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Search: Posts Made By: Carl Froehlich
Forum: Electrical Systems Today, 11:20 AM
Replies: 21
Views: 453
Posted By Carl Froehlich
Not enough data to draw a conclusion, so I will...

Not enough data to draw a conclusion, so I will speculate.

Electrical noise is one reason why you have these symptoms. Electrical noise associated with landing or NAV/Strobes could be with an old...
Forum: Fuel Injection Systems 02-24-2021, 10:00 AM
Replies: 54
Views: 3,228
Posted By Carl Froehlich
My new Colorado truck has direct injection - has...

My new Colorado truck has direct injection - has a compression ratio of 11.5 to 1 and burns 87 octane unleaded.

Now if someone can do direct injection for a Lycoming, I’d buy it.

Carl
Forum: Alternative Engines 02-23-2021, 09:34 AM
Replies: 7
Views: 798
Posted By Carl Froehlich
Yep - rotary engines can be problematic. I...

Yep - rotary engines can be problematic. I however am thrilled someone is putting money into alternative aviation Diesel engines - beyond a traditional four stroke, heavy diesel variant of a...
Forum: RV General Discussion/News 02-22-2021, 07:54 PM
Replies: 15
Views: 1,889
Posted By Carl Froehlich
I’d buy a new skin, but that is just me. A...

I’d buy a new skin, but that is just me.

A repair might be:
- Add a 0.032” doubler behind that rivet hole, extending to the rivets on each side (so the doubler has three rivets in it.
- Drill out...
Forum: Fuel Injection Systems 02-22-2021, 03:23 PM
Replies: 54
Views: 3,228
Posted By Carl Froehlich
I would be very interested in some data to...

I would be very interested in some data to support this statement. I’ve seen the claims by EFII and SDS on more power and higher efficiency, but have not seen supporting data for these claims - such...
Forum: Electronic Ignition Systems 02-19-2021, 01:47 PM
Replies: 12
Views: 516
Posted By Carl Froehlich
Considering this new information I do not...

Considering this new information I do not understand why you think this is a spark issue.

Carl
Forum: Electronic Ignition Systems 02-19-2021, 11:14 AM
Replies: 12
Views: 516
Posted By Carl Froehlich
I too run LOP 90% of the time on dual pMags, but...

I too run LOP 90% of the time on dual pMags, but I run the standard BR8ES plugs (good service over ~20 years).

I note that your run way more LOP than I do. After taking a lot of cross country data...
Forum: Glass Cockpit 02-18-2021, 03:27 PM
Replies: 29
Views: 2,284
Posted By Carl Froehlich
Yep - add FlightStream (at ~$1000) to provide a...

Yep - add FlightStream (at ~$1000) to provide a function that should already be included in these $10K+ boxes.

This is one example of why I avoid Garmin products for everything other than the clunky...
Forum: Electrical Systems 02-18-2021, 10:58 AM
Replies: 24
Views: 901
Posted By Carl Froehlich
Assume the fault is on your one buss, so getting...

Assume the fault is on your one buss, so getting power to the buss is not the issue. This simple example demonstrates why diodes, no matter how used, does not equate to separate busses.

A battery...
Forum: Electrical Systems 02-18-2021, 10:31 AM
Replies: 24
Views: 901
Posted By Carl Froehlich
Brian, You are overlooking many cons associated...

Brian,

You are overlooking many cons associated with either option.

For an electrically dependent engine (not that I recommend having one) I suggest starting with:
- Two equally sized batteries.
-...
Forum: Tools 02-16-2021, 06:12 PM
Replies: 15
Views: 692
Posted By Carl Froehlich
Yes - at the bottom. A standard hose facet along...

Yes - at the bottom. A standard hose facet along with some PVC connector. The pipe sealed around the bottom of the bucket with left over mico (always seem to have some left over - may as well use...
Forum: GPS 02-16-2021, 05:47 PM
Replies: 10
Views: 754
Posted By Carl Froehlich
No, but many (like me) are waiting and hoping for...

No, but many (like me) are waiting and hoping for them to do so. In the meantime you have to pick the best of the current bad options out there for a TSO GPS navigator.

I installed a GTN-650 on the...
Forum: RV-7/7A 02-16-2021, 02:51 PM
Replies: 14
Views: 1,922
Posted By Carl Froehlich
While I would never mount a cooler on an engine...

While I would never mount a cooler on an engine baffle, this install takes me by surprise. You have an oil cooler hard mounted to the engine mount, connected with fiberglass and rubber to a shaking...
Forum: Tools 02-15-2021, 09:45 AM
Replies: 15
Views: 692
Posted By Carl Froehlich
When you get around to final paint, here is a DIY...

When you get around to final paint, here is a DIY water separator that works amazingly well.
Run the output line up hill, add ice and drain from time to time (bottom blow valve not shown in the...
Forum: RV Building Tips/Techniques 02-15-2021, 09:35 AM
Replies: 5
Views: 468
Posted By Carl Froehlich
The short answer - yes. Carl

The short answer - yes.

Carl
Forum: RV General Discussion/News 02-15-2021, 09:31 AM
Replies: 28
Views: 1,798
Posted By Carl Froehlich
Every “put the little wheel between the rods”...

Every “put the little wheel between the rods” type tow bar i tried proved to be close to useless as the tail wheel always popped out.

I did a simple modification of the nose gear tow bar by making...
Forum: RV Building Tips/Techniques 02-14-2021, 05:31 PM
Replies: 24
Views: 1,850
Posted By Carl Froehlich
The short answer in #!*$ no. Dual pMags - both...

The short answer in #!*$ no.

Dual pMags - both on for engine start. Simple, easy, reliable.

Carl
Forum: RV-8/8A 02-13-2021, 10:10 AM
Replies: 8
Views: 577
Posted By Carl Froehlich
Overkill. Here is how I wired the AeroLeds on...

Overkill.

Here is how I wired the AeroLeds on two RVs:
- Each nav/strobe is fed via a 3 conductor, #20 shielded wire. The three conductors are for nav power, strobe power and sync wire. The shield...
Forum: RV General Discussion/News 02-12-2021, 06:49 PM
Replies: 5
Views: 329
Posted By Carl Froehlich
Fan out the shield wires away from the three...

Fan out the shield wires away from the three conductors in each shielded bundle, twist them together with a #18 wire, solder then cover this joint with heat shrink. The #18 goes to ground. Have the...
Forum: RV-10 02-12-2021, 05:00 PM
Replies: 3
Views: 477
Posted By Carl Froehlich
I assume your buss voltage was up to normal...

I assume your buss voltage was up to normal (13.8-14.2vdc). If not, that is a problem.

If your only ground is at the wingtip (not recommended), do not assume that a simple continuity check will...
Forum: RV Building Tips/Techniques 02-12-2021, 11:02 AM
Replies: 16
Views: 670
Posted By Carl Froehlich
Van’s sells what you...

Van’s sells what you need:
https://shop.vansaircraft.com/cgi-bin/shop.cgi?ident=1613068283-448-480&browse=hardware

Don’t forget to get firesleeve, the firesleeve clamps and high temp RTV for the...
Forum: RV-7/7A 02-11-2021, 09:22 AM
Replies: 38
Views: 8,523
Posted By Carl Froehlich
I’ve seen RV-10s with the VOR antenna on the...

I’ve seen RV-10s with the VOR antenna on the bottom of the fuselage, under the tail. Exactly where your eyeball will be when tying down the plane - or where a kid will be around your plane at some...
Forum: RV-7/7A 02-10-2021, 04:57 PM
Replies: 38
Views: 8,523
Posted By Carl Froehlich
To your specific question, no - it makes no...

To your specific question, no - it makes no difference. For that matter the elements can be in a straight line.

BUT DON”T DO IT! Use a wingtip antenna for VOR/LOC/GS. The eye ball you save from...
Forum: RV-14 02-10-2021, 02:50 PM
Replies: 6
Views: 364
Posted By Carl Froehlich
I installed a the dual SkyView ADAHRS modules in...

I installed a the dual SkyView ADAHRS modules in the kit provided wing mount bracket on an RV-14A. No remote magnetometer required or desired. Three years of flying and all is well.

Carl
Forum: Electronic Ignition Systems 02-10-2021, 02:45 PM
Replies: 2
Views: 475
Posted By Carl Froehlich
Answers: 1. The pMag only needs ship power on...

Answers:
1. The pMag only needs ship power on startup - as long as engine RPM stays above the minimum for the internal generator to provide the power needed to run the ignition (advertised at ~900...
Forum: GPS 02-09-2021, 08:21 PM
Replies: 64
Views: 3,328
Posted By Carl Froehlich
On the first RV-10 I did both the SkyView GPS...

On the first RV-10 I did both the SkyView GPS antenna/receiver and the GTN-650 GPS antenna on the glare shield, one on each side. Worked just fine. Just mind the minimum length of coax for the...
Forum: Electrical Systems 02-09-2021, 04:30 PM
Replies: 8
Views: 725
Posted By Carl Froehlich
Three RVs flying, and none have an ammeter - and...

Three RVs flying, and none have an ammeter - and never missed.

Voltage is a superior indication of system operation and I need not know what current flow is all the time. I measure it once during...
Forum: Electrical Systems 02-09-2021, 09:18 AM
Replies: 4
Views: 254
Posted By Carl Froehlich
Pick your poison, but I would not put either in...

Pick your poison, but I would not put either in an IFR RV. They violate my power distribution single point failure criteria. For that matter I would not build an IFR RV with a single ship battery...
Forum: Electronic Ignition Systems 02-08-2021, 10:11 AM
Replies: 5
Views: 442
Posted By Carl Froehlich
I note that VAF gets a lot of posts on “ignition...

I note that VAF gets a lot of posts on “ignition switch issues” - especially when going to one or more EIs.

After being stranded with a spam can caused by a finicky ignition switch I decided to...
Forum: RV-8/8A 02-07-2021, 01:10 PM
Replies: 12
Views: 1,290
Posted By Carl Froehlich
Dan, I did not like the long run on the bottom...

Dan,

I did not like the long run on the bottom skin between F808 and F809 ribs. On both the RV-8A and RV-8 I added a 0.032” 3/4”x3/4” angle between the two bulkheads and riveted to the bottom skin....
Forum: Alternative Engines 02-06-2021, 06:51 PM
Replies: 45
Views: 3,072
Posted By Carl Froehlich
If you find a “tried and proven” diesel or...

If you find a “tried and proven” diesel or turbine option, we will be all ears. As far a I know none exist (at least no option that does not double the price of the plane).

The parallel valve...
Forum: RV-8/8A 02-05-2021, 12:13 PM
Replies: 7
Views: 871
Posted By Carl Froehlich
On the RV-8A, the RV-10 and the RV-8 I made a...

On the RV-8A, the RV-10 and the RV-8 I made a simple bracket that mounts to the bottom center of the bulkhead just forward of the panel. The kit provided brake lines are long enough to reach.

The...
Forum: RV-8/8A 02-04-2021, 08:56 PM
Replies: 11
Views: 1,012
Posted By Carl Froehlich
You need to define the mission for the...

You need to define the mission for the plane.

For example, if you set high efficiency cruise as a top priority, this may not be the best engine choice. If you want a nibble aerobatic plane, this is...
Forum: VAF Classifieds (posts in here deleted after 30 days) 02-04-2021, 10:39 AM
Replies: 21
Views: 2,657
Posted By Carl Froehlich
As has been touched on, I’ve done four dual...

As has been touched on, I’ve done four dual screen Dynon SkyView panels. I offer that people looking at “what avionics shop should I use” are missing the mark. Consider:
- Will the avionics shop...
Forum: RV Building Tips/Techniques 02-03-2021, 10:13 AM
Replies: 27
Views: 2,750
Posted By Carl Froehlich
The short answer, worse. A stock RV-14A with the...

The short answer, worse.

A stock RV-14A with the flow transducer mounted per Van’s FWF kit instructions worked either perfectly, or it just failed to ~14GPH reading no mater what the fuel flow (as...
Forum: RV Building Tips/Techniques 02-03-2021, 09:39 AM
Replies: 9
Views: 430
Posted By Carl Froehlich
Just to make sure you know, Van’s does sell the...

Just to make sure you know, Van’s does sell the pre-drilled and cut panel blanks for the RV-14. Why they don’t include them in the kit (like they always have done) is beyond me.

The panel screws...
Forum: RV Ongoing Maintenance Issues 02-02-2021, 09:03 PM
Replies: 21
Views: 1,291
Posted By Carl Froehlich
These two products fit the...

These two products fit the bill:
https://flyleds.com/products/#!/Double-Spotlight/p/151025026/category=0

https://flyleds.com/products/#!/Double-Spot-mounting-plate/p/198311371/category=0

Carl
Forum: Electrical Systems 02-01-2021, 06:52 PM
Replies: 17
Views: 1,704
Posted By Carl Froehlich
I would suspect a bad terminal crimp. Carl

I would suspect a bad terminal crimp.
Carl
Forum: RV-14 02-01-2021, 06:24 PM
Replies: 21
Views: 1,606
Posted By Carl Froehlich
Firewall Forward kit options to consider (pros...

Firewall Forward kit options to consider (pros and cons for each - you decide):
- Delete the alternator if you rather have a B&C alternator
- Delete the prop governor if you want to use the PCU-5000...
Forum: Electrical Systems 02-01-2021, 06:08 PM
Replies: 17
Views: 1,704
Posted By Carl Froehlich
Why not use the same gauge wire to provide the...

Why not use the same gauge wire to provide the engine ground as the wire to the starter?

#4 or #2 welding wire is very flexible and durable - I use it for starter power and engine ground. I ground...
Forum: Glass Cockpit 02-01-2021, 03:03 PM
Replies: 1
Views: 199
Posted By Carl Froehlich
The short answer is no. Use the nice Van’s...

The short answer is no.

Use the nice Van’s ADAHRS wing bracket to mount the ADAHRS modules using the optional stacking plate (assuming you plan on two units). Did this with an RV-14A and the...
Forum: Traditional Aircraft Engines 01-31-2021, 02:21 PM
Replies: 7
Views: 419
Posted By Carl Froehlich
I'm a fan of this product for such applications: ...

I'm a fan of this product for such applications: https://www.aircraftspruce.com/catalog/cspages/tite-seal-04-03925.php

One can will last a half dozen projects.

Carl
Forum: RV-14 01-29-2021, 05:17 PM
Replies: 9
Views: 664
Posted By Carl Froehlich
The IO-390 (like other angle head Lycoming...

The IO-390 (like other angle head Lycoming engines) needs long reach plugs (like the IKH-26). The BR8ES is short reach, for parallel valve Lycoming engines.

Carl
Forum: RV-6/6A 01-29-2021, 11:04 AM
Replies: 17
Views: 714
Posted By Carl Froehlich
+1 Install along the same lines as the...

+1
Install along the same lines as the photo.

Carl
Forum: RV Building Tips/Techniques 01-29-2021, 11:02 AM
Replies: 14
Views: 1,171
Posted By Carl Froehlich
Again, TAS error is not the big issue. Decending...

Again, TAS error is not the big issue. Decending through a layer with OAT reading 38 degrees you may be surprised at the ice you get on the plane - as actual OAT is 30 degrees. Here is where you...
Forum: Electrical Systems 01-28-2021, 05:24 PM
Replies: 11
Views: 1,177
Posted By Carl Froehlich
Considering the rate you are going through...

Considering the rate you are going through batteries, I suggest you have a problem with your charging system, how you use a battery charger, or both.

I run two PC-625 batteries. I replace one every...
Forum: Electrical Systems 01-27-2021, 09:57 AM
Replies: 37
Views: 1,598
Posted By Carl Froehlich
PMag RPM drop doing a regular mag check will...

PMag RPM drop doing a regular mag check will typically be less than you see with a standard mag.
Note - for those running a pMag has a standard mag, RPM drop will be different dependent on how you...
Forum: Electrical Systems 01-27-2021, 08:55 AM
Replies: 37
Views: 1,598
Posted By Carl Froehlich
You can use a standard, old school ignition...

You can use a standard, old school ignition switch with pMags if you want. Wire it so the engine starts on both ignitions. I prefer separate ignitions switches and a start button, regardless of the...
Forum: RV Building Tips/Techniques 01-26-2021, 09:57 AM
Replies: 14
Views: 1,171
Posted By Carl Froehlich
There is no wire in the bell crank area (other...

There is no wire in the bell crank area (other than the wing conduit that passes through the area). I mounted the probes in the bay outboard of the bell crank area. The same bay as the Pitot probe....
Forum: Glass Cockpit 01-26-2021, 09:26 AM
Replies: 27
Views: 2,598
Posted By Carl Froehlich
Exactly not my experience (dual SkyView displays...

Exactly not my experience (dual SkyView displays in an RV-8, 8A, 10 and 14). In the 10 and 14 the right side screen was always the EMS display. Perfectly readable to the pilot. I also have a lot...
Forum: RV Building Tips/Techniques 01-26-2021, 09:18 AM
Replies: 14
Views: 1,171
Posted By Carl Froehlich
I just did this - nine degrees Fahrenheit. This...

I just did this - nine degrees Fahrenheit. This equates to about a two knot high TAS reading. The far more impactful issue however is not having confidence when venturing into freezing conditions...
Forum: RV-10 01-25-2021, 10:59 AM
Replies: 20
Views: 974
Posted By Carl Froehlich
I would first suspect the VPX. Do a run at 100%...

I would first suspect the VPX. Do a run at 100% to find out.

Side note - I ran the trim servo at 100% in my RV-10. I just got use to doing just a bump at speed.

Carl
Forum: RV-10 01-25-2021, 08:29 AM
Replies: 20
Views: 974
Posted By Carl Froehlich
Adjust the VPX to provide 100% at all speeds and...

Adjust the VPX to provide 100% at all speeds and see if that fixes the problem.

Carl
Forum: RV-10 01-21-2021, 11:34 AM
Replies: 19
Views: 1,476
Posted By Carl Froehlich
This is a no-brainer. Build the RV-10. You will...

This is a no-brainer. Build the RV-10. You will be a hero with your wife, have the premier cross country IFR airplane in the sky, and you get all this for just ~$28K more than an RV-14. I also...
Forum: RV General Discussion/News 01-20-2021, 05:48 PM
Replies: 6
AOA
Views: 504
Posted By Carl Froehlich
Dynon SkyView does - I assume others do as...

Dynon SkyView does - I assume others do as well.

Carl
Forum: Electronic Ignition Systems 01-20-2021, 09:10 AM
Replies: 218
Views: 45,170
Posted By Carl Froehlich
Dan, Good data. Can you provide your thoughts...

Dan,

Good data. Can you provide your thoughts as to why you got these results?

Carl
Forum: Electrical Systems 01-19-2021, 05:48 PM
Replies: 13
Views: 1,207
Posted By Carl Froehlich
There is no practical need for an ammeter shunt...

There is no practical need for an ammeter shunt in our modern panel airplanes. Bus voltage alone is a superb indicator of electrical system health. Ammeters are a leftover from when we did not have...
Forum: Safety 01-19-2021, 11:10 AM
Replies: 61
Views: 8,047
Posted By Carl Froehlich
Having a battery in parallel with a noisy charger...

Having a battery in parallel with a noisy charger will only mitigate DC voltage fluctuations (if not too severe). It will do little to filter out the AC hash and various harmonics that will be...
Forum: RV Building Tips/Techniques 01-18-2021, 05:33 PM
Replies: 4
Views: 315
Posted By Carl Froehlich
That is an antenna mount location. Leave it out...

That is an antenna mount location. Leave it out now as you will most likely have the fuselage resting on something.

Easy to put in later.

Carl
Forum: RV-8/8A 01-18-2021, 01:43 PM
Replies: 9
Views: 1,774
Posted By Carl Froehlich
To your questions: - I dislike mounting batteries...

To your questions:
- I dislike mounting batteries on the firewall. I understand the necessity in some RVs (like the RV-14), but I consider the engine side of the firewall a very bad environment for...
Forum: RV-7/7A 01-17-2021, 04:57 PM
Replies: 6
Views: 560
Posted By Carl Froehlich
I used to clean injectors - but followed various...

I used to clean injectors - but followed various people who seem to know what they are talking about and stopped. 100LL by itself is a very good solvent. I do use some carb cleaner spray on the...
Forum: RV Building Tips/Techniques 01-17-2021, 11:20 AM
Replies: 9
Views: 1,542
Posted By Carl Froehlich
I agree you need to prime these pieces. Be...

I agree you need to prime these pieces. Be careful however about putting any paint and/or primer on the exterior surfaces. If you know what paint you will use on the exterior (or your painter of...
Forum: RV Ongoing Maintenance Issues 01-17-2021, 11:07 AM
Replies: 22
Views: 1,780
Posted By Carl Froehlich
I depends on how the builder has the flap pin...

I depends on how the builder has the flap pin inserted. So:
- Lower the flaps.
- Disconnect the flap push rod from the flap and/or the flap actuator bar.
- Let the flap extend all the way down...
Forum: RV Ongoing Maintenance Issues 01-17-2021, 10:46 AM
Replies: 22
Views: 1,780
Posted By Carl Froehlich
CAREFUL use of a hot air gun will help get the...

CAREFUL use of a hot air gun will help get the old tape off. Don’t get carried away as the hot air gun can damage your paint. Use your favorite “goo gone” product if you have any leftover tape...
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