Today's Message Index:
----------------------
0. 12:31 AM - Value of the List... (Matt Dralle)
1. 05:19 AM - engine (robert bean)
2. 07:04 AM - Re: torque on various bolts (cristalclear13)
3. 08:19 AM - Re: Re: torque on various bolts (Richard & Martha Neilsen)
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| Subject: | Value of the List... |
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Email List Admin.
Message 1
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This would be a good powerplant for a FSII.
-only two drawbacks: located BC, Canada
have to modify the oil pan as a drain tray for dry sump.
paste to eBay: 320319978344
BB
do not archive
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| Subject: | Re: torque on various bolts |
Hey, I found an old letter from Kolb dated April 24, 1989 in some of the paperwork
I got with my plane when I bought it. It says:
"The standard propeller supplied with the kit (66" dia., 2 blade wooden prop) should
be torqued to 120 in.lbs - no more and no less. Too little torque results
in a propeller that does not have enough friction with the hub to drive the
prop, which results in the bolts taking the hammering from the drive pulses from
the engine. They eventually will be sheared. Too much tension and the wood
will be crushed, which again will make it more likely that the prop bolts will
come loose with the same results. In a proper installation the prop bolts
should serve only to provide clamping pressure between the prop and the hub -
they ideally should not be exposed to any shear (twisting) type loads. The friction
between the prop and the hub should transmit 100% of the torque of the
engine."
They gave this warning after some bolts broke on a Mark II.
I've come to the conclusion that my prop manufacturer has gone out of business
and since I have no information about my prop I'll have to go by that newsletter
I found stating to use 120 in.lbs (unless anyone knows of any updates since
1989). The sticker on the prop says "Precision Propellers, Inc." and has a toll-free
number, but when I call that number a lady answers that has never heard
of them. When I search for them on the internet I found an old telephone number
that is out of service and no internet site is available for them.
Concerning the engine mount bolts...I am aware of the 43-13B chart because I took
the inspection class, but my concern was that the engine mount bolts might
be an exception similar to the prop bolts. If they are not an exception then
I'll just go by the chart.
Thanks to all for your replies.
--------
Cristal Waters
Kolb Mark II Twinstar
Rotax 503 DCSI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=216041#216041
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| Subject: | Re: torque on various bolts |
Cristal
I think someone else mentioned it before but... be sure to retorque your
prop bolts every time there are big changes in temperature or humidity. Wood
props shrink and swell with these changes. I lost a prop once because I
didn't know I need to retorque the bolts.
Seems like the instructions were to remove the torque allow the wood to
relax for a few minutes then retorque.
Rick Neilsen
Redrive VW powered MKIIIC
----- Original Message -----
From: "cristalclear13" <cristalclearwaters@gmail.com>
Sent: Monday, November 24, 2008 10:03 AM
Subject: Kolb-List: Re: torque on various bolts
> <cristalclearwaters@gmail.com>
>
> Hey, I found an old letter from Kolb dated April 24, 1989 in some of the
> paperwork I got with my plane when I bought it. It says:
>
> "The standard propeller supplied with the kit (66" dia., 2 blade wooden
> prop) should be torqued to 120 in.lbs - no more and no less. Too little
> torque results in a propeller that does not have enough friction with the
> hub to drive the prop, which results in the bolts taking the hammering
> from the drive pulses from the engine. They eventually will be sheared.
> Too much tension and the wood will be crushed, which again will make it
> more likely that the prop bolts will come loose with the same results. In
> a proper installation the prop bolts should serve only to provide clamping
> pressure between the prop and the hub - they ideally should not be exposed
> to any shear (twisting) type loads. The friction between the prop and the
> hub should transmit 100% of the torque of the engine."
>
> They gave this warning after some bolts broke on a Mark II.
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