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Search: Posts Made By: lr172
Forum: Traditional Aircraft Engines Today, 11:56 AM
Replies: 18
Views: 1,097
Posted By lr172
In aviation, only "straight mineral oil" means no...

In aviation, only "straight mineral oil" means no ADs. XC20W50 is a mineral oil, but also has ADs.

Lary
Forum: Traditional Aircraft Engines Today, 11:40 AM
Replies: 18
Views: 1,097
Posted By lr172
according to shell: Please provide a reference...

according to shell:



Please provide a reference where lycoming requires a non disppersent oil, outside of the break in period. The quote that I provided from lycoming states the opposite - that an...
Forum: Electrical Systems 05-21-2022, 08:28 AM
Replies: 8
Views: 367
Posted By lr172
+1 In addition to dropping the current...

+1

In addition to dropping the current downstream of the resistor, it will also act as a fusible link. a 1/4 watt resistor cannot pass a lot of current before it's internals vaporize and open the...
Forum: Glass Cockpit 05-21-2022, 08:20 AM
Replies: 10
Views: 341
Posted By lr172
three condcutor wire is the norm for RTDs. I...

three condcutor wire is the norm for RTDs. I believe that the negative gets one conductor and the positive gets the doubled conductor.

Larry
Forum: RV General Discussion/News 05-21-2022, 08:03 AM
Replies: 11
Views: 651
Posted By lr172
In my experience, the G3X uses an excessive...

In my experience, the G3X uses an excessive amount of sensor data "smoothing" in it's software. Many times a developer codes in smoothing algorithms to avoid presenting jerkiness in sensor based...
Forum: RV Building Tips/Techniques 05-21-2022, 07:59 AM
Replies: 9
Views: 851
Posted By lr172
Let me know if the B/O is months. I can make you...

Let me know if the B/O is months. I can make you a flange. Have a lathe and mill and always looking for a project to make a couple dollars. Probably couldn't do it for $40 bucks as the cost of...
Forum: Traditional Aircraft Engines 05-21-2022, 07:52 AM
Replies: 5
Views: 299
Posted By lr172
I used a different fitting that can be installed...

I used a different fitting that can be installed with the engine on the mount. It is a brass fitting that is block shaped with a 1/8 NPT male on one side and a 1/8" NPT female in a 90* orientation...
Forum: RV Building Tips/Techniques 05-20-2022, 11:58 AM
Replies: 5
Views: 529
Posted By lr172
I did the same, except extended the Al piece out...

I did the same, except extended the Al piece out past the filter outside diameter. This eliminates the F/G bottom from wearing away due to the filter rubbing on it.

Oops, my bad. See that Carl did...
Forum: Glass Cockpit 05-20-2022, 11:55 AM
Replies: 10
Views: 341
Posted By lr172
I made one with a custom Al enclosure and if I...

I made one with a custom Al enclosure and if I recall correctly, it was a PT500 (meaning 500 ohms at 0C) platinum RTD. Got it from Digikey.
Forum: Traditional Aircraft Engines 05-20-2022, 11:45 AM
Replies: 10
Views: 1,820
Posted By lr172
Those are carbon chunks from oil burning and...

Those are carbon chunks from oil burning and coking around the rings and lands. The engine will burn a good bit of oil in the first couple of hours and those carbon chunks are a byproduct. The fact...
Forum: Traditional Aircraft Engines 05-20-2022, 10:59 AM
Replies: 18
Views: 1,097
Posted By lr172
just about ALL commonly used aviation oils,...

just about ALL commonly used aviation oils, mineral based or otherwise, except specific, "break in oils" use ashless disspersant additives. Calling it "mineral oil" means that the base stocks are...
Forum: Traditional Aircraft Engines 05-20-2022, 08:10 AM
Replies: 18
Views: 1,097
Posted By lr172
Not something I would do and I always look for a...

Not something I would do and I always look for a way to save a buck. Aviation oils have significant dispersent packages in order to handle the load of lead deposits that find their way into the oil....
Forum: RV-10 05-20-2022, 07:52 AM
Replies: 5
Views: 431
Posted By lr172
No surefly, but do have EI in my 10. I feel that...

No surefly, but do have EI in my 10. I feel that I am saving close to one GPH at cruise by having more than 25* of advance, along with balanced injectors. I flew back from Iowa yesterday and at 7K'...
Forum: RV Ongoing Maintenance Issues 05-17-2022, 11:31 AM
Replies: 14
Views: 656
Posted By lr172
I think it is just a very high stress area with...

I think it is just a very high stress area with huge centrifugal forces. I still lose one screw in the spinner on my 6 every 100 or so hours; Always from the smaller, more foreward bulkhead.
Forum: Electronic Ignition Systems 05-17-2022, 11:25 AM
Replies: 244
Views: 87,309
Posted By lr172
I think there may be some variance in where the...

I think there may be some variance in where the top and bottom plugs are. It could also be that the mixture concentrations are different from top to bottom and this causes differences in the flame...
Forum: RV-12/RV-12iS 05-17-2022, 09:42 AM
Replies: 28
Views: 3,028
Posted By lr172
It is not really age discrimination if the...

It is not really age discrimination if the actuarial tables show greater accident frequency once a pilot hits a certain age. No different than that crazy insurance rates we see when our 16 year...
Forum: Electronic Ignition Systems 05-17-2022, 08:17 AM
Replies: 244
Views: 87,309
Posted By lr172
Sorry, but this is wrong. The amount of RPM drop...

Sorry, but this is wrong.

The amount of RPM drop during a mag check is directly related to WHERE the spark occurs relative to TDC on the one running ignition compared to where it occurs on both...
Forum: RV Ongoing Maintenance Issues 05-17-2022, 08:05 AM
Replies: 15
Views: 1,961
Posted By lr172
A shaving of that size and shape simply can't...

A shaving of that size and shape simply can't make it from the combusion chamber to the oil pan at least not while maintining it's shape. Something similar to what the OP posted must have come from...
Forum: RV-12/RV-12iS 05-17-2022, 08:00 AM
Replies: 28
Views: 3,028
Posted By lr172
I agree. I had my son get his PPL in my 6A last...

I agree. I had my son get his PPL in my 6A last year. I was paying $900 for full coverage and they wanted $4500 after adding him as a student. I ended up going with liability only for $1700. I...
Forum: Electronic Ignition Systems 05-16-2022, 11:24 AM
Replies: 244
Views: 87,309
Posted By lr172
This would be my guess. As long as power is not...

This would be my guess. As long as power is not cut to the CPU, the s/w should be able to maintain the crank position and a s/w change should shorten ramp up with just a p lead on/off cycle,...
Forum: Electronic Ignition Systems 05-16-2022, 11:20 AM
Replies: 244
Views: 87,309
Posted By lr172
I have never tried it, but speculate that it may...

I have never tried it, but speculate that it may not work. The clamp is measuring inductance from when the energy field collapses. The primary purpose of shielding is to capture this and drain it...
Forum: Electrical Systems 05-14-2022, 07:08 AM
Replies: 10
Views: 694
Posted By lr172
It would be my assumption that applying 12VDC...

It would be my assumption that applying 12VDC (likely wired from the avionics master switch) to the avionics master pin would force the unit to turn on. However, I have never installed one. If the...
Forum: Electronic Ignition Systems 05-14-2022, 06:56 AM
Replies: 244
Views: 87,309
Posted By lr172
re-read your original post and missed a couple...

re-read your original post and missed a couple things. If you get stumbles or backfires, something is wrong and likely beyond basic timing. If it is just timing issues causing backfires, it will be...
Forum: Electronic Ignition Systems 05-13-2022, 07:49 AM
Replies: 244
Views: 87,309
Posted By lr172
RPM drops should be similar if both timing...

RPM drops should be similar if both timing advances are equal. Therefore, with a 50 RPM spread between the mag and the surefly, I would speculate that they are not the same. Have you checked the...
Forum: Electrical Systems 05-13-2022, 07:06 AM
Replies: 18
Views: 1,047
Posted By lr172
I thought it was from a late 80's civic. Here is...

I thought it was from a late 80's civic. Here is an interchange list. https://www.ebay.com/itm/254898487444 I think it was 021000-5640

I do have a remy 14158 on one of the planes and it has gone...
Forum: Painting your RV 05-12-2022, 10:27 AM
Replies: 3
Views: 441
Posted By lr172
2 stage is base coat plus clear coat. Base coat...

2 stage is base coat plus clear coat. Base coat weighs almost nothing. Weight is in the primer and clear. Single stage mixes the pigments with the clear coat, eliminating the base coat. The fact...
Forum: RV General Discussion/News 05-12-2022, 08:16 AM
Replies: 10
Views: 639
Posted By lr172
+1 On my 6, I have one of those buttons for a...

+1

On my 6, I have one of those buttons for a GRT screen swap. I am surprised how often I inadvertently hit that button, especially in turbulence. I don't know about you, but I WOULD NOT want my...
Forum: Traditional Aircraft Engines 05-12-2022, 08:05 AM
Replies: 12
Views: 1,556
Posted By lr172
turbo normalized means it won't boost higher than...

turbo normalized means it won't boost higher than 30", which is what you get at take off from a sea level airport. Therefore, if you trust your 10:1 engine to not detonate at TO, it should be fine....
Forum: Electrical Systems 05-12-2022, 07:54 AM
Replies: 18
Views: 1,047
Posted By lr172
lester 14158. It is ext regulated, 45 amps and...

lester 14158. It is ext regulated, 45 amps and counter clockwise rotation (most auto applications are CW). You have to do some digging to find the ND part number for this alt. Once you do, you can...
Forum: RV General Discussion/News 05-12-2022, 07:26 AM
Replies: 20
Views: 2,082
Posted By lr172
It is most definitely not required by law and can...

It is most definitely not required by law and can be dangerous to the unaware on low wing airplanes. In non gravity feed airplanes, if the selector is set to both, the engine will stop running once...
Forum: RV-8/8A 05-10-2022, 11:10 AM
Replies: 5
Views: 536
Posted By lr172
excluding the environmental impacts, alodine is...

excluding the environmental impacts, alodine is great stuff with no downside. It inhibits corrosion and is also an adhesion promoter for the paint. That said, proper prep with an epoxy primer...
Forum: Electrical Systems 05-10-2022, 11:07 AM
Replies: 18
Views: 1,047
Posted By lr172
I like the denso externally regulated alt's with...

I like the denso externally regulated alt's with either a B&C regulator or other quality aftermarket regulator. 800 uneventfull hours with this on the 6 and 250 on the 10. I would not buy an after...
Forum: RV General Discussion/News 05-10-2022, 07:44 AM
Replies: 10
Views: 666
Posted By lr172
can't help on the aerodynamics, but I found that...

can't help on the aerodynamics, but I found that the TE shape didn't influence my heavy wing much. I had to move the Aileron up and down at the hinge for a meaningful change in behavior. I did,...
Forum: Traditional Aircraft Engines 05-09-2022, 10:48 AM
Replies: 23
Views: 1,689
Posted By lr172
First, a lycoming does not have cyl hold down...

First, a lycoming does not have cyl hold down bolts. There are studs in the case and nuts are used to hold the cylinders on. No one replaces these at overhaul, nor does Lyc require it. Also, all...
Forum: Traditional Aircraft Engines 05-09-2022, 07:32 AM
Replies: 23
Views: 1,689
Posted By lr172
I have reused cyl hold down nuts. If they pass a...

I have reused cyl hold down nuts. If they pass a visual inspection, I don't believe they are a required or even recommended replacement. Let Divco or whoever is overhauling your case decide on the...
Forum: RV General Discussion/News 05-07-2022, 06:16 AM
Replies: 15
Views: 1,009
Posted By lr172
If I had a partner, I would set up a plane fund...

If I had a partner, I would set up a plane fund with reserves used for fuel and maintnence-funded equal by partners on a regular basis) and fuel would be paid for by the fund - separate card. Pilots...
Forum: RV Ongoing Maintenance Issues 05-06-2022, 10:37 AM
Replies: 22
Views: 1,892
Posted By lr172
what is the idle speed at full operating temp? ...

what is the idle speed at full operating temp? The fact that ti does 700 RPM before take off doesn't mean it will still be that speed after heat soaking. If the speed is above 700 at full operating...
Forum: RV Ongoing Maintenance Issues 05-05-2022, 11:00 AM
Replies: 23
Views: 1,949
Posted By lr172
light bulbs going off now. I assume this is why...

light bulbs going off now. I assume this is why vacuum tubes were created before silicone chips came into being.
Forum: RV Ongoing Maintenance Issues 05-05-2022, 08:10 AM
Replies: 23
Views: 1,949
Posted By lr172
Interesting. I had read that the pressurized...

Interesting. I had read that the pressurized mags were in place to increase the ambient pressures in the mag internals in order to improve sparking ability that was degraded in thinner air. I have...
Forum: VAF Classifieds (posts in here deleted after 30 days) 05-05-2022, 08:02 AM
Replies: 1
Views: 290
Posted By lr172
I do. Brand new in the box AOA Pro system. It...

I do. Brand new in the box AOA Pro system. It came with the 10 project I bought but never installed it. PM coming.

Larry
Forum: Traditional Aircraft Engines 05-05-2022, 07:41 AM
Replies: 21
Views: 1,591
Posted By lr172
Improper gearing (i.e. high output/low RPM with...

Improper gearing (i.e. high output/low RPM with short gears) is hard on the engine mechanical components and is also more detonation prone.

Hop on you bike and set up the gearing for a good...
Forum: Traditional Aircraft Engines 05-05-2022, 07:12 AM
Replies: 2
Views: 252
Posted By lr172
I wouldn't go any higher unless using grade 8 or...

I wouldn't go any higher unless using grade 8 or 9 bolts, and in that case looking at the specs for those bolts. That table is based upon milspec bolts (have no idea where these bolts sit in...
Forum: Traditional Aircraft Engines 05-05-2022, 06:58 AM
Replies: 12
Views: 913
Posted By lr172
Studs do not need the end inserted into the...

Studs do not need the end inserted into the threaded hole tight in order to hold properly. There is no requirement for this tight fit in order to obtain the rated strength of the stud. In...
Forum: Glass Cockpit 05-04-2022, 11:23 AM
Replies: 9
Views: 1,150
Posted By lr172
Thanks. Didn't realize that was possible.

Thanks. Didn't realize that was possible.
Forum: Safety 05-04-2022, 11:09 AM
Replies: 10
Views: 1,562
Posted By lr172
You generally can't get a tornado without lift,...

You generally can't get a tornado without lift, so the radar will look like T storms. However, there is nothing really unique on moisture level radar (nexrad) that will separate a t strorm echo from...
Forum: Painting your RV 05-04-2022, 10:58 AM
Replies: 2
Views: 401
Posted By lr172
I don't think any professional painter would...

I don't think any professional painter would accept prep work done by the owner, outside of the stuff mentioned above. No painter will warranty his work unless he does the prep. Painting is easy. ...
Forum: RV-10 05-04-2022, 10:46 AM
Replies: 21
Views: 1,749
Posted By lr172
I lean to 150 ROP during the climb and have no...

I lean to 150 ROP during the climb and have no issues keeping CHTs under 400 in the summer in my 10. Better to address the other issues before recommending extra fuel to solve the problem.

That...
Forum: RV Ongoing Maintenance Issues 05-04-2022, 07:44 AM
Replies: 23
Views: 1,949
Posted By lr172
The OPs post is a reason in itself to do them. ...

The OPs post is a reason in itself to do them. In flight mag checks will sometimes show problems that don't manifest in ground tests. Both the additional RPM and the altitude can intensify...
Forum: RV Ongoing Maintenance Issues 05-04-2022, 07:39 AM
Replies: 23
Views: 1,949
Posted By lr172
It could be. Sometimes when coils go bad, they...

It could be. Sometimes when coils go bad, they only show the failure once the composite shell expands from heat. The long copper wires are encapsulated in that shell. The fact that it is cycling...
Forum: Traditional Aircraft Engines 05-04-2022, 07:31 AM
Replies: 22
Views: 1,680
Posted By lr172
Could you elaborate on this for me? I have...

Could you elaborate on this for me? I have always been under the impression that the hotter the piston gets, the tighter/smaller the compression ring gap will become. Every tech sheet that I have...
Forum: Glass Cockpit 05-04-2022, 07:17 AM
Replies: 9
Views: 1,150
Posted By lr172
Can the G3xpert chime in here with a date range...

Can the G3xpert chime in here with a date range that applies to the manufacture date of the units included in this recall?

It would be nice if these are more modern units that we can avoid pulling...
Forum: Traditional Aircraft Engines 05-04-2022, 07:04 AM
Replies: 21
Views: 1,591
Posted By lr172
It is my belief that the old radial engines...

It is my belief that the old radial engines suffered problems when lugging or heavily loaded (think trying to accelerate in a car without downshifting) and this is where the over square stuff came...
Forum: Safety 05-03-2022, 07:07 AM
Replies: 10
Views: 1,562
Posted By lr172
We had one here in the Chicago area on Saturday. ...

We had one here in the Chicago area on Saturday. Radar is no help in identifying tornadic activity. That is all about shear and rotation aloft. There are tools that show this kind of data. ...
Forum: RV General Discussion/News 05-03-2022, 06:55 AM
Replies: 35
Views: 3,430
Posted By lr172
I disagree. Full rudder deflection during a slip...

I disagree. Full rudder deflection during a slip on final is 35* of deflection plus the crab angle into a 100 MPH wind. Not the same as a wind 90* to the tail surface, but surface winds are rarely...
Forum: Job Board 05-02-2022, 11:03 AM
Replies: 7
Views: 868
Posted By lr172
I designed and GC'ed our first home. I was able...

I designed and GC'ed our first home. I was able to find a structural engineer to review my drawings. Once I added all of his info into the blue prints, he signed it and put on his stamp. I suspect...
Forum: Electronic Ignition Systems 05-02-2022, 07:11 AM
Replies: 20
Views: 1,572
Posted By lr172
I don't know anything about surefly, but I...

I don't know anything about surefly, but I strongly agree that any electronic device required to make the engine work SHOULD NOT be run through the master. The master contactor is there to provide a...
Forum: Traditional Aircraft Engines 05-01-2022, 11:15 AM
Replies: 5
Views: 577
Posted By lr172
how lean? Unlike an FI servo, the mixture...

how lean? Unlike an FI servo, the mixture adjustment on a carb sets total fuel flow, not a percentage of fuel needed based upon air flow. Therefore, if running lean of peak, you must richen the...
Forum: RV-10 04-30-2022, 08:23 AM
Replies: 28
Views: 2,440
Posted By lr172
I cut two pieces of F/G material from the excess...

I cut two pieces of F/G material from the excess cut off the door panels to size and fitted them in place with epoxy flox and faired with bondo. Only took a couple of hours and looks like factory...
Forum: Traditional Aircraft Engines 04-30-2022, 08:02 AM
Replies: 6
Views: 371
Posted By lr172
I prefer the other type of skytech starter, I...

I prefer the other type of skytech starter, I think it is NL or something like that. More robust and with a shear pin to break instead of the casting. Also no solenoid to go bad. I have over 800...
Forum: Traditional Aircraft Engines 04-28-2022, 11:13 AM
Replies: 12
Views: 1,556
Posted By lr172
I would do a turbo for two reasons. First, I...

I would do a turbo for two reasons. First, I believe it is easier to dial in for a safe level. Remember, you are going to really struggle with knock sensors that actually sense knocks on these...
Forum: RV General Discussion/News 04-28-2022, 07:26 AM
Replies: 5
Views: 337
Posted By lr172
If I remember correctly for the Artex, 9600 baud...

If I remember correctly for the Artex, 9600 baud means it is expecting aviation format data and 2400 baud means it is expecting NMEA format data. Be sure your GPS is sending data in aviation...
Forum: Propellers 04-24-2022, 07:39 AM
Replies: 15
Views: 1,482
Posted By lr172
With an FP prop, you will want closer to 2600 or...

With an FP prop, you will want closer to 2600 or 2700 at 10K' if the pitch is optimized for a happy medium between cruise and climb. Try going to full throttle at 8K and see how much RPM you get. ...
Forum: Fiberglass 04-23-2022, 07:26 AM
Replies: 4
Views: 631
Posted By lr172
Just about every 2K primer, unless sprayed too...

Just about every 2K primer, unless sprayed too thin will protect the covered material from UV rays. The issues is that most primers do not have UV inhibitors, like the top coat materials have, and...
Forum: Tools 04-18-2022, 12:02 PM
Replies: 25
Views: 2,121
Posted By lr172
cheap and easy is boiled linseed oil. Natures...

cheap and easy is boiled linseed oil. Natures corrossion inhibitor. Shoiuld last longer than wax and more easily removed than paint.
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