---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 06/14/17: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:09 AM - Re: MP100701 Open Collector To Ground Position Sensor (Robert L. Nuckolls, III) 2. 07:19 AM - Re: RV-8 wiring diagram (tnikkel) 3. 08:18 AM - Re: Question about Z19RB and OVP/Beaker and size wire (Achille) 4. 09:30 AM - Re: RV-8 wiring diagram (user9253) 5. 03:43 PM - Re: MP100701 Open Collector To Ground Position Sensor (William Hunter) ________________________________ Message 1 _____________________________________ Time: 06:09:15 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: MP100701 Open Collector To Ground Position Sensor >d > >These magnets are like really... REALLY small and if I place them on >one corner of the door (one magnet on the door and one on the air >box structure) then there will be about 2.5 inches of distance to >the adjacent corner where the magic switch can be installed... then >perhaps there will be enough distance to reduce any magnetic >interference. I will buy this sensor and conduct some fiddling >around and report back. Ohhhh . . I thought the magnets were going to be CLOSE. 2.5" is like 'across the street'. If they were, say 0.5" apart, there MIGHT be valid interaction concerns to be resolved but 2.5" is plenty. I don't recall now which 60's Cessna used a similar alternate air door but the magnet holding it closed was a rather pedestrian cabinet door latch. Gravity would re-close the door. There were no annunciators on that system. The door magnet doesn't want/need to be very stout . . . pressure drop through a clean filter is, by design, as low as practical . . . measured in inches of water. You can calculate the force offered by such differentials and use it to test the release pressure of the finished assembly. Just remember that the total force is spread out over the door area and averages 1/2 the total applied to center of the door (class 2 lever). There is a boat load of magnet choices on eBay including disks with countersunk holes for screw mounting. http://tinyurl.com/ycoxy94d A spring-force gage can be crafted to check the door open calibration. I think I'd encase the mounted magnet in a layer of glass . . . while the risk is low, these things do break and the particles are akin to crushed carbide . . . not something friendly to engines. Bob . . . ________________________________ Message 2 _____________________________________ Time: 07:19:57 AM PST US Subject: AeroElectric-List: Re: RV-8 wiring diagram From: "tnikkel" Thanks for your comment i appreciate the feed back. Some of the feeders are bigger than they need to be but that's the wires I have. I see the downsides of having the start switch on the yoke but i do want it there. I have an enable switch which disarms the switch on the yoke. The enable switch also disconnects the e-bus during start. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=470104#470104 ________________________________ Message 3 _____________________________________ Time: 08:18:19 AM PST US Subject: AeroElectric-List: Re: Question about Z19RB and OVP/Beaker and size wire From: "Achille" Thank you Bob for your response. How could I check if my alternator is compatible with en external OVP before wiring it ? (it is not wired anymore) It was wired like the picture attached in this message. (drawn by constructeur) Thank you. Mickal Read this topic online here: http://forums.matronics.com/viewtopic.php?p=470107#470107 Attachments: http://forums.matronics.com//files/capture_dcran_2017_06_14__171455_169.png http://forums.matronics.com//files/capture_dcran_2017_06_14__171448_651.png http://forums.matronics.com//files/capture_dcran_2017_06_14__170900_296.png http://forums.matronics.com//files/capture_dcran_2017_06_14__165206_149.png ________________________________ Message 4 _____________________________________ Time: 09:30:39 AM PST US Subject: AeroElectric-List: Re: RV-8 wiring diagram From: "user9253" OK, I overlooked the switch that isolates the E-Bus during engine start. Your wiring diagram looks OK to me. > The enable switch also disconnects the e-bus during start. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=470114#470114 ________________________________ Message 5 _____________________________________ Time: 03:43:27 PM PST US From: "William Hunter" Subject: RE: AeroElectric-List: MP100701 Open Collector To Ground Position Sensor > I thought the magnets were going to be CLOSE. 2.5" is like 'across the street'. The flapper door is 4 inches long and 2.5 inches wide. Plan A (what is currently built) has a =BD inch diameter magnet mounted in the middle of the 2.5 inch door frame=85so not like across the street but in the same housing complex. These toothbrush magnets are very strong so perhaps I could install them on one corner and then the switch on the other corner. > I don't recall now which 60's Cessna used a similar alternate air door but the magnet holding it closed was a rather pedestrian cabinet door latch. Gravity would re-close the door. They stole my idea=85HOW RUDE!!! >There were no annunciators on that system. Sorta takes the fun out of it=85Well I suppose their engineering budget was a bit more than mine so they would not really need a monitoring circuit. I could teach my cute little EFIS girl to say =93MONITOR=94 when the door opens but I guess that might be too 2017=85a =93light=94 will do. .. Cheers!!! Bill Hunter From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Wednesday, June 14, 2017 6:08 AM Subject: Re: AeroElectric-List: MP100701 Open Collector To Ground Position Sensor d These magnets are like really... REALLY small and if I place them on one corner of the door (one magnet on the door and one on the air box structure) then there will be about 2.5 inches of distance to the adjacent corner where the magic switch can be installed... then perhaps there will be enough distance to reduce any magnetic interference. I will buy this sensor and conduct some fiddling around and report back. Ohhhh . . I thought the magnets were going to be CLOSE. 2.5" is like 'across the street'. If they were, say 0.5" apart, there MIGHT be valid interaction concerns to be resolved but 2.5" is plenty. I don't recall now which 60's Cessna used a similar alternate air door but the magnet holding it closed was a rather pedestrian cabinet door latch. Gravity would re-close the door. There were no annunciators on that system. The door magnet doesn't want/need to be very stout . . . pressure drop through a clean filter is, by design, as low as practical . . . measured in inches of water. You can calculate the force offered by such differentials and use it to test the release pressure of the finished assembly. Just remember that the total force is spread out over the door area and averages 1/2 the total applied to center of the door (class 2 lever). There is a boat load of magnet choices on eBay including disks with countersunk holes for screw mounting. http://tinyurl.com/ycoxy94d A spring-force gage can be crafted to check the door open calibration. I think I'd encase the mounted magnet in a layer of glass . . . while the risk is low, these things do break and the particles are akin to crushed carbide . . . not something friendly to engines. Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-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/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-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.