---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 07/14/03: 22 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:45 AM - Routing cables around back of panel (Neville Kilford) 2. 04:01 AM - Re: Re: EI Install - Firewall Penetration (Dan Checkoway) 3. 05:41 AM - Re: Re: EI Install - Firewall Penetration (John Schroeder) 4. 06:15 AM - Re: Re: EI Install - Firewall Penetration (Robert L. Nuckolls, III) 5. 06:58 AM - Re: Builder documentation on the Web-summary (Robert L. Nuckolls, III) 6. 07:03 AM - Wind driven generator for Corben Jr. ACE (Robert L. Nuckolls, III) 7. 07:36 AM - Infinity stick grip wiring (Greg's Mail) 8. 08:48 AM - Capacitor on output of PM alternator? (Robert L. Nuckolls, III) 9. 08:48 AM - Re: Infinity stick grip wiring (Robert L. Nuckolls, III) 10. 09:00 AM - Re: Re: EI Install - Firewall Penetration (Robert L. Nuckolls, III) 11. 09:54 AM - Re: Re: EI Install - Firewall Penetration (Dan Checkoway) 12. 10:03 AM - Re: Infinity stick grip wiring (John Schroeder) 13. 10:09 AM - Essential Bus Diode Wiring (mailbox bob at mail.flyboybob.com) 14. 10:43 AM - Re: Re: EI Install - Firewall Penetration (Robert L. Nuckolls, III) 15. 10:49 AM - Re: Wind driven generator for Corben Jr. ACE (Werner Schneider) 16. 12:04 PM - Re: Re: EI Install - Firewall Penetration (Matt Prather) 17. 01:11 PM - Re: power supply (Ken Harrill) 18. 02:08 PM - Re: electronic MAP control (rwilliams) 19. 03:21 PM - Re: Essential Bus Diode Wiring (Robert L. Nuckolls, III) 20. 03:22 PM - Re: power supply (Robert L. Nuckolls, III) 21. 04:13 PM - Gas Turbines (Eric M. Jones) 22. 09:41 PM - Re: power supply (Dave von Linsowe) ________________________________ Message 1 _____________________________________ Time: 01:45:35 AM PST US From: "Neville Kilford" Subject: AeroElectric-List: Routing cables around back of panel --> AeroElectric-List message posted by: "Neville Kilford" Hi guys, Does anyone have any suggestions for routing bundles of cables and tubes around the back of the instrument panel? I'm using cable ties and screw-down bases for routing around the inside of the firewall, where the fuseholders are, but I'm trying to avoid screws going through the panel. I can weld some lugs on the blind side of the panel to support cables, but I'd be interested to know if there's a handy way of doing it. While I'm on the subject, what about the routing of cables from behind instruments, radios, etc. It's only a foot or so, but what's a good way to secure cables from the back of a radio, say, down to the panel? It seems as though I should add some structure to support all the back-of-panel wiring and tubing. Thanks! Nev -- Jodel D150 in progress UK ________________________________ Message 2 _____________________________________ Time: 04:01:44 AM PST US From: "Dan Checkoway" Subject: Re: AeroElectric-List: Re: EI Install - Firewall Penetration --> AeroElectric-List message posted by: "Dan Checkoway" My feeling is "wassabigdeal?!" I'm not ABOUT to cut a 1" hole in my firewall when I could get away with a much smaller pass-through just for the wire. I'll be chopping my connector off. http://rvproject.com/images/2003/20030713_lightspeed_harness.jpg That's a photo of what the 15-pin connector looks like when you take the housing off, as it comes from LightSpeed. I don't understand why you wouldn't just order a new crimp pin connector from Mouser (or the like) for *less than a buck*, cut the wires off one by one and crimp on D-subs and insert 'em into the new connector. Don't even need to label if you do it one wire at a time. But I plan on cutting the existing connector off, running the wire through a small pass-through (along with the bundle of engine transducer/sensor wires, but not with the coil wires), and then crimping on the new connector once the wire passes aft of the firewall. http://rvproject.com/images/2003/20030713_lightspeed_schematic.jpg That's a crappy photo of the schematic that comes with the LightSpeed system...but you've got a reference if you get stuck. I understand why Klaus doesn't want to support myriad problems when people cut off his connector and screw up installing a new one, but I also don't think it's that complicated that we should consider gouging our firewalls unnecessarily. Hopefully sometime in the next few weeks I'll wrap up the firewall forward wiring on my RV-7, so I'll have pics on the site for reference. By the way, the 15-pin connector housings are available from Mouser...part # 156-1415 (receptacle) or 156-1416 (plug), and the crimp pin/socket contacts are on page 603 of the online catalog as well. http://www.mouser.com/catalog/614/603.pdf )_( Dan RV-7 N714D http://www.rvproject.com ----- Original Message ----- From: "Tinne maha" Subject: Re: AeroElectric-List: Re: EI Install - Firewall Penetration > --> AeroElectric-List message posted by: "Tinne maha" > > > Yes, Bob. Your presumption is correct. LSE supplies a pre-wired harness with a15 pin connector on one end the direct crank sensor cirquit board on the other. The 15 pin connector hooks up to the control module which is recommended to be installed behind the firewall. A minimum of 3 inches away from these input wires the installer is supposed to route 2 seaparate RG58 coaxial cables thatconnect to the 2ignition coils (assuming a 4 cylinder engine) > > > LSE cannot recommend cutting re-splicing/soldering the input wires to get them through the firewall so they recommend drilling a hole just large enough to get the bare minimum of the 15 pin connector (cover removed) through the firewall.I could do that just find a mondo grommet that I'd have tocut a radius in but itkinda bugs me. I think Ilike your d-sub idea but I don't know much at all about them. Seen the pictures on the tools page but that's it. I'm pretty sure when I say 15 pin connector it is a d-sub but I don't know for sure I certainly don't know if they are removable but I will research that pathas soon as time allows. > > > Unfortunately I'm having to work out of town for a week and wont have internet access until Saturday the 19th. This is my last post until then but I look forward to your response. > > > Thanks, > > > Grant > > > From: "Robert L. Nuckolls, III" > To: aeroelectric-list@matronics.com > Subject: AeroElectric-List: Re: EI Install - Firewall Penetration > Date: Sun, 13 Jul 2003 15:43:21 -0500 > > -- AeroElectric-List message posted by: "Robert L. Nuckolls, III" > > At 03:21 PM 7/13/2003 -0500, you wrote: > -- AeroElectric-List message posted by: Jeff Point > > I just installed this as well. I decided that it would be less work to > drill a 1 inch hole in the firewall than to cut/ splice the wiring. A > good 1 inch hole saw works well for this. I used a stainless firewall > shield with an asbestos washer to seal the opening. On the plus side, > you can run lots of other wires through this big hole (but not the LSE > high voltage wires! > > > Do I presume correctly that there is a manufacturer supplied > harness with connector installed that needs to go through > the firewall? I think I would replace the connector with > one that uses removable pins . . . like a d-sub. Before you > install pins in new connector, route the harness through > a smaller hole. > > What kind of high voltage wires need to come through the > firewall? > > Bob . . . > > ________________________________ Message 3 _____________________________________ Time: 05:41:00 AM PST US Subject: Re: AeroElectric-List: Re: EI Install - Firewall Penetration From: John Schroeder --> AeroElectric-List message posted by: John Schroeder Dan - Can you use the machined pins with these? Looks like they use the cheaper pins. John DO NOT ARCHIVE > By the way, the 15-pin connector housings are available from > Mouser...part # > 156-1415 (receptacle) or 156-1416 (plug), and the crimp pin/socket > contacts > are on page 603 of the online catalog as well. ________________________________ Message 4 _____________________________________ Time: 06:15:26 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: EI Install - Firewall Penetration --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 04:00 AM 7/14/2003 -0700, you wrote: >--> AeroElectric-List message posted by: "Dan Checkoway" > >My feeling is "wassabigdeal?!" I'm not ABOUT to cut a 1" hole in my >firewall when I could get away with a much smaller pass-through just for the >wire. I'll be chopping my connector off. > >http://rvproject.com/images/2003/20030713_lightspeed_harness.jpg yup . . . good ol' d-sub. cutoff and replacement is a piece of cake. Go with machined pins, throw away the saddle-clamp strain-relief and replace with silicon tape wrap sufficient to provide very snug fit in the exit hole of the backshell like this: http://216.55.140.222/Catalog/avionics/760harn.jpg Crimped on d-subs have to be the easiest connectors in the world to work with. Wouldn't hesitate for a second to chop one off and replace it. Don't even need to label if you do it >one wire at a time. But I plan on cutting the existing connector off, >running the wire through a small pass-through (along with the bundle of >engine transducer/sensor wires, but not with the coil wires), and then >crimping on the new connector once the wire passes aft of the firewall. Tell me about the "coil wires" . . . are these the infamous coax cable leads? Why wouldn't one route these same hole? Bob . . . ________________________________ Message 5 _____________________________________ Time: 06:58:17 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Builder documentation on the Web-summary --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 01:50 PM 7/10/2003 -0400, you wrote: >--> AeroElectric-List message posted by: John Schroeder > > >Bob - > >I tried to import your Z-14FADEC.pdf file into my full up Acrobat v5.0 >program. It is very fuzzy and poor quality compared to your other .pdf >files. I then saved it and tried to import it into CorelDraw to get it into >.dxf format. This has worked very well in the past. However, when I pull up >the .dxf file in AutoCAD 2000LT, the drawing is still fuzzy and full of >artifacts. All of the lines and most of the text are composed of >polylines!! This is very strange and definitely not the same quality >translation of some of your files I've been able to obtain in the past. It >might be a case of too much line weight control.:-)) > >Could you post the Z-14FADEC in a dwg format on your website? Much obliged. Okay. http://216.55.140.222/Page_Per_System/Power_Distribution/z14_fadec.dwg Bob . . . ________________________________ Message 6 _____________________________________ Time: 07:03:21 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Wind driven generator for Corben Jr. ACE --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 05:47 PM 7/3/2003 +0000, you wrote: >Below is the result of your inquiry. It was submitted by >Lewis Hood (lewis.hood@us.army.mil) on Thursday, July 3, 2003 at 10:47:29 > >Thursday, July 3, 2003 > >Lewis Hood > >, >Email: lewis.hood@us.army.mil >Comments/Questions: I have built A non-electric Corben Jr. ACE. I wish to >use Microair VHF with air driven generator (no vac drive on my eng) any >suggestions on the generator? am willing to build same.1 amp should be >adequate. THANKS I've had in the back of my mind a project to see what can be done with a bicycle generator fitted with model airplane propeller driving a high efficiency rectifier/regulator. There was a similar project written up in Sport Aviation about 10-15 years ago. Don't recall details now and I'm curious just how much energy can be extracted from such a system with careful attention to the physics. Have you considered an alkaline battery pack of two 6v lantern batteries. Lots of capacity for size, excellent shelf life. REALLY easy to put in the airplane. I'll bet a pair of batteries would carry your radio for a year's worth of flying. I will invite you to join us on the AeroElectric List to continue this and similar discussions. It's useful to share the information with as many folks as possible. A further benefit can be realized with membership on the list. There are lots of technically capable folks on the list who can offer suggestions too. You can join at . . . http://www.matronics.com/subscribe/ Thanks! Bob . . . |---------------------------------------------------| | A lie can travel half way around the world while | | the truth is till putting on its shoes . . . | | -Mark Twain- | |---------------------------------------------------| ________________________________ Message 7 _____________________________________ Time: 07:36:57 AM PST US From: "Greg's Mail" <50coperhed@jbntelco.com> Subject: AeroElectric-List: Infinity stick grip wiring --> AeroElectric-List message posted by: "Greg's Mail" <50coperhed@jbntelco.com> What would be the best connector to install on the leads coming out of Infinity stick grip harness , the switches are rated at 8 amps.max. Would the D sub connectors be heavy enough? Thanks Greg Davis ________________________________ Message 8 _____________________________________ Time: 08:48:30 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Capacitor on output of PM alternator? --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 02:42 PM 7/14/2003 +0000, you wrote: >Below is the result of your inquiry. It was submitted by >Derek Ferris (derekferris@cox.net) on Monday, July 14, 2003 at 07:42:06 > >Monday, July 14, 2003 > >Derek Ferris > >, >Email: derekferris@cox.net >Comments/Questions: Bob: >What is the ideal rating (capacitance & voltage) for the computer-grade >filter capacitor, used with the Rotax 912 18A alternator? >I have seen various ratings in drawings - 20,000, 22,000, 47,000, 16V, 25V >- and so on. >Mallory who makes these capacitors does not offer all of these ratings. >Lastly, is the capacitor really necessary or highly advisable? Any capacitor 20,000 uF or more, 16V or more will be a great asset to the reduction of rectified AC ripple that comes from any rectifier/regulator for a PM alternator. I would go for a 47 KuF and plan to replace it every three or four years. >One home-builder told me he saw no difference in his radio noise with or >without the capacitor. Then HIS radio noise is coming from another antagonist. Elimination of the capacitor does not mean you WILL have noise nor does inclusion of the capacitor mean you WILL NOT have noise. It's simply one of many things we do to improve the overall performance of the system. I will invite you to join us on the AeroElectric List to continue this and similar discussions. It's useful to share the information with as many folks as possible. A further benefit can be realized with membership on the list. There are lots of technically capable folks on the list who can offer suggestions too. You can join at . . . http://www.matronics.com/subscribe/ Thanks! Bob . . . |---------------------------------------------------| | A lie can travel half way around the world while | | the truth is till putting on its shoes . . . | | -Mark Twain- | |---------------------------------------------------| ________________________________ Message 9 _____________________________________ Time: 08:48:33 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Infinity stick grip wiring --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 09:36 AM 7/14/2003 -0500, you wrote: >--> AeroElectric-List message posted by: "Greg's Mail" ><50coperhed@jbntelco.com> > >What would be the best connector to install on the leads coming out >of Infinity stick grip harness , the switches are rated at 8 amps.max. >Would the D sub connectors be heavy enough? >Thanks Greg Davis That's what I would use . . . Bob . . . ________________________________ Message 10 ____________________________________ Time: 09:00:45 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: EI Install - Firewall Penetration --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 08:39 AM 7/14/2003 -0400, you wrote: >--> AeroElectric-List message posted by: John Schroeder > > >Dan - > >Can you use the machined pins with these? Looks like they use the cheaper >pins. > >John >DO NOT ARCHIVE Machined pins will generally fit into housings supplied with sheet metal pins. I buy housings at Radio Shack, throw away the pins, and use machined pins all the time. Bob . . . ________________________________ Message 11 ____________________________________ Time: 09:54:15 AM PST US From: "Dan Checkoway" Subject: Re: AeroElectric-List: Re: EI Install - Firewall Penetration --> AeroElectric-List message posted by: "Dan Checkoway" > Tell me about the "coil wires" . . . are these the infamous > coax cable leads? Why wouldn't one route these same hole? Yep, they're the two coax leads going from the brain box to the coils' two fast-ons each. From the LSE installation manual online: "Route the RG58 coax cables to the ignition coils. Avoid their exposure to heat from cylinder heads or exhaust systems. The primary ignition coil wires running from the Plasma CD Ignition module to the ignition coils can be routed together, however they should be kept separate from the ignition system input wires (harness)." Plenty of specificity in "kept separate," huh? 8-) I recall somebody else posting a 3" suggested separation. In my case, the installation takes care of separation. I have the direct crank sensor, so my "input wire harness" will run beneath the cylinders, secured to the case via adel clamps, then up along the engine mount and in through the sensor wire pass-through. My coil wires will go pretty much directly from the brain box, which I've installed centered in front of the pilot about 4" behind the firewall, straight across the top of the mount and case to the coils (exact coil location TBD...discussing that on the lycoming/rv-lists as we speak). So the separation of coil leads and the crank sensor harness is sort of "built in." )_( Dan RV-7 N714D http://www.rvproject.com ________________________________ Message 12 ____________________________________ Time: 10:03:36 AM PST US Subject: Re: AeroElectric-List: Infinity stick grip wiring From: John Schroeder --> AeroElectric-List message posted by: John Schroeder Some folks have used the mini connectors from model airplane shops. As I recall, they used 22 awg and it worked OK. John ________________________________ Message 13 ____________________________________ Time: 10:09:33 AM PST US From: "mailbox bob at mail.flyboybob.com" Subject: AeroElectric-List: Essential Bus Diode Wiring --> AeroElectric-List message posted by: "mailbox bob at mail.flyboybob.com" 'Lectric Bob, On page Z-9 of The AeroElectric Connection, Figure Z-11 shows the full wave bridge rectifier being used to power the essential bus from the main bus. Why did you not connect the input side to both AC terminals? From the schematic it appears that this will give you twice the diode capacity. Wouldn't it be better to use two diodes at half the power each to get the same DC+ output result? Regards, Bob Lee ______________________________ N52BL KR2 Suwanee, GA 30024 91% done only 51% to go! Phone/Fax: 770/844-7501 mailto:bob@flyboybob.com http://flyboybob.com ________________________________ Message 14 ____________________________________ Time: 10:43:25 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: EI Install - Firewall Penetration --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 09:52 AM 7/14/2003 -0700, you wrote: >--> AeroElectric-List message posted by: "Dan Checkoway" > > > Tell me about the "coil wires" . . . are these the infamous > > coax cable leads? Why wouldn't one route these same hole? > >Yep, they're the two coax leads going from the brain box to the coils' two >fast-ons each. > > From the LSE installation manual online: > >"Route the RG58 coax cables to the ignition coils. Avoid their exposure to >heat from cylinder heads or exhaust systems. The primary ignition coil >wires running from the Plasma CD Ignition module to the ignition coils can >be routed together, however they should be kept separate from the ignition >system input wires (harness)." I can deduce no good reason for extra-ordinary separation efforts. This wire SHOULD be a shielded, twisted pair fabricated from modern, high temperature insulation. But even with the low temperature coax, there's no reason in physics to suspect these wires as possible antagonists. For every electron going out on center conductor, there is a companion electron coming back on the shield - net magnetic field is zero. Shielding takes care of any potential electro-static coupling. Bob . . . ________________________________ Message 15 ____________________________________ Time: 10:49:20 AM PST US From: "Werner Schneider" Subject: Re: AeroElectric-List: Wind driven generator for Corben Jr. ACE --> AeroElectric-List message posted by: "Werner Schneider" > >Comments/Questions: I have built A non-electric Corben Jr. ACE. I wish to > >use Microair VHF with air driven generator (no vac drive on my eng) any > >suggestions on the generator? am willing to build same.1 amp should be > >adequate. THANKS > > I've had in the back of my mind a project to see what can > be done with a bicycle generator fitted with model airplane > propeller driving a high efficiency rectifier/regulator. > We are using in our L-4, non electric a small accumulator and a solarpanel about 10 by 20 inches, works out very well with a small becker radio. Werner ________________________________ Message 16 ____________________________________ Time: 12:04:48 PM PST US Subject: Re: AeroElectric-List: Re: EI Install - Firewall Penetration From: "Matt Prather" --> AeroElectric-List message posted by: "Matt Prather" A little empiracle data below... snip >> cable leads? Why wouldn't one route these same hole? >> >>Yep, they're the two coax leads going from the brain box to the coils' >> two fast-ons each. >> >> From the LSE installation manual online: >> >>"Route the RG58 coax cables to the ignition coils. Avoid their >> exposure to heat from cylinder heads or exhaust systems. The primary >> ignition coil wires running from the Plasma CD Ignition module to the >> ignition coils can be routed together, however they should be kept >> separate from the ignition system input wires (harness)." > > I can deduce no good reason for extra-ordinary separation > efforts. This wire SHOULD be a shielded, twisted pair fabricated > from modern, high temperature insulation. But even with the > low temperature coax, there's no reason in physics to suspect > these wires as possible antagonists. For every electron going > out on center conductor, there is a companion electron coming back > on the shield - net magnetic field is zero. Shielding takes care of > any potential electro-static coupling. > > Bob . . . > > I actually didn't even use shielded wire for either the wires to the coil, nor the ones from the crank triggers. I did twist the pair of wires leading to each device from the brain box (though I am not positive that is even required/beneficial - think it is for the sensors, as the input probably has good common mode rejection). All of the wires are bundled together for about 2 feet from the engine end of the motor mount, through the firewall to the LSE box. No evidence of malfunction, misfire, or other noise issues. It might be fun to scope them sometime, however. Regards, Matt Prather N34RD ________________________________ Message 17 ____________________________________ Time: 01:11:01 PM PST US From: Ken Harrill Subject: RE: AeroElectric-List: power supply --> AeroElectric-List message posted by: Ken Harrill Dave, I used a LM-317T voltage regulator to provide ship's power to my DRE headsets. I talked with the DRE tech support and they suggested this approach. It works very well. I have had no problems with noise or headset damage. Ken Harrill RV-6, 215 hours -----Original Message----- From: Dave von Linsowe [mailto:davevon@tir.com] Subject: Re: AeroElectric-List: power supply --> AeroElectric-List message posted by: "Dave von Linsowe" Bob, What are your thoughts on how clean the power source for ANR headsets need to be? If I build a LM-317 voltage regulator and it's not good enough, could I damage the ANR circuitry? How will the ANR respond if the input is not clean enough? I've got the Headset Inc. ANR setup in a Peltor 7005 and it really works great! I'm also using their auto shut off battery box, which I'm sure has saved me a couple of batteries already. The problem is that the battery box lays on the floor in front of the spar (RV-6) out of sight and out of mind. The headset plugs are down under the panel (I didn't put them there). I'll forget to turn it on before I'm strapped in and can't reach the box and/or forget to turn it off when I hop out. (I know, could be a check list item, but I think something like this should be transparent) I'm going to upgrade my copilot's (wife) headset soon and just wanted to get a handle on this. Not affiliated with Headsets Inc. in any way, just like the way it works. Thanks, Dave RV-6 The Silver Turtle ----- Original Message ----- From: "Dave von Linsowe" Subject: Re: AeroElectric-List: power supply > --> AeroElectric-List message posted by: "Dave von Linsowe" > > Thanks John, > > I was wondering about the LM-317 being a clean enough power source. My main > reason for wanting to go with the aircraft power system is to eliminate the > need to turn the ANR on and off separate from everything else. > > Dave > > > ----- Original Message ----- > From: > To: > Subject: Re: AeroElectric-List: power supply > > > > --> AeroElectric-List message posted by: KITFOXZ@aol.com > > > > In a message dated 7/10/2003 10:22:33 AM Eastern Standard Time, > > davevon@tir.com writes: > > > > > Active noise reduction systems require a very stable and clean power > > > supply. Our panel-mount power supply has 2 voltage regulators, a DC-DC > converter > > > for isolation, and an in-line 1/4 amp fuse. > > > > > > > > > > Dave, > > > > The ANR headset manufacturer's statement is true to get the best > performance > > possible. A DC-DC converter is considerable more parts count than just an > > LM-317 and voltage divider resistors. They are building or selling a > power > > supply that truly isolates input and supplied output voltages. > > > > If cheap is what you want, see how many 9 V batteries you can buy for $80. > > ...A stand alone battery is the best isolation possible...You could attach > a > > small charging circuit to your ship's power cheaply that could keep a 9.6 > V > > NiCad battery pack alive and switch it out of the circuit manually, etc. > > > > John P. Marzluf > > Columbus, Ohio > > Kitfox Outback (out back in the garage) ________________________________ Message 18 ____________________________________ Time: 02:08:18 PM PST US From: "rwilliams" Subject: AeroElectric-List: Re: electronic MAP control --> AeroElectric-List message posted by: "rwilliams" As I mentioned in my original post, I was suspicious of the electric supercharger. What I was really trying to ask was, "Is anyone utilizing an electronic control for engine boost-either turbocharger/wastegate or other?" Sorry that my question lead everyone off in the wrong direction. The discussion of the Aerosance FADEC system has been interesting. Is anyone working on a similar homerolled system? ________________________________ Message 19 ____________________________________ Time: 03:21:01 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Essential Bus Diode Wiring --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 01:09 PM 7/14/2003 -0400, you wrote: >--> AeroElectric-List message posted by: "mailbox bob at >mail.flyboybob.com" > >'Lectric Bob, > >On page Z-9 of The AeroElectric Connection, Figure Z-11 shows the full wave >bridge rectifier being used to power the essential bus from the main bus. > >Why did you not connect the input side to both AC terminals? From the >schematic it appears that this will give you twice the diode capacity. >Wouldn't it be better to use two diodes at half the power each to get the >same DC+ output result? Diodes generally don't parallel well. I.e., if you're EXPECTING to get twice the current capability by paralleling two diodes, it doesn't work. Now, since a major goal of configuring the elegant endurance bus is to MINIMIZE loads on battery while conducting en route flight operations, then we're never expecting to push the nominally 25A rated diodes toward their limits. In this case, paralleling two diodes MIGHT have a very slight effect on reducing forward voltage drop . . . perhaps 0.1 volts or so. The short answer to you question is that it wouldn't hurt anything but it wont be a big help either. Bob . . . ________________________________ Message 20 ____________________________________ Time: 03:22:13 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: power supply --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" At 04:09 PM 7/14/2003 -0400, you wrote: >--> AeroElectric-List message posted by: Ken Harrill > > > >Dave, > >I used a LM-317T voltage regulator to provide ship's power to my DRE >headsets. I talked with the DRE tech support and they suggested this >approach. It works very well. I have had no problems with noise or headset >damage. > >Ken Harrill >RV-6, 215 hours Thanks for that useful data point Ken . . . Bob . . . ________________________________ Message 21 ____________________________________ Time: 04:13:33 PM PST US From: "Eric M. Jones" Subject: AeroElectric-List: Gas Turbines --> AeroElectric-List message posted by: "Eric M. Jones" For the real experimental types who want a bargain. The US government is auctioning 60-120 kw gas turbine power plants, also smaller Teledyne and Rotax engines on http://www.govliquidation.com/ Whether they are usable or not depends on how resourceful you are. They seem to be VERY low time powerplants. It might be worth a look. Some government stuff is just a large box of stuff. The bid description says "Stuff in large box". Often these are real deals. One "large shipping crate A/C parts" some years ago went for $500 and it turned out to be an F104B. Eric M. Jones ________________________________ Message 22 ____________________________________ Time: 09:41:08 PM PST US From: "Dave von Linsowe" Subject: Re: AeroElectric-List: power supply --> AeroElectric-List message posted by: "Dave von Linsowe" Thanks to everyone for taking the time to come up with an inexpensive (cheap) power supply for my ANR headsets. At the price of these, I can build up a few of each, test them and have some for my buddies! This list is great! Thanks, Dave ----- Original Message ----- From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: power supply > --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" > > At 04:09 PM 7/14/2003 -0400, you wrote: > >--> AeroElectric-List message posted by: Ken Harrill > > > > > > > >Dave, > > > >I used a LM-317T voltage regulator to provide ship's power to my DRE > >headsets. I talked with the DRE tech support and they suggested this > >approach. It works very well. I have had no problems with noise or headset > >damage. > > > >Ken Harrill > >RV-6, 215 hours > > Thanks for that useful data point Ken . . . > > Bob . . . > >