---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 10/27/09: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:05 AM - Re: What is the type of this pin? (Overtorque) 2. 05:40 AM - Alternator quit working, Coupling () 3. 06:05 AM - Re: Flakey UPS AT GPS/COM (rampil) 4. 11:08 AM - What makes diode get warm (rvg8tor) 5. 11:24 AM - Bending male tabs on diode (rvg8tor) 6. 12:06 PM - Re: What makes diode get warm (Charlie England) 7. 01:18 PM - Re: What makes diode get warm (plaurence) 8. 01:26 PM - Re: What makes diode get warm (Matt Prather) 9. 01:34 PM - Re: Transponder antenna location (John B Szantho) 10. 03:46 PM - Re: Re: Transponder antenna location (thomas sargent) ________________________________ Message 1 _____________________________________ Time: 04:05:01 AM PST US Subject: AeroElectric-List: Re: What is the type of this pin? From: "Overtorque" Hi everybody, I found the name of my contact: Amphenol AIRLB.... Fortunatly I met a guy familiar with this type of contact. Thank you very much for all input Overtorque Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269622#269622 ________________________________ Message 2 _____________________________________ Time: 05:40:47 AM PST US From: Subject: AeroElectric-List: Alternator quit working, Coupling 10/27/2009 Hello Travis, You wrote: 1) "My alternator coupling failed...AGAIN!" Bummer -- I feel a bit guilty because I steered you in the direction of Drake back in November 2006. The history of your alternator couplings is not clear to me: a) Your original TCM factory provided coupling that came with your engine failed after how many hours? b) You sent the original failed coupling off to Drake and they refurbished it. How many hours did you get on this refurbished coupling before it failed? 2) "I emailed Drake Air this morning and was inquiring as to why their part failed...prematurely...in my opinion!" In addition to this query to Drake (from whom you may not get a completely unbiased answer) I would call TCM Technical Services (1-888-826-5465) and ask some questions: a) What is the expected service hours life of their elastomeric coupling? b) What factors could shorten that service life? c) Do they have any info from the field on the durability of Drake's coupling versus TCM's coupling? d) Who makes the TCM coupling? You can see where this is heading. It may turn out that a $1,600 TCM coupling is a more cost effective item than a $450 Drake refurbished coupling. The durability of the Drake refurbished coupling would be dependent upon: A) The quality of the elastomeric material used, and B) The quality of the workmanship in casting / assembling the coupling. Can you recall how the original TCM coupling failed? Was it a shearing of the elastomeric or was it a separation of the elastomeric from the metal parts? Similarly, how did the Drake refurbished coupling fail? Was it a shearing of the elastomeric or was it a separation of the elastomeic from the metal parts? Regardless of which coupling source you decide to use you may want to apply the torque test to it before you install it. The torque test is described in the TCM SB95-3B. Good luck and please keep us informed. 'OC' Says: "The best investment we can make is the effort to gather and understand knowledge." PS: I am flying a KIS TR-1 with a TCM IO-240 B9B engine with a Prince P tip prop. 263 hours tach time with the engine above 1,500 RPM. With my new wheel pants I can get 140 knots indicated airspeed. ========================================================== Time: 01:18:14 PM PST US Subject: AeroElectric-List: Re: Continental IO-240: Alternator quit working, Coupling Failed From: "FlyboyTR" The past 254 hours have been great...until yesterday. My alternator coupling failed...AGAIN! I had purchased a rebuilt unit from Drake Air (as noted above in this thread). $450 versus $1,600 from TCM for a new one. Is there any reason this part should fail so soon? Oil, hours, temps, alternator load, how the load is applied, etc? I emailed Drake Air this morning and was inquiring as to why their part failed...prematurely...in my opinion! I have to pull my engine to remove the alternator. ...insult to injury! :? Again...I welcome input from the forum! Travis :) -------- Travis Rayner Mobile, AL Skystar Vixen, N-789DF Continental IO-240, Prince P-Tip Prop ADI-II Autopilot AnyWhereMap Navigation with weather Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269543#269543 ________________________________ Message 3 _____________________________________ Time: 06:05:15 AM PST US Subject: AeroElectric-List: Re: Flakey UPS AT GPS/COM From: "rampil" Is that ground signal the only intermittent you have? You might rework that one pin to wire joint on the back side of the connector. Does pulling the unit straight forward break the connection? It might be a faulty pin or poorly captured one in the connector body. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269635#269635 ________________________________ Message 4 _____________________________________ Time: 11:08:33 AM PST US Subject: AeroElectric-List: What makes diode get warm From: "rvg8tor" I have the B&C diode on the heat sink (smaller one). I was bench testing things to make sure the flow was correct, I just took the breaker panel and hooked up power to the main bus then the E-bus. The diode did not heat up at all, the flow was in the correct direction. I hooked up power to the E-bus and the diode did prevent current to the main bus, the main would only read 0.4 volts which I assume is normal. With this set up the diode again did not heat up. I then hooked up one of the 50W MR16 landing light bulbs to a CB thinking maybe I needed a load, again the diode did not heat up. So what make the diode heat up, is it more load on the system or is it when there is power going to both buses, as when you have the master on and the E-bus alternate feed on at the same time. With both buses getting power the diode is getting power from both sides. I hear you can fly around this way but not sure I will, my plan now is the have my E-bus alternate feed under a guarded switch that stay off when guarded. When the E-bus gets power from the main via the diode there is a slight voltage drop, the the E-bus alternate feed was on the flow from the battery to the E-bus would win out and supply the E-bus since the voltage from the main is lower. So would this meeting of currents be what heats up the diode? As far as flying around with the E-bus alternate feed on I don't see the need with my system I have a standby alternator. Once I am using standby power then I might consider turning the alternate feed on for automatic switching in case the standby alternator then quit. Thank for the help. Cheer Mike -------- Mike "Nemo" Elliott RV-8A QB (Fuselage) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269670#269670 ________________________________ Message 5 _____________________________________ Time: 11:24:48 AM PST US Subject: AeroElectric-List: Bending male tabs on diode From: "rvg8tor" My diode is mounted on my CB panel which is by my right leg. When I hooked up the blade connectors they stick out just enough that the radius of wire touches the fuselage. I bent over the tabs with some duck bill pliers, the diode arrived with one tab slightly bent so I knew they are fairly easy to bend. The thing bench tests fine, other than heat shrinking the connector since they are closer to the sides of the diode is there anything wrong with doing this? Picture attached for illustration. -------- Mike "Nemo" Elliott RV-8A QB (Fuselage) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269674#269674 ________________________________ Message 6 _____________________________________ Time: 12:06:17 PM PST US From: Charlie England Subject: Re: AeroElectric-List: What makes diode get warm rvg8tor wrote: > > I have the B&C diode on the heat sink (smaller one). I was bench testing things to make sure the flow was correct, I just took the breaker panel and hooked up power to the main bus then the E-bus. The diode did not heat up at all, the flow was in the correct direction. I hooked up power to the E-bus and the diode did prevent current to the main bus, the main would only read 0.4 volts which I assume is normal. With this set up the diode again did not heat up. I then hooked up one of the 50W MR16 landing light bulbs to a CB thinking maybe I needed a load, again the diode did not heat up. > > So what make the diode heat up, is it more load on the system or is it when there is power going to both buses, as when you have the master on and the E-bus alternate feed on at the same time. With both buses getting power the diode is getting power from both sides. I hear you can fly around this way but not sure I will, my plan now is the have my E-bus alternate feed under a guarded switch that stay off when guarded. When the E-bus gets power from the main via the diode there is a slight voltage drop, the the E-bus alternate feed was on the flow from the battery to the E-bus would win out and supply the E-bus since the voltage from the main is lower. So would this meeting of currents be what heats up the diode? As far as flying around with the E-bus alternate feed on I don't see the need with my system I have a standby alternator. Once I am using standby power then I might consider turning the alternate feed on for automatic switching in case the standby alternator th! > en quit. Thank for the help. > > Cheer > Mike > > -------- Bob will probably provide a better answer, but the quick & dirty is that it's called a 'semi-conductor' because it's not a pure conductor. There's some resistance even with the electrons flowing 'forward', and it will heat up due to the work being done pushing them through this resistance, just like a wire heats up with a lot of current flowing through it. With more electrons flowing (more current), more heat. Charlie ________________________________ Message 7 _____________________________________ Time: 01:18:06 PM PST US From: "plaurence" Subject: RE: AeroElectric-List: What makes diode get warm Mike, If you have a second alternator, and using B&C's regulators, you really don't need the E buss. Peter -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of rvg8tor Sent: Tuesday, October 27, 2009 2:06 PM Subject: AeroElectric-List: What makes diode get warm I have the B&C diode on the heat sink (smaller one). I was bench testing things to make sure the flow was correct, I just took the breaker panel and hooked up power to the main bus then the E-bus. The diode did not heat up at all, the flow was in the correct direction. I hooked up power to the E-bus and the diode did prevent current to the main bus, the main would only read 0.4 volts which I assume is normal. With this set up the diode again did not heat up. I then hooked up one of the 50W MR16 landing light bulbs to a CB thinking maybe I needed a load, again the diode did not heat up. So what make the diode heat up, is it more load on the system or is it when there is power going to both buses, as when you have the master on and the E-bus alternate feed on at the same time. With both buses getting power the diode is getting power from both sides. I hear you can fly around this way but not sure I will, my plan now is the have my E-bus alternate feed under a guarded switch that stay off when guarded. When the E-bus gets power from the main via the diode there is a slight voltage drop, the the E-bus alternate feed was on the flow from the battery to the E-bus would win out and supply the E-bus since the voltage from the main is lower. So would this meeting of currents be what heats up the diode? As far as flying around with the E-bus alternate feed on I don't see the need with my system I have a standby alternator. Once I am using standby power then I might consider turning the alternate feed on for automatic switching in case the standby alternator th! en quit. Thank for the help. Cheer Mike -------- Mike "Nemo" Elliott RV-8A QB (Fuselage) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=269670#269670 ________________________________ Message 8 _____________________________________ Time: 01:26:48 PM PST US Subject: Re: AeroElectric-List: What makes diode get warm From: "Matt Prather" > > > rvg8tor wrote: >> >> I have the B&C diode on the heat sink (smaller one). I was bench >> testing things to make sure the flow was correct, I just took the >> breaker panel and hooked up power to the main bus then the E-bus. The >> diode did not heat up at all, the flow was in the correct direction. I >> hooked up power to the E-bus and the diode did prevent current to the >> main bus, the main would only read 0.4 volts which I assume is normal. >> With this set up the diode again did not heat up. I then hooked up one >> of the 50W MR16 landing light bulbs to a CB thinking maybe I needed a >> load, again the diode did not heat up. >> >> So what make the diode heat up, is it more load on the system or is it >> when there is power going to both buses, as when you have the master on >> and the E-bus alternate feed on at the same time. With both buses >> getting power the diode is getting power from both sides. I hear you >> can fly around this way but not sure I will, my plan now is the have my >> E-bus alternate feed under a guarded switch that stay off when guarded. >> When the E-bus gets power from the main via the diode there is a slight >> voltage drop, the the E-bus alternate feed was on the flow from the >> battery to the E-bus would win out and supply the E-bus since the >> voltage from the main is lower. So would this meeting of currents be >> what heats up the diode? As far as flying around with the E-bus >> alternate feed on I don't see the need with my system I have a standby >> alternator. Once I am using standby power then I might consider turning >> the alternate feed on for automatic switching in case the standby >> alternator ! > th! >> en quit. Thank for the help. >> >> Cheer >> Mike >> >> -------- > Bob will probably provide a better answer, but the quick & dirty is > that it's called a 'semi-conductor' because it's not a pure conductor. > There's some resistance even with the electrons flowing 'forward', and > it will heat up due to the work being done pushing them through this > resistance, just like a wire heats up with a lot of current flowing > through it. With more electrons flowing (more current), more heat. > > Charlie > Right. The ebus diode will run hottest when the ebus is powered through it. To observe this, the ebus alternate feed switch needs to be open, and power (battery) directly to the main bus. At this point, any loads on the ebus will pull current through the diode and cause it to heat up. Regards, Matt- ________________________________ Message 9 _____________________________________ Time: 01:34:59 PM PST US From: "John B Szantho" Subject: AeroElectric-List: Re: Transponder antenna location I plan to position my transponder antenna (GTX330) just behind the firewall on the left, next to the fuel vent line (RV9A). This location is about 34" from the back of the transponder. Do you guys see any problems with this location, if you do where would you place the antenna. The whip-style COM antenna will be located behind the pilots seat. Also do you know of a good wiring diagram between the SL30 and the GMA340 audio box. Thanks for any help. John ________________________________ Message 10 ____________________________________ Time: 03:46:54 PM PST US Subject: Re: AeroElectric-List: Re: Transponder antenna location From: thomas sargent John: As a rule of thumb an antenna wants a ground plane around it that is infinite. In practice it should be at least (roughly) a wave long or so i n all directions. The more the better. What I mean is that the antenna might have a more radially uniform pattern if it was not right at the edge of the floor skin, immediately behind the firewall. That gives it an asymmetric ground plane and will distort the antenna pattern. I put mine closer to th e gear weldment (on a 6A) so that it was under the seat skins. I kept it abou t 1 wavelength away from the steel (=conductive) landing gear. (at 1GHz 1 w ave is about a foot - your xponder antenna is 1/4 wave). I haven't run the thing yet, so I can't tell you that it works well there, just that it should work better there than at the forward edge of things. In practice it might not matter much. Still, I thought it better not to tempt fate. Antenna design is a black art. On Tue, Oct 27, 2009 at 1:33 PM, John B Szantho wrote: > I plan to position my transponder antenna (GTX330) just behind the > firewall on the left, next to the fuel vent line (RV9A). This location is > about 34=9D from the back of the transponder. Do you guys see any p roblems > with this location, if you do where would you place the antenna. The > whip-style COM antenna will be located behind the pilots seat. Also do yo u > know of a good wiring diagram between the SL30 and the GMA340 audio box. > Thanks for any help. > > John > > * > =========== =========== =========== =========== > * > > -- Tom Sargent ------------------------------------------------------------------------------------- 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.