---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Tue 05/29/07: 5 ---------------------------------------------------------- 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 _____________________________________ Time: 01:51:15 PM PST US From: "Larry Cottrell" Subject: Kolb-List: 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 _____________________________________ Time: 07:29:51 PM PST US From: "Larry Cottrell" Subject: Kolb-List: bolts for props 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 _____________________________________ Time: 08:02:31 PM PST US From: "Richard Girard" Subject: Re: Kolb-List: 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 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 _____________________________________ Time: 08:44:28 PM PST US From: Dana Hague Subject: Re: Kolb-List: 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 _____________________________________ Time: 09:48:54 PM PST US From: "Richard Girard" Subject: Re: Kolb-List: 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 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. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.