---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 04/03/19: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:55 AM - magnetometers (Bobby Paulk) 2. 08:03 AM - Re: Piper Arrow Pitot Mast (Pat Little) 3. 09:12 AM - Super Battery-Tender followup (Robert L. Nuckolls, III) 4. 06:23 PM - Re: Z-12 questions (prestonkavanagh) 5. 06:49 PM - Re: Re: Z-12 question (Robert L. Nuckolls, III) 6. 06:57 PM - Re: Re: Z-12 question (Alec Myers) ________________________________ Message 1 _____________________________________ Time: 06:55:31 AM PST US From: Bobby Paulk Subject: AeroElectric-List: magnetometers This is a story you won't find anywhere else. While building a fast build kit I had my galvanized rudder cables laying on a table. Someone ( not me ) moved them onto a DC welding machine that was used several times in the next day or two. I had mounted my magnetometer way back in the tail ( right between the rudder cables ) to get it away from all the electronics and antennas. When checking out the remote compass outside without anything on I moved the rudder pedals and got 200 to 300 degrees deflection. No amount of degausing would get a usable compass. I moved it up and behind the baggage compartment and it became the most accurate compass I have flown behind. Another note FYI: A wet compass is influenced if it is too near a non electric tachometer. Works fine with engine off but changes a few degrees with RPM when the engine is running due to the magnetic clutch in the tach. ________________________________ Message 2 _____________________________________ Time: 08:03:56 AM PST US From: Pat Little Subject: Re: AeroElectric-List: Piper Arrow Pitot Mast Thanks, Ron. I like the idea of an ice detector! On Tue, Apr 2, 2019 at 8:48 AM R Adams wrote: > Hey Pat > > I used to fly one of these on a Seneca > > Every time I got into ice it froze over and I lost the airspeed indicator > (which made it quite handy as an ice detector) > > Was told it was a design flaw... it didn=99t have enough capacity t o heat > the mass of the probe sufficiently > > All the best! > > Ron > > ________________________________ Message 3 _____________________________________ Time: 09:12:41 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Super Battery-Tender followup The device I purchased a few weeks back has been 'tending' a 7a.h. battery that was degraded to about 9v open circuit and zero capacity. After one week, the battery's voltage has not climbed by any significant amount nor has a load test shown any improvement in energy delivery. Further, the battery is noticeably warmer than room temp. I'm thinking that this product isn't going to resurrect batteries from the dead. I need a test subject that was replaced due to depressed capacity . . . say 60-80% of new. If anyone has a possible candidate on hand, I'd be pleased to have it for continued experimentation. Would pay shipping. No other batteries I have on hand present such an opportunity. I might go dig around in the battery bone yards of local shops. Bob . . . ________________________________ Message 4 _____________________________________ Time: 06:23:38 PM PST US Subject: AeroElectric-List: Re: Z-12 questions From: "prestonkavanagh" I'll echo Rick on that one... I'm also planning for a 4-cylinder dual ECU system using SDS components. It would be great to get best thinking. It's clear Bob wants to build us up to think about and know our aircraft, rather than applying a cookbook approach. And I've got a fair amount of load analysis to do before I start ordering parts and running wires. But I hope we see an updated Z-12 before too much longer. Also, I was at SnF yesterday and today. B&C has a great little booth, with a hard copy catalog, components on the tables, and a smart person willing to talk about problems and solutions. My thanks to all for the comments posted above. -------- PBK3 PA-12, BD-4, RV6a, gliders Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488499#488499 ________________________________ Message 5 _____________________________________ Time: 06:49:39 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: re: Z-12 question At 10:55 AM 10/15/2018, you wrote: >Electrical fire requiring the master switch be selected off? > >I also met a C182 that had apparently had a sudden and complete >electrical failure at night but don't know the details. It's >possible it was the typical "not noticing the alternator has failed >until the battery is discharged" but I think all 182s have a warning >light for this. Hard to miss at night and would not be sudden. That's the problem with dark-n-stormy-night stories. We almost NEVER get to interview the pilot, the mechanic who serviced the airplane later, or even the model year of the airplane. Until single engine Cessnas starting getting B&C standby alternators and/or glass cockpits, I don't think there was any active notification of low bus voltage. Just a battery ammeter. Could be wrong, I've been disconnected from details of those aircraft for about 40 years . . . BUT . . . I do have access to a library of service data that would tell us much about how the airplane left the factory. But based on history, I'll suggest that one or more data points figured into the story: *The owner/pilot didn't have a clue as to how long things were supposed to run . . . battery only. *The battery was not periodically cap-checked to verify battery-only endurance goals. *the airplane had no active notification of low voltage. *the ship's most useful electro-whizzies for alternator-out flight were not driven from an source easily isolated from devices of lesser importance. *I'll bet the pilot didn't have hand- held com/nav equipment in the flight bag. Have you read a narrative of the pilot's experience with this event? Bob . . . ________________________________ Message 6 _____________________________________ Time: 06:57:27 PM PST US From: Alec Myers Subject: Re: AeroElectric-List: re: Z-12 question Older single engine Cessnas - 182s included - have an OV voltage trip warning light, but it doesnt indicate an under-voltage. Its easy to miss, for instance, a snapped alternator drive belt. On Apr 3, 2019, at 9:48 PM, Robert L. Nuckolls, III wrote: At 10:55 AM 10/15/2018, you wrote: > Electrical fire requiring the master switch be selected off? > > I also met a C182 that had apparently had a sudden and complete electrical failure at night but don't know the details. It's possible it was the typical "not noticing the alternator has failed until the battery is discharged" but I think all 182s have a warning light for this. Hard to miss at night and would not be sudden. That's the problem with dark-n-stormy-night stories. We almost NEVER get to interview the pilot, the mechanic who serviced the airplane later, or even the model year of the airplane. Until single engine Cessnas starting getting B&C standby alternators and/or glass cockpits, I don't think there was any active notification of low bus voltage. Just a battery ammeter. Could be wrong, I've been disconnected from details of those aircraft for about 40 years . . . BUT . . . I do have access to a library of service data that would tell us much about how the airplane left the factory. But based on history, I'll suggest that one or more data points figured into the story: *The owner/pilot didn't have a clue as to how long things were supposed to run . . . battery only. *The battery was not periodically cap-checked to verify battery-only endurance goals. *the airplane had no active notification of low voltage. *the ship's most useful electro-whizzies for alternator-out flight were not driven from an source easily isolated from devices of lesser importance. *I'll bet the pilot didn't have hand- held com/nav equipment in the flight bag. Have you read a narrative of the pilot's experience with this event? Bob . . . ------------------------------------------------------------------------------------- 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.