---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 02/10/17: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:55 AM - Flap control suggestions (GTH) 2. 07:52 AM - Re: Flap control suggestions (user9253) 3. 04:18 PM - Re: Why is this diode there ? (Robert L. Nuckolls, III) 4. 05:29 PM - Re: Flap control suggestions (Robert L. Nuckolls, III) 5. 08:09 PM - Z12 Question (don van santen) ________________________________ Message 1 _____________________________________ Time: 12:55:01 AM PST US From: GTH Subject: AeroElectric-List: Flap control suggestions Hi all, What would be your suggestion for a landing flap control box, module etc. ? My partners would prefer a system with a three or four positions lever/toggle directly commanding the flap position, like "retracted", "takeoff", "land" etc. Any ideas about a supplier, any feedback ? Thanks in advance, -- Best regards, Gilles http://contrails.free.fr http://lapierre.skunkworks.free.fr ________________________________ Message 2 _____________________________________ Time: 07:52:07 AM PST US Subject: AeroElectric-List: Re: Flap control suggestions From: "user9253" ELECTRONIC FLAP ACTUATOR / INDICATOR from Aircraft Spruce http://www.aircraftspruce.com/catalog/elpages/electronicsflapcontroller.php -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=465974#465974 ________________________________ Message 3 _____________________________________ Time: 04:18:23 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Why is this diode there ? At 08:20 PM 2/8/2017, you wrote: >Okay the original diagram was from a maintenance manual, here's one >from the POH > >I think the big diode in the B line is used to limit / protect the >alternator line (aka no circuit breaker) but now what the heck is >the power relay circuit at the bottom ??? > >And the diode is still in the ground power, Maybe to protect from >reverse polarity ?? Not that one . . . the diode and resistor in series around the open battery contactor is indeed part of the ground power kit. It is intended to supply a small 'charge path' for a dead battery after the bus comes up under ground power. If the battery is too weak to close the contactor, this sneak-path will bring the battery's open terminal voltage up enough to close the contactor so that the battery can be charged by ground power. The first POH drawing depicted the single-terminal ground power connector popular on Piper models (and others). The drawing I posted was typical of Cessna POH. It depicts the legacy military style ground power connector. Emacs! Note that this drawing also features a 'sneak path' diode around the battery contactor. Another diode is shown in series with the ground power contactor coil. This is repeated in the drawing on my website: http://tinyurl.com/gtqp6tk Note that this drawing does not include the sneak-path diode. This is because I recommend applying ground power directly to the battery allowing it to be charged without powering up the whole aircraft. Bob . . . ________________________________ Message 4 _____________________________________ Time: 05:29:42 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Flap control suggestions At 02:51 AM 2/10/2017, you wrote: > >Hi all, > >What would be your suggestion for a landing flap control box, module etc. ? How about a spring loaded, (retract)-OFF-(extend) switch? The only time flap position indicator were required was on aircraft where the airplane might become unmanageable if flaps were extended too far for some flight condition -AND- the flaps could not be directly observed by the pilot. I can't ever recall using a flaps position indicator to drive flaps to a 'precise' position during any phase a flight. A few dozen approach/landing cycles would pretty well calibrate the stick-feel for positioning flaps without bringing your eyes inside the cockpit -or- visually confirming the flap position. Some models of Cessna were fitted with flaps that could be extended to 40 degrees. There WERE situations where the airplane would not sustain level flight with fully extended flaps and we were taught to make a final approach at 30 and not to go all the way until you were committed to land. A A/D against those airplanes restricted flap travel to 30 degrees after too many pilots got into a bind with too aggressive application of flaps. But those are RARE and if your project is at risk for such a condition, the kit manufacturer and/or owners of said aircraft will certainly know about it. Aside from those rare designs, the simple toggle switch teamed with limit switches and perhaps some robust SPDT relays is cheap, simple, and very low risk for un-intended motion of flaps. I'm certain that you'll discover that a flap position indicator is among the least useful displays on the panel. http://tinyurl.com/nhftedq Bob . . . ________________________________ Message 5 _____________________________________ Time: 08:09:24 PM PST US From: don van santen Subject: AeroElectric-List: Z12 Question I am considering converting my Z18-8 equipped RV to a Z12 format. The B&C install kit includes an ANL mount and "fuse" plus the current sensor. My question is, is it reasonable to connect my existing anl with its 80 amp fuse and the anl from the stand by source to a single load meter shunt with the output side connected to the cold side of the starter contactor? Except for the addition of the second ANL and the B leed from the standby there are no other changes to this part of my proposed system. My reason for asking is that it will be difficult to add an additional load meter to my panel. I am thinking that the stand buy would only be generating when the main alternator is offline for what ever reason. The meter reads out XX.X amps and is built into my EFIS. The EFIS has a connection for a hall effect amp sensor but that would require two firewall penetrations from the standby alternator B leed. I am not sure that I have given enough information to answer my question, but I would appreciate any input. 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