---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 10/23/10: 9 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:26 AM - 9024 status? (jonlaury) 2. 10:09 AM - Right Angle BNC Fittings (MLWynn@aol.com) 3. 10:21 AM - Re: Re: AUX Battery (Robert L. Nuckolls, III) 4. 11:06 AM - Re: Right Angle BNC Fittings (Jim Dabney) 5. 11:33 AM - Re: Right Angle BNC Fittings (Allen Fulmer) 6. 06:40 PM - Re: Ground Power / Tiedown Power Cart (Noel Loveys) 7. 09:52 PM - Re: Ground Power / Tiedown Power Cart (Robert L. Nuckolls, III) 8. 10:24 PM - Re: Ground Power / Tiedown Power Cart (rayj) 9. 11:05 PM - Re: Ground Power / Tiedown Power Cart (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 09:26:50 AM PST US Subject: AeroElectric-List: 9024 status? From: "jonlaury" Bob, Any word on when the 9024 module will be available? I'm a couple of weeks from engine start and I've planned on 9024 OVP for the stby alt and ground power jack. Thanks, JOhn Read this topic online here: http://forums.matronics.com/viewtopic.php?p=316765#316765 ________________________________ Message 2 _____________________________________ Time: 10:09:52 AM PST US From: MLWynn@aol.com Subject: AeroElectric-List: Right Angle BNC Fittings Hi all, I am wiring in my com and transponder antennae. The wiring would be a little more elegant with a right angle connector on the antenna. B&C markets a right angle fitting: _http://www.bandc.biz/bncrightangleadapter.aspx_ (http://www.bandc.biz/bncrightangleadapter.aspx) That runs about six bucks. Aircraft Spruce has a right angle fitting _http://www.aircraftspruce.com/catalog/elpages/bncrfconnector.php_ (http://www.aircraftspruce.com/catalog/elpages/bncrfconnector.php) that runs about $46. The question is, is there a significant dB loss using B&C's right angle adaptor as opposed to the right angle fitting from ACS? Thanks Michael Wynn RV 8 Finishing San Ramon, CA ________________________________ Message 3 _____________________________________ Time: 10:21:01 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: AUX Battery What's the capacity of your aux battery? At 06:08 PM 10/22/2010, you wrote: AeroElectric-List message posted by: tim2542@sbcglobal.net 7ah Tim Okay, it's not one of those "tiny" things and will probably be okay with the simple diode in the charging feeder. CAUTION Any builders on the List who are relatively new or perhaps were not paying close attention to battery discussions in past years, I advise a review of the following publications: Chapters 2 and 17 of the AeroElectric Connection http://www.aeroelectric.com/articles/neveragain/neveragain.html http://www.aeroelectric.com/articles/neveragain/neveragain_1.html http://www.aeroelectric.com/articles/neveragain/neveragain_2.html http://www.aeroelectric.com/articles/battery.pdf http://www.aeroelectric.com/articles/rg_bat.html http://www.aeroelectric.com/articles/Batteries/Multiple_Battery_Myths_A.pdf http://www.aeroelectric.com/articles/bat_iso2.pdf http://www.aeroelectric.com/articles/Batteries/Deltran_Odyssey_Floobydust.html http://www.aeroelectric.com/articles/WestMountain_CBAII.pdf Bottom line is that if you are carrying ANY number of battery(ies) on board for the purpose of alternator failure mitigation, then you need to SIZE the task - how much time to do you EXPECT any battery to perform as back-up power? Then you need A PLAN to make sure those requirements will be met. This is especially important for so-called AUX batteries that are not NORMALLY expected to do anything. If the battery doesn't crank the engine . . . nor is it occasionally used to supply some noteworthy run-time for ground maintenance, then HOW DO YOU KNOW the thing is even useful? The heavy iron guys periodically capacity test all ship's batteries and replace them when they fall below established limits for meeting s/b power needs. With out A PLAN, it's a high order risk that the battery won't be there for you at such time you DO need it. If no plan, then depending on an AUX battery (or even the ship's main battery) to bail you out is problematic. You're may be investing $acquisition$, space, weight and fuel to wrap yourself in a lead-acid security blanket. Cap meters like . . . http://www.westmountainradio.com/content.php?page=cba are excellent pieces of test equipment that will load the battery exactly like you'll expect to load it during S/B service in your airplane. If not this class of device, then http://www.aeroelectric.com/articles/Poor_Man%27s_Cap_Tester.pdf or just put a new battery in every two years. But have requirements assured by a plan. Bob . . . ________________________________ Message 4 _____________________________________ Time: 11:06:52 AM PST US From: Jim Dabney Subject: Re: AeroElectric-List: Right Angle BNC Fittings Michael, I've had good results with the right angle connectors from Stein: http://www.steinair.com/connectors.htm Jim Dabney On 10/23/2010 12:06 PM, MLWynn@aol.com wrote: > Hi all, > I am wiring in my com and transponder antennae. The wiring would be a > little more elegant with a right angle connector on the antenna. B&C > markets a right angle fitting: > http://www.bandc.biz/bncrightangleadapter.aspx > That runs about six bucks. Aircraft Spruce has a right angle fitting > http://www.aircraftspruce.com/catalog/elpages/bncrfconnector.php > that runs about $46. > The question is, is there a significant dB loss using B&C's right > angle adaptor as opposed to the right angle fitting from ACS? > Thanks > > Michael Wynn > RV 8 Finishing > San Ramon, CA > * > > > * ________________________________ Message 5 _____________________________________ Time: 11:33:41 AM PST US From: "Allen Fulmer" Subject: RE: AeroElectric-List: Right Angle BNC Fittings I "split the difference" with SteinAir for $17.50: "3 Piece 90 Degree Right Angle Male BNC Crimp Connector for RG-400 & RG-58 Coax Cable. Uses the same crimper as standard BNC's." Note that it is a crimp connector whereas B&C's is female to male right angle. You will have one extra BNC connector to complete the connection. Allen Fulmer RV7 Cowling From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of MLWynn@aol.com Sent: Saturday, October 23, 2010 12:06 PM Subject: AeroElectric-List: Right Angle BNC Fittings Hi all, I am wiring in my com and transponder antennae. The wiring would be a little more elegant with a right angle connector on the antenna. B&C markets a right angle fitting: http://www.bandc.biz/bncrightangleadapter.aspx That runs about six bucks. Aircraft Spruce has a right angle fitting http://www.aircraftspruce.com/catalog/elpages/bncrfconnector.php that runs about $46. The question is, is there a significant dB loss using B&C's right angle adaptor as opposed to the right angle fitting from ACS? Thanks Michael Wynn RV 8 Finishing San Ramon, CA ________________________________ Message 6 _____________________________________ Time: 06:40:37 PM PST US From: "Noel Loveys" Subject: RE: AeroElectric-List: Ground Power / Tiedown Power Cart I hope this little diagram I just drew will help you. Just be sure to close the SPDT switch in the 12V position before charging. The drawing is for two sets of 12 V batteries wired into two sets of 12V. For this set up I would try to get batteries of matching amperage. You can add as many batteries as you want but I was thinking that four automotive storage batteries would be heavy enough for carting around. Noel From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ed Gilroy Sent: October 20, 2010 6:14 PM Subject: AeroElectric-List: Ground Power / Tiedown Power Cart Here's a subject I have not seen discussed, as of yet, on the list or in Bob's Aero-Electric Connection: We would like to construct a 12 volt, 24 volt, and 110 volt ground power cart for powering electrical tools, etc. and for jumping our club airplanes during the winters here in the wilds of Jersey. We have non-electrified outdoor tiedown spots. It would seem (2) 12 volt automotive batteries in series would be inexpensive and we would keep them charged via simple 12v solar chargers mounted on top of our storage shed. The 24V charging/inverting devices are hundreds of dollars. So how might such a circuit look to "isolate" the batteries for 12 volt charging and occasional 120v inverter usage from the 12v side and still allow on-demand 24/28V "jumping"? My thinking says manually isolate the 24v series circuit until I want to "jump" and just throw a switch to go 24v with everything else physically disconnected. Or is there a more elegant solution? Idiot proof would be best, remember these are pilots !!! I have thought about this for some months but see no simple solution to provide this "isolation" function but then I am a BSCS, not an EE. Thanks... Ed ________________________________ Message 7 _____________________________________ Time: 09:52:16 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Ground Power / Tiedown Power Cart Subject: AeroElectric-List: Ground Power / Tiedown Power Cart Here's a subject I have not seen discussed, as of yet, on the list or in Bob's Aero-Electric Connection: We would like to construct a 12 volt, 24 volt, and 110 volt ground power cart for powering electrical tools, etc. and for jumping our club airplanes during the winters here in the wilds of Jersey. We have non-electrified outdoor tiedown spots. It would seem (2) 12 volt automotive batteries in series would be inexpensive and we would keep them charged via simple 12v solar chargers mounted on top of our storage shed. The 24V charging/inverting devices are hundreds of dollars. So how might such a circuit look to "isolate" the batteries for 12 volt charging and occasional 120v inverter usage from the 12v side and still allow on-demand 24/28V "jumping"? My thinking says manually isolate the 24v series circuit until I want to "jump" and just throw a switch to go 24v with everything else physically disconnected. Or is there a more elegant solution? Idiot proof would be best, remember these are pilots !!! I have thought about this for some months but see no simple solution to provide this "isolation" function but then I am a BSCS, not an EE. Thanks... Ed I've had occasion to observer or participate in the fabrication of several battery carts over the years. Functionally, it's not a big deal except for that pesky DPDT switch that has to carry many hundreds of amps. You can synthesize the switch from an array of contactors but there is risk for shorting out one of the batteries if a contactor sticks. The simplest and least risky 12/24 switching involved changing some jumpers around on a sort of "stud panel" where the jumpers were brass bars held on threaded studs with large hand operated "nuts" . . . but the loose bars and exposed studs offered some slight risk of shorts . . . about he same degree of risk as for swinging wrenches on car battery (+) terminals. I've been pondering a design for a jumper bar assembly where the bars are sandwiched between two sheets of insulating material. The spacing of the studs is such that the array cannot be installed in any way except one that produces the 12/24 configuration. I'll publish the drawings in a day or so. Had them about done tonight but had to halt operations long enough to restore a c-drive. Bob . . . I've been pondering a variation on that idea Bob . . . ________________________________ Message 8 _____________________________________ Time: 10:24:35 PM PST US From: rayj Subject: Re: AeroElectric-List: Ground Power / Tiedown Power Cart Bob, A thought on the battery cart. I have a tig welder that has jumpers for various settings that used welding cable with male ends on it as jumpers. The females are mounted in a panel and the only time there might be an exposed connector would be if someone left a jumper end dangling. FWIW Raymond Julian Kettle River, MN On 10/23/2010 11:50 PM, Robert L. Nuckolls, III wrote: > *Subject: AeroElectric-List: Ground Power / Tiedown Power Cart > > Here's a subject I have not seen discussed, as of yet, on the list or in > Bob's Aero-Electric Connection: > > We would like to construct a 12 volt, 24 volt, and 110 volt ground power > cart for powering electrical tools, etc. and for jumping our club > airplanes during the winters here in the wilds of Jersey. We have > non-electrified outdoor tiedown spots. > > It would seem (2) 12 volt automotive batteries in series would be > inexpensive and we would keep them charged via simple 12v solar chargers > mounted on top of our storage shed. The 24V charging/inverting devices > are hundreds of dollars. > > So how might such a circuit look to "isolate" the batteries for 12 volt > charging and occasional 120v inverter usage from the 12v side and still > allow on-demand 24/28V "jumping"? > > My thinking says manually isolate the 24v series circuit until I want to > "jump" and just throw a switch to go 24v with everything else physically > disconnected. Or is there a more elegant solution? Idiot proof would be > best, remember these are pilots !!! > > I have thought about this for some months but see no simple solution to > provide this "isolation" function but then I am a BSCS, not an EE. > > Thanks... Ed > > * I've had occasion to observer or participate in the > fabrication of several battery carts over the years. > Functionally, it's not a big deal except for that > pesky DPDT switch that has to carry many hundreds > of amps. You can synthesize the switch from an array > of contactors but there is risk for shorting out one > of the batteries if a contactor sticks. > > The simplest and least risky 12/24 switching involved > changing some jumpers around on a sort of "stud panel" > where the jumpers were brass bars held on threaded > studs with large hand operated "nuts" . . . but > the loose bars and exposed studs offered some slight > risk of shorts . . . about he same degree of risk > as for swinging wrenches on car battery (+) terminals. > > I've been pondering a design for a jumper bar assembly > where the bars are sandwiched between two sheets > of insulating material. The spacing of the studs > is such that the array cannot be installed in any > way except one that produces the 12/24 configuration. > > I'll publish the drawings in a day or so. Had them > about done tonight but had to halt operations > long enough to restore a c-drive. > > Bob . . . > > I've been pondering a variation on that idea > > > Bob . . . > > * > > > * ________________________________ Message 9 _____________________________________ Time: 11:05:03 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Ground Power / Tiedown Power Cart At 12:18 AM 10/24/2010, you wrote: > >Bob, > >A thought on the battery cart. I have a tig welder that has jumpers >for various settings that used welding cable with male ends on it as >jumpers. The females are mounted in a panel and the only time there >might be an exposed connector would be if someone left a jumper end dangling. Yeah . . . I considered that kind of device. They're pretty pricey. Take a look at the hammer-n-tongs approach and see what you think. Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.