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Search: Posts Made By: Mich48041
Forum: Electrical Systems 12-13-2017, 06:23 PM
Replies: 22
Views: 1,381
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, 04:50 PM
Replies: 19
Views: 1,365
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, 10:45 AM
Replies: 28
Views: 1,688
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, 10:19 AM
Replies: 19
Views: 1,365
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, 12:08 PM
Replies: 28
Views: 1,688
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, 08:45 AM
Replies: 28
Views: 1,688
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, 10:20 AM
Replies: 3
Views: 212
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, 08:43 AM
Replies: 66
Views: 11,591
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, 12:50 PM
Replies: 11
Views: 1,777
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, 08:18 AM
Replies: 41
Views: 4,257
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, 10:51 AM
Replies: 20
Views: 1,570
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, 02:27 PM
Replies: 6
Views: 496
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, 07:48 AM
Replies: 12
Views: 1,444
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, 12:29 PM
Replies: 15
Views: 3,773
Posted By Mich48041
EXflyer Boyd, welcome to VansAirforce. (belatedly)

EXflyer
Boyd, welcome to VansAirforce. (belatedly)
Forum: RV-12 11-09-2017, 07:51 AM
Replies: 13
Views: 2,227
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, 07:38 AM
Replies: 13
Views: 2,227
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, 01:05 PM
Replies: 11
Views: 1,452
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, 07:46 PM
Replies: 61
Views: 9,828
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, 06:53 AM
Replies: 8
Views: 1,430
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.
Forum: RV-12 11-04-2017, 08:11 AM
Replies: 9
Views: 1,119
Posted By Mich48041
Those ferrite chokes work best at radio...

Those ferrite chokes work best at radio frequencies. For audio frequencies, a "ground loop isolator" is worth a try, available on Amazon and eBay.
Forum: RV-12 10-28-2017, 09:02 AM
Replies: 7
Views: 1,195
Posted By Mich48041
The trim takeoff position on the EFIS display is...

The trim takeoff position on the EFIS display is about 1/3 of full scale. It is better to error on the side of nose down trim. At least one RV-12 has crashed on first flight because of too much...
Forum: RV-12 10-26-2017, 08:32 AM
Replies: 4
Views: 766
Posted By Mich48041
Unfortunately I have 15-02 revision 0. I can not...

Unfortunately I have 15-02 revision 0. I can not find revision 1 on Van's website. If you can not figure it out, then install the extra nutplates. I do not see any harm if the extra nutplates are...
Forum: RV-12 10-25-2017, 09:54 PM
Replies: 4
Views: 766
Posted By Mich48041
Step 9 on 15-02 says, Dimple then install three...

Step 9 on 15-02 says, Dimple then install three nutplates on each nose rib.
And figure 4 says, K1000-08 3 places. So both the text and figure 4 call for three nutplates.
Step 10 text says, "Dimple...
Forum: Electrical Systems 10-21-2017, 07:18 PM
Replies: 19
Views: 3,399
Posted By Mich48041
There are at least 3 ways to regulate the output...

There are at least 3 ways to regulate the output from a permanent magnet alternator (dynamo).
1. Shunt excess current to ground.
2. Add series resistance to limit current.
3. Turn the current on and...
Forum: RV-12 10-20-2017, 07:49 AM
Replies: 22
Views: 1,962
Posted By Mich48041
With the return line outlet being high in the...

With the return line outlet being high in the tank, fuel can not siphon backwards. If a pilot elects to pull the red knob to shut off the fuel, he can be confident that fuel will stop flowing from...
Forum: RV-12 10-18-2017, 09:33 AM
Replies: 76
Views: 28,816
Posted By Mich48041
Metal siding and roofing can interfere with or...

Metal siding and roofing can interfere with or block cell phone signals.
Forum: RV-12 10-16-2017, 09:57 AM
Replies: 22
Views: 3,202
Posted By Mich48041
Steve, My average fuel pressure with engine off...

Steve,
My average fuel pressure with engine off and electric pump on is 2.6 psi.
At cruise with both pumps on, the average pressure is 4.3
Keep in mind that the senders are notorious inaccurate. The...
Forum: RV-12 10-16-2017, 09:18 AM
Replies: 29
Views: 4,067
Posted By Mich48041
Another advantage of slowing the airplane to lose...

Another advantage of slowing the airplane to lose altitude for landing is that the airplane is exposed to a headwind for a longer time. That gives more time to descend.
Forum: Glass Cockpit 10-10-2017, 08:23 AM
Replies: 19
Views: 2,690
Posted By Mich48041
g3xpert, The Garmin part numbers and letters are...

g3xpert,
The Garmin part numbers and letters are like a foreign language. A newbie has no idea which components are required. It would be helpful to those shopping for avionics if there was a list...
Forum: RV-12 10-10-2017, 12:17 AM
Replies: 14
Views: 1,548
Posted By Mich48041
How an airplane is registered has no affect on...

How an airplane is registered has no affect on its status as a LSA. LSA defines the characteristics of the aircraft. Think tail dragger or high wing. No matter how an aircraft is registered, it is...
Forum: RV-12 10-09-2017, 06:10 PM
Replies: 82
Views: 9,895
Posted By Mich48041
DaleB, Thanks for your comments. At one time I...

DaleB,
Thanks for your comments. At one time I had the same problem with the autopilot that you describe. But updating the D-180 software fixed it. After that the D-180 worked fine with the...
Forum: RV-12 10-09-2017, 11:51 AM
Replies: 82
Views: 9,895
Posted By Mich48041
John, I removed the 496 and surface mounted an...

John,
I removed the 496 and surface mounted an iFly GPS. The iFly viewing surface is about an inch away from the instrument panel. The iFly GPS works well without an external antenna. The Garmin...
Forum: RV-12 10-06-2017, 08:39 PM
Replies: 10
Views: 1,432
Posted By Mich48041
Even if the fuel tank is so full that gasoline...

Even if the fuel tank is so full that gasoline fills the vent line, the fuel pressure at the bottom of the tank will be higher than when the tank is not quite so full. That statement can be proven...
Forum: RV-12 10-06-2017, 09:36 AM
Replies: 46
Views: 10,182
Posted By Mich48041
Don, Follow BigJohn's advice. That takes care of...

Don,
Follow BigJohn's advice. That takes care of the regulations.
Your big problem is insurance. Many, if not most, insurance companies are reluctant to accept new customers who are 80 years old or...
Forum: Autopilots 10-03-2017, 09:28 PM
Replies: 4
Views: 307
Posted By Mich48041
Search Digi-Key for LP0115CCKW015DB

Search Digi-Key for LP0115CCKW015DB
Forum: RV-12 10-03-2017, 09:21 AM
Replies: 24
Views: 3,463
Posted By Mich48041
The RV-12 has low drag, even with flaps deployed....

The RV-12 has low drag, even with flaps deployed. It will float a long way down the runway unless airspeed is properly managed.
Forum: RV-12 10-01-2017, 05:21 PM
Replies: 51
Views: 6,231
Posted By Mich48041
Yes, the fuel pressure sensor compares...

Yes, the fuel pressure sensor compares atmospheric pressure to fuel pressure. If the air pressure at the sensor changes, then the displayed fuel pressure will change too, even though the fuel...
Forum: RV-12 09-28-2017, 07:10 AM
Replies: 51
Views: 6,231
Posted By Mich48041
2 PSI is equal to about 2 meters of head pressure...

2 PSI is equal to about 2 meters of head pressure in a gravity fed fuel system. That is plenty. The maximum pressure is set by an internal spring inside of the engine driven fuel pump. Pressure...
Forum: RV-12 09-26-2017, 12:16 PM
Replies: 51
Views: 6,231
Posted By Mich48041
How do you know it is telling the truth? The...

How do you know it is telling the truth? The pressure sensors are notoriously inaccurate.
Forum: Electrical Systems 09-21-2017, 09:17 PM
Replies: 17
Views: 3,915
Posted By Mich48041
Possible part numbers: AM101406, or MIA881279, or...

Possible part numbers: AM101406, or MIA881279, or JDR1406
Forum: COMM 09-21-2017, 12:03 PM
Replies: 9
Views: 480
Posted By Mich48041
Compromise Only insulate the mic jacks. The mic...

Compromise
Only insulate the mic jacks. The mic signals get amplified along with any noise. The earphone audio has already been amplified, so it is not as vulnerable to noise. Aircraft Spruce part...
Forum: RV-12 09-17-2017, 07:36 PM
Replies: 23
Views: 3,391
Posted By Mich48041
Weigh the new carb floats. Some new ones were...

Weigh the new carb floats. Some new ones were bad.
Check the fuel tank vent.
Try using 100LL.
Forum: RV-12 09-17-2017, 12:01 PM
Replies: 5
Views: 578
Posted By Mich48041
Make sure that the parts are machined deep enough...

Make sure that the parts are machined deep enough so that the bearing is not squashed after riveting.
I would not scrape, but lightly sanding the spacers with fine paper should be OK.
Forum: ADS-B 09-16-2017, 08:25 AM
Replies: 164
Views: 25,943
Posted By Mich48041
I assume that you are talking about the Stratus...

I assume that you are talking about the Stratus ADS-B-IN portable receiver. The Stratus ESG Transponder does not receive traffic and weather. The ESG is OUT only.
If you install the SkyView in the...
Forum: ADS-B 09-15-2017, 08:08 AM
Replies: 164
Views: 25,943
Posted By Mich48041
The Appareo Stratus ESG has GPS data out. Or do...

The Appareo Stratus ESG has GPS data out. Or do you mean it does not have traffic and weather? I like the fact that the Appareo is just one box, not dependent on other brand equipment. If two...
Forum: Electrical Systems 09-15-2017, 07:48 AM
Replies: 15
Views: 1,184
Posted By Mich48041
Yes, that is correct, unless the master switch is...

Yes, that is correct, unless the master switch is double pole, one half for the battery contactor and one half for the alternator field.
Circuit breakers and fuses protect against short circuits and...
Forum: RV-12 09-14-2017, 12:40 PM
Replies: 10
Views: 1,504
Posted By Mich48041
There is what looks to be a white wire that goes...

There is what looks to be a white wire that goes from the control board fuselage pin 21 to the ELT. Some builders did not connect that wire to the ELT.
That wire is actually a coaxial shielded...
Forum: Electrical Systems 09-14-2017, 12:04 PM
Replies: 15
Views: 1,184
Posted By Mich48041
There needs to be some way of shutting off the...

There needs to be some way of shutting off the alternator in case of smoke in cockpit. If the circuit breaker also functions as a switch, then a separate switch is not necessary.
Shutting off the...
Forum: RV-12 09-14-2017, 08:24 AM
Replies: 24
Views: 4,972
Posted By Mich48041
The disadvantage of doing that is that there is...

The disadvantage of doing that is that there is no way to shut off electrical power in case of smoke in the cockpit. Shutting off the master contactor will not shut down the charging system because...
Forum: COMM 09-11-2017, 08:46 PM
Replies: 13
Views: 911
Posted By Mich48041
Check all ground wires, especially going to the...

Check all ground wires, especially going to the engine. The engine mount should NOT be used as part of the grounding circuit.
Forum: RV-12 09-10-2017, 09:18 PM
Replies: 20
Views: 2,938
Posted By Mich48041
Try removing the radio antenna, cleaning the both...

Try removing the radio antenna, cleaning the both the antenna base and the fuselage skin to make sure there is good metal to metal contact when it is reinstalled. Also check the coax cable at each...
Forum: Electrical Systems 09-10-2017, 02:32 PM
Replies: 23
Views: 1,469
Posted By Mich48041
Use #16 wire per the manufacturers pdf...

Use #16 wire per the manufacturers pdf document.
Nearby electrical conductors (single or dual polarity) will have negligible affect on a nav antenna. However a single conductor could affect a...
Forum: Electrical Systems 09-09-2017, 08:48 PM
Replies: 23
Views: 1,469
Posted By Mich48041
If this document is for your wing tip...

If this document is for your wing tip lights
http://www.aveoengineering.com/downloads/ConformaZipTips-wiring.pdf
it shows #16 as the maximum wire size.
If your plane is a RV-10, why not use the...
Forum: Electrical Systems 09-09-2017, 03:40 PM
Replies: 23
Views: 1,469
Posted By Mich48041
For the most part, use #22 for signal wires and...

For the most part, use #22 for signal wires and #18 for power wires. Temperature rise is not a concern for intermittent loads. If you think that larger than #18 is needed, get another opinion.
Forum: Electrical Systems 09-09-2017, 12:10 PM
Replies: 16
Views: 879
Posted By Mich48041
A bad connection has resistance. When current...

A bad connection has resistance. When current flows through that resistance, heat is generated. That heat can damage whatever the terminal is connected to, like switches, circuit breakers or fuses.
Forum: RV-12 09-07-2017, 02:46 PM
Replies: 300
Views: 264,241
Posted By Mich48041
Most planes have the top of the switch labeled...

Most planes have the top of the switch labeled "DOWN", like you have it. I know it seems counter intuitive, but the way that I remember it is that pushing the top of the control stick causes the...
Forum: Electrical Systems 09-06-2017, 10:33 AM
Replies: 16
Views: 3,212
Posted By Mich48041
If an aux battery has a load connected to it,...

If an aux battery has a load connected to it, then it will never recharge through a series resistor.
If the aux battery is fully charged initially and the switch is closed, then the load will draw...
Forum: Electrical Systems 09-06-2017, 08:25 AM
Replies: 16
Views: 879
Posted By Mich48041
It would seem that a short circuit located some...

It would seem that a short circuit located some distance away from the switch that heats the entire length of wire would draw so much current that the circuit breaker would trip immediately. That...
Forum: Electrical Systems 09-05-2017, 09:33 PM
Replies: 16
Views: 879
Posted By Mich48041
How many terminals on the switch have wires...

How many terminals on the switch have wires attached to them, just 2? Or more? Can you feel the wires at the other end that is farthest from the switch to see if they are hot there? Can you feel...
Forum: Electrical Systems 09-03-2017, 11:28 AM
Replies: 4
Views: 328
Posted By Mich48041
Check all connections on the shunt to be sure...

Check all connections on the shunt to be sure that they are clean and tight. The vast majority of electrical problems are due to bad connections.
Alternator current is determined by the loads, not...
Forum: Electrical Systems 09-01-2017, 09:32 PM
Replies: 66
Views: 6,200
Posted By Mich48041
I agree with Carl and Walt and Charlie. Use...

I agree with Carl and Walt and Charlie. Use circuit breakers or better yet, fuses. It is unlikely they will become obsolete. If they break, the aircraft owner can fix the problem herself without...
Forum: Electrical Systems 08-29-2017, 10:01 PM
Replies: 42
Views: 2,987
Posted By Mich48041
The crowbar over-voltage protection devices that...

The crowbar over-voltage protection devices that I am familiar with do not automatically reset.
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