---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 06/15/08: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:49 AM - Re: Z13-8b Brown Out Relay Question ? (user9253) 2. 09:22 AM - Two Fuel pumps Z-19RB (Sam Hoskins) 3. 10:29 AM - Re: Two Fuel pumps Z-19RB (Ken) 4. 11:04 AM - Speed Brake Switch (Jon Hults) 5. 12:04 PM - Re: Speed Brake Switch (Jeffrey W. Skiba) 6. 01:54 PM - Re: Speed Brake Switch (Robert Feldtman) 7. 08:52 PM - Re: Speed Brake Switch (Robert McCallum) ________________________________ Message 1 _____________________________________ Time: 04:49:15 AM PST US Subject: AeroElectric-List: Re: Z13-8b Brown Out Relay Question ? From: "user9253" Bill, Oops, my mistake. I thought you were talking about the Alternate Feed Relay and my first reply was in reference to that. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=187958#187958 ________________________________ Message 2 _____________________________________ Time: 09:22:55 AM PST US From: "Sam Hoskins" Subject: AeroElectric-List: Two Fuel pumps Z-19RB All, I am looking for a better way to handle switching for my fuel injection fuel pumps. I have uploaded the diagram here: http://www.mistakeproofing.net/transfer/N202SH_POWER_DISTRIBUTION_06.pdf Look in the lower portion of the drawing. I am using the RWS fuel/ignition controller which has the ability to receive power from two sources, which should fit well with Z-19. However, I have added a backup fuel pump. I have a selector switch that determines which system supplies the fuel pumps. Then, I have added a switch that will allow me to run either pump, but not both. The problem is, I have to feed each pump through two switches, doubling my chance of failure. Any suggestions? Thanks. Sam Hoskins Quickie Q-200 EFI ________________________________ Message 3 _____________________________________ Time: 10:29:12 AM PST US From: Ken Subject: Re: AeroElectric-List: Two Fuel pumps Z-19RB Sam I run an oem subaru EFI as my primary. I am not concerned if I happen to have both fuel pumps on together. With both of my pumps on, the pressure goes up 2 or 3 psi. The fuel flow change is minuscule (proportional to the square root of the fuel pressure). Nominal is around 36 psi above MAP. Actually my engine continues to run if I double the normal fuel flow. My hazy memory is that the oem pumps draw about 4 amps or so each so that is not a big deal either. I chose to not give either computer the ability to control the second fuel pump. Some guys like to retain auto shutdown of both pumps in the event of a crash but my second pump is not normally on in flight. I preferred to have no switches or wiring that is common to both pumps which also simplifies things. Ken Sam Hoskins wrote: > All, > > I am looking for a better way to handle switching for my fuel injection > fuel pumps. I have uploaded the diagram here: > http://www.mistakeproofing.net/transfer/N202SH_POWER_DISTRIBUTION_06.pdf > Look in the lower portion of the drawing. > I am using the RWS fuel/ignition controller which has the ability to > receive power from two sources, which should fit well with Z-19. > However, I have added a backup fuel pump. I have a selector switch that > determines which system supplies the fuel pumps. Then, I have added a > switch that will allow me to run either pump, but not both. > > The problem is, I have to feed each pump through two switches, doubling > my chance of failure. > > Any suggestions? > > Thanks. > > Sam Hoskins > Quickie Q-200 EFI ________________________________ Message 4 _____________________________________ Time: 11:04:31 AM PST US From: "Jon Hults" Subject: AeroElectric-List: Speed Brake Switch Bob & All, I have a 4-way momentary "China hat" switch on my Infinity Aerospace throttle handle that I want to use for flaps (up & down) and speed brakes (fwd & aft). The Precise Flight speed brakes require an ON-OFF switch because once power is removed, they will close. Let me preface my question with the fact the electricity is "not my area"! My question is how do I use the MOM switch to provide continuous voltage to the speed brake asymmetry module to keep them extended? Does it require a relay or some other electrical equipment? Or should I just use an ON-OFF switch somewhere else? Thanks, Jon Hults Lancair Legacy ________________________________ Message 5 _____________________________________ Time: 12:04:37 PM PST US From: "Jeffrey W. Skiba" Subject: RE: AeroElectric-List: Speed Brake Switch How about a Flip Flop Circuit? Something like: http://ourworld.compuserve.com/homepages/Bill_Bowden/page9.htm see the section for: "CMOS Toggle Flip Flop Using Push Button" You would have to build the circuit. Hoe that helps Jeff. Sent: Sunday, June 15, 2008 1:00 PM Subject: AeroElectric-List: Speed Brake Switch Bob & All, I have a 4-way momentary "China hat" switch on my Infinity Aerospace throttle handle that I want to use for flaps (up & down) and speed brakes (fwd & aft). The Precise Flight speed brakes require an ON-OFF switch because once power is removed, they will close. Let me preface my question with the fact the electricity is "not my area"! My question is how do I use the MOM switch to provide continuous voltage to the speed brake asymmetry module to keep them extended? Does it require a relay or some other electrical equipment? Or should I just use an ON-OFF switch somewhere else? Thanks, Jon Hults Lancair Legacy ________________________________ Message 6 _____________________________________ Time: 01:54:35 PM PST US From: "Robert Feldtman" Subject: Re: AeroElectric-List: Speed Brake Switch aare the speed brakes on the wings? or on the fuselage (like a cozy or Long EZ)? If on the wings, you'd need to have huge concern about potential assymetric drag if one side has voltage failure and the other doesn't, could flip inverted if the drag was serious enough on the wing. if it is non-asymmetric, then disregard the above safety concern.. bobf On Sun, Jun 15, 2008 at 12:59 PM, Jon Hults wrote: > Bob & All, > > I have a 4-way momentary "China hat" switch on my Infinity Aerospace > throttle handle that I want to use for flaps (up & down) and speed brakes > (fwd & aft). The Precise Flight speed brakes require an ON-OFF switch > because once power is removed, they will close. > > Let me preface my question with the fact the electricity is "not my area"! > My question is how do I use the MOM switch to provide continuous voltage to > the speed brake asymmetry module to keep them extended? Does it require a > relay or some other electrical equipment? Or should I just use an ON-OFF > switch somewhere else? > > Thanks, > Jon Hults > Lancair Legacy > > * > > * > > ________________________________ Message 7 _____________________________________ Time: 08:52:04 PM PST US From: "Robert McCallum" Subject: Re: AeroElectric-List: Speed Brake Switch John; Assuming you wish to use one momentary switch to turn "ON" the circuit and another (opposite side of the "China Hat") to turn "OFF" the circuit, two SPDT relays will do the trick. See attached word document. Please excuse the rudimentary sketch. The quadruple ovals represent the relay coils. The diode is to protect the switch from the load current. (assuming the list accepts the attachment) Bob McC ----- Original Message ----- From: Jon Hults To: aeroelectric-list@matronics.com Sent: Sunday, June 15, 2008 1:59 PM Subject: AeroElectric-List: Speed Brake Switch Bob & All, I have a 4-way momentary "China hat" switch on my Infinity Aerospace throttle handle that I want to use for flaps (up & down) and speed brakes (fwd & aft). The Precise Flight speed brakes require an ON-OFF switch because once power is removed, they will close. Let me preface my question with the fact the electricity is "not my area"! My question is how do I use the MOM switch to provide continuous voltage to the speed brake asymmetry module to keep them extended? Does it require a relay or some other electrical equipment? Or should I just use an ON-OFF switch somewhere else? Thanks, Jon Hults Lancair Legacy ------------------------------------------------------------------------------------- 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.