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Search: Posts Made By: Mich48041
Forum: Electrical Systems Today, 07:55 AM
Replies: 2
Views: 155
Posted By Mich48041
What if a pot is connected in series with either...

What if a pot is connected in series with either the red or white wire, which ever one that you want to be more dimmer than the other? The PWM current through the black wire will dim both red and...
Forum: RV-12/RV-12iS Today, 06:48 AM
Replies: 2
Views: 236
Posted By Mich48041
The part number for the RV-12 gascolator is...

The part number for the RV-12 gascolator is GAS-5

Description _ _ _ _ _ _ _ _ _ _ _Part Number _ _ _ _ _ Price
O Ring Gasket GAS 3,4,5 _ _GAS-3-4-5 GASKET _ _ _ $1.00
Screen for GAS 3,4,5 _ _ _...
Forum: Electrical Systems 05-18-2019, 06:24 AM
Replies: 10
Views: 1,270
Posted By Mich48041
One way to damage expensive avionics is by...

One way to damage expensive avionics is by reversing battery polarity. This is easy to do if using jumper cables to temporarily test the electrical system.
Forum: RV-12/RV-12iS 05-10-2019, 06:23 PM
Replies: 3
Views: 245
Posted By Mich48041
Shutting off avionics to reduce the load on the...

Shutting off avionics to reduce the load on the battery during starting is not a valid reason. Adding 10 amps to hundreds of amps of starting current is not going to make any difference unless the...
Forum: Electrical Systems 05-10-2019, 05:59 PM
Replies: 17
Views: 1,128
Posted By Mich48041
Fuses should not be connected in parallel because...

Fuses should not be connected in parallel because current will not be divided equally between the two fuses due to resistance variations in the wire and terminals and in the fuses themselves. The...
Forum: RV-12/RV-12iS 05-10-2019, 05:41 PM
Replies: 3
Views: 245
Posted By Mich48041
It is not a typo, but it is a mistake. Shutting...

It is not a typo, but it is a mistake. Shutting off the avionics was a good idea back in the 1950s shortly after transistors were first invented. The voltage sag during engine cranking destroyed...
Forum: RV-12/RV-12iS 05-10-2019, 11:26 AM
Replies: 7
Views: 485
Posted By Mich48041
Assuming your fuel pressure sensor has 3 wires,...

Assuming your fuel pressure sensor has 3 wires, the red one should have 5 vdc. The black wire is ground.
Measure between the black and red wires to be sure that there is 5 volts.
The green wire is...
Forum: RV-12/RV-12iS 05-08-2019, 08:27 PM
Replies: 7
Views: 485
Posted By Mich48041
Check the fuel level sensor ground. There should...

Check the fuel level sensor ground. There should be electrical continuity between the sensor mounting plate and the airframe.
Edit: Oops, I was thinking fuel level, not pressure. Sorry
Forum: Electrical Systems 05-08-2019, 07:07 AM
Replies: 6
Views: 486
Posted By Mich48041
Mark the tool somehow so that you can tell when...

Mark the tool somehow so that you can tell when it is fully inserted. I pull on the wire only. If it does not come out easily, I remove the tool, rotate it slightly and try again.
Forum: Electrical Systems 05-06-2019, 02:34 PM
Replies: 10
Views: 1,270
Posted By Mich48041
The banded end of arc suppression diodes always...

The banded end of arc suppression diodes always connects to the positive terminal.
Forum: RV-12/RV-12iS 05-06-2019, 02:24 PM
Replies: 102
Views: 26,420
Posted By Mich48041
TygonŽ F-4040-A Fuel & Lubricant Tubing $22 for...

TygonŽ F-4040-A Fuel & Lubricant Tubing $22 for 10 foot length.
https://www.usplastic.com/catalog/item.aspx?itemid=23487&catid=579
Forum: RV-12/RV-12iS 05-06-2019, 02:12 PM
Replies: 4
Views: 746
Posted By Mich48041
How about suction cups made for lifting glass? ...

How about suction cups made for lifting glass? Harbor Freight and home improvement stores sell them.
Both single and dual cups are...
Forum: RV-12/RV-12iS 05-03-2019, 05:42 PM
Replies: 3
Views: 463
Posted By Mich48041
Are you talking about D-Sub pins? If so, there...

Are you talking about D-Sub pins? If so, there is a Red/White Tool (https://www.computercablestore.com/content/images/thumbs/0003471_d-sub-pin-insertion-and-extraction-tool_400.jpeg) available from...
Forum: RV-12/RV-12iS 05-02-2019, 11:08 AM
Replies: 6
Views: 643
Posted By Mich48041
I agree with John-G. There is no cause for...

I agree with John-G. There is no cause for concern. What is the voltage and current at 4000 and 5000 RPM? 13.8 volts or higher is normal above 4000 RPM.
Forum: Electrical Systems 05-01-2019, 10:47 AM
Replies: 17
Views: 596
Posted By Mich48041
Nobody can attach a picture on VansAirforce. Any...

Nobody can attach a picture on VansAirforce. Any picture that you see is posted on some other website. A link to the picture is posted on VansAirforce using the yellow picture icon.
Forum: Electrical Systems 04-30-2019, 09:00 PM
Replies: 17
Views: 596
Posted By Mich48041
A bad connection will drop voltage. A voltage...

A bad connection will drop voltage. A voltage drop can cause a switching power supply to draw more current. Increased current will cause the bad connection to get even hotter. Replace the switch...
Forum: RV-12/RV-12iS 04-29-2019, 06:54 AM
Replies: 8
Views: 2,044
Posted By Mich48041
Headset jacks and mic jacks and music jacks...

Headset jacks and mic jacks and music jacks should be mounted with insulating step washers so that the jacks do not touch the aluminum mounting surface.
Forum: RV-12/RV-12iS 04-27-2019, 07:44 AM
Replies: 7
Views: 913
Posted By Mich48041
A maximum high temperature of 63 degrees C was...

A maximum high temperature of 63 degrees C was measured by a thermocouple attached to a mounting bolt of the voltage regulator which is located on the firewall shelf inside of the engine compartment....
Forum: Electrical Systems 04-24-2019, 08:24 PM
Replies: 7
Views: 704
Posted By Mich48041
Yes, as long as the diode polarity is correctly...

Yes, as long as the diode polarity is correctly marked with that red band.
Forum: RV-12/RV-12iS 04-24-2019, 08:19 PM
Replies: 14
Views: 1,063
Posted By Mich48041
Also consider coin-size battery-operated quartz...

Also consider coin-size battery-operated quartz clocks and quartz pocket watches, that is if you want a clock with hands. There are also battery operated digital clocks.
Forum: RV-12/RV-12iS 04-24-2019, 11:27 AM
Replies: 17
Views: 1,348
Posted By Mich48041
https://www.vansaircraft.com/wp-content/uploads/20...

https://www.vansaircraft.com/wp-content/uploads/2019/02/RV-12_MM-notes.pdf
Bottom of page 1.
Forum: RV-12/RV-12iS 04-24-2019, 05:52 AM
Replies: 14
Views: 1,063
Posted By Mich48041
If your RV-12 has the original 5 amp power outlet...

If your RV-12 has the original 5 amp power outlet inline fuse connected to the battery, then tap into that circuit with the clock's red wire. If not, install a new inline fuse holder to the battery...
Forum: Electrical Systems 04-23-2019, 06:18 PM
Replies: 9
Views: 517
Posted By Mich48041
What is electrical system voltage during...

What is electrical system voltage during cruise?
If it fluctuates, what is the minimum and maximum?
Forum: Electrical Systems 04-22-2019, 11:16 AM
Replies: 7
Views: 704
Posted By Mich48041
A diode connected in parallel with a start...

A diode connected in parallel with a start contactor coil will short out induced voltage spikes, thus protecting switch contacts from arcing and sparking.
Forum: Electrical Systems 04-21-2019, 05:16 PM
Replies: 24
Views: 1,629
Posted By Mich48041
My 6-year-old PC680 failed while flying. I did...

My 6-year-old PC680 failed while flying. I did not notice anything amiss until closing the throttle for landing. Then the Dynon D-180 rebooted. Another symptom was unstable voltage: plus and minus...
Forum: RV-12/RV-12iS 04-21-2019, 11:18 AM
Replies: 10
Views: 950
Posted By Mich48041
Pitch Trim Potentiometer _ 5VDC: EMS-220 pin 18,...

Pitch Trim Potentiometer
_
5VDC: EMS-220 pin 18, AV-50000A EFIS pin 50, AV-50000A Fuselage pin 22
_
Signal: EMS-220 pin 23, AV-50000A EFIS pin 30, AV-50000A Fuselage pin 4
_
GND: AV-50000A Fuselage...
Forum: RV-12/RV-12iS 04-13-2019, 09:04 AM
Replies: 4
Views: 614
Posted By Mich48041
A 24 hour test is not necessary. The pressure...

A 24 hour test is not necessary. The pressure will fluctuate as atmospheric pressure changes over time. That change might lead one to believe there is a leak when there is none.
Forum: RV-12/RV-12iS 04-11-2019, 07:26 AM
Replies: 8
Views: 708
Posted By Mich48041
In order to register as E-LSA, Vans Aircraft...

In order to register as E-LSA, Vans Aircraft needs to fill out and sign and give to you FAA
Form 8130-15 "Light-Sport Statement of Compliance". Vans will not provide that form
unless you buy every...
Forum: RV-12/RV-12iS 04-09-2019, 09:07 PM
Replies: 15
Views: 1,541
Posted By Mich48041
Regardless of what the ammeter says, if...

Regardless of what the ammeter says, if electrical system voltage is 13 or
greater, the battery is not being discharged. If system voltage is 13.8 or
greater, the battery is being charged.
Forum: RV-12/RV-12iS 04-09-2019, 11:39 AM
Replies: 135
Views: 15,803
Posted By Mich48041
Jim, Your reasoning is correct. But just because...

Jim, Your reasoning is correct. But just because the Marvel Schebler floats are
heavier does not mean that the fuel level is higher. The volume (density) and
shape of the floats must also be...
Forum: RV-12/RV-12iS 04-09-2019, 11:19 AM
Replies: 15
Views: 1,541
Posted By Mich48041
The answer is both. It all depends on which...

The answer is both. It all depends on which version of the control board you have. The original D-180
control board did not have a fuse. In that case a short circuit caused a circuit trace to burn...
Forum: RV-12/RV-12iS 04-09-2019, 07:11 AM
Replies: 135
Views: 15,803
Posted By Mich48041
The important characteristic of floats is...

The important characteristic of floats is buoyancy, not weight. If volume
remains constant, then buoyancy can be determined by measuring weight.
However, reducing volume will also reduce...
Forum: RV-12/RV-12iS 04-08-2019, 11:41 AM
Replies: 15
Views: 1,541
Posted By Mich48041
I never thought to read between the lines like...

I never thought to read between the lines like Mike Miller did. So is the problem actually a low voltage problem and not an ammeter problem?
If so and this RV-12 has Van's original control board,...
Forum: RV-12/RV-12iS 04-08-2019, 07:33 AM
Replies: 15
Views: 1,541
Posted By Mich48041
Assuming that you have Dynon avionics,...

Assuming that you have Dynon avionics, interchange the two wires going to
EMS pins 24 and 25. Like BigJohn said, switching other wires could cause big
problems. What is the voltage? If less...
Forum: Electrical Systems 04-05-2019, 08:11 PM
Replies: 51
Views: 4,272
Posted By Mich48041
Doug Mattson, you are right. However, the...

Doug Mattson, you are right. However, the voltage could be unstable.
Forum: Electrical Systems 04-05-2019, 01:09 PM
Replies: 51
Views: 4,272
Posted By Mich48041
You are correct that one cable is redundant. ...

You are correct that one cable is redundant. However, the O.P. wanted a symmetrical layout.
One of the batteries and one of the contactors are also redundant.
Some builders want a fail-safe...
Forum: Electrical Systems 04-04-2019, 03:36 PM
Replies: 51
Views: 4,272
Posted By Mich48041
I replaced Google photo with Shutterfly photo. ...

I replaced Google photo with Shutterfly photo. Can you see it now?
https://uniim1.shutterfly.com/ng/services/mediarender/THISLIFE/000038327418/media/74506047506/medium/1554393285/enhance
Forum: Electrical Systems 04-04-2019, 11:45 AM
Replies: 51
Views: 4,272
Posted By Mich48041
Below is a picture of a symmetrical dual-battery...

Below is a picture of a symmetrical dual-battery electrical system that really is simple.
It is up to the builder-installer to make absolutely sure that there is no
chance of a short circuit of the...
Forum: Electrical Systems 04-03-2019, 08:09 AM
Replies: 15
Views: 1,344
Posted By Mich48041
Check all ground wires on the whole aircraft for...

Check all ground wires on the whole aircraft for good terminations.
Make sure that the audio and mic jacks are mounted with insulating
step washers so that the jacks do not touch the airframe.
Quote...
Forum: Electrical Systems 04-02-2019, 08:48 AM
Replies: 51
Views: 4,272
Posted By Mich48041
There is a flaw in the schematic. The diodes...

There is a flaw in the schematic. The diodes prevent the small relays from energizing.
Forum: RV-12/RV-12iS 03-26-2019, 08:11 PM
Replies: 14
Views: 2,220
Posted By Mich48041
In order to register as E-LSA, you must get form...

In order to register as E-LSA, you must get form "8130-15 Light Sport Aircraft
Statement of Compliance" from Van's Aircraft. You need to talk with Van's to
see if they will issue that completed form...
Forum: RV-12/RV-12iS 03-25-2019, 07:30 AM
Replies: 34
Views: 6,925
Posted By Mich48041
You could buy several 1/2 watt resistors ranging...

You could buy several 1/2 watt resistors ranging in value between 1 ohm and
15 ohms. Set Van's trim pot to the center of its range. Using trial and error,
put one of the resistors in series with...
Forum: RV-12/RV-12iS 03-24-2019, 08:38 PM
Replies: 10
Views: 1,331
Posted By Mich48041
Verify the oil temperature via some other means. ...

Verify the oil temperature via some other means. How about removing the dip
stick and inserting a thermometer or temperature probe in its place?
Forum: RV-12/RV-12iS 03-19-2019, 06:57 PM
Replies: 13
Views: 2,333
Posted By Mich48041
If the voltage on terminal C is OK, then the...

If the voltage on terminal C is OK, then the problem is most likely within the voltage regulator.
The master switch is not the problem.
Read THIS...
Forum: RV-12/RV-12iS 03-19-2019, 05:38 PM
Replies: 13
Views: 2,333
Posted By Mich48041
Check the voltage on regulator terminal "C". It...

Check the voltage on regulator terminal "C". It should equal battery voltage.
Forum: Electrical Systems 03-17-2019, 08:57 PM
Replies: 14
Views: 1,151
Posted By Mich48041
With the engine not running and the master switch...

With the engine not running and the master switch turned on and alternator field switch turned on, measure the voltage drop between the main power bus and the alternator field terminal (if there is...
Forum: RV-12/RV-12iS 03-17-2019, 03:26 PM
Replies: 49
Views: 15,912
Posted By Mich48041
I have not observed any benefit to adding a large...

I have not observed any benefit to adding a large capacitor to the output of an alternator.
The ability of 22,000 mfd capacitors to store and release electrons is very
small compared to the output...
Forum: RV-12/RV-12iS 03-17-2019, 03:58 AM
Replies: 50
Views: 3,771
Posted By Mich48041
Search Aircraft Spruce for "12-01467". The...

Search Aircraft Spruce for "12-01467". The DIMPLE DIE SET is used with a hand rivet squeezer.
The good news is that you do not need a $500 dimpling machine.
The bad news is that it will still cost...
Forum: RV-12/RV-12iS 03-15-2019, 09:01 PM
Replies: 15
Views: 1,580
Posted By Mich48041
Here is an easy test for the ground: With every...

Here is an easy test for the ground:
With every electrical load turned on including something plugged into the power
outlet, measure the voltage drop between the battery negative terminal and the...
Forum: RV-12/RV-12iS 03-15-2019, 01:06 PM
Replies: 8
Views: 861
Posted By Mich48041
I can see your picture on Google's website, but I...

I can see your picture on Google's website, but I can not get your picture to
post here either. The problem might be at Google's end. Try storing your
picture on some other website, maybe...
Forum: Electrical Systems 03-15-2019, 12:12 PM
Replies: 22
Views: 2,523
Posted By Mich48041
IBBS = Integrated Backup Battery System Sold by...

IBBS = Integrated Backup Battery System
Sold by https://www.tcwtech.com
Forum: RV-12/RV-12iS 03-15-2019, 11:56 AM
Replies: 15
Views: 1,580
Posted By Mich48041
Are the audio jacks physically isolated from the...

Are the audio jacks physically isolated from the the airframe with insulating step washers?
Ground the voltage regulator case to the airframe with a heavy wire.
If music jacks are installed,...
Forum: RV-12/RV-12iS 03-14-2019, 06:46 AM
Replies: 29
Views: 3,620
Posted By Mich48041
You can NOT register that RV-12 as E-LSA unless...

You can NOT register that RV-12 as E-LSA unless Van's Aircraft gives you form 8130-15. Van's will ask you to sign this statement:
_
"To receive the documentation required to license and fly an E-LSA...
Forum: Electrical Systems 03-13-2019, 07:35 AM
Replies: 57
Views: 4,937
Posted By Mich48041
I agree with Charlie. The fact that the voltage...

I agree with Charlie. The fact that the voltage is being reduced by a factor of
10, 120 down to 12, automatically reduces the rating. The switch carries 1/10
of the power (volts times amps). The...
Forum: RV-12/RV-12iS 03-12-2019, 05:27 PM
Replies: 4
Views: 780
Posted By Mich48041
Another test: Pull the control stick firmly full...

Another test:
Pull the control stick firmly full aft and hold. There should be no up-down play in the elevator.
Then push the control stick firmly full forward and hold. There should be no up-down...
Forum: RV-12/RV-12iS 03-10-2019, 07:34 AM
Replies: 74
Views: 13,254
Posted By Mich48041
Steve (Jetset44), Welcome to VansAirforce

Steve (Jetset44),
Welcome to VansAirforce
Forum: RV-12/RV-12iS 03-03-2019, 08:20 AM
Replies: 10
Views: 1,791
Posted By Mich48041
Press hard with both feet as you move the rudder....

Press hard with both feet as you move the rudder. If there is still noise, get a grandkid to climb into the tail to pinpoint exactly where the noise is coming from.
Forum: Electrical Systems 03-02-2019, 08:39 PM
Replies: 41
Views: 2,278
Posted By Mich48041
Keep in mind that the battery is not powering the...

Keep in mind that the battery is not powering the electrical system, the alternator is. And many alternators will continue to function if the battery is disconnected. Mine did. My PC680 failed...
Forum: Electrical Systems 02-27-2019, 02:25 PM
Replies: 6
Views: 1,486
Posted By Mich48041
This sounds like a marketing ploy to create a...

This sounds like a marketing ploy to create a demand for Tefzel wire and to drive the price up.
Forum: RV-12/RV-12iS 02-18-2019, 09:29 AM
Replies: 2
Views: 742
Posted By Mich48041
According to Van's parts list, it is .062X1/4...

According to Van's parts list, it is .062X1/4 PLASTIC TUBE
But it doesn't say what kind of plastic. My guess is nylon.
Forum: Electrical Systems 02-09-2019, 06:25 PM
Replies: 16
Views: 1,237
Posted By Mich48041
Not a stupid idea. It shows ingenuity. But I...

Not a stupid idea. It shows ingenuity.
But I would not do it because a steel bolt is a poor electrical conductor.
Although a short steel bolt might not offer much resistance.
It will not look...
Forum: Electrical Systems 02-09-2019, 03:10 PM
Replies: 16
Views: 1,237
Posted By Mich48041
Make sure that starter current does not go...

Make sure that starter current does not go through the shunt.
If that wire carries starter current, then it should be as big as the starter positive wire. Otherwise, it should be as big as the main...
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