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Search: Posts Made By: Mich48041
Forum: Electrical Systems 04-22-2018, 12:37 PM
Replies: 61
Views: 4,395
Posted By Mich48041
Bob N recently posted his reason for having an...

Bob N recently posted his reason for having an E-bus.
http://forums.matronics.com/viewtopic.php?t=16769582
The idea is to reduce pilot workload immediately after an alternator failure.
All the pilot...
Forum: Electrical Systems 04-21-2018, 06:39 AM
Replies: 61
Views: 4,395
Posted By Mich48041
1. Yes, heat is an enemy of electronics. 2. A 60...

1. Yes, heat is an enemy of electronics.
2. A 60 amp ANL current limiter will conduct 70+ amp indefinitely without blowing. Read Bob Nuckolls'...
Forum: Electrical Systems 04-20-2018, 05:04 PM
Replies: 12
Views: 814
Posted By Mich48041
Rob, do not be discouraged. Your latest...

Rob, do not be discouraged. Your latest schematic is looking pretty good. Just a few more minor changes and it will look exactly like Bob N's. :) Seriously though, you will not go wrong by using...
Forum: Electrical Systems 04-20-2018, 12:20 AM
Replies: 4
Views: 288
Posted By Mich48041
A DPDT (Double Pole Double Throw) switch could be...

A DPDT (Double Pole Double Throw) switch could be used, wired so that down is only one light and up is both lights.
Fuel pump grounded locally should be OK.
For strobe, it depends on how noisy they...
Forum: Electrical Systems 04-19-2018, 05:01 PM
Replies: 11
Views: 440
Posted By Mich48041
Consider what happens if the relay coil or its...

Consider what happens if the relay coil or its circuit fails. Will the load turn on with undesired results?
The normally closed contacts of some relays have a lower ampere rating than the normally...
Forum: Electrical Systems 04-17-2018, 03:16 PM
Replies: 8
Views: 501
Posted By Mich48041
Your Skyview 5vdc supply might be powering a...

Your Skyview 5vdc supply might be powering a manifold pressure sensor, fuel pressure sensor and trim position pot. It seems that the relay coil is powered by 5VDC. It is a good idea to measure the...
Forum: RV General Discussion/News 04-16-2018, 08:23 AM
Replies: 12
Views: 664
Posted By Mich48041
I built and Fly a RV-12. I chose that because...

I built and Fly a RV-12. I chose that because government regulations in the USA allow me to fly it without having a medical exam.
I would rather have built a RV-9 which has better short field...
Forum: Electrical Systems 04-15-2018, 08:16 PM
Replies: 8
Views: 501
Posted By Mich48041
According to the Skyview installation manual, the...

According to the Skyview installation manual, the +5 volts DC Auxiliary Power
Output is Limited to 300 mA by internal self-resetting fuse. Part of that 300 mA
supply might be used for various...
Forum: Electrical Systems 04-15-2018, 06:37 PM
Replies: 8
Views: 501
Posted By Mich48041
Here is a picture showing how to wire the flip...

Here is a picture showing how to wire the flip flop relay.
Vcc is +5vdc
Momentarily applying ground to the input terminal toggles the output relay.
Connect 12 volts to the relay COM terminal.
Connect...
Forum: Electrical Systems 04-15-2018, 02:06 PM
Replies: 8
Views: 501
Posted By Mich48041
eBay item number:292517299208 or search eBay for...

eBay item number:292517299208
or search eBay for Flip-Flop Latch Relay
Requires 5vdc for logic circuit.
Output relay can switch 12 volt load.
Costs less than $5 from U.S. supplier.
Half price direct...
Forum: Electrical Systems 04-11-2018, 09:18 AM
Replies: 9
Views: 316
Posted By Mich48041
Are the Dynon and Garmin RS232 cables reversed?

Are the Dynon and Garmin RS232 cables reversed?
Forum: Electrical Systems 04-08-2018, 03:44 PM
Replies: 15
Views: 1,011
Posted By Mich48041
Right you are Charlie. Some avionics have dual...

Right you are Charlie. Some avionics have dual power inputs that are diode isolated. Some have dual inputs in parallel because a single D-Sub pin can not carry the full current.
Forum: Electrical Systems 04-08-2018, 03:14 PM
Replies: 15
Views: 1,011
Posted By Mich48041
There is a saying, "Electricity takes the path of...

There is a saying, "Electricity takes the path of least resistance". Supposing that there are two paths available. One path consists of a short 4 AWG cable. The other path consists of a much...
Forum: Electrical Systems 04-07-2018, 11:48 PM
Replies: 6
Views: 516
Posted By Mich48041
Either your power supply is weak or else there is...

Either your power supply is weak or else there is a bad connection someplace. Or there is high resistance in the Control Module, which is equivalent to a bad connection. The bad connection can be...
Forum: Electrical Systems 04-04-2018, 03:41 PM
Replies: 13
Views: 647
Posted By Mich48041
I posted one of the above myths on the...

I posted one of the above myths on the AeroElectric List (http://forums.matronics.com/viewtopic.php?p=479101#479101). Bob Nuckolls replied that starter voltage spikes do not exist. He is offering...
Forum: Electrical Systems 04-04-2018, 11:37 AM
Replies: 13
Views: 647
Posted By Mich48041
Quote from the GRT Horizon Userís Guide pg. 1-1...

Quote from the GRT Horizon Userís Guide pg. 1-1 Rev C
Quote from the Dynon FlightDEK-D180 Pilotís User Guide Rev H page 2-1

I am sure that Garmin builds their avionics to the same high standards as...
Forum: Electrical Systems 04-03-2018, 05:46 PM
Replies: 13
Views: 647
Posted By Mich48041
Starters do not cause voltage surges. They cause...

Starters do not cause voltage surges. They cause cause voltage sags.
Nothing, including Dynon, can filter out nonexistent surges.
You are correct. The aircraft voltage can sag (brownout) to below...
Forum: Electrical Systems 04-01-2018, 10:34 AM
Replies: 10
Views: 742
Posted By Mich48041
Just because an alternator is capable of putting...

Just because an alternator is capable of putting out 60 amps does not mean that it will. An alternator puts out voltage and current determined by the load. It is up to loads to take whatever...
Forum: Electrical Systems 03-27-2018, 03:25 PM
Replies: 61
Views: 4,395
Posted By Mich48041
You might consider using a 2 or 3 amp circuit...

You might consider using a 2 or 3 amp circuit breaker instead of that 5 amp fuse
on the ground side of the aux alternator relay. Sometimes alternator output voltage
is unstable and momentarily...
Forum: Electrical Systems 03-27-2018, 02:53 PM
Replies: 61
Views: 4,395
Posted By Mich48041
Rob, The downloaded Power Point drawing is much...

Rob,
The downloaded Power Point drawing is much easier to read.
Flip the E-Bus-relay diode over so that the arrow points towards positive.
It will blow the fuse (or itself) the way it is now.
Forum: Electrical Systems 03-26-2018, 03:54 PM
Replies: 61
Views: 4,395
Posted By Mich48041
There is a program built into MS Windows called...

There is a program built into MS Windows called "Paint".
Use "Paint" to resize and crop pictures so that they are
not so wide before uploading them to the internet.
Forum: Electrical Systems 03-26-2018, 10:08 AM
Replies: 61
Views: 4,395
Posted By Mich48041
The above drawing was made using a very simple...

The above drawing was made using a very simple CAD program called ExpressPCB (https://www.expresspcb.com/).
Forum: Electrical Systems 03-26-2018, 10:06 AM
Replies: 61
Views: 4,395
Posted By Mich48041
Rob, The attached drawing shows the correct way...

Rob,
The attached drawing shows the correct way to connect the diode. The way
that the diode is connected in your drawing does no good at all. In fact, it
adds an unnecessary failure point. ...
Forum: Electrical Systems 03-25-2018, 09:24 AM
Replies: 61
Views: 4,395
Posted By Mich48041
Schematic below uses a double pole momentary push...

Schematic below uses a double pole momentary push button start switch
to disable the avionics relay during engine start. The diode in your drawing
is not wired correctly. Actually the diode is...
Forum: Electrical Systems 03-24-2018, 09:35 PM
Replies: 61
Views: 4,395
Posted By Mich48041
The reason for a diode is to prevent current from...

The reason for a diode is to prevent current from flowing from the battery
through the E-Bus to the main power bus and then to the starter motor when
cranking the engine. Yes, starter current will...
Forum: Electrical Systems 03-24-2018, 09:50 AM
Replies: 61
Views: 4,395
Posted By Mich48041
Get rid of that 30 amp breaker feeding the E-Bus...

Get rid of that 30 amp breaker feeding the
E-Bus relay. It requires an always hot wire
running into the cockpit. In case of a
forced landing, that hot wire will ignite
fuel. Mount the E-Bus...
Forum: RV-12 03-22-2018, 06:36 PM
Replies: 27
Views: 2,376
Posted By Mich48041
The voltage regulator does not supply electrical...

The voltage regulator does not supply electrical power to the ULS engine.
Other possible causes of rough engine are an engine driven fuel pump going bad or using winter gasoline when it is very warm...
Forum: Electrical Systems 03-22-2018, 06:30 PM
Replies: 20
Views: 1,384
Posted By Mich48041
Have you heard of a builder who spent years...

Have you heard of a builder who spent years building his plane, then forgot to put oil into the engine before first start? A builder can get the same sinking feeling when he realizes that the smoke...
Forum: RV-12 03-20-2018, 11:00 AM
Replies: 16
Views: 1,505
Posted By Mich48041
Mani, the avionics bay on the RV-12 is completely...

Mani, the avionics bay on the RV-12 is completely enclosed. The bottom is not open like many other aircraft. The two fans are mounted on the bottom of the avionics bay. One fan blows in and the...
Forum: RV-12 03-07-2018, 04:39 PM
Replies: 5
Views: 821
Posted By Mich48041
The wire part numbers include the length (unless...

The wire part numbers include the length (unless they changed them recently).
Edit: Oops, I misinterpreted the question.
Forum: RV-12 02-23-2018, 06:55 AM
Replies: 8
Views: 1,219
Posted By Mich48041
Move the magnetic reed switch closer to the...

Move the magnetic reed switch closer to the magnet. Or better yet, mount the reed switch parallel to the magnet.
Forum: Electrical Systems 02-11-2018, 08:25 AM
Replies: 9
Views: 627
Posted By Mich48041
Some battery tenders SHORTEN the life of...

Some battery tenders SHORTEN the life of batteries. I suggest that a battery tender be connected for only a short time, not connected continuously.
Forum: Glass Cockpit 01-07-2018, 07:47 PM
Replies: 3
Views: 495
Posted By Mich48041
I would not assume anything. Using the wrong...

I would not assume anything. Using the wrong voltage can damage equipment. What does the Skysports manual say?
Forum: RV-12 01-03-2018, 07:22 AM
Replies: 5
Views: 967
Posted By Mich48041
Prior to the "over rudder wireway", two separate...

Prior to the "over rudder wireway", two separate cushion clamps were used, one on each side. Sometimes cushion clamps can be difficult to install, especially when working upside down with obstacles...
Forum: RV-12 01-02-2018, 04:55 PM
Replies: 9
Views: 903
Posted By Mich48041
Grounding the tank might not be good enough...

Grounding the tank might not be good enough because tank sealant is an insulator. Take Dale's advice and ground the level sensor mounting plate.
Forum: RV-12 12-29-2017, 05:09 PM
Replies: 12
Views: 1,799
Posted By Mich48041
Loctite thread locker only cures between metal...

Loctite thread locker only cures between metal fasteners where it is not exposed to air (anaerobic). It will not cure when used between plastic parts.
Forum: Electrical Systems 12-27-2017, 12:26 PM
Replies: 37
Views: 3,597
Posted By Mich48041
A wrench does NOT get pulled in. It might seem...

A wrench does NOT get pulled in. It might seem that it does, but the only force is inertia while the wrench is being turned. Electric motors convert electricity into motion using magnetism. In...
Forum: Electrical Systems 12-27-2017, 07:39 AM
Replies: 37
Views: 3,597
Posted By Mich48041
I agree with Charlie. High currents do not hold...

I agree with Charlie. High currents do not hold contacts together, at least in an airplane. High voltages (thousands) are a different story. The force that holds a wrench against ground is called...
Forum: Electrical Systems 12-21-2017, 10:08 AM
Replies: 13
Views: 1,163
Posted By Mich48041
Those Buss fuse holders are NOT compact. There...

Those Buss fuse holders are NOT compact. There is too much space between fuses. I purchased one of them and did not use it because:
1. The fuses are not compact.
2. The sockets do not grip the...
Forum: Engine Monitors 12-20-2017, 02:07 PM
Replies: 9
Views: 728
Posted By Mich48041
Ask GRT how the loose wires (one on each tank)...

Ask GRT how the loose wires (one on each tank) know to tighten themselves up when the EIS is rebooted. :D
Forum: RV-12 12-19-2017, 11:44 AM
Replies: 11
Views: 1,636
Posted By Mich48041
Try thick axle grease first instead of glue.

Try thick axle grease first instead of glue.
Forum: Electrical Systems 12-19-2017, 04:42 AM
Replies: 90
Views: 17,895
Posted By Mich48041
If you want the electrical system to be as...

If you want the electrical system to be as reliable as your Toyota, then use fuses. No need to design an electrical system, just use one of Bob Nuckolls' well proven designs which are being used in...
Forum: RV-12 12-18-2017, 07:47 AM
Replies: 9
Views: 1,651
Posted By Mich48041
Breaking the 120 knot speed limit for LSA...

Breaking the 120 knot speed limit for LSA aircraft and Sport Pilots in the USA with the Rotax 912 powered RV-12 with fixed pitch prop is unlikely without risking damaging the engine.
Forum: Electrical Systems 12-13-2017, 05:23 PM
Replies: 22
Views: 1,924
Posted By Mich48041
The primary purpose of diodes across inductive...

The primary purpose of diodes across inductive coils is to protect switches from arcing when they are shut off. Arcing will shorten the life of switches. If diodes happen to reduce the clicking...
Forum: RV-12 12-09-2017, 03:50 PM
Replies: 19
Views: 2,271
Posted By Mich48041
Fuel pressure from the electric pump is dependent...

Fuel pressure from the electric pump is dependent on restrictions to flow. Not much restriction results in not much pressure, even though the flow rate might be 30 gallons per hour. The pressure...
Forum: RV-12 12-09-2017, 09:45 AM
Replies: 37
Views: 5,109
Posted By Mich48041
John, I suggest that you cover up the top 1.5" or...

John, I suggest that you cover up the top 1.5" or 2" of the oil cooler with duct tape as an experiment to see what affect that has on oil temperature in very cold weather. I suspect that the temp...
Forum: RV-12 12-09-2017, 09:19 AM
Replies: 19
Views: 2,271
Posted By Mich48041
Electrical fuel pressure sensors are notoriously...

Electrical fuel pressure sensors are notoriously inaccurate. Mechanical gauges can not be trusted either unless their accuracy has been verified. To check the accuracy of the mechanical gauge,...
Forum: RV-12 12-08-2017, 11:08 AM
Replies: 37
Views: 5,109
Posted By Mich48041
I understand that thermostat bypasses between 90...

I understand that thermostat bypasses between 90 and 98 percent of the oil around the cooler and up to 10 percent of the oil goes through the cooler. My RV-12 does not have an oil thermostat. I...
Forum: RV-12 12-08-2017, 07:45 AM
Replies: 37
Views: 5,109
Posted By Mich48041
It seems to me that if the oil-cooler-bypass...

It seems to me that if the oil-cooler-bypass thermostat is set at 190 degrees F and if the oil temperature sensor is located relatively close downstream of the thermostat, then the oil temperature...
Forum: COMM 11-30-2017, 09:20 AM
Replies: 3
Views: 322
Posted By Mich48041
I interpret the Garmin install manual the same as...

I interpret the Garmin install manual the same as you.
Connect pilot PTT to GTR 200 pin 35.
Connect copilot PTT to GTR 200 pin 15.
Since you are not using a hand-held MIC, do not connect GTR 200 pins...
Forum: ADS-B 11-28-2017, 07:43 AM
Replies: 87
Views: 15,703
Posted By Mich48041
Read the last post in THIS...

Read the last post in THIS (http://forums.matronics.com/viewtopic.php?t=16768057&sid=037157fb7762c8d1ad3d82631e29849b) thread by Bob Nuckolls. According to his opinion, a 5 amp fuse should be good. ...
Forum: RV-12 11-27-2017, 11:50 AM
Replies: 11
Views: 2,684
Posted By Mich48041
If your push-to-talk switches are cheap Radio...

If your push-to-talk switches are cheap Radio Shack ones, you might try new switches. I replaced mine with part number ISR3SAD600.
Forum: RV-12 11-25-2017, 07:18 AM
Replies: 41
Views: 5,705
Posted By Mich48041
There are other, more likely, causes of a melted...

There are other, more likely, causes of a melted piston than using unleaded fuel recommended by Rotax: incorrect ignition timing, mechanical problems, oil lubrication problems, incorrect prop pitch.
Forum: RV-12 11-24-2017, 09:51 AM
Replies: 20
Views: 2,243
Posted By Mich48041
Ted, The GPS 2020 is a separate unit from the...

Ted, The GPS 2020 is a separate unit from the transponder. But the two units work together as a team to send data to both other airplanes and to ATC ground stations. That data includes your exact...
Forum: COMM 11-23-2017, 01:27 PM
Replies: 6
Views: 624
Posted By Mich48041
You could use switches if you only want to listen...

You could use switches if you only want to listen to one audio source at a time. A double pole switch can choose between two audio sources. But if you want to listen to two or more audio sources...
Forum: ADS-B 11-17-2017, 06:48 AM
Replies: 12
Views: 2,419
Posted By Mich48041
Installing a new transponder has advantages. ...

Installing a new transponder has advantages. There is only one box to fail. And if it does, there is no doubt about which unit has failed. You will not have to argue with two separate companies...
Forum: RV-12 11-09-2017, 11:29 AM
Replies: 15
Views: 4,048
Posted By Mich48041
EXflyer Boyd, welcome to VansAirforce. (belatedly)

EXflyer
Boyd, welcome to VansAirforce. (belatedly)
Forum: RV-12 11-09-2017, 06:51 AM
Replies: 13
Views: 2,570
Posted By Mich48041
Check out Spruce Creek. If lucky, you could find...

Check out Spruce Creek. If lucky, you could find a home with attached hangar. And there are lots of pilots and builders to offer advice and help with a project.
Spruce Creek
Port Orange, FL...
Forum: RV-12 11-09-2017, 06:38 AM
Replies: 13
Views: 2,570
Posted By Mich48041
I routinely operate from a grass strip with no...

I routinely operate from a grass strip with no problem. Keep the nose wheel wheel off the ground as much as possible and do not let the nose fork dig in.
-
The landing light should not be a deciding...
Forum: RV-12 11-08-2017, 12:05 PM
Replies: 11
Views: 1,660
Posted By Mich48041
The iS has a larger alternator, if that matters...

The iS has a larger alternator, if that matters to you.
Forum: RV-12 11-06-2017, 06:46 PM
Replies: 79
Views: 16,917
Posted By Mich48041
Why is IFR not allowed for E-LSA? Assume pilot...

Why is IFR not allowed for E-LSA?
Assume pilot has a current medical and is IFR rated and current and the plane is IFR equipped.
Forum: RV-12 11-05-2017, 05:53 AM
Replies: 8
Views: 1,659
Posted By Mich48041
I have not tried this yet, but thought of...

I have not tried this yet, but thought of injecting Great Stuff Foam into plastic bags that have been stuffed into gaps.
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