---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 01/06/09: 11 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:51 AM - Re: Will other wiring interfere with Magnetometer? (Allen Fulmer) 2. 07:28 AM - Re: Will other wiring interfere with Magnetometer? (Robert L. Nuckolls, III) 3. 08:47 AM - Re: What's thoughts on Cool Amp? () 4. 09:40 AM - Re: What's thoughts on Cool Amp? (rparigor@SUFFOLK.LIB.NY.US) 5. 10:06 AM - Re: Will other wiring interfere with Magnetometer? (Allen Fulmer) 6. 10:40 AM - Re: Will other wiring interfere with Magnetometer? (Peter Pengilly) 7. 04:23 PM - Re: What's thoughts on Cool Amp? (Robert L. Nuckolls, III) 8. 04:24 PM - Re: Ground Power (Robert L. Nuckolls, III) 9. 05:11 PM - Fuel pressure sender testing (Dennis Johnson) 10. 07:09 PM - Re: Will other wiring interfere with Magnetometer? (Allen Fulmer) 11. 10:07 PM - Re: What's thoughts on Cool Amp? (rparigor@SUFFOLK.LIB.NY.US) ________________________________ Message 1 _____________________________________ Time: 05:51:36 AM PST US From: "Allen Fulmer" Subject: RE: AeroElectric-List: Will other wiring interfere with Magnetometer? Okay, so it would be okay to run all the wires and cables thorough the same conduit but the current carrying ones "(such as navigation or landing light wires)" would still need to pass at least 12" from the magnetometer. With the magnetometer 18" forward of the rear spar (and thus the aileron steel mass balance tube) the wires for Nav and strobes will have to be routed 12" forward of that on their way to forward end of wingtip. That should be consistent with Bob Archer's antenna design. Thanks, Allen Fulmer >>>-----Original Message----- >>>From: owner-aeroelectric-list-server@matronics.com >>>[mailto:owner-aeroelectric-list-server@matronics.com]On >>>Behalf Of Robert >>>McCallum >>>Sent: Monday, January 05, 2009 11:37 PM >>>To: aeroelectric-list@matronics.com >>>Subject: Re: AeroElectric-List: Will other wiring interfere with >>>Magnetometer? >>> >>> >>> >>> >>>Allen; >>> >>>The instructions you cite seem to be referring to the location of the >>>magnetometer itself NOT the routing of its connecting wires. The >>>instructions say "when mounting the magnetometer - - etc >>>choose a location >>>away from magnetic disturbances" They make no mention of any >>>precautions to >>>be taken in routing or location of the connecting wires >>>which is what you'd >>>be running through your conduit. >>>No personal experience one way or the other, just my >>>interpretation of the >>>quotes you've submitted. >>> >>>Bob McC >>> >>>----- Original Message ----- >>>From: "Allen Fulmer" >>>To: >>>Sent: Monday, January 05, 2009 7:12 PM >>>Subject: AeroElectric-List: Will other wiring interfere with >>>Magnetometer? >>> >>> >>> >>>> >>>> Rather than hijack the thread on interference with Bob >>>Archer VOR antennas >>>I >>>> thought I would start a new thread on Magnetometer interference: >>>> >>>> My magnetometers will be on the end ribs of my RV7. >>>> >>>> GRT Magnetometer installation instructions read: >>>> ----------------------------------------------- >>>> "The most important consideration when mounting the >>>magnetometer is that >>>of >>>> choosing a location in the airplane that is away from magnetic >>>disturbances. >>>> It is quite amazing how sensitive the magnetometer is to these >>>disturbances, >>>> and how much error this can cause in the magnetic heading >>>reported by the >>>> AHRS." >>>> and then: >>>> "... be sure to keep the magnetometer at least 12 inches >>>away from any >>>> current carrying wires (such as navigation or landing >>>light wires), and >>>more >>>> than 18 inches away from ferrous metal, such as the steel >>>mass balance >>>tube >>>> that is typically used in the leading edge of ailerons." >>>> ----------------------------------------------- >>>> >>>> On my RV7, I only put two conduits in the wings as I was >>>building: one >>>near >>>> the trailing edge that runs parallel (and within 12 >>>inches) to the aileron >>>> "steel mass balance tube" and the other just behind the spar. This >>>forward >>>> run was originally going to carry all the wires to >>>strobes, nav. lights, >>>> landing lights, and coax to Bob Archer VOR antenna. >>>> >>>> I guess I could run all the electrical stuff in the rear >>>conduit and the >>>> magnetometer wires in the forward one. >>>> >>>> Opinion Bob? Other's experience? >>>> >>>> Thanks, >>>> >>>> Allen Fulmer >>>> RV7 wiring >>>> Alexander City, AL >>>> >>>> >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>> >>> ________________________________ Message 2 _____________________________________ Time: 07:28:33 AM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Will other wiring interfere with Magnetometer? At 07:49 AM 1/6/2009, you wrote: > >Okay, so it would be okay to run all the wires and cables thorough the same >conduit but the current carrying ones "(such as navigation or landing light >wires)" would still need to pass at least 12" from the magnetometer. > >With the magnetometer 18" forward of the rear spar (and thus the aileron >steel mass balance tube) the wires for Nav and strobes will have to be >routed 12" forward of that on their way to forward end of wingtip. That >should be consistent with Bob Archer's antenna design. Magnetometer installation is a good example of a case where careful paralleling and perhaps twisting of outbound/return current paths as they pass by the magnetometer. I had a builder who reported a compass swing of several degrees when he turned on nav lights. Seems he grounded the lamp locally and had a single power lead running only a few inches from the remote compass sensor. He fixed the problem by running a twisted pair for power and ground past the compass sensor. Strobe and antenna wiring generally have no risk to magnetometer calibration. Only those bundles/wires with significant unidirectional DC currents flowing in them have a potential for problems. Of course, DISTANCE is also a strong attenuator of magnetic effects. I forget the exact relationship but I'm thinking that effects of a wire at 1" are reduced by a factor of more than 100 at 10". Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 3 _____________________________________ Time: 08:47:02 AM PST US Subject: RE: AeroElectric-List: What's thoughts on Cool Amp? From: Ron, Were you planning on installing a 230 kv transformer in your craft? This stuff is for those big connectors that weld themselves shut when shorted. A dab of dielectric grease will do the same if needed for small applications like ours. From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of rparigor@SUFFOLK.LIB.NY.US Sent: Monday, January 05, 2009 6:06 PM Subject: AeroElectric-List: What's thoughts on Cool Amp? Anyone have any thoughts on using Cool Amp on buss and other high amperage connections? http://www.cool-amp.com/ It is a wipe on with damp cloth application. Ron Parigoris ________________________________ Message 4 _____________________________________ Time: 09:40:01 AM PST US Subject: RE: AeroElectric-List: What's thoughts on Cool Amp? From: rparigor@SUFFOLK.LIB.NY.US Hi longg "Were you planning on installing a 230 kv transformer in your craft? This > stuff is for those big connectors that weld themselves shut when > shorted. A dab of dielectric grease will do the same if needed for small > applications like ours." No the 230kv transformer will be used on my next flying project which will need to transform the tremendous amount of power coming out of next generation breadbox sized fuel cells! You refered to the wrong product I had in mind. I wanted to know about using the silver plating powder called: Cool-Amp Silver Plating Powder Part #1233-500 that can be used in situation for increasing conductivity and help keep copper from corroding. Specific it is intended for: Cool-Amp Can Be Used On: Bus Bars - Cable Terminals - Current Transformers - Terminals - Clamps & Fittings Other Uses Include: Ham Radios - PCBs - Welders - Musical Instruments When used on PCBs I think it not only helps copper from corroding, but will help with high frequency transmissions. See: http://www.cool-amp.com/cool-amp.html Specific I was interested in using it for a connections in picture #28 and #31: http://www.europaowners.org/modules.php?set_albumName=album266&op=modload&name=gallery&file=index&include=view_album.php My friend has some Amp cool that he will lend me. Anyone have any comments on soldering to a silver plated piece of copper? If I were to do so, would it be worht it to use this solder from mcMaster that has a lower than 63-37 melting point (354F): Tin/Lead/Silver/Antimony with Rosin Flux Composed of 62% tin, 35.75% lead, 2% silver, and 0.25% antimony. For use on silver-plated surfaces and heat-sensitive components and near previously soldered joints. You were talking about : Conducto-Lube Ron Parigoris ________________________________ Message 5 _____________________________________ Time: 10:06:39 AM PST US From: "Allen Fulmer" Subject: RE: AeroElectric-List: Will other wiring interfere with Magnetometer? Thank you, Bob! That will be easy to do now as I am just pulling wires. Stein Air has a two conductor shielded cable: MIL-27500 Tefzel AWG22 - 2 Conductor Shielded Cable Would this be "the best" even if a little more expensive? (LED Nav lights only draw .3 amp or so per wing.) And if shielded is fine then ground one end of the shield at forest of tabs on firewall? Thanks again for all you do for us. Allen Fulmer >>>-----Original Message----- >>>From: owner-aeroelectric-list-server@matronics.com >>>[mailto:owner-aeroelectric-list-server@matronics.com]On >>>Behalf Of Robert >>>L. Nuckolls, III >>>Sent: Tuesday, January 06, 2009 9:26 AM >>>To: aeroelectric-list@matronics.com >>>Subject: RE: AeroElectric-List: Will other wiring interfere with >>>Magnetometer? >>> >>> >>>Nuckolls, III" >>> >>>At 07:49 AM 1/6/2009, you wrote: >>> >>>> >>>>Okay, so it would be okay to run all the wires and cables >>>thorough the same >>>>conduit but the current carrying ones "(such as navigation >>>or landing light >>>>wires)" would still need to pass at least 12" from the magnetometer. >>>> >>>>With the magnetometer 18" forward of the rear spar (and >>>thus the aileron >>>>steel mass balance tube) the wires for Nav and strobes will >>>have to be >>>>routed 12" forward of that on their way to forward end of >>>wingtip. That >>>>should be consistent with Bob Archer's antenna design. >>> >>> >>> Magnetometer installation is a good example of >>> a case where careful paralleling and perhaps >>> twisting of outbound/return current paths as they >>> pass by the magnetometer. I had a builder who >>> reported a compass swing of several degrees when >>> he turned on nav lights. Seems he grounded the lamp >>> locally and had a single power lead running only >>> a few inches from the remote compass sensor. >>> >>> He fixed the problem by running a twisted pair >>> for power and ground past the compass sensor. >>> Strobe and antenna wiring generally have no risk >>> to magnetometer calibration. >>> >>> Only those bundles/wires with significant unidirectional >>> DC currents flowing in them have a potential for >>> problems. Of course, DISTANCE is also a strong >>> attenuator of magnetic effects. I forget the >>> exact relationship but I'm thinking that effects >>> of a wire at 1" are reduced by a factor of more >>> than 100 at 10". >>> >>> >>> >>> >>> Bob . . . >>> >>> ----------------------------------------) >>> ( . . . a long habit of not thinking ) >>> ( a thing wrong, gives it a superficial ) >>> ( appearance of being right . . . ) >>> ( ) >>> ( -Thomas Paine 1776- ) >>> ---------------------------------------- >>> >>> >>> >>> >>> >>> >>> ________________________________ Message 6 _____________________________________ Time: 10:40:07 AM PST US From: "Peter Pengilly" Subject: RE: AeroElectric-List: Will other wiring interfere with Magnetometer? Allen, A few years ago I worked on an airplane that was the first of type to have a magnetic anomaly detector in the fuselage. The thing could cope with constant magnetic fields - that is circuits that were always on or off, but not with variable ones. We learnt that shielded wires have no effect on the magnetic influence of current carrier, and that a simple twisted pair is by far better (I think the reason why was explained on the list a week or two ago). So don't bother with the shielded wire, just twist up a pair of 22g wires yourself - something like 5 to 10 twists per foot should be adequate. Peter -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Allen Fulmer Sent: 06 January 2009 18:05 Subject: RE: AeroElectric-List: Will other wiring interfere with Magnetometer? Thank you, Bob! That will be easy to do now as I am just pulling wires. Stein Air has a two conductor shielded cable: MIL-27500 Tefzel AWG22 - 2 Conductor Shielded Cable Would this be "the best" even if a little more expensive? (LED Nav lights only draw .3 amp or so per wing.) And if shielded is fine then ground one end of the shield at forest of tabs on firewall? Thanks again for all you do for us. Allen Fulmer >>>-----Original Message----- >>>From: owner-aeroelectric-list-server@matronics.com >>>[mailto:owner-aeroelectric-list-server@matronics.com]On >>>Behalf Of Robert >>>L. Nuckolls, III >>>Sent: Tuesday, January 06, 2009 9:26 AM >>>To: aeroelectric-list@matronics.com >>>Subject: RE: AeroElectric-List: Will other wiring interfere with >>>Magnetometer? >>> >>> >>>Nuckolls, III" >>> >>>At 07:49 AM 1/6/2009, you wrote: >>> >>>> >>>>Okay, so it would be okay to run all the wires and cables >>>thorough the same >>>>conduit but the current carrying ones "(such as navigation >>>or landing light >>>>wires)" would still need to pass at least 12" from the magnetometer. >>>> >>>>With the magnetometer 18" forward of the rear spar (and >>>thus the aileron >>>>steel mass balance tube) the wires for Nav and strobes will >>>have to be >>>>routed 12" forward of that on their way to forward end of >>>wingtip. That >>>>should be consistent with Bob Archer's antenna design. >>> >>> >>> Magnetometer installation is a good example of >>> a case where careful paralleling and perhaps >>> twisting of outbound/return current paths as they >>> pass by the magnetometer. I had a builder who >>> reported a compass swing of several degrees when >>> he turned on nav lights. Seems he grounded the lamp >>> locally and had a single power lead running only >>> a few inches from the remote compass sensor. >>> >>> He fixed the problem by running a twisted pair >>> for power and ground past the compass sensor. >>> Strobe and antenna wiring generally have no risk >>> to magnetometer calibration. >>> >>> Only those bundles/wires with significant unidirectional >>> DC currents flowing in them have a potential for >>> problems. Of course, DISTANCE is also a strong >>> attenuator of magnetic effects. I forget the >>> exact relationship but I'm thinking that effects >>> of a wire at 1" are reduced by a factor of more >>> than 100 at 10". >>> >>> >>> >>> >>> Bob . . . >>> >>> ----------------------------------------) >>> ( . . . a long habit of not thinking ) >>> ( a thing wrong, gives it a superficial ) >>> ( appearance of being right . . . ) >>> ( ) >>> ( -Thomas Paine 1776- ) >>> ---------------------------------------- >>> >>> >>> >>> >>> >>> >>> ________________________________ Message 7 _____________________________________ Time: 04:23:54 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: What's thoughts on Cool Amp? At 05:05 PM 1/5/2009, you wrote: >Anyone have any thoughts on using Cool Amp on buss and other high >amperage connections? > >http://www.cool-amp.com/ > >It is a wipe on with damp cloth application. There's a host of elixers and potions intended to improve the quality of electrical connections . . . particularly those that are not permanently gas-tight (soldered/crimped). A few examples . . . http://www.stabilant.com.au/body_what_is_stabilant_22_.html http://urgentcomm.com/mag/radio_electrical_contact_enhancer/ http://www.dedicatedaudio.com/inc/sdetail/19153 http://www.positive-feedback.com/Issue17/xtremequicksilver.htm http://www.deoxit.com/ Each of these products claims some capabilities to remove impediments to good connection (corrosion/ contaminants), fill the voids between mating surfaces with some conductor usually in liquid suspension of some kind (silver flakes?), finally some feature that protects a made up joint from environmental attack. We had a processes guru look at several products while I was a Beech years ago. Most of the products evaluated went to failures of manufacturing process. Consistency of manufacturing process is one of the reasons that crimped joints won out over soldered joints. I forget how many different products were looked at but in the final analysis, the legacy processes that had evolved over decades of military and type certified experience was shown not to benefit from any of magic juices. I guess there was one exception . . . the Stabilant 22 was evaluated by our brothers at Raytheon Mass and found useful for the rapidly disappearing gold fingers on card edges which were never very popular with the aircraft guys. Short answer is if the pieces are clean and then joined up gas-tight, there's no need for further treatment. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 8 _____________________________________ Time: 04:24:34 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Ground Power At 07:24 PM 1/3/2009, you wrote: >Bob, there's been some discussion on ground power setup over on the >VAF list, and there's an issue that has come up that needs your sage advise. > >My design is based on a modified version of the one you have >published (I use the milspec plug and add an over-ride so that I can >force power out of the connector as well). Another builder has a >different design that feeds the electrical system after the master >contactor (not directly to the battery): See >http://nerv10.com/wcurtis/90Electric...eBookPage2.pdf. > >I contend that if he has a dead battery, he cannot charge it with >ground power, or even with a running engine. In my opinion, this >defeats one of the purposes of ground power, which is jump-starting >an aircraft with a dead battery. Since you can't fly without >electrical power (usually). He claims that this is the way Cessna >does it, and maybe they think that if you have a dead battery, you >should charge it with a proper charger rather than jumpstarting and >using your (overstressed) alternator to do the job for you. > >What are your thoughts on this? It's a toss up. It's being done both ways on TC aircraft since day one. All biz-jets at H-B can be operated from ground power with the battery switch off. The architecture described in your cited link was crafted by someone who marches to his/her own drum. Set up your own design goals and drive toward them. When I crafted . . . http://www.aeroelectric.com/articles/grndpwr.pdf I was coming from a background of having a line boy hitting my 14v airplane with a 28v ground power cart. That got me to thinking about the fact that the C172XP offered no way for the pilot to have absolute control over external power. It also occurred to me that I could be hit with a reversed polarity. I wanted to KNOW when ground power was available before it was actually connected to the airplane. Ov protection was a pretty good thing too. Finally, I wanted to charge a battery externally without powering up the whole airplane. The architecture you cited was crafted to different goals. I'm mildly curious as to why the fuses were added . . . but then, one builder's goals are another builder's conundrum. The lesson to be learned here that ANY architecture crafted to rational design goals is fine. The risks are that some features are driven my irrational concerns. Other features may be driven by incorrect deductions. Nobody's rationale is "golden". Decide what you want to do, make it happen and understand its limitations. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 9 _____________________________________ Time: 05:11:14 PM PST US From: "Dennis Johnson" Subject: AeroElectric-List: Fuel pressure sender testing Hi Sheldon, Take another look at the EIS instruction manual, including any documentation you got with the fuel pressure sensor itself. You need to change the offset value (I think, it's been two years since I did this) in order to get a zero psi when there is no pressure. It's in the instruction manual, but you may have to hunt for it. You can also call EIS; they have always been eager to help whenever I called. Good luck, Dennis ________________________________ Message 10 ____________________________________ Time: 07:09:41 PM PST US From: "Allen Fulmer" Subject: RE: AeroElectric-List: Will other wiring interfere with Magnetometer? Thank you Peter. Easier still!! >>>-----Original Message----- >>>From: owner-aeroelectric-list-server@matronics.com >>>[mailto:owner-aeroelectric-list-server@matronics.com]On >>>Behalf Of Peter >>>Pengilly >>>Sent: Tuesday, January 06, 2009 12:35 PM >>>To: aeroelectric-list@matronics.com >>>Subject: RE: AeroElectric-List: Will other wiring interfere with >>>Magnetometer? >>> >>> >>> >>> >>>Allen, >>> >>>A few years ago I worked on an airplane that was the first >>>of type to have a >>>magnetic anomaly detector in the fuselage. The thing could cope with >>>constant magnetic fields - that is circuits that were always >>>on or off, but >>>not with variable ones. We learnt that shielded wires have >>>no effect on the >>>magnetic influence of current carrier, and that a simple >>>twisted pair is by >>>far better (I think the reason why was explained on the list >>>a week or two >>>ago). So don't bother with the shielded wire, just twist up >>>a pair of 22g >>>wires yourself - something like 5 to 10 twists per foot >>>should be adequate. >>> >>>Peter >>> >>>-----Original Message----- >>>From: owner-aeroelectric-list-server@matronics.com >>>[mailto:owner-aeroelectric-list-server@matronics.com] On >>>Behalf Of Allen >>>Fulmer >>>Sent: 06 January 2009 18:05 >>>To: aeroelectric-list@matronics.com >>>Subject: RE: AeroElectric-List: Will other wiring interfere with >>>Magnetometer? >>> >>> >>> >>>Thank you, Bob! >>> >>>That will be easy to do now as I am just pulling wires. >>> >>>Stein Air has a two conductor shielded cable: MIL-27500 >>>Tefzel AWG22 - 2 >>>Conductor Shielded Cable >>> >>>Would this be "the best" even if a little more expensive? >>>(LED Nav lights >>>only draw .3 amp or so per wing.) >>> >>>And if shielded is fine then ground one end of the shield at >>>forest of tabs >>>on firewall? >>> >>>Thanks again for all you do for us. >>> >>>Allen Fulmer >>> >>>>>>-----Original Message----- >>>>>>From: owner-aeroelectric-list-server@matronics.com >>>>>>[mailto:owner-aeroelectric-list-server@matronics.com]On >>>>>>Behalf Of Robert >>>>>>L. Nuckolls, III >>>>>>Sent: Tuesday, January 06, 2009 9:26 AM >>>>>>To: aeroelectric-list@matronics.com >>>>>>Subject: RE: AeroElectric-List: Will other wiring interfere with >>>>>>Magnetometer? >>>>>> >>>>>> >>>>>>Nuckolls, III" >>>>>> >>>>>>At 07:49 AM 1/6/2009, you wrote: >>>>>> >>>>>>> >>>>>>>Okay, so it would be okay to run all the wires and cables >>>>>>thorough the same >>>>>>>conduit but the current carrying ones "(such as navigation >>>>>>or landing light >>>>>>>wires)" would still need to pass at least 12" from the >>>magnetometer. >>>>>>> >>>>>>>With the magnetometer 18" forward of the rear spar (and >>>>>>thus the aileron >>>>>>>steel mass balance tube) the wires for Nav and strobes will >>>>>>have to be >>>>>>>routed 12" forward of that on their way to forward end of >>>>>>wingtip. That >>>>>>>should be consistent with Bob Archer's antenna design. >>>>>> >>>>>> >>>>>> Magnetometer installation is a good example of >>>>>> a case where careful paralleling and perhaps >>>>>> twisting of outbound/return current paths as they >>>>>> pass by the magnetometer. I had a builder who >>>>>> reported a compass swing of several degrees when >>>>>> he turned on nav lights. Seems he grounded the lamp >>>>>> locally and had a single power lead running only >>>>>> a few inches from the remote compass sensor. >>>>>> >>>>>> He fixed the problem by running a twisted pair >>>>>> for power and ground past the compass sensor. >>>>>> Strobe and antenna wiring generally have no risk >>>>>> to magnetometer calibration. >>>>>> >>>>>> Only those bundles/wires with significant unidirectional >>>>>> DC currents flowing in them have a potential for >>>>>> problems. Of course, DISTANCE is also a strong >>>>>> attenuator of magnetic effects. I forget the >>>>>> exact relationship but I'm thinking that effects >>>>>> of a wire at 1" are reduced by a factor of more >>>>>> than 100 at 10". >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Bob . . . >>>>>> >>>>>> ----------------------------------------) >>>>>> ( . . . a long habit of not thinking ) >>>>>> ( a thing wrong, gives it a superficial ) >>>>>> ( appearance of being right . . . ) >>>>>> ( ) >>>>>> ( -Thomas Paine 1776- ) >>>>>> ---------------------------------------- >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> ________________________________ Message 11 ____________________________________ Time: 10:07:53 PM PST US Subject: Re: AeroElectric-List: What's thoughts on Cool Amp? From: rparigor@SUFFOLK.LIB.NY.US Hi Bob Thx. for the reply. "> Short answer is if the pieces are clean and then joined > up gas-tight, there's no need for further treatment." Keeping my parts clean and creating an absolute gas tight seal using 6-32 screws to hold components together I think can be a challenge. The product I spoke of is simple pure silver plating. Do you see a problem depositing about 1/10,000 inch of pure silver on the areas of buss bar where it will meet tin plated terminals? Do you see a problem depositing about 1/10,000 inch of pure silver on the areas of my .032" thick and .75" wide thin wire where it meet silver plated copper buss? Do you see a problem depositing about 1/10,000 inch of pure silver on theinside of my buss bypass (picture #31) so it will be ready to crimp, then solder to copper clad #4 aluminium wire? See pictures #31 to #34: http://www.europaowners.org/modules.php?set_albumName=album266&id=bb8&op=modload&name=gallery&file=index&include=view_photo.php I fooled with soldering to silver plated copperand brass with 60-40 and 63-37 and it works great. I want to try a silver bearing solder: Tin/Lead/Silver/Antimony with Rosin Flux— Composed of 62% tin, 35.75% lead, 2% silver, and 0.25% antimony. For use on silver-plated surfaces and heat-sensitive components and near previously soldered joints. Meets Fed. Spec. QQ-S-571E and J-STD-006. this solder has a lower melting point than 63-37, and I believe becauers it has some silver, it will be easier on silver plating?? Whats your thought on using this solder on silver plating? I think it will also be good for soldering surface mounted components that I need to do on occasion?It is 5 core rosin flux solder part # 7687A63 from McMaster. Ron Parigoris ------------------------------------------------------------------------------------- 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.