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Search: Posts Made By: Carl Froehlich
Forum: Electrical Systems Today, 04:40 PM
Replies: 9
Views: 280
Posted By Carl Froehlich
Scott, Just to level set, I do not see any...

Scott,

Just to level set, I do not see any advantage (specifically in engine efficiency) offered from an EFII airplane over a dual pMag, standard fuel injected engine, so I have not worked this...
Forum: Traditional Aircraft Engines Today, 12:17 PM
Replies: 11
Views: 454
Posted By Carl Froehlich
Look at my earlier post. I did the same process...

Look at my earlier post. I did the same process with the RV-10 (stock IO-540 and Hartzell BA prop, James Cowl). The engine was LOP ~90% of the time. Fuel burn at 170kts was 12gph low, 9.5gph high....
Forum: Traditional Aircraft Engines Today, 11:48 AM
Replies: 11
Views: 454
Posted By Carl Froehlich
Frank, I suggest that the number of variables...

Frank,

I suggest that the number of variables precludes a common power setting across airframe, engine and prop combinations. For that matter altitude as well.

Propeller efficiency is not linear,...
Forum: COMM Today, 08:17 AM
Replies: 22
Views: 911
Posted By Carl Froehlich
Just to close the loop on a few details. For the...

Just to close the loop on a few details.

For the wingtip antenna you have two choices, buy the Archer product or build. If you build, you must have a way to tune the antenna, such as this: ...
Forum: COMM 05-11-2021, 08:20 PM
Replies: 22
Views: 911
Posted By Carl Froehlich
Again, not my experience. A properly installed...

Again, not my experience.

A properly installed and tuned wingtip VOR antenna will do everything needed in any IFR environment.

Carl
Forum: COMM 05-11-2021, 07:35 PM
Replies: 22
Views: 911
Posted By Carl Froehlich
Exactly not my experience. My wingtip VOR...

Exactly not my experience. My wingtip VOR antenna works at 100+nmi for VORs, and ILS/GS far beyond practical range. The kicker is it cost me ~$2 of hardware beyond some left over aluminum strips. ...
Forum: Electronic Ignition Systems 05-10-2021, 03:55 PM
Replies: 12
Views: 499
Posted By Carl Froehlich
I recommend 93 octane ethanol free as the only...

I recommend 93 octane ethanol free as the only fuel to use other than 100LL. For dual pMags running either this of 100LL I also recommend setting the timing at the base for your engine - 25 degrees...
Forum: Electrical Systems 05-10-2021, 03:45 PM
Replies: 42
Views: 2,066
Posted By Carl Froehlich
I would not consider this as viable. Ground the...

I would not consider this as viable. Ground the engine to the same place you have the battery(s) grounded on the firewall. If the battery(s) are not grounded on the firewall, then I assume you...
Forum: COMM 05-10-2021, 11:12 AM
Replies: 22
Views: 911
Posted By Carl Froehlich
For the 750 (or 650), you just connect the VOR...

For the 750 (or 650), you just connect the VOR antenna to the tray. The 750 does the needed split internally.

The wingtip antenna will do everything you need.

Carl
Forum: Traditional Aircraft Engines 05-10-2021, 10:43 AM
Replies: 16
Views: 679
Posted By Carl Froehlich
As I note you are in Colorado, you have cold, dry...

As I note you are in Colorado, you have cold, dry (low humidity) winters. For our engines, such cold storage is advantageous toward reducing internal engine corrosion.

I suggest that if you use any...
Forum: Electronic Ignition Systems 05-10-2021, 08:03 AM
Replies: 39
Views: 2,099
Posted By Carl Froehlich
I suspect this is not a design goal for Garmin...

I suspect this is not a design goal for Garmin either.

Perhaps some data would provide insight as to if this is a problem or not. How many people flying pMag lost an ignition due to lighting...
Forum: Glass Cockpit 05-09-2021, 11:05 AM
Replies: 12
Views: 647
Posted By Carl Froehlich
Not what I was trying to say. I used the SkyView...

Not what I was trying to say. I used the SkyView network wire for all network connections - other than I listed. For this cable shielding is not an advantage.

Recommend you stay with the standard...
Forum: Glass Cockpit 05-09-2021, 10:21 AM
Replies: 28
Views: 1,689
Posted By Carl Froehlich
I suspect this is the real answer to the OPs...

I suspect this is the real answer to the OPs question. Let us know.

Carl
Forum: Glass Cockpit 05-09-2021, 10:08 AM
Replies: 12
Views: 647
Posted By Carl Froehlich
Keep in mind the network cable from Dynon for the...

Keep in mind the network cable from Dynon for the SkyView install is a bundle of twisted pairs. The twisted pairs provide the means to exclude coupling with other wires.

That said, I do use...
Forum: Electronic Ignition Systems 05-08-2021, 02:14 PM
Replies: 39
Views: 2,099
Posted By Carl Froehlich
Not exactly correct. Here is the blurb from the...

Not exactly correct. Here is the blurb from the pMag install manual for wiring:
1. ď1Ē connects directly to a nearby engine case ground using 18 gauge wire. Note: You cannot rely on the ignitionís...
Forum: Electronic Ignition Systems 05-08-2021, 10:04 AM
Replies: 39
Views: 2,099
Posted By Carl Froehlich
Dual pMags - the only thing Iíd put on an RV. ...

Dual pMags - the only thing Iíd put on an RV. After ~1000 flawless hours on two RVs they have proven themselves reliable while providing measurable gains in cruise efficiency. AND I donít have to...
Forum: RV-14 05-06-2021, 04:20 PM
Replies: 6
Views: 454
Posted By Carl Froehlich
I'm guessing you used the Van's wing wire kit. ...

I'm guessing you used the Van's wing wire kit. Don't.

Use a three #20 conductor shielded wire, like this: https://www.steinair.com/product/20-ga-3-conductor-shielded/

Conductors:
- Nav power
-...
Forum: Electrical Systems 05-05-2021, 11:02 AM
Replies: 8
Views: 758
Posted By Carl Froehlich
+1. Every time I hear someone around here...

+1. Every time I hear someone around here complain about batteries going bad at an early age, I find out they have been using battery tenders/minders/etc. An Odyssey battery is very good at holding...
Forum: RV General Discussion/News 05-03-2021, 04:33 PM
Replies: 6
Views: 386
Posted By Carl Froehlich
$13.65 for the float: ...

$13.65 for the float: https://www.aircraftspruce.com/catalog/inpages/issgauges11.php?clickkey=3008088

Carl
Forum: RV Ongoing Maintenance Issues 05-02-2021, 01:55 PM
Replies: 10
Views: 353
Posted By Carl Froehlich
If not tire balance or dragging brake, then look...

If not tire balance or dragging brake, then look to wheel toe in and camber. As you lift off a side load will be removed - so the wheel reflexes back.

Carl
Forum: Electrical Systems 04-30-2021, 01:04 PM
Replies: 55
Views: 6,696
Posted By Carl Froehlich
Wow. VPX and 16 breakers! In my RV-8 (dual...

Wow. VPX and 16 breakers!
In my RV-8 (dual screen SkyView HDX, GTN-650, Dynon radio, XPDR, dual axis autopilot, ADS-B receiver and all the associated bells and whistles like USB ports, pitot heat,...
Forum: Electrical Systems 04-30-2021, 09:10 AM
Replies: 55
Views: 6,696
Posted By Carl Froehlich
Interesting that buying a box like the ACM or...

Interesting that buying a box like the ACM or perhaps VPX that is supposed to make life easier - does not always fit the bill.

Many builders like an electrical power management box that does...
Forum: RV-14 04-30-2021, 08:59 AM
Replies: 18
Views: 1,768
Posted By Carl Froehlich
Iím curious. It seems many have an alternator...

Iím curious. It seems many have an alternator switch that they turn on after engine start. On all three of my RVs I just have an alternator breaker that is always on (as in I never open the...
Forum: Electrical Systems 04-29-2021, 07:39 PM
Replies: 55
Views: 6,696
Posted By Carl Froehlich
Reminder, pMags have an internal generator, they...

Reminder, pMags have an internal generator, they keep working if you loose all electrical power (RPM above ~800), just like a mag. Power is only needed for start up. EFII engines require the...
Forum: Electrical Systems 04-29-2021, 09:01 AM
Replies: 42
Views: 2,066
Posted By Carl Froehlich
I ground the engine on the starter ground lug on...

I ground the engine on the starter ground lug on all three RVs, using the same #2 or #4 welding wire that provides power to the starter.

The starter is what takes the current, why not provide it...
Forum: RV-8/8A 04-28-2021, 03:22 PM
Replies: 25
Views: 1,639
Posted By Carl Froehlich
Exactly! My first RV-8A does not have the access...

Exactly!

My first RV-8A does not have the access door that I posted. The new RV-8 does. The access door is big enough to replace the battery, get to the bell crank and AP servo. Just finished the...
Forum: RV-8/8A 04-27-2021, 07:20 PM
Replies: 25
Views: 1,639
Posted By Carl Froehlich
I got this from someone else on VAF - happy I...

I got this from someone else on VAF - happy I made it. I would never consider cutting a hole in the skin.

Carl

https://i.postimg.cc/Gp1cNr2X/2700-A211-C218-42-A8-9-D6-C-CBA484-DA6039.jpg
Forum: RV General Discussion/News 04-27-2021, 04:22 PM
Replies: 4
Views: 273
Posted By Carl Froehlich
Epoxy primer and a single stage urethane top...

Epoxy primer and a single stage urethane top coat, just like all the aluminum FWF.

Carl
Forum: RV General Discussion/News 04-27-2021, 09:59 AM
Replies: 29
Views: 1,882
Posted By Carl Froehlich
I do not fly in known icing conditions. But, I...

I do not fly in known icing conditions. But, I have encountered ice, both times while coming down from altitude through a layer (IFR flight plan). Ice accumulated in just a few seconds. I got a...
Forum: RV General Discussion/News 04-26-2021, 06:55 PM
Replies: 29
Views: 1,882
Posted By Carl Froehlich
Nope - but to be fair there is not much exposure...

Nope - but to be fair there is not much exposure to fuel under normal circumstances as the air flow is into the tank. For those days where you fill up and the sun burps a little fuel out the vent...
Forum: RV General Discussion/News 04-26-2021, 06:09 PM
Replies: 29
Views: 1,882
Posted By Carl Froehlich
This is what I did for vent lines on the RV-10...

This is what I did for vent lines on the RV-10 (first two photos). I did a similar setup in the RV-8 (third photo). Note the transition from 1/4” to 3/8” tubing. This provided a better surface...
Forum: RV-8/8A 04-26-2021, 11:05 AM
Replies: 10
Views: 902
Posted By Carl Froehlich
You can do this, if you take into account the...

You can do this, if you take into account the running torque of just the bolt. For example if it takes 10 ft-lb to turn the bolt with no nut (or nut loose), add this to your final torque setting. ...
Forum: RV-8/8A 04-26-2021, 09:21 AM
Replies: 10
Views: 902
Posted By Carl Froehlich
Brian, Just curious, are you using Vanís stock...

Brian,

Just curious, are you using Vanís stock gear or the Grove gear?

If you donít have a helper turning the bolt from the bottom while you hold the nut steady, you will continue to loose your...
Forum: COMM 04-26-2021, 08:30 AM
Replies: 12
Views: 569
Posted By Carl Froehlich
While the GTR200 sensitivity is about the same as...

While the GTR200 sensitivity is about the same as other comm choices, I note the GTR200 selectivity is, based on the one I flew with, less than optimal.

While I suspect this may not have anything...
Forum: Electrical Systems 04-26-2021, 08:11 AM
Replies: 7
Views: 272
Posted By Carl Froehlich
Not my experience, and I do not disable audio...

Not my experience, and I do not disable audio alerts from either display. Here however I do not have two engines and two EMS modules.

Carl
Forum: Electrical Systems 04-25-2021, 03:14 PM
Replies: 7
Views: 272
Posted By Carl Froehlich
The short answer is option #2: - Run the twisted...

The short answer is option #2:
- Run the twisted bundles from the OEM harnesses and splice them together?

I did this on four dual screen SkyView installs, works just fine.

Carl
Forum: RV General Discussion/News 04-25-2021, 09:37 AM
Replies: 22
Views: 1,699
Posted By Carl Froehlich
Just a simple pig tail feeding a 15-20 amp...

Just a simple pig tail feeding a 15-20 amp breaker to connect a 30 amp regulated power supply. The perfect solution to hangar flying, charging batteries, or both at the same time. I use it a lot...
Forum: Safety 04-24-2021, 06:52 PM
Replies: 20
Views: 2,389
Posted By Carl Froehlich
Jump starting a total electrically dependent...

Jump starting a total electrically dependent engine and taking off is why rule #4 was created, ďThe Stupid Shall Be PunishedĒ.

Add to that the apparent zero interest as to why there was a dead...
Forum: RV-8/8A 04-24-2021, 04:18 PM
Replies: 11
Views: 2,410
Posted By Carl Froehlich
Thank you for posting this. Tom Doran (local...

Thank you for posting this. Tom Doran (local RV-8A guy) welded one up for me using 3/8Ē drive socket and crows foot then ground down the crows foot edge after welding. Now the rear nuts in the...
Forum: RV General Discussion/News 04-23-2021, 09:23 AM
Replies: 53
Views: 5,240
Posted By Carl Froehlich
I note two themes: - Leaded fuel is bad (and bad...

I note two themes:
- Leaded fuel is bad (and bad for our engines)
- The search for a drop in replacement for 100LL has been going on for a couple of decades with little to show for it.

I suspect...
Forum: RV Building Tips/Techniques 04-23-2021, 08:00 AM
Replies: 10
Views: 2,042
Posted By Carl Froehlich
+1 Build for maintenance and modifications, and...

+1
Build for maintenance and modifications, and establish a design goal of ďnever on your back with your head under the panelĒ. This is achievable if you take time now for some careful thought. The...
Forum: Mid-Atlantic 04-22-2021, 06:17 PM
Replies: 5
Views: 584
Posted By Carl Froehlich
Flying RV-8 at Dogwood Airpark (VA42) in...

Flying RV-8 at Dogwood Airpark (VA42) in Fredericksburg if you want to drive/fly down. I think there is an RV-4 here as well, but will need to check.

Carl
Forum: RV-6/6A 04-22-2021, 06:15 PM
Replies: 10
Views: 760
Posted By Carl Froehlich
I assume you are using the matching James plenum....

I assume you are using the matching James plenum. Is so, put the nose down after passing ~1000' following take off and climb at a higher IAS. 120- 125 knots (below 5000' or so) should solve your...
Forum: RV Ongoing Maintenance Issues 04-22-2021, 11:39 AM
Replies: 17
Views: 1,632
Posted By Carl Froehlich
Iíve help other RV builders/owners fix heavy wing...

Iíve help other RV builders/owners fix heavy wing problems. In every case there existed a rigging problem needing to be first be resolved.

Here is the short version of how to go about checking your...
Forum: RV Ongoing Maintenance Issues 04-22-2021, 11:17 AM
Replies: 8
Views: 527
Posted By Carl Froehlich
When you put the new one in, remember to grease...

When you put the new one in, remember to grease it. That will make the next time a lot easier.

Same goes for gear legs and such.

Carl
Forum: RV Ongoing Maintenance Issues 04-22-2021, 09:10 AM
Replies: 7
Views: 531
Posted By Carl Froehlich
Happened to me on my RV-10. There are more than...

Happened to me on my RV-10. There are more than one causes, but for me it was a rolled brake piston O ring. Replace it and see if that solves the problem.

When you do this, clean and lightly lube...
Forum: Fiberglass 04-21-2021, 12:44 PM
Replies: 5
Views: 312
Posted By Carl Froehlich
And use white epoxy primer. It reflects heat...

And use white epoxy primer. It reflects heat better and better to find leaks.

Donít forget to add the radiant heat shield along the sides near the exhaust pipes. Vanís sells it along with ACS. ...
Forum: RV Building Tips/Techniques 04-21-2021, 09:19 AM
Replies: 5
Views: 523
Posted By Carl Froehlich
PM sent. Carl

PM sent.

Carl
Forum: RV General Discussion/News 04-19-2021, 05:59 PM
Replies: 8
Views: 550
Posted By Carl Froehlich
You might try Swift. I believe they deliver ~350...

You might try Swift. I believe they deliver ~350 gallon containers of 94UL - but I would assume you will need to buy a full truck of containers to get a worthwhile price.

Carl
Forum: RV-8/8A 04-19-2021, 03:01 PM
Replies: 14
Views: 1,085
Posted By Carl Froehlich
Do not do this. Antenna resonance is determined...

Do not do this. Antenna resonance is determined by antenna length.

Carl
Forum: RV-8/8A 04-19-2021, 12:43 PM
Replies: 14
Views: 1,085
Posted By Carl Froehlich
Yep - but there are work arounds. For the ACK...

Yep - but there are work arounds.

For the ACK ELT (antenna is not a long as you have) you can do a bend near the end that sends the antenna wire under the VS (same deal as bending the tip in your...
Forum: RV-8/8A 04-19-2021, 09:11 AM
Replies: 14
Views: 1,085
Posted By Carl Froehlich
I flew one RV-8 with the antenna mounted as you...

I flew one RV-8 with the antenna mounted as you suggest. It alway got in the way.

Mount it under the empennage fairing and avoid the pain. Three RVs done like this, as will the next one. One...
Forum: RV-14 04-19-2021, 08:41 AM
Replies: 141
Views: 175,984
Posted By Carl Froehlich
Good move to break the trend and move the clunky...

Good move to break the trend and move the clunky Garmin autopilot box down low. Along the same line, I suggest you reverse the Audio Panel and GTN-650 so the GTN-650 is on top. If the GTN-650 is...
Forum: RV General Discussion/News 04-18-2021, 10:39 AM
Replies: 29
Views: 4,633
Posted By Carl Froehlich
#1 RV and #3 RV on the ramp

At KSFQ for breakfast. First time parked side by side. RV-#1 (RV-8A) is meticulously maintained by its new owner, Tom Doran. RV #2 (RV-10) is someplace in Florida enjoying the good life. RV #4...
Forum: RV-12/RV-12iS 04-17-2021, 09:36 AM
Replies: 11
Views: 920
Posted By Carl Froehlich
+1 Iíve seen cobbled together stuff that creates...

+1

Iíve seen cobbled together stuff that creates more pain than performance. The fix is always the same - rip everything out and start over.

Design your end state, then add components that support...
Forum: RV General Discussion/News 04-17-2021, 09:22 AM
Replies: 32
Views: 2,081
Posted By Carl Froehlich
Evan, Some thoughts: - pMag timing advance if...

Evan,

Some thoughts:
- pMag timing advance if much more about cruise efficiency than power. For that matter, full rated power (take off) timing with a pMag set per the instructions (at TDC for...
Forum: RV-14 04-16-2021, 05:08 PM
Replies: 11
Views: 1,153
Posted By Carl Froehlich
+1. Your EGTs suggest you are flying around at...

+1. Your EGTs suggest you are flying around at full rich. Not good for your wallet or your engine (plug fouling, stuck exhaust valve, etc.).

If you CHTs remain that low at leaner mixtures it...
Forum: RV General Discussion/News 04-15-2021, 10:03 AM
Replies: 24
Views: 3,983
Posted By Carl Froehlich
I’m just guessing, but if I was Van’s I’d make a...

I’m just guessing, but if I was Van’s I’d make a “something like a 180”. Four seats but good hauler if the rear seats are out, a little faster, a little lighter and running the new 215HP IO-390...
Forum: Electrical Systems 04-15-2021, 09:40 AM
Replies: 15
Views: 1,076
Posted By Carl Froehlich
You still need a switch to transfer the mic input...

You still need a switch to transfer the mic input from Comm #1 to Comm #2. A simple DPDT toggle switch on the panel is the simple way to switch both mic and PTT inputs.

Use the extra stick switch...
Forum: COMM 04-11-2021, 04:19 PM
Replies: 3
Views: 520
Posted By Carl Froehlich
Exact same symptom if either terminal screw is...

Exact same symptom if either terminal screw is loose on the associated breaker terminals.

Carl
Forum: RV-10 04-08-2021, 07:03 PM
Replies: 7
Views: 1,350
Posted By Carl Froehlich
David - what exhaust did you use? Carl

David - what exhaust did you use?

Carl
Forum: RV-7/7A 04-08-2021, 06:09 PM
Replies: 15
Views: 1,114
Posted By Carl Froehlich
But I suggest this is a problem mostly associated...

But I suggest this is a problem mostly associated with radio in use. For example, the GTR-200 radio exhibits this problem - so much that Garmin has this line you connect between the GTN-650 and the...
Forum: RV-7/7A 04-08-2021, 05:23 PM
Replies: 15
Views: 1,114
Posted By Carl Froehlich
Yep - I should have picked my words much...

Yep - I should have picked my words much better.....

Carl
Forum: RV-7/7A 04-08-2021, 05:16 PM
Replies: 15
Views: 1,114
Posted By Carl Froehlich
A comm antenna on top is truely ugly. Donít do...

A comm antenna on top is truely ugly. Donít do it. The concept that the tower cannot hear you on the ground violates basic RF propagation rules. VHF line of sight is by no means ďif I canít see...
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