---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Fri 07/07/17: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:19 PM - Re: Mag timing HS6A is the book wrong? (JL2A) 2. 03:43 PM - Re: Re: Mag timing HS6A is the book wrong? (Walter Lannon) 3. 05:00 PM - Re: Re: Mag timing HS6A is the book wrong? (John B) 4. 06:03 PM - Magneto failure CD-5 (glipaz) ________________________________ Message 1 _____________________________________ Time: 02:19:23 PM PST US Subject: Yak-List: Re: Mag timing HS6A is the book wrong? From: "JL2A" No disrespect taken. Just thought there was more to it than either myself or Matt had figured. 9 cylinders, 720d rotation of rotor to fire them all 98=1.125 thanks CP! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=470770#470770 ________________________________ Message 2 _____________________________________ Time: 03:43:28 PM PST US From: "Walter Lannon" Subject: Re: Yak-List: Re: Mag timing HS6A is the book wrong? Thank you; Yes, 9 cyls., 720* Crankshaft rotation, 810* Mag. drive rotation. If it were a standard 4 lobe rotor that also would turn 810* but it is a compensated 9 lobe rotor (radial engines only) that turns 360* or 0.5 X Crankshaft (Internally geared to mag. drive) Walt -----Original Message----- From: JL2A Sent: Friday, July 07, 2017 2:16 PM Subject: Yak-List: Re: Mag timing HS6A is the book wrong? No disrespect taken. Just thought there was more to it than either myself or Matt had figured. 9 cylinders, 720d rotation of rotor to fire them all 98=1.125 thanks CP! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=470770#470770 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 3 _____________________________________ Time: 05:00:50 PM PST US From: John B Subject: Re: Yak-List: Re: Mag timing HS6A is the book wrong? Timing issues... Gentlemen, would it be possible to condense this tribal knowledge into a manual that applies to both the CJ and Yak aircraft? Step-by-step, using various methods? John B On Fri, Jul 7, 2017 at 4:16 PM, JL2A wrote: > > No disrespect taken. Just thought there was more to it than either myself > or Matt had figured. > > 9 cylinders, 720d rotation of rotor to fire them all > > 9=C3=B78=1.125 > > thanks CP! > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=470770#470770 > > =========== =========== =========== =========== =========== > > ________________________________ Message 4 _____________________________________ Time: 06:03:13 PM PST US Subject: Yak-List: Magneto failure CD-5 From: "glipaz" Conundrum: At runup, Mag 2 failed (engine turned off). Engine ran smoothly on Mag 1. Returned to chocks and opened Mag 2 to discover a broken points spring. Obvious hard break. Replaced points and opened Mag 1 to inspect. Discovered that the rotor on Mag 1 was completely loose (all three bolts were loose). Tightened rotor on Mag 1, closed both mags and fired it up. Started easily. Mag 2 now worked fine but now Mag 1 failed. What?! Thought it might be a switch problem. Tested Mag switch to make sure it was not a wiring short to ground and it checked ok. Back to the Mag. Inspected rotor and cap. Ok. Checked points. Open fine. Replaced cigarette. Still wouldn't fire. Replaced coil. Still wouldn't fire. Finally replaced Mag. Motor fired and tested fine on both mags. Runup Mag check normal. Note: we turned the bad Mag 1 by hand and could not get a spark out of the cigarette and the Mag turned fairly freely, without the normal flopping that the magnets provide. The mystery is this: assuming Mag 1 was fine and Mag 2 had a hard break prior to shutdown (prior Mag checks on Mag 1 were fine) how did it fail after tightening down the rotor? Why is it now producing no spark and seems to have lost its magnetism? Prior to this both Mags worked fine on previous runups and flights. Gil Lipaz Read this topic online here: http://forums.matronics.com/viewtopic.php?p=470780#470780 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-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/yak-list Browse Digests http://www.matronics.com/digest/yak-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.