---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 07/11/14: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:27 AM - Re: RV-7 wireing questions (user9253) 2. 08:58 AM - Re: Re: RV-7 wireing questions (Ken) 3. 10:10 AM - Re: Re: Aeronautical idiosyncrasies (Ed) 4. 01:17 PM - Re: Re: RV-7 wireing questions (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 08:27:10 AM PST US Subject: AeroElectric-List: Re: RV-7 wireing questions From: "user9253" Z-11 is a good choice. An avionics switch is not recommended because if it fails, all of the avionics stop working. And any switch will eventually fail. I would question the qualifications of anyone who warns about damaging voltage spikes during engine start. Have they written a book on aircraft wiring? Dynon states in their Pilots User Guide for both the D-180 and SkyView that it is OK to have their units powered on during engine start. The real problem during engine cranking is not voltage spikes, but rather voltage slump, aka brownout. That is an annoyance, not a danger to avionics. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=426498#426498 ________________________________ Message 2 _____________________________________ Time: 08:58:19 AM PST US From: Ken Subject: Re: AeroElectric-List: Re: RV-7 wireing questions About once every 50 engine starts my Gemini ADI (glass stand alone ADI) will freeze up. The only indication of that before takeoff is that the gps heading does not change during taxi. For aircraft without brown out protection, it might be convenient to have a switch of some kind, or an accessible circuit breaker, to reboot any devices that don't have their own on-off switch. Sure the battery master will also do it but I choose not to test the load dump capability of my internally regulated alternator, or my PM alternator, by deliberately cycling the master with a running engine. My John Deer PM regulator does not like load dumps. Ken On 11/07/2014 11:24 AM, user9253 wrote: > > > Z-11 is a good choice. An avionics switch is not recommended because > if it fails, all of the avionics stop working. And any switch will > eventually fail. I would question the qualifications of anyone who > warns about damaging voltage spikes during engine start. Have they > written a book on aircraft wiring? Dynon states in their Pilots User > Guide for both the D-180 and SkyView that it is OK to have their > units powered on during engine start. The real problem during engine > cranking is not voltage spikes, but rather voltage slump, aka > brownout. That is an annoyance, not a danger to avionics. Joe > > -------- Joe Gores > > ________________________________ Message 3 _____________________________________ Time: 10:10:02 AM PST US From: Ed Subject: Re: AeroElectric-List: Re: Aeronautical idiosyncrasies I recently inspected an RV-6A with a vertical engine control setup running from panel to fuel selector. This is per plans, though many have dispensed with it and arranged their controls horizontally along the bottom of the panel. This one had throttle at the top and mixture at the bottom with carb heat in between. I noticed the non-standard setup and it still got me. I did a run up and the engine quit when I thought I was actuating carb heat. I'm sure it never happens to the owner because he's used to it. A new owner would have to be wary until he got used to it. I was once working on a one-off motorglider that had yet to fly and found throttle, prop, and mixture all rigged backwards. People don't always put a lot of thought into what they do. Best to be wary in a new to you experimental. Remember the non-standard placement of fuel selector (along with poor condition of same) that contributed to John Denver's demise. Ed Holyoke On 7/8/2014 12:48 AM, GLEN MATEJCEK wrote: > > > >Re: > > > >=C2 =C2 Yes, attention has been paid to human factors > >=C2 =C2 in cockpit design and layout since day-one . . . > > > >Just as a curious data point, in the WWII plane > >I fly on the side throttles forward is more > >power, props forward is more power, blowers > >forward is more power, mixtures forward is > >suddenly silent. =C2 Every departure requires a > >quiet moment reviewing the several gotchas in > >the cockpit lest reflex cause a debacle. > > Interesting! I've never encountered a 'variance' > with so much perceived significance and > potential risk. > > Which airplane? > > > Bob . . > > Lockheed PV-2 Harpoon. There are other issues, as well... Alternate > air forward is hot, and the landing gear and flap levers are > identical and symmetrically located. Keeps you on your toes! > > * > > > * > ________________________________ Message 4 _____________________________________ Time: 01:17:33 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: RV-7 wireing questions At 10:58 AM 7/11/2014, you wrote: > >About once every 50 engine starts my Gemini ADI (glass stand alone >ADI) will freeze up. The only indication of that before takeoff is >that the gps heading does not change during taxi. For aircraft >without brown out protection, it might be convenient to have a >switch of some kind, or an accessible circuit breaker, to reboot any >devices that don't have their own on-off switch. The Gemini ADI installation manual does speak to an ADI Master Switch downstream of a 1A breaker. This is a very low power consumption device! How a bout a miniature, normally closed push button next to the instrument in series with the power input that would allow you to do a 'hard' reset? >Sure the battery master will also do it but I choose not to test the >load dump capability of my internally regulated alternator, or my PM >alternator, by deliberately cycling the master with a running >engine. My John Deer PM regulator does not like load dumps. >Ken Don't you have positive alternator control? For a PM alternator, a set of relay contacts in series with the AC output winding will offer a way to shut it off without undue stress. 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