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Search: Posts Made By: Mich48041
Forum: RV-12 07-10-2018, 09:55 AM
Replies: 20
Views: 1,342
Posted By Mich48041
The fuel pressure senders are notoriously...

The fuel pressure senders are notoriously inaccurate. The actual numerical value of the pressure is meaningless and will vary both in my plane and in other planes. Pressure drop is directly...
Forum: RV-12 07-09-2018, 06:02 PM
Replies: 15
Views: 1,643
Posted By Mich48041
I did a google search for "syringe vansairforce...

I did a google search for "syringe vansairforce geico" without quotes and found THIS (http://www.vansairforce.com/community/showthread.php?t=93338) thread. Larry mentioned Superfil.
Forum: RV-12 07-09-2018, 05:57 PM
Replies: 15
Views: 1,643
Posted By Mich48041
I remember that he used a syringe. I do not...

I remember that he used a syringe. I do not remember what was in it.
Forum: Electrical Systems 07-09-2018, 04:45 PM
Replies: 3
Views: 447
Posted By Mich48041
A 60 amp ANL current limiter will conduct well...

A 60 amp ANL current limiter will conduct well over 60 amps indefinitely without blowing. See the chart on the DATASHEET...
Forum: RV-12 07-09-2018, 04:00 PM
Replies: 20
Views: 1,342
Posted By Mich48041
Hi Dick, I still have the original fuel pressure...

Hi Dick,
I still have the original fuel pressure sender.
Exactly what information are you looking for? If you are looking for a 5 volt source, it is available at the manifold pressure sensor,...
Forum: Electrical Systems 07-08-2018, 08:33 PM
Replies: 5
Views: 427
Posted By Mich48041
It is not a good idea to put a fuse in series...

It is not a good idea to put a fuse in series with a circuit breaker. Even a much larger fuse is likely to blow before a circuit breaker trips.
None of Bob Nuckolls' electrical drawings have a...
Forum: RV-12 07-08-2018, 06:03 PM
Replies: 20
Views: 1,342
Posted By Mich48041
Turn on electric pump (master switch) and note...

Turn on electric pump (master switch) and note fuel pressure.
Start engine and look for increase in fuel pressure.
Now you know that both pumps are working.
Forum: RV-12 07-06-2018, 11:11 AM
Replies: 5
Views: 775
Posted By Mich48041
Keith, You have the best idea. Replace the...

Keith,
You have the best idea. Replace the contactor.
Forum: Electrical Systems 07-06-2018, 07:22 AM
Replies: 8
Views: 561
Posted By Mich48041
Van's description says, "Needs +12v to energize"....

Van's description says, "Needs +12v to energize". That means that the coil is not getting positive 12 volts internally. Therefore it does not matter which large terminal connects to the battery or...
Forum: RV-12 07-04-2018, 03:35 PM
Replies: 5
Views: 775
Posted By Mich48041
Yes, that would be a good test to determine if...

Yes, that would be a good test to determine if the master contactor is sticking closed or if the master switch is not opening. Another possibility is that the WHT/ORG wire between the contactor and...
Forum: Electrical Systems 07-04-2018, 11:50 AM
Replies: 8
Views: 561
Posted By Mich48041
It all depends on how the starter contactor coil...

It all depends on how the starter contactor coil is connected. If the contactor has two small coil terminals, then yes, no problem. Connect the large cable terminals either way. If your contactor...
Forum: RV-12 07-04-2018, 11:26 AM
Replies: 15
Views: 2,853
Posted By Mich48041
The original rear window was made of...

The original rear window was made of polycarbonate. Acrylic and Plexiglas are the same thing. Plexiglas is a brand name. I believe that the canopy and rear window are now both acrylic.
Forum: RV-12 07-03-2018, 04:03 PM
Replies: 5
Views: 775
Posted By Mich48041
One possibility is that the master contactor is...

One possibility is that the master contactor is sticking closed after power is removed from the coil. It takes a strong magnetic force to pull in a relay or contactor. Once pulled in, very little...
Forum: RV-12 06-24-2018, 08:23 AM
Replies: 9
Views: 1,263
Posted By Mich48041
Don, I could not find the post that you are...

Don,
I could not find the post that you are looking for but here are a couple of links to other methods of jacking up the RV-12. I use the two saw horse method.
How to Jack up the RV-12...
Forum: Electrical Systems 06-23-2018, 08:47 PM
Replies: 2
Views: 352
Posted By Mich48041
The RV-12 uses fuse holder part number F-12123A. ...

The RV-12 uses fuse holder part number F-12123A. You could call them an ask for it.
Forum: Electrical Systems 06-21-2018, 09:30 AM
Replies: 18
Views: 719
Posted By Mich48041
A person might want to reduce the energy...

A person might want to reduce the energy consumption for some reason, for instance: a very small alternator, or to reduce heat, or to conserve the battery when the alternator fails. There are ways...
Forum: RV-12 06-16-2018, 08:59 PM
Replies: 10
Views: 1,620
Posted By Mich48041
I once climbed up very high crossing water to be...

I once climbed up very high crossing water to be within gliding distance of shore. There was a 50 knot cross wind according to the D-180. My RV-12 flew just fine. It thought the air was calm. But...
Forum: Electrical Systems 06-14-2018, 04:29 PM
Replies: 41
Views: 2,315
Posted By Mich48041
Stalled starter current is greater than turning...

Stalled starter current is greater than turning current because there is no back EMF. That is why lights dim when motors start.
A stalled motor is a fixed resistance (but will increase slightly as...
Forum: Electrical Systems 06-14-2018, 10:59 AM
Replies: 8
Views: 516
Posted By Mich48041
Charles, there are lots of people who are...

Charles, there are lots of people who are knowledgeable about electrical systems on the AEROELECTRIC LIST (http://forums.matronics.com/viewforum.php?f=3). Try posting your question there.
Forum: Electrical Systems 06-14-2018, 10:00 AM
Replies: 8
Views: 516
Posted By Mich48041
If internally regulated, then the alternator most...

If internally regulated, then the alternator most likely it needs 12 volts to be enabled. The wire supplying that 12 volts should be protected by a fuse or circuit breaker. And there should be a...
Forum: Electrical Systems 06-14-2018, 06:32 AM
Replies: 8
Views: 516
Posted By Mich48041
It doesn't matter if the regulator is internal or...

It doesn't matter if the regulator is internal or external. A fuse or circuit breaker should be installed to protect that circuit. There should also be a switch to shut the alternator off in case...
Forum: Electrical Systems 06-14-2018, 05:31 AM
Replies: 41
Views: 2,315
Posted By Mich48041
The starter contactor in most airplanes is...

The starter contactor in most airplanes is energized by a switch that gets positive voltage from a fused source. If the wire shorts to ground, the fuse blows and no harm is done. Wiring the starter...
Forum: Electrical Systems 06-13-2018, 08:45 PM
Replies: 8
Views: 516
Posted By Mich48041
A google search turned up...

A google search turned up these:
http://repair-manuals.blogspot.com/2013/11/hitachi-alternators-1963-74-models.html
-
http://s7d9.scene7.com/is/content/GenuinePartsCompany/1704040pdf
-
I interpret...
Forum: Electrical Systems 06-13-2018, 08:25 PM
Replies: 41
Views: 2,315
Posted By Mich48041
Bob N commented on the starter voltage spike myth...

Bob N commented on the starter voltage spike myth HERE (http://forums.matronics.com/viewtopic.php?t=16769915).
Forum: Electrical Systems 06-13-2018, 08:07 PM
Replies: 41
Views: 2,315
Posted By Mich48041
If the battery is so weak that it can not hold...

If the battery is so weak that it can not hold the master contactor closed (less than 1/2 amp), then how can the battery send hundreds of amps to the starter motor?
Forum: Electrical Systems 06-13-2018, 11:13 AM
Replies: 41
Views: 2,315
Posted By Mich48041
I agree with you, Charlie. I wish that I knew as...

I agree with you, Charlie. I wish that I knew as much as Bob Nuckolls. He is so respected in his field that he has been called to testify in court as an expert witness. He backs up his assertions...
Forum: Electrical Systems 06-13-2018, 08:42 AM
Replies: 41
Views: 2,315
Posted By Mich48041
Cumulo, that is a very interesting scenario. But...

Cumulo, that is a very interesting scenario. But why does the master contactor drop out before the starter contactor? I assumed, maybe incorrectly, that the starter contactor has a stronger spring...
Forum: Electrical Systems 06-12-2018, 06:09 AM
Replies: 41
Views: 2,315
Posted By Mich48041
Bob Nuckolls posted, "Some ol' hangar tales just...

Bob Nuckolls posted, "Some ol' hangar tales just never die. . . . . The 'cranking spike' thingy doesn't exist."
Read his complete post HERE (http://forums.matronics.com/viewtopic.php?p=479101#479101).
Forum: Electrical Systems 06-11-2018, 07:26 AM
Replies: 12
Views: 927
Posted By Mich48041
The engine mount should NOT be used to carry...

The engine mount should NOT be used to carry electrical current. There is nothing wrong with grounding the engine mount, but a ground strap or copper cable should connect the engine to firewall. If...
Forum: RV General Discussion/News 06-07-2018, 07:51 AM
Replies: 36
Views: 1,763
Posted By Mich48041
Make sure the sender plate is well grounded by...

Make sure the sender plate is well grounded by connecting a ground wire to the plate. I am assuming the sender is the float type with potentiometer and round mounting plate.
Forum: RV-12 06-06-2018, 08:48 AM
Replies: 12
Views: 2,228
Posted By Mich48041
Do not turn the prop fast. Turn it slowly until...

Do not turn the prop fast. Turn it slowly until at the top of a compression stroke, then pause for a few seconds, then repeat, pausing at the top of each compression stroke. The pause gives time...
Forum: RV-12 06-04-2018, 08:14 PM
Replies: 21
Views: 2,484
Posted By Mich48041
In case of an imminent forced landing, all...

In case of an imminent forced landing, all electrical power should be shut off as close to the source (battery) as possible. An accident investigator once made the comment that if the battery is...
Forum: RV-12 06-03-2018, 12:05 PM
Replies: 13
Views: 1,242
Posted By Mich48041
Good going Darren.

Good going Darren.
Forum: RV-12 06-03-2018, 06:24 AM
Replies: 13
Views: 1,242
Posted By Mich48041
Troubleshooting ideas

Short circuit tester:
Method 1.
Cut apart a blown fuse to get the two spade connectors. Solder a wire about one meter long to each spade. Plug the spades into the RV-12 fuse holder. Connect the...
Forum: RV-12 06-02-2018, 11:37 AM
Replies: 13
Views: 1,242
Posted By Mich48041
Hundreds of RV-12s are flying with 3 amp start...

Hundreds of RV-12s are flying with 3 amp start fuses. If I remember right, originally that fuse was 2 amp but was upped to 3 amp when the 2 amp occasionally blew.
Try disconnecting the small...
Forum: Electrical Systems 06-01-2018, 06:44 PM
Replies: 21
Views: 1,783
Posted By Mich48041
There are several ways to accomplish your goal. ...

There are several ways to accomplish your goal. No mater what you do, a knowledgeable person can defeat it. I do not know what a large circuit breaker will do except blow when you try to start the...
Forum: RV-12 05-30-2018, 11:19 AM
Replies: 7
Views: 906
Posted By Mich48041
There are no pictures. Instead are what looks...

There are no pictures. Instead are what looks like international Do Not Enter Traffic Signs.
Forum: Electrical Systems 05-30-2018, 06:31 AM
Replies: 261
Views: 14,799
Posted By Mich48041
Yes. Normally open contacts are held tightly...

Yes. Normally open contacts are held tightly together by a strong
electromagnet. Normally closed contacts depend on a spring to hold them
together. The spring is not very strong compared to an...
Forum: Electrical Systems 05-30-2018, 06:20 AM
Replies: 261
Views: 14,799
Posted By Mich48041
George wrote, I took a Busman fuse block apart...

George wrote, I took a Busman fuse block apart with the intent of
modifying it so that it could be fed power at both ends for redundancy. While it
was apart, I noticed that the fuse clips do not...
Forum: RV-12 05-29-2018, 08:50 PM
Replies: 3
Views: 836
Posted By Mich48041
Others with the same problem have attributed it...

Others with the same problem have attributed it to either vapor lock or bad engine driven fuel pump.
Forum: RV-12 05-26-2018, 04:44 PM
Replies: 10
Views: 1,505
Posted By Mich48041
Dynon support might not want to give you an...

Dynon support might not want to give you an unlock code without Van's OK. If that is the case, you could call Van's, explain why you want the D-180 unlocked, and ask them to give Dynon the OK to...
Forum: Electrical Systems 05-26-2018, 08:47 AM
Replies: 261
Views: 14,799
Posted By Mich48041
If that one switch fails, the engine quits. On...

If that one switch fails, the engine quits. On the other hand, if there are two
electrical supply paths and one fails, there is a back up path.
There are two fuel pumps. If one fails, there is a...
Forum: RV-12 05-25-2018, 11:31 AM
Replies: 22
Views: 2,914
Posted By Mich48041
Bob Nuckolls commented on the fuel pump fuse...

Bob Nuckolls commented on the fuel pump fuse blowing HERE (http://forums.matronics.com/viewtopic.php?t=16769786).
This is my interpretation of what he posted:
The solenoid coil that drives the pump...
Forum: Electrical Systems 05-25-2018, 06:25 AM
Replies: 261
Views: 14,799
Posted By Mich48041
If left contactor coil fails open, the engine...

If left contactor coil fails open, the engine stops.
The panicked pilot can not remember how he wired it long ago.
Flipping left switch off is not intuitive for another pilot who is not the builder.
Forum: RV-12 05-23-2018, 07:07 PM
Replies: 22
Views: 2,914
Posted By Mich48041
I conducted an experiment today on my RV-12. Not...

I conducted an experiment today on my RV-12. Not wanting to ruin the PC680 aircraft battery, I disconnected it. In its place, I used the riding lawn mower battery connected with jumper cables. I...
Forum: Electrical Systems 05-22-2018, 08:02 PM
Replies: 261
Views: 14,799
Posted By Mich48041
My 6-year-old PC680 failed open with an internal...

My 6-year-old PC680 failed open with an internal broken weld. You can read about it here:
http://www.matronics.com/forums/viewtopic.php?p=458468&sid=e9e8d09021e1ecd6ac4fa1960b22b54f
At first it was...
Forum: RV-12 05-22-2018, 07:01 AM
Replies: 22
Views: 2,914
Posted By Mich48041
hthaman, did a new battery cure the fuel pump...

hthaman, did a new battery cure the fuel pump fuse blowing problem?
Forum: Electrical Systems 05-21-2018, 02:31 PM
Replies: 5
Views: 704
Posted By Mich48041
Yes, Van's "LIT" fuses have a built-in resistor...

Yes, Van's "LIT" fuses have a built-in resistor in series with the LED. Like Bob said, if use a separate LED, a resistor is required. To get the maximum brightness without damaging the LED, the...
Forum: Electrical Systems 05-21-2018, 06:59 AM
Replies: 5
Views: 704
Posted By Mich48041
Van's sells fuses with built in LEDs. Look in...

Van's sells fuses with built in LEDs. Look in their "The List".
ES-00203 FUSE ATC 3 AMP LIT $1.25
ES-00205 FUSE ATC 5 AMP LIT $1.00
ES-00207 FUSE ATC 7.5 AMP LIT $1.00
ES-00210 FUSE ATC 10...
Forum: RV-12 05-20-2018, 05:52 PM
Replies: 22
Views: 2,914
Posted By Mich48041
The pump was pumping gasoline, albeit out of a...

The pump was pumping gasoline, albeit out of a can and right back in. You are right, simulating the conditions with a weak battery would be a better test.
Forum: RV-12 05-20-2018, 02:08 PM
Replies: 22
Views: 2,914
Posted By Mich48041
Electrical loads that have a switching power...

Electrical loads that have a switching power supply will draw less current as the voltage goes up and will draw more current as the voltage goes down. Examples are modern avionics that are designed...
Forum: RV-12 05-19-2018, 10:28 PM
Replies: 7
Views: 1,475
Posted By Mich48041
I'm with you Charlie.

I'm with you Charlie.
Forum: RV-12 05-19-2018, 07:33 PM
Replies: 22
Views: 2,914
Posted By Mich48041
Check all battery and starter cables and...

Check all battery and starter cables and connections, both positive and negative.
What size fuse is blowing, 5 amps?
It is strange that the fuel pump fuse would blow unless the pump draws more...
Forum: Electrical Systems 05-17-2018, 05:28 PM
Replies: 41
Views: 2,315
Posted By Mich48041
Diodes limit inductor induced voltage to about 1...

Diodes limit inductor induced voltage to about 1 volt.
Forum: Electrical Systems 05-17-2018, 11:34 AM
Replies: 41
Views: 2,315
Posted By Mich48041
The 1N5406 diode should work fine. When the...

The 1N5406 diode should work fine. When the controlling switch is opened, the polarity of the coil induced voltage is such that the diode will be forward biased and conduct any induced current. The...
Forum: Electrical Systems 05-15-2018, 10:52 AM
Replies: 2
Views: 320
Posted By Mich48041
The 3 wire sensor is probably a thermistor and a...

The 3 wire sensor is probably a thermistor and a resistor which only cost a couple of dollars. The problem with making your own temperature sensor is finding thermistor with the correct...
Forum: Electrical Systems 05-10-2018, 11:33 AM
Replies: 261
Views: 14,799
Posted By Mich48041
Cliff, what your automotive electrical designer...

Cliff, what your automotive electrical designer said about parallel diodes and etc is true. However, from what you wrote, it seems that he was trying to share the load between two parallel devices,...
Forum: Electrical Systems 05-07-2018, 05:50 PM
Replies: 261
Views: 14,799
Posted By Mich48041
That diode will be one of the most reliable...

That diode will be one of the most reliable things on your airplane. Mount it to an aluminum surface with heat conductive paste. If kept cool and protected against excessive current, it will likely...
Forum: Electrical Systems 05-07-2018, 10:49 AM
Replies: 41
Views: 2,029
Posted By Mich48041
Carl, Thanks for your comments. I agree with...

Carl,
Thanks for your comments. I agree with you. Yes, the purpose of the small battery is for preventing brownout during engine cranking. The circuit is not for me but for those who want a...
Forum: Electrical Systems 05-07-2018, 08:54 AM
Replies: 41
Views: 2,029
Posted By Mich48041
I modified my schematic for using a Lithium Aux...

I modified my schematic for using a Lithium Aux battery. A Schottky diode in
series with the aux battery will reduce charging voltage by 0.4 to 0.75 volts
depending on charging current (0 to 40...
Forum: RV-12 05-06-2018, 06:30 AM
Replies: 11
Views: 1,686
Posted By Mich48041
Is this a good idea? Plug the end of the fuel...

Is this a good idea? Plug the end of the fuel pump drain with Styrofoam. If the Styrofoam melts, that means that gasoline is leaking from the pump.
Forum: Electrical Systems 05-05-2018, 06:43 PM
Replies: 41
Views: 2,029
Posted By Mich48041
Walt, I see nothing dangerous about my aux...

Walt, I see nothing dangerous about my aux battery circuit posted above.
There is a fuse at each end of the wire that connects
the E-Bus and Aux battery. If the current gets too high, a fuse
will...
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