AeroElectric-List Digest Archive

Wed 07/03/13


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     1. 04:43 AM - Re: Re: Good deal on handy bench supply ()
     2. 08:26 AM - Re: Boeing switches (Robert L. Nuckolls, III)
     3. 10:48 AM - Re: Boeing switches (woxofswa)
     4. 12:34 PM - Re: Re: Master Switch/Contactor and Starter Questions (Ken)
     5. 05:14 PM - Re: Master Switch/Contactor and Starter Questions (dgaldrich)
 
 
 


Message 1


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    Time: 04:43:16 AM PST US
    From: <rd2@dejazzd.com>
    Subject: Re: Good deal on handy bench supply
    Thanks Bob, I just sent them an email. do not archive ---- nuckollsr <bob.nuckolls@aeroelectric.com> wrote: ============ Given the generally upstanding nature of eBay merchants and buyers, it's unlikely that the power supply you bought is faulty. Here's Mastech's page on that model http://tinyurl.com/lqh7hea At the bottom you'll find an e-mail link. Drop them a line, tell them what model of power supply you have and that you want a copy of the user's manual. I think they'll tell you were to download it . . . or attach it directly to their reply. Bob . . . Read this topic online here: http://forums.matronics.com/viewtopic.php?p=403837#403837


    Message 2


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    Time: 08:26:59 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Boeing switches
    At 10:11 PM 7/2/2013, you wrote: > >Myron, > >After looking at this a little more, I have to agree with Peter. I >was definitely over-thinking it! > >The "both switches must be closed" logic is internal to the >module. They simply have the two thumb switches wired in series. > >Peter's advice below should work. > >Eric > The split trim switch and the recommended wiring is a prophylactic against trim runaway caused by failure of a single switch - i.e. both switches CAN be operated as a single switch for normal operations but BOTH switches have to fail to produce a runaway condition. This technique has been used on a host of electric trim systems. Further the switches can be operated independently of each other for pre-flight check of integrity for the opposite switch. Wiring as recommended honors the legacy failure mode effects analysis which I've discussed in detail here. http://tinyurl.com/lpvth8d Bob . . .


    Message 3


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    Time: 10:48:36 AM PST US
    Subject: Re: Boeing switches
    From: "woxofswa" <woxof@aol.com>
    Thanks for the input. I'll try the suggested method. The Safety Trim gives runaway protection so I'm not so concerned about maintaining that from the switch itself. I haven't delved into the PTT or A/P disco yet, but hopefully those should interface easily. -------- Myron Nelson Mesa, AZ Emp completed, QB wings completed, legacy build fuse on gear. FWF complete. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=403873#403873


    Message 4


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    Time: 12:34:09 PM PST US
    From: Ken <klehman@albedo.net>
    Subject: Re: Master Switch/Contactor and Starter Questions
    That is what I did. Not zero risk but not something I worry about. We always check for normal charging voltage after start and before takeoff which should catch a failed on starter solenoid. I think it is likely that turning off the battery contactor would stop a stuck on on starter at least one time but I've never tested that. I've seen a lot of grief when conversions try to "improve" something over the tried and true method used in thousands of automobiles. The subaru starter was not designed to run with an external starter contactor. If you add the additonal starter contactor, how often would you test it for having failed closed anyway. I like simple and I like most modern automotive technology - well up to a couple of years ago anyway... Ken >> The Corvair uses a Subaru starter which has an almost zero weld closed >> failure rate so I'm still thinking of running a large wire from the >> battery contactor to the big lug on the starter and using the starter >> solenoid as an independent way to turn the engine over. Two less >> junctions in the high current path. >


    Message 5


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    Time: 05:14:31 PM PST US
    Subject: Re: Master Switch/Contactor and Starter Questions
    From: "dgaldrich" <dgaldrich@embarqmail.com>
    I agree. It seems pointless to have 2 solenoids operating at the same time. The other issue is that I believe the Subaru solenoid moves the gear before the contactor part puts juice to the motor brushes. An aircraft type contactor would do both at the same time rather than sequentially. Have not dismantled one so I may be in error. Dave Read this topic online here: http://forums.matronics.com/viewtopic.php?p=403903#403903




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