---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 06/24/20: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:03 AM - Re: Current consumption of Facet cube fuel pump (Ernest Christley) 2. 11:27 AM - Re: Current consumption of Facet cube fuel pump (Robert L. Nuckolls, III) 3. 01:00 PM - Re: Current consumption of Facet cube fuel pump (Werner Schneider) 4. 02:40 PM - Re: Current consumption of Facet cube fuel pump (Peter Pengilly) 5. 09:23 PM - WireViz (David Lewis) ________________________________ Message 1 _____________________________________ Time: 07:03:03 AM PST US From: Ernest Christley Subject: Re: AeroElectric-List: Current consumption of Facet cube fuel pump From the product description: Facet fuel pumps have low power requirements (about 1 amp at 12 volts) On Sunday, June 21, 2020, 5:53:03 PM EDT, Peter Pengilly wrote: Does anyone know the power rating (or current consumption) of a Facet 40105 fuel pump when operating at the low pressure end of its range (3 psi)? =C2- Thanks, Peter ________________________________ Message 2 _____________________________________ Time: 11:27:49 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Current consumption of Facet cube fuel pump At 09:00 AM 6/24/2020, you wrote: > From the product description: >Facet fuel pumps have low power requirements (about 1 amp at 12 volts) >On Sunday, June 21, 2020, 5:53:03 PM EDT, Peter Pengilly > wrote: >Does anyone know the power rating (or current consumption) of a >Facet 40105 fuel pump when operating at the low pressure end of its >range (3 psi)? >Thanks, Peter The reciprocating electric fuel pump has a rich and what is now perhaps ancient history. Early patents on this technology date back as far as 1920. Here's a small sample of patents awarded on this concept over the past 100 years! https://tinyurl.com/knsz7y9 The fundamental idea was to have a linear solenoid compress a spring that pushed a piston toward the pump's outlet port. A pair of check valves would (1) allow the piston to 'suck' fuel on the magnetic stroke while compressing the spring and (2) allowing spring force on the piston to 'push' fuel through the outlet port. There's an illustrated narrative of this process attached. Earliest versions featured electrical contacts in series with the solenoid coil that would close when the spring was at or near full extension. This was a source of wear and radio noise. Later improvements added a transistor to reduce current in the contacts to milliamps offering very long contact life and virtually zero electrical noise. Still later improvements replace the contacts with a solid state timer that simply pulses the coil so many times a minute. If there is no 'demand', i.e. carb float bowel closed, the piston and spring assumes fully compressed condition until flow resumes. Outlet pressure is set by spring force. Therefore, energy required to supply this pump is constant irrespective of pressure or flow. "Average" current flow may be on the order of 2A but peak current will be higher. Given that fuses can be 'hammered' by repetitive pulses at or near the fuse rating, one should power these pumps from a 5A fuse or breaker through 22 or 20AWG wire. I've got one of these thing laying around here somewhere . . . I'll see if I can set it up to capture current traces to explore the energy signature for average, peak and RMS values of current. Bob . . . ________________________________ Message 3 _____________________________________ Time: 01:00:24 PM PST US Subject: Re: AeroElectric-List: Current consumption of Facet cube fuel pump From: Werner Schneider I had them once measured on a 12V battery with 0.9A continouse and peak 1.2A Cheers On 24.06.2020 16:00, Ernest Christley wrote: > From the product description: > > Facet fuel pumps have low power requirements (about 1 amp at 12 volts) > > On Sunday, June 21, 2020, 5:53:03 PM EDT, Peter Pengilly > wrote: > > > Does anyone know the power rating (or current consumption) of a Facet > 40105 fuel pump when operating at the low pressure end of its range (3 > psi)? > > Thanks, Peter > ________________________________ Message 4 _____________________________________ Time: 02:40:38 PM PST US From: "Peter Pengilly" Subject: RE: AeroElectric-List: Current consumption of Facet cube fuel pump Thanks All, I looked all over the interweb for quite a while and couldn't find the answer! Peter From: owner-aeroelectric-list-server@matronics.com On Behalf Of Robert L. Nuckolls, III Sent: 24 June 2020 19:23 Subject: Re: AeroElectric-List: Current consumption of Facet cube fuel pump At 09:00 AM 6/24/2020, you wrote: >From the product description: Facet fuel pumps have low power requirements (about 1 amp at 12 volts) On Sunday, June 21, 2020, 5:53:03 PM EDT, Peter Pengilly > wrote: Does anyone know the power rating (or current consumption) of a Facet 40105 fuel pump when operating at the low pressure end of its range (3 psi)? Thanks, Peter The reciprocating electric fuel pump has a rich and what is now perhaps ancient history. Early patents on this technology date back as far as 1920. Here's a small sample of patents awarded on this concept over the past 100 years! https://tinyurl.com/knsz7y9 The fundamental idea was to have a linear solenoid compress a spring that pushed a piston toward the pump's outlet port. A pair of check valves would (1) allow the piston to 'suck' fuel on the magnetic stroke while compressing the spring and (2) allowing spring force on the piston to 'push' fuel through the outlet port. There's an illustrated narrative of this process attached. Earliest versions featured electrical contacts in series with the solenoid coil that would close when the spring was at or near full extension. This was a source of wear and radio noise. Later improvements added a transistor to reduce current in the contacts to milliamps offering very long contact life and virtually zero electrical noise. Still later improvements replace the contacts with a solid state timer that simply pulses the coil so many times a minute. If there is no 'demand', i.e. carb float bowel closed, the piston and spring assumes fully compressed condition until flow resumes. Outlet pressure is set by spring force. Therefore, energy required to supply this pump is constant irrespective of pressure or flow. "Average" current flow may be on the order of 2A but peak current will be higher. Given that fuses can be 'hammered' by repetitive pulses at or near the fuse rating, one should power these pumps from a 5A fuse or breaker through 22 or 20AWG wire. I've got one of these thing laying around here somewhere . . . I'll see if I can set it up to capture current traces to explore the energy signature for average, peak and RMS values of current. Bob . . . ________________________________ Message 5 _____________________________________ Time: 09:23:21 PM PST US Subject: AeroElectric-List: WireViz From: "David Lewis" I've become aware of a wiring documentation tool named WireViz. I think this might be a recent release as I find no mention of it in searches here or on VAF. An overview description can be found on this GitHub page: https://github.com/formatc1702/WireViz I'm slogging through the wiring of my RV7A project and at first blush this looks like a potentially efficient mechanism to document what I've done. I'm interested in hearing about any user experiences from folks here, or comments regarding gotcha's I should consider before embarking on a new learning curve. Thank you in advance. David Read this topic online here: http://forums.matronics.com/viewtopic.php?p=497028#497028 ------------------------------------------------------------------------------------- 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.