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Search: Posts Made By: hgerhardt
Forum: RV General Discussion/News Today, 05:45 PM
Replies: 17
Views: 1,891
Posted By hgerhardt
Good time to remind folks that Solidworks is...

Good time to remind folks that Solidworks is available free for EAA members....
Forum: RV Building Tips/Techniques Today, 05:41 PM
Replies: 6
Views: 801
Posted By hgerhardt
Indeed. I agree it looks like over-deburred...

Indeed. I agree it looks like over-deburred holes. You can see the "countersink" mark in the lowest dimpled hole in the photo. If this is really what's going on here, I'd be concerned about the...
Forum: RV Ongoing Maintenance Issues 02-09-2020, 07:45 PM
Replies: 59
Views: 30,330
Posted By hgerhardt
One thing I've never seen posted here is why not...

One thing I've never seen posted here is why not build internal filter supports on the upper and lower sides of the FAB? Those would effectively hold the filter in its proper dimension. Back in the...
Forum: GPS 02-02-2020, 09:12 PM
Replies: 11
Views: 1,861
Posted By hgerhardt
Had problems updating the WAAS part too. Gave up...

Had problems updating the WAAS part too. Gave up after about 4 tries. Cycled power, installed new nav database, cycled power again and then tried installing the WAAS part again and this time it...
Forum: Traditional Aircraft Engines 01-27-2020, 01:57 PM
Replies: 7
Views: 579
Posted By hgerhardt
IF you do have a front-mount governor, the rear...

IF you do have a front-mount governor, the rear hydraulic pump pad (which is about where the governor would go if rear-mounted) can handle 100/800 in-lb (again per my previously-referenced TCDS) and...
Forum: Traditional Aircraft Engines 01-26-2020, 04:45 PM
Replies: 7
Views: 579
Posted By hgerhardt
The TCDS...

The TCDS (https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/299FA3D6AEF0BA048625821E0072188A?OpenDocument) shows max torque of 70 in-lb continuous and 450 in-lb static with an...
Forum: RV General Discussion/News 01-24-2020, 01:44 PM
Replies: 14
Views: 1,038
Posted By hgerhardt
Those are $186 and 7 lbs, so actually a little...

Those are $186 and 7 lbs, so actually a little heavier than the MP's.
Forum: RV General Discussion/News 01-24-2020, 12:32 PM
Replies: 14
Views: 1,038
Posted By hgerhardt
Michelin Pilot tires

Anyone tried the Michelin Pilot 5.00-5 tires (https://www.aircraftspruce.com/catalog/lgpages/michpilot_06-03068.php)? Most expensive ones out there, at $214. According to the specs, they're 6.6...
Forum: Electronic Ignition Systems 01-20-2020, 11:29 PM
Replies: 14
Views: 1,082
Posted By hgerhardt
Again, read the archives. It's been done several...

Again, read the archives. It's been done several times just on VAF.
Forum: Electronic Ignition Systems 01-20-2020, 09:07 PM
Replies: 14
Views: 1,082
Posted By hgerhardt
Search the archives for a how-to on installing a...

Search the archives for a how-to on installing a single mag. It's a certain Bendix mag required.
Forum: RV-7/7A 01-16-2020, 08:05 PM
Replies: 81
Views: 11,860
Posted By hgerhardt
So in 13 years and 60+ replies with lots of...

So in 13 years and 60+ replies with lots of hand-wringing and (good) advice, NO ONE has really answered the OP's question.

DC came close by posting Van's rationale of flutter testing and what I...
Forum: Traditional Aircraft Engines 01-12-2020, 11:06 AM
Replies: 14
Views: 1,282
Posted By hgerhardt
Two things stand out to me from your photo: (1)...

Two things stand out to me from your photo:

(1) you don't need to purge the lines to the sensors (air transfers pressure just as well as liquid).

(2) Take the sharp corners off the SkyBolt tabs or...
Forum: RV Ongoing Maintenance Issues 01-11-2020, 03:59 PM
Replies: 65
Views: 5,987
Posted By hgerhardt
I haven't had one in 13 years and 810 hours. Last...

I haven't had one in 13 years and 810 hours. Last CI I removed the intake tubes to replace the gaskets as I do about every other year (someday I'll install Ross' deal) and as usual there was no more...
Forum: RV-14 01-06-2020, 07:53 PM
Replies: 17
Views: 1,615
Posted By hgerhardt
I installed a 2-1/2" Visaton speaker...

I installed a 2-1/2" Visaton speaker (https://www.amazon.com/Visaton-7-4-2-1-Full-Range-Driver/dp/B004GA0LFY) in my subpanel about 6" away from the audio panel in a preexisting lightening hole.

But...
Forum: RV General Discussion/News 12-30-2019, 06:55 PM
Replies: 55
Views: 6,020
Posted By hgerhardt
Reminds me of the old saying: ďIf you have time...

Reminds me of the old saying: ďIf you have time to spareógo by air.Ē
Forum: Electrical Systems 12-22-2019, 02:47 PM
Replies: 3
Views: 647
Posted By hgerhardt
That's not what Odyssey says in their Technical...

That's not what Odyssey says in their Technical Manual (https://www.odysseybattery.com/documents/US-ODY-TM.pdf):

"Mounting flexibility
Installing the ODYSSEY battery in any orientation other than...
Forum: Electrical Systems 12-11-2019, 09:52 PM
Replies: 5
Views: 811
Posted By hgerhardt
Why don't you unbolt the solenoid so that you can...

Why don't you unbolt the solenoid so that you can see the plunger end of it? Then you can compare it to an off-the-shelf unit on a site like rockauto.com which has nice illustrations of their parts....
Forum: RV General Discussion/News 12-02-2019, 05:19 PM
Replies: 40
Views: 4,726
Posted By hgerhardt
Seems like I read somewhere that Li-xx batteries...

Seems like I read somewhere that Li-xx batteries like to be warmed up before outputting high current, especially if the battery is cold-soaked. I think that came from EarthX's site. They recommend to...
Forum: Propellers 11-29-2019, 01:26 PM
Replies: 19
Views: 3,060
Posted By hgerhardt
If I let my airplane sit for 2 weeks it takes...

If I let my airplane sit for 2 weeks it takes several seconds for the prop to cycle for the first time. Flying daily it doesn't do this.
Forum: Traditional Aircraft Engines 11-29-2019, 01:19 PM
Replies: 10
Views: 1,096
Posted By hgerhardt
Not all of the male thread adapters require a...

Not all of the male thread adapters require a filter with bypass. The single-drive Dual-Mag engines have a bypass valve and male threads.
Forum: RV General Discussion/News 11-27-2019, 01:56 PM
Replies: 38
Views: 7,970
Posted By hgerhardt
$180 at Amazon...

$180 at Amazon (https://www.amazon.com/MoJack-EZ-Residential-Capacity-Industry/dp/B00332FB9W), but you do still need to modify it. Good excuse to get that TIG welder...
Forum: RV-12/RV-12iS 11-16-2019, 07:13 PM
Replies: 10
Views: 1,186
Posted By hgerhardt
I just looked at McMaster-Carr and all the torx...

I just looked at McMaster-Carr and all the torx flat heads they have are 82 deg. All the phillips flat heads supplied by Van's are 100 deg, and that's also the angle of dimple dies. If you want to...
Forum: RV Ongoing Maintenance Issues 11-12-2019, 11:34 PM
Replies: 7
Views: 10,752
Posted By hgerhardt
I received a rebuilt LS from Sky-Tec and the...

I received a rebuilt LS from Sky-Tec and the solenoid lasted just a few hours... failed in Furnace Creek, Death Valley of all places. That experience is what drove me to figure out these LS...
Forum: Traditional Aircraft Engines 11-09-2019, 11:41 AM
Replies: 30
Views: 2,940
Posted By hgerhardt
I'd leave it alone. The main purpose of the...

I'd leave it alone. The main purpose of the Wobble Test is to identify insufficient clearance, which leads to stuck valves. Your oil consumption is great and the valves don't show signs of distress.
Forum: RV Photo/Video URLs 11-09-2019, 11:35 AM
Replies: 6
Views: 1,592
Posted By hgerhardt
I've seen it from the rim a few times, and it is...

I've seen it from the rim a few times, and it is truly impressive, but I never got the impression of the deep blue color that you get when flying over it with the sun at the right...
Forum: RV Ongoing Maintenance Issues 11-07-2019, 10:42 PM
Replies: 0
Views: 387
Posted By hgerhardt
Alternator diagnosis

In the spirit of 'education and recreation', here's a good article on diagnosing alternators: https://www.motor.com/magazine-summary/alternator-ripple-effect/
You can get an oscilloscope for a pretty...
Forum: Job Board 11-06-2019, 01:59 PM
Replies: 35
Views: 4,444
Posted By hgerhardt
He's lucky that he's graduating at a time when...

He's lucky that he's graduating at a time when major aerospace firms are hiring. Northrop Grumman has plenty of openings for aerospace engineering types at Melbourne, FL, Palmdale, CA, and El Segundo...
Forum: RV-10 10-28-2019, 11:16 PM
Replies: 44
Views: 7,189
Posted By hgerhardt
The Kavlico ...

The Kavlico (http://www.kavlico.com/kavlico-pressure/pressure-products/ceramic-capacitive-pressure-sensors/p528)pressure sensors typically are 0.5V at zero PSI and 4.5V at max pressure, which is...
Forum: Safety 10-24-2019, 07:10 PM
Replies: 48
Views: 11,666
Posted By hgerhardt
That's the main reason why I don't bolt in the...

That's the main reason why I don't bolt in the passenger stick. Only thing holding it in is the PTT cable, which is easy enough to rip out the connector at the base of the stick if I'm in a real...
Forum: RV-14 10-22-2019, 05:15 PM
Replies: 20
Views: 3,379
Posted By hgerhardt
Actually, it's LiFePO4, so you're both somewhat...

Actually, it's LiFePO4, so you're both somewhat correct. (4 in subscript)
Forum: Electrical Systems 10-17-2019, 02:05 PM
Replies: 8
Views: 1,167
Posted By hgerhardt
Probably one of the 8 rectifier diodes in the...

Probably one of the 8 rectifier diodes in the alternator is bad which: 1) limits output, especially at low RPM, and 2) bleeds AC voltage into the bus which the radios don't like.

If this is the...
Forum: RV Ongoing Maintenance Issues 10-08-2019, 09:54 PM
Replies: 12
Views: 5,326
Posted By hgerhardt
Nah. Why carry around all that weight? All you...

Nah. Why carry around all that weight? All you need to find is an auto parts store and ask for a 2000 Crown Vic starter solenoid.
Forum: RV Building Tips/Techniques 10-08-2019, 03:28 PM
Replies: 6
Views: 819
Posted By hgerhardt
Remember that Van's used to supply non-honeycomb,...

Remember that Van's used to supply non-honeycomb, wet layup cowls made from polyester resin/fiberglass and they hold up okay too. I made mods to my old polyester cowl to accommodate the IO-360 and...
Forum: RV-10 10-03-2019, 11:08 PM
Replies: 44
Views: 7,189
Posted By hgerhardt
No, it starts at zero psig. You will have a...

No, it starts at zero psig. You will have a manifold-gauges setup installed when you evacuate/charge the system, so there's really no need to have the sensor tell you that.
Forum: Traditional Aircraft Engines 10-01-2019, 10:01 PM
Replies: 22
Views: 1,846
Posted By hgerhardt
I've been playing with my a/c system to see what...

I've been playing with my a/c system to see what kind of decrease in airspeed there is while compressor is engaged. Was looking at IAS on my G3X because its resolution is 10ths of a knot. The...
Forum: RV General Discussion/News 09-30-2019, 10:24 PM
Replies: 6
Views: 1,122
Posted By hgerhardt
You know you're in SoCal when...

...100LL costs $4.15/gal and 91 octane 'premium' is $4.599/gal.
Forum: Traditional Aircraft Engines 09-26-2019, 10:22 PM
Replies: 4
Views: 542
Posted By hgerhardt
Marman is to V-band clamps as Velcro is to...

Marman is to V-band clamps as Velcro is to hook-and-loop and Saran is to clingy plastic wrap.

Marman was I think the original manufacturer of that type of clamp. And now part of Eaton.
Forum: Traditional Aircraft Engines 09-26-2019, 05:54 PM
Replies: 4
Views: 542
Posted By hgerhardt
From this website you can figure out what size...

From this website you can figure out what size you need: http://www.clampco.com/products/v-band.asp
Hopefully it's a standard size. Custom ones get expensive.
Forum: RV-10 09-24-2019, 02:08 PM
Replies: 44
Views: 7,189
Posted By hgerhardt
Instead of welding, think about brazing. That's...

Instead of welding, think about brazing. That's how automotive AC plumbing is joined. I used Lucas-Milhaupt AL822 (https://www.amazon.com/Lucas-Milhaupt-Aluminum-Soldering-Copper/dp/B01MTSURG2) to...
Forum: RV-10 09-23-2019, 10:06 PM
Replies: 44
Views: 7,189
Posted By hgerhardt
You could also use a pair of inline beadlock...

You could also use a pair of inline beadlock service port splicer...
Forum: RV General Discussion/News 09-23-2019, 05:01 PM
Replies: 33
Views: 4,897
Posted By hgerhardt
Flew "around the block" in 86F ambient with 55F...

Flew "around the block" in 86F ambient with 55F blowing in my face. Lovely!
Forum: Traditional Aircraft Engines 09-18-2019, 11:21 PM
Replies: 9
Views: 1,251
Posted By hgerhardt
"Power Steering Return" hose is good for this...

"Power Steering Return" hose is good for this application: hot oil under low pressure. I installed mine 16 years ago and it still looks like new.
Forum: RV-10 09-18-2019, 04:32 PM
Replies: 44
Views: 7,189
Posted By hgerhardt
I used a Honda evap temp sensor which I got cheap...

I used a Honda evap temp sensor which I got cheap on ebay. It's a 10k thermistor tied into my custom AC controller PCB, which outputs 0-5V for the G3X input.

But, for you to make a standalone temp...
Forum: RV-10 09-09-2019, 07:45 PM
Replies: 44
Views: 7,189
Posted By hgerhardt
Yes, there's an O-ring that fits in the smooth...

Yes, there's an O-ring that fits in the smooth area below the threads of the adapter. This kit should have what you need: https://www.amazon.com/26729-Ring-Gasket-Conditioning-System/dp/B000C2M8Q0/...
Forum: RV-10 09-06-2019, 01:11 PM
Replies: 44
Views: 7,189
Posted By hgerhardt
I'm using the data for system development, so for...

I'm using the data for system development, so for me it IS useful. As from an operational standpoint, knowing the hi-side pressure is interesting as you could regulate it somewhat by varying your...
Forum: RV-10 09-04-2019, 08:19 PM
Replies: 44
Views: 7,189
Posted By hgerhardt
Your idea is great (well, because it works well...

Your idea is great (well, because it works well for me!), but I'd use a refrigerant pressure sensor instead of a generic transducer.

Use this sensor:...
Forum: RV-14 09-04-2019, 02:53 PM
Replies: 24
Views: 5,037
Posted By hgerhardt
I agree it looks like corrosion. Is the airplane...

I agree it looks like corrosion. Is the airplane parked outdoors? Could rain/dew have leaked onto the cable, and with the cable exiting the cube vertically and to the rear, could that cable have...
Forum: Electronic Ignition Systems 08-31-2019, 03:35 PM
Replies: 9
Views: 887
Posted By hgerhardt
The 4-cyl Dual-Mag engines have a pressurized oil...

The 4-cyl Dual-Mag engines have a pressurized oil port in the bore which supports the mag gear on the crankcase side. I don't know if the 6-cyl Dual-Mag engines do too, but if they do, you'll need to...
Forum: Traditional Aircraft Engines 08-11-2019, 01:28 PM
Replies: 3
Views: 511
Posted By hgerhardt
Thatís not a drainback hole. Itís the pressurized...

Thatís not a drainback hole. Itís the pressurized source for wet vacuum pumps. Just use a gasket as is and bolt on the plate. The splined shaft has a seal, so no worries about having to drain that...
Forum: Electronic Ignition Systems 07-27-2019, 04:17 PM
Replies: 69
Views: 22,016
Posted By hgerhardt
As for Lightspeed, you can connect a simple 10k...

As for Lightspeed, you can connect a simple 10k potentiometer to the box to be able to shift the existing timing curve up or down or both (forgot which), and you can connect an output of the box to...
Forum: Electrical Systems 07-26-2019, 01:11 PM
Replies: 51
Views: 4,269
Posted By hgerhardt
your crowbar?

With all this analyzing OP wants us to start doing... this seems like a good time to ask why we don't all have overvoltage tripping devices installed in our airplanes?

B&C and PlanePower...
Forum: RV-14 07-20-2019, 01:23 PM
Replies: 15
Views: 1,385
Posted By hgerhardt
Why do you need a metallic cap for the tach...

Why do you need a metallic cap for the tach drive? You don't really need anything there, as the shaft has a seal. It would be desirable to have a dust cap over it, and for that I've had a vinyl cap...
Forum: Traditional Aircraft Engines 07-20-2019, 01:06 PM
Replies: 9
Views: 1,501
Posted By hgerhardt
1. Heat transfer? How so? This would be a problem...

1. Heat transfer? How so? This would be a problem only if the spark plug were longer than the adapter. In Bill's case, the entire length of threads of the plug is in contact with the adapter, so the...
Forum: RV General Discussion/News 07-08-2019, 10:07 PM
Replies: 37
Views: 11,311
Posted By hgerhardt
Why a ball bearing there?

Crazy how many variations Lycoming used over the years... the IO-360-A3B6D (Bendix D3000 Dual-Mag) also has a stub shaft to support the magneto gear like this IO-540, but with the 360-D engine, the...
Forum: RV General Discussion/News 07-06-2019, 02:36 PM
Replies: 37
Views: 11,311
Posted By hgerhardt
Judging by how chewed up the mag gear teeth are,...

Judging by how chewed up the mag gear teeth are, I'd assume the mating gear in the accessory case looks equally bad. So, at this point, really your only option is to pull the engine so that you can...
Forum: Tools 06-17-2019, 04:08 PM
Replies: 5
Views: 742
Posted By hgerhardt
Yeah, a caulk gun works, but the Semco has better...

Yeah, a caulk gun works, but the Semco has better control, and is just much nicer to use.
Forum: Traditional Aircraft Engines 06-12-2019, 05:47 PM
Replies: 22
Views: 2,956
Posted By hgerhardt
The combination you reference (which is the...

The combination you reference (which is the McCauley paddle blades together with the -A3B6D clocking) might have been awful on your -8, but it's not the clocking necessarily that made it bad, it's...
Forum: Traditional Aircraft Engines 06-10-2019, 11:07 PM
Replies: 22
Views: 2,956
Posted By hgerhardt
John, I have that exact engine in my -6. I...

John, I have that exact engine in my -6. I "solved" the Dual-Mag issue with dual crank-triggered Lightspeeds, although the later D3000 mag is allegedly quite good (I used mine for the first 100 hours...
Forum: California 05-24-2019, 11:38 PM
Replies: 43
Views: 9,552
Posted By hgerhardt
I talked with Dennis in the tower a few weeks ago...

I talked with Dennis in the tower a few weeks ago and was told that existing memberships were extended by I think 6 months.

Also, that open house tomorrow is allegedly free from landing fee.
Forum: RV-6/6A 05-21-2019, 05:17 PM
Replies: 5
Views: 641
Posted By hgerhardt
Every couple of years I take apart the rollers...

Every couple of years I take apart the rollers and lube them with silicone grease. Seems to last about 50 hours. Waxing the rail in the rear helps too. With the canopy removed to lube the wheels is a...
Forum: Traditional Aircraft Engines 05-16-2019, 12:21 PM
Replies: 11
Views: 2,321
Posted By hgerhardt
Dan, why not use the primer port in the head?...

Dan, why not use the primer port in the head? That's pretty close to the gasket interface where the intake tube mounts, and with the engine running should be plenty of gas flow to get reasonably...
Forum: RV-10 05-04-2019, 07:11 PM
Replies: 10
Views: 947
Posted By hgerhardt
Sorry, I misread your request. A fitting like...

Sorry, I misread your request. A fitting like that you'd have to fabricate by brazing or welding like the Z-fitting you posted was. Maybe Bill has something like that available?
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