine how we might possibly have gone wrong.
- G.K. Chesterton
Message 5
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Does anyone besides me get a notice from the postmaster about
themorgans@fairadsl.co.uk having a full mailbox when ever posting something
to this forum? Could someone go tell them to either get off the list or
clean out their mailbox.
Rick Girard
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable
to imagine how we might possibly have gone wrong.
- G.K. Chesterton
Message 6
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Rick:
I also have been getting all sorts of 'Postmaster' messages and I am not
sure if my posts have been making it to the group.
Barry
On Wed, Nov 3, 2010 at 3:25 PM, Richard Girard <aslsa.rng@gmail.com> wrote:
> Does anyone besides me get a notice from the postmaster about
> themorgans@fairadsl.co.uk having a full mailbox when ever posting
> something to this forum? Could someone go tell them to either get off the
> list or clean out their mailbox.
>
> Rick Girard
>
> --
> Zulu Delta
> Kolb Mk IIIC
> 582 Gray head
> 4.00 C gearbox
> 3 blade WD
> Thanks, Homer GBYM
>
> It is not bigotry to be certain we are right; but it is bigotry to be
> unable to imagine how we might possibly have gone wrong.
> - G.K. Chesterton
>
>
> *
>
>
--
Barry
"Chop'd Liver"
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