---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 11/27/13: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:28 AM - Make Sure You're Listed! List of Contributors Coming Soon! (Matt Dralle) 1. 06:31 AM - Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (user9253) 2. 06:42 AM - Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (user9253) 3. 09:25 AM - Re: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) (Robert L. Nuckolls, III) 4. 09:27 AM - Re: Re: Garmin G3X Autopliot Auto Trim with Big Trim Motor (Robert L. Nuckolls, III) ________________________________ Message 0 _____________________________________ Time: 12:28:37 AM PST US From: Matt Dralle Subject: AeroElectric-List: Make Sure You're Listed! List of Contributors Coming Soon! Dear Listers, There's just a few more days left in this year's List Fund Raiser and that means the List of Contributors (LOC) is just around the corner! In December I post a list of everyone that so generously made a Contribution to support the Lists. Its my way of publicly thanking everyone that took a minute to show their appreciation for the Lists. Won't you take minute and assure that your name is on the upcoming LOC? Tell others that you appreciate the Lists. Making a Contribution to support the Lists is fast and easy using your Visa, MasterCard, or Paypal account: http://www.matronics.com/contribution Or, drop a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 I would like to thank everyone that has so generously made a Contribution thus far during this year's List Fund Raiser! Remember that its YOUR support that keeps these Lists running and improving! Don't forget to include a little comment about how the Lists have helped you! Thank you! Matt Dralle Matronics Email List Administrator ________________________________ Message 1 _____________________________________ Time: 06:31:38 AM PST US Subject: AeroElectric-List: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) From: "user9253" Sacha, The output of the dynamo goes through a 5 amp circuit breaker which is too small for a 20 amp dynamo. The 25 amp main circuit breaker is a single point of failure. When it opens, everything electrical stops working. To fix the above two problems, use the 25 amp circuit breaker for the dynamo circuit. Do not install any main circuit breaker. The pilot can shut off the master relay in case of smoke in the cockpit. The 20 amp avionics circuit breaker is another single point of failure. Replace it with a wire. I see no reason to have the starter switch on the control stick unless the pilot intends to make frequent engine starts while flying. It is only a matter of time before the start button is accidentally pushed when the engine is already running. If anyone disagrees with the above, please speak up. It will not hurt my feelings and I want Sacha to have good advice. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=414324#414324 ________________________________ Message 2 _____________________________________ Time: 06:42:24 AM PST US Subject: AeroElectric-List: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) From: "user9253" Sacha, I was looking at the wrong schematic, Kitfox Diagram 0.6.pdf, my mistake. I should have been looking at Kitfox_Proposed_Diagram_1.23.pdf. Even so, the dynamo output is still going though a 5 amp breaker. And the start switch is still on the control stick. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=414327#414327 ________________________________ Message 3 _____________________________________ Time: 09:25:50 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: kitfox /rotax 912 wiring diagram (variation on Z-16) At 08:41 AM 11/27/2013, you wrote: Sacha, I was looking at the wrong schematic, Kitfox Diagram 0.6.pdf, my mistake. I should have been looking at Kitfox_Proposed_Diagram_1.23.pdf. Even so, the dynamo output is still going though a 5 amp breaker. And the start switch is still on the control stick. Joe Joe offers some salient observations. I'm pleased that you've taken a run at the AutoCAD flavored gauntlet! As you evolve your plan for this airplane, consider refining your drawings to be less like schematics and more like wiring diagrams. If you study the drawings I've posted you will discover that they look more like the sketch on the left where the END of each wire, i.e. the location of each termination is defined both electrically and physically. Schematics are entirely suited to describing how a thing works but its a good idea to include information on just how it all goes together too. Emacs! Additional points of interest from your draft: The battery bus is generally located very close to the battery contactor. Feeder from the battery to battery bus is short and no protection is necessary. Your e-bus loads include a lot of stuff that seems to go beyond the needs for en route, battery only endurance. In other words, what is the minimalist suite of electro-whizzies needed to navigate to a point of destination airport in sight. After that, your arrival in one piece is assured . . . you can close the battery contactor and tax what ever energy remains in the battery without adding to your risks. Consider re-assigning supply points for some of the items on the avionics bus. The breaker in the alternator b-lead can be replaced with an in-line, fuse holder . . . Emacs! and 30A fuse. The b-lead fuse can then be located right next to the battery's connection with the battery contactor. The 5A "alternator breaker" is actually a CONTROL breaker included to accommodate the crowbar OV protection system. Not sure stick-grip starter buttons are a good idea . . . but if you do incorporate them into the system, make sure your starter contactor coil currents are not overly antagonistic to the switches. As I outlined in my essay on two-stage, starter-mounted solenoids, the pull-in currents carried buy the starter button are pretty scary . . . hence the advice for a stand-alone, automotive starter contactor with MUCH more benign current draws . . . but even these are on the order of 5A . . . and should probably be wired with 20AWG wire to insure strong pull-in. Contactors are most abused by soggy pull-in current. More contactors have been burned up by nearly dead batteries than by healthy, fully charged batteries. Recommend you use panel mounted, robust button only and wire with 20AWG wire from a protected feeder . . . you don't show a 'starter' breaker or fuse. Looks like a great starting point . . . let's continue to discuss its refinement. Bob . . . ________________________________ Message 4 _____________________________________ Time: 09:27:12 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Garmin G3X Autopliot Auto Trim with Big Trim Motor At 10:44 PM 11/26/2013, you wrote: > Sure. Will this project include a wheel-master disconnect switch? 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