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Search: Posts Made By: Mich48041
Forum: RV-12 09-07-2018, 08:39 PM
Replies: 5
Views: 590
Posted By Mich48041
Anyone, even your teenage neighbor, can do...

Anyone, even your teenage neighbor, can do maintenance on an experimental aircraft no matter if it is registered as an E-AB or E-LSA. The advantage of E-LSA is that a new owner can do the annual...
Forum: RV-12 09-06-2018, 11:04 AM
Replies: 13
Views: 2,410
Posted By Mich48041
The trim motor is a completely separate circuit...

The trim motor is a completely separate circuit than the indicator. So no matter how the indicator is wired, it will have no affect on motor operation.
According to Van's schematic:
WHT/ORG is...
Forum: RV-12 09-06-2018, 06:25 AM
Replies: 15
Views: 1,678
Posted By Mich48041
There was a 3 part series by Brian & Carol...

There was a 3 part series by Brian & Carol Carpenter about the Rotax carburetor
in the Jan, Feb & March 2017 issues of Sport Aviation (Experimenter section).
PDF copies can be downloaded from EAA...
Forum: RV-12 09-05-2018, 07:09 PM
Replies: 13
Views: 2,410
Posted By Mich48041
To sglynn, I think that you are correct about...

To sglynn,
I think that you are correct about wires being connected wrong.
Try switching the wht/green and wht/blue wires with each other.
Forum: RV-12 09-01-2018, 08:34 PM
Replies: 4
Views: 510
Posted By Mich48041
Tthere is a very small coax that connects the GPS...

Tthere is a very small coax that connects the GPS data to the ELT. Make sure the center of the coax is not shorted to the shield. And make sure the connector is not shorted to ground.
Forum: Electrical Systems 08-31-2018, 08:24 PM
Replies: 12
Views: 908
Posted By Mich48041
Failure of the master contactor is unlikely. If...

Failure of the master contactor is unlikely. If it does fail, that failure will likely occur during startup, not during cruise. Even if the battery contactor does fail during cruise, the electrical...
Forum: RV-12 08-27-2018, 08:19 PM
Replies: 5
Views: 882
Posted By Mich48041
Fuel tank sealant is not fireproof. It gives off...

Fuel tank sealant is not fireproof. It gives off toxic fumes when burning. And once ignited, keeps burning.
Forum: Electrical Systems 08-27-2018, 11:14 AM
Replies: 14
Views: 759
Posted By Mich48041
If there is a high resistance connection,...

If there is a high resistance connection, avionics with a switching power supply will draw more current to compensate.
Forum: RV-12 08-24-2018, 11:03 AM
Replies: 35
Views: 5,790
Posted By Mich48041
The same paste used on spark plugs can be used. ...

The same paste used on spark plugs can be used. Search for heat or thermal conductive paste.
I found it on Amazon and Home Depot websites. Your local computer store has it for mounting CPUs.
Use...
Forum: RV-12 08-24-2018, 09:54 AM
Replies: 35
Views: 5,790
Posted By Mich48041
Search eBay for AM101406" or "MIA881279" for John...

Search eBay for AM101406" or "MIA881279" for John Deere $20 clone.
If you are in a hurry, NAPA 7068102 for $95.49, but it looks identical to $20 one.
Whatever you buy, mount it using heat conductive...
Forum: RV-12 08-23-2018, 08:49 PM
Replies: 8
Views: 1,035
Posted By Mich48041
LINK...

LINK (http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z16M.pdf) to Bob Nuckolls' drawing.
Forum: RV-12 08-22-2018, 06:04 PM
Replies: 8
Views: 1,035
Posted By Mich48041
RV-12s with the Rotax ULS do not have...

RV-12s with the Rotax ULS do not have over-voltage protection. Luckily it seems that the Ducati Regulator fails with low voltage, not high, at least so far.
Over-voltage protection is mandatory...
Forum: Electrical Systems 08-20-2018, 02:23 PM
Replies: 158
Views: 35,581
Posted By Mich48041
It is unlikely that the battery is the problem. ...

It is unlikely that the battery is the problem. The majority of electrical problems are caused by bad connections.
Take apart every connection in the charging system, clean mating surfaces, and...
Forum: Electrical Systems 08-20-2018, 07:06 AM
Replies: 158
Views: 35,581
Posted By Mich48041
Is 13.8 - 13.9 volts too low?

It depends. There are hundreds of RV-12s flying with a PC-680 battery and a Ducati regulator that puts out 13.8 volts.
That voltage is not a problem even though the battery will be charged slower...
Forum: Electrical Systems 08-15-2018, 06:13 PM
Replies: 17
Views: 2,516
Posted By Mich48041
Assuming that the ammeter will only be measuring...

Assuming that the ammeter will only be measuring the millivolt drop across the shunt and that no current will be flowing,
then resistors (1K ohm?) could be used instead of fuses or fusible links.
Forum: RV-12 08-15-2018, 08:09 AM
Replies: 11
Views: 1,417
Posted By Mich48041
It is not good for the engine to be lugging. The...

It is not good for the engine to be lugging. The prop should be re-pitched.

I would not shut off the electric pump in flight.

If there really is a high fuel flow and not an indication problem,...
Forum: COMM 08-14-2018, 12:04 PM
Replies: 13
Views: 806
Posted By Mich48041
Make sure the headset jacks are mounted with...

Make sure the headset jacks are mounted with insulating shoulder washers, especially the mic jacks.
Forum: RV-12 08-14-2018, 11:40 AM
Replies: 3
Views: 547
Posted By Mich48041
Read THIS...

Read THIS (http://www.vansairforce.com/community/showthread.php?t=86620) thread.
And THIS (http://www.vansairforce.com/community/showthread.php?t=60483) thread.
If the audio feature of a Gamin 396...
Forum: RV-12 08-14-2018, 07:00 AM
Replies: 9
Views: 857
Posted By Mich48041
You might also check with...

You might also check with Catto.
https://www.cattoprops.com/
Forum: RV-12 08-14-2018, 06:55 AM
Replies: 9
Views: 857
Posted By Mich48041
Usually manufactures charge more for their...

Usually manufactures charge more for their products than do their dealers. If that were not the case, then dealers would refuse to sell the manufactures' products. Contact Van's Aircraft about the...
Forum: RV-12 08-09-2018, 05:41 PM
Replies: 3
Views: 695
Posted By Mich48041
Bob, One possible location is behind the baggage...

Bob,
One possible location is behind the baggage compartment. But it will be hard to service there. Another possibility is to mount it above the baggage on the center brace for the roll bar.
Forum: RV-12 08-09-2018, 07:06 AM
Replies: 26
Views: 5,039
Posted By Mich48041
I have contacted Van's Aircraft about the voltage...

I have contacted Van's Aircraft about the voltage regulator wiring. I was told that regulator terminals "C" and "B" are connected together on the RV-12is per Rotax documentation. Face to face...
Forum: RV-12 08-07-2018, 06:28 PM
Replies: 26
Views: 5,039
Posted By Mich48041
Agreed. That is the way that it was wired before...

Agreed. That is the way that it was wired before Eric from Van's suggested that you bypass the master switch and fuse.
The safest way to fix it is to put it back the way it was and replace the...
Forum: RV-12 08-06-2018, 08:06 PM
Replies: 26
Views: 5,039
Posted By Mich48041
The problem with doing that is that the master...

The problem with doing that is that the master switch no longer controls the alternator. If there is smoke in the cockpit, shutting off the master switch will not shut off electrical power. Don't...
Forum: RV-12 08-06-2018, 11:34 AM
Replies: 8
Views: 1,316
Posted By Mich48041
I think that the force against the surface of the...

I think that the force against the surface of the rivet is determined by the breaking point of the rivet stem, aka mandrel. Whatever adjustments are made to the rivet puller should not have much...
Forum: RV-12 08-02-2018, 06:52 PM
Replies: 19
Views: 2,289
Posted By Mich48041
Vic Syracuse made a perfect landing at the...

Vic Syracuse made a perfect landing at the conclusion of the first flight.
Forum: RV-12 08-02-2018, 06:47 PM
Replies: 19
Views: 2,289
Posted By Mich48041
ONE WEEK WONDER

A RV-12is was built in one week at OSH. HERE...
Forum: RV-12 07-10-2018, 09:55 AM
Replies: 20
Views: 1,790
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: 2,196
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: 2,196
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: 707
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: 1,790
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: 7
Views: 835
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: 1,790
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: 1,052
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: 906
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: 1,052
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: 906
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: 3,325
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: 1,052
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: 11
Views: 2,350
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: 463
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: 1,065
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: 2,243
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: 44
Views: 3,787
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: 748
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: 748
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: 748
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: 44
Views: 3,787
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: 748
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: 44
Views: 3,787
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: 44
Views: 3,787
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: 44
Views: 3,787
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: 44
Views: 3,787
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: 44
Views: 3,787
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: 1,279
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: 2,285
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: 2,655
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: 2,860
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: 1,463
Posted By Mich48041
Good going Darren.

Good going Darren.
Forum: RV-12 06-03-2018, 06:24 AM
Replies: 13
Views: 1,463
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: 1,463
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...
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