AeroElectric-List Digest Archive

Sun 03/13/11


Total Messages Posted: 8



Today's Message Index:
----------------------
 
     1. 03:03 AM - Re: latching relays (Jan de Jong)
     2. 03:30 AM - Re: remote battery charging (John Ciolino)
     3. 05:01 AM - Re: remote battery charging (Richard Reynolds)
     4. 07:29 AM - Re: latching relays (user9253)
     5. 07:37 AM - Re: remote battery charging (Bill Watson)
     6. 08:13 AM - Re: remote battery charging (user9253)
     7. 08:56 AM - Re: latching relays (Robert L. Nuckolls, III)
     8. 08:46 PM - Remote Angle of Attack Indicator (Vern Little)
 
 
 


Message 1


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    Time: 03:03:12 AM PST US
    From: Jan de Jong <jan_de_jong@casema.nl>
    Subject: Re: latching relays
    May I offer a thought in support of latching relays. How likely is it that the fault that causes smoke in the cockpit coincides with the failure of the relay to open? Wouldn't they be generally independent failures? I do agree that if you have plenty of amps it is hard to find a compelling reason to use them. On the other hand - Tyco must see a market for automotive power saving. For the minimalist system with PM alternator I think the notion of using latching relays can be played with. Jan de Jong


    Message 2


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    Time: 03:30:03 AM PST US
    From: "John Ciolino" <johnciolino@comcast.net>
    Subject: remote battery charging
    Take a look at www.powerlet.com. They make receptacles for charging motorcycle batteries which could be adapted. Especially if, as Bob suggests, you mount them inside the cockpit. I don't think there are any 3 wire receptacles so you will have to use one for each battery or split the power feed. The nice thing is that you can get a receptacle with the 2 prong SAE connector that will plug into the harness from most battery tender type chargers. John Ciolino RV-8 N894Y From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Saturday, March 12, 2011 10:45 PM Subject: Re: AeroElectric-List: remote battery charging Dual batteries will be located in the aft fuselage for W & B issues...I want to be able to recharge the batteries by installing a (more or less) flush, weatherproof receptacle and plug in the side of the FG fuselage, one which would replace the alligator clips on the charger. I believe I erred in buying a "Piper type socket" and "Piper type plug" (Acft. Spruce p/n 11-00500 and p/n 11042) thinking they would serve, but have concluded that their purpose is for "jump starting" rather than battery recharging. (If this is in fact so, they'll be returned.) Soooooo...can anyone suggest a brand/type/model receptacle - plug combination suitable for battery charging? You CAN charge batteries through such connectors . . . as well as crank engines if that need arises. It depends on how you wire the connector to your airplane. If you have dual batteries, then getting the pair of batteries connected together for charging purposes poses a problem for needing to have contactors closed. So if the goal is battery charging/maintenance only, then about anything is fine. Take a look at trailer lighting connectors like . .. Emacs! Walmart automotive has some like this. You need three or more pins. One for ground and one to each battery through an inline fuse (can be a fuse on the battery bus). If you don't need to lock the canopy closed during charging ops, consider mounting the jack inside the airplane so you don't need to poke a hole in the skin. If the socket is inside, remove the spring loaded "lid". It's not needed and only gets in the way. I'm now looking at using (2) Odyssey #545s (14AH each) for a total weight of 23.4 pounds. I see that B & C lists a slightly more powerful (16AH) battery, a BC116-1 w/ weight of 14.6 pounds (each). I can't seem to find any performance specs . . . If you're doing the yearly change-out of the oldest battery, absolute performance is not significant. The two batteries in parallel (on less than two years old, the other less than one year old) are going to crank your engine just fine. Buy the cheapest batteries you can find that have connections which support cranking currents. Bob . . .


    Message 3


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    Time: 05:01:05 AM PST US
    Subject: Re: remote battery charging
    From: Richard Reynolds <richardreynolds@cox.net>
    Fred, In the aviation electrical section at West Marine, look for: Marinco ConnectPro Trolling Motor Plug and Receptacle, model 1422591, $45. It is small, light and heavy duty. I put mine under the plane. I do not "jump start" the plane from this connection, but sometimes there is a heavy current 10-15 A when recharging a dead battery after the master switch has been left on. I used Bob's Z-31 design to protect the battery from reverse polarity and 24 V. Richard Reynolds Norfolk VA RV-6A - N841RV


    Message 4


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    Time: 07:29:45 AM PST US
    Subject: Re: latching relays
    From: "user9253" <fran4sew@banyanol.com>
    Another option for using a conventional master contactor is to energize it at full voltage, then hold it at reduced voltage. I believe that Bob was working on a microprocessor based device that would do that. One could also make their own reduced voltage holding circuit using a resistor or diodes to drop the voltage along with a 3-position master switch: off, low voltage, and normal voltage. Or how about this IC along with a Power MOSFET? http://ww1.microchip.com/downloads/en/DeviceDoc/21448c.pdf I was going to use this IC to control the elevator trim servo. I think it would also work with the master contactor. It applies full voltage for a timed interval, then puts out a PWM voltage, for a price of $1.38. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=333732#333732


    Message 5


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    Time: 07:37:00 AM PST US
    From: Bill Watson <Mauledriver@nc.rr.com>
    Subject: Re: remote battery charging
    On 3/12/2011 10:45 PM, Robert L. Nuckolls, III wrote: > If you don't need to lock > the canopy closed during charging ops, consider > mounting the jack inside the airplane so you don't > need to poke a hole in the skin. If the socket is > inside, remove the spring loaded "lid". It's not > needed and only gets in the way > > Bob . . . > I took this approach on my not-yet-flying RV10 with dual Odysseys. Used these "XLR" connectors: http://www.radioshack.com/product/index.jsp?productId=2104076# http://www.radioshack.com/product/index.jsp?productId=2103444&CAWELAID=107593419 With dual batteries and scheduled swap outs, I'm thinking charging should never become a regular or normal procedure. Therefore, no holes in the skin. I mounted the XLR connector on the rear baggage bulkhead, inches from the batts, and bypassed the contactors with inline fuses. The baggage door has to be opened to access the jack. My charger came with an inline plug so I can attach the regular alligator clamps or the XLR plug. Thanks Bob and the List for guiding me on this. Bill "all I talk about these days is paint" Watson


    Message 6


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    Time: 08:13:39 AM PST US
    Subject: Re: remote battery charging
    From: "user9253" <fran4sew@banyanol.com>
    If you have a cigarette type power outlet in the cockpit, you can use one of these chargers for sale on eBay: https://lh6.googleusercontent.com/_9Rmupq9lpCs/TXzXScNgc-I/AAAAAAAAAKk/uPU9_yO6qpM/Charger.png WalMart sells a similar charger http://www.walmart.com/ip/Schumacher-SpeedCharge-Battery-Maintainer-and-Charger/13005742 but you will have to buy a separate cigarette lighter plug. Or you can put flush mounted anchor nuts or nutplates on the outside of the fuselage and use the ring terminals that come with the charger along with some screws. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=333736#333736


    Message 7


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    Time: 08:56:53 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: latching relays
    At 05:59 AM 3/13/2011, you wrote: May I offer a thought in support of latching relays. How likely is it that the fault that causes smoke in the cockpit coincides with the failure of the relay to open? Wouldn't they be generally independent failures? Very low risk. I do agree that if you have plenty of amps it is hard to find a compelling reason to use them. On the other hand - Tyco must see a market for automotive power saving. I suspect that 'power saving' is way down on the list of design goals. Increased longevity due to low values of internally generated heat might be a big driver. The mechanically latched device is not going to aggravate the effects of a transient event. It wouldn't drop out and re-close during a severe brown-out . . . and the folks who brought these to market may not have considered either . . . For the minimalist system with PM alternator I think the notion of using latching relays can be played with. Absolutely. I should remind readers that my background calls for sifting the sands of risk for the purposes of keeping folks-who-know- more-about-airplanes-than-we-do happy. I'm not implying that regulatory mandates do not mesh well with elegant solutions. But they DO tend to discourage new solutions from emerging and evolving. Let's do our own sand-sifting. Bob . . .


    Message 8


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    Time: 08:46:17 PM PST US
    From: "Vern Little" <sprocket@vx-aviation.com>
    Subject: Remote Angle of Attack Indicator
    A few months ago, there was a lot of discussion on providing remote (glareshield) mounted AoA indicators. Vx Aviation had developed such a unit in 2006, but discontinued it after a few years due to lack of demand and high support costs. Things have changed. It looks like the average pilot appreciates AoA a lot more than they did 5 years ago. In addition, the original unit, which was only compatible with Dynon D10A/D100/D120 systems is also now supported by GRT Avionics, and both MGL and Garmin are looking into supporting it as well. Due to the customer demand and the support from the OEM's, I've reconsidered reintroducing the V-Speed ADS Remote AoA indicator. More information is available here: www.vx-aviation.com. If anyone is interested in this product, please contact me to put on the notification list. Alternatively, you can order right off of the website, however, we won't be shipping for a few weeks yet. Thanks, Vern Little Vx Aviation




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