Today's Message Index:
----------------------
1. 01:51 PM - Alvord flying videos (Larry Cottrell)
2. 07:29 PM - bolts for props (Larry Cottrell)
3. 08:02 PM - Re: bolts for props (Richard Girard)
4. 08:44 PM - Re: bolts for props (Dana Hague)
5. 09:48 PM - Re: bolts for props (Richard Girard)
Message 1
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| Subject: | Alvord flying videos |
Hi,
Things seem a bit boring, so here are a couple of videos for you
taken on the Alvord Desert.
Larry, Oregon
http://video.google.com/videoplay?docid=-291975136420718548
http://video.google.com/videoplay?docid=8252079461989792144
Message 2
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Ok, I need a bit of help regarding prop bolts. The ones in my plane are
a 8.8 which is metric, right? Somehow I am having trouble believing a
generic Metric bolt is the proper bolt for the job. I need to put a
spacer between the warp and the drive. The trip to MV really beat up the
aileron gap seal, and I could use some noise reduction. Someone please
confirm that I can buy the 6 inch 8.8 metric at Nampa without committing
suicide.
Larry, Oregon
Message 3
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| Subject: | Re: bolts for props |
Larry, 8.8 metric is the same strength as grade 5 except that 8.8 is an
alloy steel fastener like grade 6 (AN bolts). They are very ductile, so as
prop bolts they can absorb the stresses placed upon them.
I recently had to call a prop maker to get their recommendation for bolts.
Metric 8.8 or stainless steel were the only bolts they would recommend.
Since the drive was threaded UNC I couldn't use 8.8, but commercial
stainless was available and satisfied the prop maker even though the yield
and ultimate strength were 40% less than 8.8 metric (but comparable to the
stainless metric hardware).
Rick
On 5/29/07, Larry Cottrell <lcottrell@fmtcblue.com> wrote:
>
> Ok, I need a bit of help regarding prop bolts. The ones in my plane are a
> 8.8 which is metric, right? Somehow I am having trouble believing a
> generic Metric bolt is the proper bolt for the job. I need to put a spacer
> between the warp and the drive. The trip to MV really beat up the aileron
> gap seal, and I could use some noise reduction. Someone please confirm that
> I can buy the 6 inch 8.8 metric at Nampa without committing suicide.
> Larry, Oregon
>
> *
>
>
> *
>
>
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport.
Message 4
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| Subject: | Re: bolts for props |
At 11:01 PM 5/29/2007, Richard Girard wrote:
>Larry, 8.8 metric is the same strength as grade 5 except that 8.8 is an
>alloy steel fastener like grade 6 (AN bolts). They are very ductile, so as
>prop bolts they can absorb the stresses placed upon them...
An 8.8 metric bolt also alloy steel, and so is grade 5 and grade 8. AN
bolts aren't grade 6 (there is no such thing, well actually there is but
you'll never see one); they're simply AN bolts. Strengthwise they're
equivalent to grade 5 but the quality control is much better than
commercial grade 5 bolts. Tensile strength of an AN bolt is slightly
better than a coarse thread grade 5 since the thread root diameter is
slightly larger.
I'm not thrilled with the idea of using a generic stainless metric bolt to
hold a prop on, unless I saw the manufacturer's specs (since metric
stainless fasteners aren't graded like the alloy steel ones are.
-Dana
--
--
Okay, who put a "stop payment" on my reality check?
Message 5
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| Subject: | Re: bolts for props |
Dana, When I was researching bolt characteristics, the varying grading
bodies define both grade 5 and 8 as carbon steels, the 8.8 metric and grade
6 (read the dashes on the head, grade 5 has three, grade 6 has four, grade 8
has six) i.e. AN bolts, are listed as alloy steel. I did not go so far as to
get the specific alloy, my memory from a recent class was one of the 4000
series alloys but I haven't confirmed that.
As for the the stainless steel bolts, I used industrial grade bolts which
are made to a standard and for which data was available to show that the
bolts were equivalent to the metric bolts supplied by the prop maker (and
are his standard bolt, by the way).
Rick
On 5/29/07, Dana Hague <d-m-hague@comcast.net> wrote:
>
>
> At 11:01 PM 5/29/2007, Richard Girard wrote:
> >Larry, 8.8 metric is the same strength as grade 5 except that 8.8 is an
> >alloy steel fastener like grade 6 (AN bolts). They are very ductile, so
> as
> >prop bolts they can absorb the stresses placed upon them...
>
> An 8.8 metric bolt also alloy steel, and so is grade 5 and grade 8. AN
> bolts aren't grade 6 (there is no such thing, well actually there is but
> you'll never see one); they're simply AN bolts. Strengthwise they're
> equivalent to grade 5 but the quality control is much better than
> commercial grade 5 bolts. Tensile strength of an AN bolt is slightly
> better than a coarse thread grade 5 since the thread root diameter is
> slightly larger.
>
> I'm not thrilled with the idea of using a generic stainless metric bolt to
> hold a prop on, unless I saw the manufacturer's specs (since metric
> stainless fasteners aren't graded like the alloy steel ones are.
>
> -Dana
>
> --
> --
> Okay, who put a "stop payment" on my reality check?
>
>
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport.
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