AeroElectric-List Digest Archive

Sun 07/31/11


Total Messages Posted: 13



Today's Message Index:
----------------------
 
     1. 07:57 AM - Permanet Splicing RG400 (Jae Chang)
     2. 08:54 AM - FWF Connector (Jared Yates)
     3. 09:02 AM - Re: Permanet Splicing RG400 (Robert L. Nuckolls, III)
     4. 09:09 AM - Re: FWF Connector (Robert L. Nuckolls, III)
     5. 09:11 AM - Re: FWF Connector (RGent1224@aol.com)
     6. 09:16 AM - Diodes (Dennis Ramsey)
     7. 09:19 AM - Re: Permanet Splicing RG400 (rparigoris)
     8. 10:15 AM - Re: Diodes (Robert L. Nuckolls, III)
     9. 10:18 AM - Re: Re: Permanet Splicing RG400 (Robert L. Nuckolls, III)
    10. 10:58 AM - Re: Permanet Splicing RG400 (rparigoris)
    11. 11:03 AM - Re: FWF Connector (Sam Marlow)
    12. 12:59 PM - Re: FWF Connector (Jim Dabney)
    13. 08:57 PM - Re: More FUD (Fear Uncertainty and Doubt)? (Jeff Luckey)
 
 
 


Message 1


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    Time: 07:57:08 AM PST US
    From: Jae Chang <jc-matronics_aeroelectric@jline.com>
    Subject: Permanet Splicing RG400
    I am wondering if there is a way of permanently splicing together 2 sections of coax wire together. I realize I could use a male/female connector. However, i would like to route this cable thru a wing conduit, and the bulky connectors would just get in the way. Thanks for any insights! Jae RV-10


    Message 2


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    Time: 08:54:59 AM PST US
    Subject: FWF Connector
    From: Jared Yates <email@jaredyates.com>
    I'm looking for a connector to use for my cowling-mounted landing light. I'll have to disconnect it every time I remove the cowl, so I'd like to find something fairly durable, with at least 3 conductors. Has anyone found a good product for this role?


    Message 3


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    Time: 09:02:28 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Permanet Splicing RG400
    At 09:51 AM 7/31/2011, you wrote: ><jc-matronics_aeroelectric@jline.com> > > I am wondering if there is a way of permanently splicing together > 2 sections of coax wire together. I realize I could use a > male/female connector. However, i would like to route this cable > thru a wing conduit, and the bulky connectors would just get in the way. This only works well with heat-resistant, modern coax like RG400 or RG142. Slip 2 pieces of 1/2" heat shrink, 4 inches long over ends to be spliced. Strip back 1-1/2" of outer jacket and push braids back to the end of the jackets. Cut center conductors to 1" per side, then strip 1/4" per side. Lap solder center conductors. Wrap exposed joint with Teflon pipe thread tape. It's okay if the tape overlaps the ends of the center conductor insulation and leaves a bit of a 'lump'. Then take braid from one side and pull it over the center conductor splice. Wrap the last 1/2" with a few turns of fine strand wire taken from some airframe wire. Solder wire wrap very thinly to the braid. You're wanting this to get 'fixtured' and 'smooth' without getting 'thick'. Pull the other braid over the fixtured braid and repeat the fine-strand-wire wrap. Then solder the braids to each other. Use 63/37 tin-lead solder. Cover joint with one piece of shrink and heat it. Cover with second piece of shrink and heat that. Yeah, this puts an 'impedance bump' in your feedline that can be observed with the proper test equipment. But if you had identical installations on the airplane except for one pristine feedline and one spliced feedline, you could switch back and forth between them and observe no difference in performance. I used to do this with RG-58 . . . it's pretty tricky due to low melting temperatures of the PVC and PolyE insulations but it CAN be done with practical success. Bob . . .


    Message 4


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    Time: 09:09:44 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: FWF Connector
    At 10:51 AM 7/31/2011, you wrote: > >I'm looking for a connector to use for my cowling-mounted landing >light. I'll have to disconnect it every time I remove the cowl, so >I'd like to find something fairly durable, with at least 3 >conductors. Has anyone found a good product for this role? Cessna started out with Wrist-Locks and/or knife spices in this role, then went to Amp Mate-n-locks. The plastic connectors demonstrated a service life of ten years or better. You could use a d-sub connector and do the pin-paralleling technique described here. http://tinyurl.com/3flxqcc A 15-pin connector with 5 paralleled pins per conductor would achieve some electrical robustness. Bob . . .


    Message 5


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    Time: 09:11:32 AM PST US
    From: RGent1224@aol.com
    Subject: Re: FWF Connector
    How about the three wire trailer light hook up Dick In a message dated 7/31/2011 10:55:44 A.M. Central Daylight Time, email@jaredyates.com writes: --> AeroElectric-List message posted by: Jared Yates <email@jaredyates.com> I'm looking for a connector to use for my cowling-mounted landing light. I'll have to disconnect it every time I remove the cowl, so I'd like to find something fairly durable, with at least 3 conductors. Has anyone found a good product for this role?


    Message 6


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    Time: 09:16:52 AM PST US
    Subject: Diodes
    From: Dennis Ramsey <doramsey@gmail.com>
    Is there a difference in the diode that should be used in a 24 volt contactor vs a 12 volt contactor. My kit provider supplied me with the following Diode specification: "1N4001 Diode; 1 a (Max.) @25C IF; 1. Max.)@25C; 5uAdc(max.)@2" " My plane is 24Volt. Not trying to stir up the 24 vs 12 volt debate. That debate was settled when the kit I bought already had some expensive 24 volt components purchased by the previous builder.


    Message 7


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    Time: 09:19:23 AM PST US
    Subject: Re: Permanet Splicing RG400
    From: "rparigoris" <rparigor@suffolk.lib.ny.us>
    Hi Bob Thx. for your explanation on how to splice coax cable. Question: What is airframe wire? Strands of stainless or plain steel control wire rope (control cable)? Or perhaps you mean thin copper strands of Tefzel wire that is hanging around? "a few turns of fine strand wire taken from some airframe wire" Thx. Ron Parigoris Read this topic online here: http://forums.matronics.com/viewtopic.php?p=348160#348160


    Message 8


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    Time: 10:15:52 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Diodes
    At 11:14 AM 7/31/2011, you wrote: >Is there a difference in the diode that should be used in a 24 volt >contactor vs a 12 volt contactor. My kit provider supplied me with >the following Diode specification: > >"1N4001 Diode; 1 a (Max.) @25C IF; 1. Max.)@25C; 5uAdc(max.)@2" " > > My plane is 24Volt. Not trying to stir up the 24 vs 12 volt > debate. That debate was settled when the kit I bought already had > some expensive 24 volt components purchased by the previous builder. These diodes are EXCEEDINGLY un-critical. ANYTHING 50V or better, 1A or better does the job. My personal favorites are the 1N54xx series, 3A devices. They're readily available at Radio Shack http://www.radioshack.com/product/index.jsp?productId 62578 cheap but most important . . . robust. Heavier 20AWG leads and more robust bodies. But the diodes you have will be fine . . . Bob . . .


    Message 9


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    Time: 10:18:44 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Permanet Splicing RG400
    At 11:16 AM 7/31/2011, you wrote: ><rparigor@suffolk.lib.ny.us> > >Hi Bob > >Thx. for your explanation on how to splice coax cable. > >Question: >What is airframe wire? Strands of stainless or plain steel control >wire rope (control cable)? Or perhaps you mean thin copper strands >of Tefzel wire that is hanging around? Sorry, 'hookup wire' is perhaps a better term. A piece of 22AWG, M22759 will yield some nice strands of 34AWG wire nicely suited to this 'fixturing' task. When you're lap-splicing stranded wire, you can use a strand from the base conductor as shown . . . http://tinyurl.com/dgg2nb But in the coax-splicing task, you need to acquire the fixture strands elsewhere. Bob . . .


    Message 10


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    Time: 10:58:07 AM PST US
    Subject: Re: Permanet Splicing RG400
    From: "rparigoris" <rparigor@suffolk.lib.ny.us>
    Hi Bob Thx. for the reply. Ron Parigoris Do not archive. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=348169#348169


    Message 11


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    Time: 11:03:24 AM PST US
    From: Sam Marlow <sam.marlow@roadrunner.com>
    Subject: Re: FWF Connector
    Jared Yates wrote: > --> AeroElectric-List message posted by: Jared Yates<email@jaredyates.com> > > I'm looking for a connector to use for my cowling-mounted landing light. I'll have to disconnect it every time I remove the cowl, so I'd like to find something fairly durable, with at least 3 conductors. Has anyone found a good product for this role? > > Cessna uses 2 knife splices on the older 172's.


    Message 12


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    Time: 12:59:54 PM PST US
    From: Jim Dabney <jdabney@rice.edu>
    Subject: Re: FWF Connector
    I'm using a Metripack connector for that and it's holding up well. On 7/31/2011 1:00 PM, Sam Marlow wrote: > <sam.marlow@roadrunner.com> > > Jared Yates wrote: >> --> AeroElectric-List message posted by: Jared >> Yates<email@jaredyates.com> >> >> I'm looking for a connector to use for my cowling-mounted landing >> light. I'll have to disconnect it every time I remove the cowl, so >> I'd like to find something fairly durable, with at least 3 >> conductors. Has anyone found a good product for this role? >> >> >> >> >> >> >> >> > Cessna uses 2 knife splices on the older 172's. > >


    Message 13


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    Time: 08:57:32 PM PST US
    From: "Jeff Luckey" <JLuckey@pacbell.net>
    Subject: More FUD (Fear Uncertainty and Doubt)?
    I've been fascinated w/ the VP product line since it came out. As an electrical engineer I think it is a really cool way to skin the Power Distribution cat but no matter how cool, I still don't want one in my airplane. It seems like there is a lot of complexity involved to accomplish a relatively simple mission - safe & reliable power distribution & control - something we've been doing for decades w/ relatively inexpensive & proven components. I'm all for trying to apply new technologies to solving old problems, but it's not easy, and sometimes the old way is hard to beat. It looks kind of like a solution looking for a problem and it seems to put all of your electrical eggs in one basket. Like Bob says, if the system gets sick, it must come out - thus grounding (electrical pun intended;) your airplane - while the system travels back and forth to the factory for repair. I think that you probably get a lot of bang but you also put up a lot of bucks - I just don't see the value - but then again I'm capable of designing & building my own system. Someone without that skill set may see it differently. I would like to hear from someone who is knowledgeable about VP's features/benefits discuss why they think those system are better, stronger, faster. I might learn something. -Jeff _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Saturday, July 30, 2011 22:50 Subject: Re: AeroElectric-List: More FUD (Fear Uncertainty and Doubt)? At 08:48 PM 7/30/2011, you wrote: Bob, a number of manufacturers state in their installation manuals (Garmin - GTN 650, PS Engineering - PS9000EX) that the use of push-pull circuit breakers is required, and that the breakers "be readily accessible to the pilot." Based on your recommendation I intend to use fuses, for simplicity and cost. What's your view on the matter? I'm reluctant to go against a manufacturer's recommendation/requirement, but don't want to do it blindly either. Black box designers are not systems designers. Further, their products are generally tested to meet performance and environmental specifications that are never called upon to 'test the efficacy of protection for power feeders.' In other words, it's none of their business. If their devices were being installed in an airplane fitted with a VP system . . . or an airplane like the Eclipse, there are no pullable breakers. Do these same folks insist on an Avionics Master Switch? Bottom line is that the authors of their installation manuals are more lawyer than engineer. As long as I'm asking, what's your view on the VPX-PRO? I was initially attracted to it, but thought better of it for a number of reasons (much higher cost than fuses, support issues if Vertical Power goes away, electronic interface to reset an ECB (i.e. complexity?), single power bus, etc.). Plus, I'n not sure if the added benefits of their systems exceed the negatives. I'd be interested in your opinion. What is your return on investment? Lighter airplane, faster airplane, lower fuel consumption? Yes, lots of nice nic-nacs but are you a PILOT or someone who would rather just be along for a nice ride? If you have a fuse/breaker/switch system, you know where every part comes from and what spares will cost you for repairs. If the VP system gets a cold, your airplane is down while the factory repairs it. It uses software you didn't write, parts you didn't buy and couldn't replace even if you had them . . . 'cause you don't understand it. I just don't see that the VP products are in synchronization for why we choose to built our own airplanes as opposed to paying factory prices. Certainly cost/performance ratio is a strong driver and I don't see how a VP product fits that recipe for success. Bob . . .




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