---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Thu 01/21/10: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:52 AM - Re: Exhaust wrap/insulation ? (Geoff Heap) 2. 06:26 AM - Re: Prop bolts (catz631@aol.com) 3. 07:02 AM - Re: Prop bolts (Bob Borger) 4. 07:15 AM - Re: Prop bolts (John Pletting) 5. 07:21 AM - Re: Prop bolts (lucien) 6. 03:55 PM - Re: Re: More on ethanol (Noel Loveys) ________________________________ Message 1 _____________________________________ Time: 05:52:36 AM PST US Subject: RotaxEngines-List: Re: Exhaust wrap/insulation ? From: "Geoff Heap" Thanks to all that replied. I like Roger's method with the wrap. It suits my purpose well because I only want to use it to protect lines that pass close by. Mainly coolant. I would wrap only those area's of the exhaust. Many thanks. I love this list. I started building from plans in 1991. I still have a handwritten letter that I wrote to Chris Heinz about a small mod to my Slat spars. He marked it up with a few extra rivets and wrote that it would be fine. He replied quite quickly. I think thats about the time that I had my 286 Arche Rival......Geoff Read this topic online here: http://forums.matronics.com/viewtopic.php?p=282694#282694 ________________________________ Message 2 _____________________________________ Time: 06:26:17 AM PST US From: catz631@aol.com Subject: Re: RotaxEngines-List: Prop bolts Thanks for the input on the prop bolts guys. What does the 8.8 mean. Does it mean grade 8, and 8mm or has it do do with the thread. Dick Maddux Milton Fl ________________________________ Message 3 _____________________________________ Time: 07:02:18 AM PST US From: Bob Borger Subject: Re: RotaxEngines-List: Prop bolts Dick, Check: http://www.mcmaster.com/param/html/AboutCapScrewMaterial/ McMaster has lots of great information associated with their products on their web site. Bob Borger Europa XS Monowheel, Intercooled Rotax 914, Airmaster C/S prop On Thursday, January 21, 2010, at 08:21AM, wrote: > ________________________________ Message 4 _____________________________________ Time: 07:15:53 AM PST US From: "John Pletting" Subject: Re: RotaxEngines-List: Prop bolts Hi Dick---The numbers on the head of metric capscrews indicate the strength--In this case, 8.8 tells us that this metric capscrew is equal in strength to an american made grade 5 capscrew (indicated by 3 equally spaced radial marks on the head [100,000 to 120,000 lbs. tensile strength]). 10.9 on a metric hex head capscrew equals grade 8 american specs (150,000 to 160,000 lbs/sq. in.). John Pletting--Vancouver WA. ----- Original Message ----- From: catz631@aol.com To: rotaxengines-list@matronics.com Sent: Thursday, January 21, 2010 6:21 AM Subject: Re: RotaxEngines-List: Prop bolts Thanks for the input on the prop bolts guys. What does the 8.8 mean. Does it mean grade 8, and 8mm or has it do do with the thread. Dick Maddux Milton Fl ________________________________ Message 5 _____________________________________ Time: 07:21:14 AM PST US Subject: RotaxEngines-List: Re: Prop bolts From: "lucien" Here's another good basic chart on bolt grades: http://www.boltdepot.com/fastener-information/Materials-and-Grades/Bolt-Grade-Chart.aspx The grading system for metric and English sized bolts is slightly different with different units of measurement, etc. But there's a rough equivalence between some of the grades like 8..8 metric vs 5 English. The grades that manufacturers seem to choose for prop bolts for 912 class props are 8.8 for metric and grade 5 for English. Some manufacturers like Powerfin use stainless steel hardware (with, of course, specific installation requirements like they have to thread into mounting lugs in the flange and fairly precise torque requirements). These grades have the ductility required for that application. Harder bolts tend to be too brittle and have more risk of failure. But by now you should see bolts ain't all that simple ;) LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=282710#282710 ________________________________ Message 6 _____________________________________ Time: 03:55:02 PM PST US From: "Noel Loveys" Subject: RE: RotaxEngines-List: Re: More on ethanol I've never tried any fuel with ethanol in it... but from what I've read they describe vinyl-ester as being ethanol resistant... Whatever that means. Apparently that's what they are making the underground fuel tanks out of now. They are supposed to have a twenty year guarantee. What that covers who knows. Noel From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Dave Austin Sent: January 20, 2010 10:13 PM Subject: Re: RotaxEngines-List: Re: More on ethanol How does a vinyl-ester gas tank handle ethanol as apposed to epoxy or poly? Anyone know? 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