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Search: Posts Made By: lr172
Forum: Traditional Aircraft Engines Yesterday, 10:51 AM
Replies: 21
Views: 1,452
Posted By lr172
I disagree for several reasons. A compression...

I disagree for several reasons. A compression check will not always identify why an engine is consuming oil, though it does help to identify some causes of why it is blowing oil out of the breather....
Forum: RV Ongoing Maintenance Issues Yesterday, 10:36 AM
Replies: 9
Views: 391
Posted By lr172
While that is a good idea, they don't leak due to...

While that is a good idea, they don't leak due to insufficient torque. They are interference fit bolts and excessive case movement causes wear between the stud and case hole. Once you get a thou or...
Forum: Traditional Aircraft Engines Yesterday, 10:29 AM
Replies: 21
Views: 1,452
Posted By lr172
A significant change in consumption like that is...

A significant change in consumption like that is NOT from normal wear. Something inside one or several cylinders has changed. First guess in a broken ring. Changes like that deserve further...
Forum: Fiberglass Yesterday, 07:45 AM
Replies: 9
Views: 511
Posted By lr172
Depends upon the cutting compound used and the...

Depends upon the cutting compound used and the hardness of the coating. I use the 3M stuff and it says that it takes out 1200 grit scratches, though experience tells me it really only takes out 1500...
Forum: RV Ongoing Maintenance Issues Yesterday, 07:35 AM
Replies: 9
Views: 391
Posted By lr172
The base O ring is a pretty uncommon place for...

The base O ring is a pretty uncommon place for oil leaks. When mine appeared to leak from that area, it was actually the push rod tube seals that were the source, just hard to see the oil on the top...
Forum: Traditional Aircraft Engines Yesterday, 07:29 AM
Replies: 21
Views: 1,452
Posted By lr172
I would say that an absolute minimum is that you...

I would say that an absolute minimum is that you can go from topped off to minimum oil qty over the span of time = full fuel endurance. Most would say that long before that point you are due for a...
Forum: RV General Discussion/News Yesterday, 07:22 AM
Replies: 13
Views: 584
Posted By lr172
Same here and don't regret the decision. Larry

Same here and don't regret the decision.

Larry
Forum: Traditional Aircraft Engines 10-02-2022, 08:26 AM
Replies: 4
Views: 292
Posted By lr172
I wish you luck in this endeavor, but fear...

I wish you luck in this endeavor, but fear several variables will still be unknown. Kind of like those medical studies that observe eating behavior and heart attacks and then deduce that certain...
Forum: Traditional Aircraft Engines 10-02-2022, 08:07 AM
Replies: 8
Views: 556
Posted By lr172
I don't see that happening. The fuel is coming...

I don't see that happening. The fuel is coming out of the restrictor at a minimum of 2 PSI and therefore at a decent velocity. I don't know the physics calculations, but it would seem like a pretty...
Forum: RV Ongoing Maintenance Issues 10-01-2022, 11:23 AM
Replies: 9
Views: 842
Posted By lr172
Clear Coat gives off solvents for several months....

Clear Coat gives off solvents for several months. Most painters recommend 6 months before applying wax. Absolute minimum is 3 months.
Forum: RV Ongoing Maintenance Issues 10-01-2022, 11:09 AM
Replies: 13
Views: 802
Posted By lr172
They put solvents in the oil to help it absorb...

They put solvents in the oil to help it absorb into the cotton. These later evaporate and the oil is then thicker. Guessing the EU has more stringent VOC limits than the US.
Forum: Fuel Injection Systems 09-30-2022, 07:03 AM
Replies: 4
Views: 259
Posted By lr172
The kavlico is a a tansducer NOT a resistive...

The kavlico is a a tansducer NOT a resistive sensor, as most three wire sensors are. It has a microchip and gets 12V + GRD to power it and the chip sends varying voltages on an output lead to...
Forum: RV Ongoing Maintenance Issues 09-30-2022, 06:45 AM
Replies: 9
Views: 842
Posted By lr172
Primer is not really required for a touch up...

Primer is not really required for a touch up repair over fiberglass. It has benefits, but not required. Many repairs of this size are done without primer and the base sticks just fine. Yellow can...
Forum: VAF Classifieds (posts in here deleted after 30 days) 09-29-2022, 11:38 AM
Replies: 7
Views: 1,100
Posted By lr172
Same here. Did a complete overhaul with new...

Same here. Did a complete overhaul with new cylinders and had a like new engine with new service limits for well less than half the Lyc new price at the time. Most run screaming from a prop strike...
Forum: Traditional Aircraft Engines 09-28-2022, 07:26 AM
Replies: 8
Views: 559
Posted By lr172
lester 14158 It is an ND alternator that is set...

lester 14158

It is an ND alternator that is set up for CCW rotation (80's Honda Civic), so the fan is spinning in the correct direction and providing good air flow. It is rated at 50 amps and is...
Forum: Electrical Systems 09-28-2022, 07:01 AM
Replies: 8
Views: 588
Posted By lr172
Your description kind of explains everything. A...

Your description kind of explains everything. A bad cell in a battery will consume very large amounts of energy from the alternator, often trashing them in the process as you saw (they won't run...
Forum: Electrical Systems 09-28-2022, 06:23 AM
Replies: 16
Views: 1,915
Posted By lr172
I dial down the force on the impact for...

I dial down the force on the impact for installing a pulley nut. However, it is not overly critical. The key is to grip the pulley tightly with your other hand. This allows slippage of the pulley...
Forum: RV-9/9A 09-27-2022, 10:47 AM
Replies: 36
Views: 2,437
Posted By lr172
There is no loosey goosey. To my knowledge, the...

There is no loosey goosey. To my knowledge, the only one who has done true engineering analysis and destructive testing is Vans and they are crystal clear on what the limit is with no exceptions. ...
Forum: RV Ongoing Maintenance Issues 09-27-2022, 07:29 AM
Replies: 20
Views: 1,655
Posted By lr172
one wrench on the flat area of the clevice and...

one wrench on the flat area of the clevice and the other on the jam nut.
Forum: Traditional Aircraft Engines 09-27-2022, 06:55 AM
Replies: 8
Views: 559
Posted By lr172
Can expect a lot more if you shop wisely. Nippon...

Can expect a lot more if you shop wisely.

Nippon Denso is probably the world's largest supplier of Alternators and there is a reason that most every Asian car maker uses them. They don't last...
Forum: Propellers 09-26-2022, 07:50 AM
Replies: 45
Views: 3,572
Posted By lr172
I did and we clearly see different things. I see...

I did and we clearly see different things. I see that the pin was 50% sheared off and bent during the clockwise tightening operation. (Sheared portion is on the left side. The right side has a...
Forum: Safety 09-26-2022, 07:27 AM
Replies: 20
Views: 2,234
Posted By lr172
Based upon the FP data, assume you have FI. Fuel...

Based upon the FP data, assume you have FI. Fuel flow is based upon airflow through the servo, so having 1 stuck Exh valve should have reduced fuel flow. It is possible that you were too rich and...
Forum: Propellers 09-25-2022, 01:13 PM
Replies: 45
Views: 3,572
Posted By lr172
You can see where it sheared almost half the pin...

You can see where it sheared almost half the pin away during tightening, ironically right at the split. Given that doesn't happen to most, I speculate ti could be due to over torquing or possible a...
Forum: Glass Cockpit 09-25-2022, 07:52 AM
Replies: 2
Views: 238
Posted By lr172
I know little about the Pmag, but I suspect there...

I know little about the Pmag, but I suspect there is a VR or hall sensor to pick up an RPM. I have heard many mention that bearing failures are common on the Pmag. If the bearing goes bad, it can...
Forum: RV General Discussion/News 09-25-2022, 07:42 AM
Replies: 144
Views: 31,281
Posted By lr172
As mentioned, they now run 40+ PSI all the way...

As mentioned, they now run 40+ PSI all the way from the tank to the injector and that fully solves the vapor lock issue with all versions of modern auto gas. 20-30 years ago, when the pumps were...
Forum: RV General Discussion/News 09-25-2022, 07:35 AM
Replies: 144
Views: 31,281
Posted By lr172
Modern EFII still uses elaborate fuel delivery...

Modern EFII still uses elaborate fuel delivery and ignition tables, based upon RPM, MAP, MAF, IAT, TP, etc. These are developed during countless hours on the Dyno. The Knock sensors are only relied...
Forum: RV Building Tips/Techniques 09-25-2022, 07:10 AM
Replies: 196
Views: 159,430
Posted By lr172
I also learned that painful lesson the hard way. ...

I also learned that painful lesson the hard way. Within an hour or two it wipes right off with water. A day later, it is like an adhesive. Just don't understand how that happens. I have had good...
Forum: Primers 09-24-2022, 11:38 AM
Replies: 8
Views: 545
Posted By lr172
While much safer to use, I would expect that...

While much safer to use, I would expect that adhesion may not be as strong as more typical primers that will cross link (i.e. chemically bond) with the top coat. You would be limited to just...
Forum: RV-10 09-24-2022, 08:05 AM
Replies: 3
Views: 423
Posted By lr172
Use the #40 countersink bit that you use for -3...

Use the #40 countersink bit that you use for -3 rivets. Best to drill first with #40 bit, CS then drill 36 and tap. It will still work if you already drilled it, but still best to do the...
Forum: Painting your RV 09-24-2022, 07:51 AM
Replies: 11
Views: 963
Posted By lr172
I disagree. When I paint something like a plane,...

I disagree. When I paint something like a plane, I would estimate that 95% of the time involved is pre-spray or post-spray work and 5% is actually spraying of the paint itself. SS is one spray...
Forum: Traditional Aircraft Engines 09-24-2022, 07:45 AM
Replies: 8
Views: 415
Posted By lr172
Sorry, missed that in your post.

Sorry, missed that in your post.
Forum: RV-7/7A 09-24-2022, 07:37 AM
Replies: 9
Views: 414
Posted By lr172
Need to read the installation manual. Most list...

Need to read the installation manual. Most list a maximum distance offset from the aircraft's longitudinal center line and it is usually only a couple feet.
Forum: Primers 09-24-2022, 07:03 AM
Replies: 8
Views: 545
Posted By lr172
FYI, 2K means two part or Catalyzed. It is a...

FYI, 2K means two part or Catalyzed. It is a generic term in the paint industry.

Unfamiliar with a product like that mentioned. Most quality PU paints and primers use Isocyanates as the catalyst...
Forum: Glass Cockpit 09-23-2022, 11:39 AM
Replies: 15
Views: 1,722
Posted By lr172
On the 10, I placed the OAT on an angle bracket...

On the 10, I placed the OAT on an angle bracket that is bolted to the aft Hor Stab spar attach. Complete shade and the negative pressure of the fuselage is constantly pulling air into the fuse from...
Forum: Traditional Aircraft Engines 09-23-2022, 11:02 AM
Replies: 8
Views: 415
Posted By lr172
While not an expert in pump design theory or...

While not an expert in pump design theory or diagnostics, based upon my understanding of the mechanical principles involved with these pumps, I really struggle to see how any mechanical issue in the...
Forum: RV-14 09-23-2022, 10:50 AM
Replies: 13
Views: 1,324
Posted By lr172
+1 When I did my IFR training, the pitch...

+1

When I did my IFR training, the pitch sensitivity of the 6 was a bit problematic for holding 100" altitude on the gauges as a novice. It took some time to make the elevator skins perfectly flat,...
Forum: RV Ongoing Maintenance Issues 09-23-2022, 08:45 AM
Replies: 20
Views: 1,655
Posted By lr172
The Garmin servo does NOT provide trim control...

The Garmin servo does NOT provide trim control directly. It can only send electricity to a dedicated trim servo motor to achieve trim changes. I would follow that cable all the way to the trim...
Forum: Traditional Aircraft Engines 09-23-2022, 07:14 AM
Replies: 8
Views: 415
Posted By lr172
There is a diaphragm with to check valves, inlet...

There is a diaphragm with to check valves, inlet and outlet. When the diaphragm relaxes, the outlet closes and the inlet opens. As it compresses, the inlet closes and the outlet opens. The pumps...
Forum: RV General Discussion/News 09-22-2022, 12:47 PM
Replies: 19
Views: 2,256
Posted By lr172
+1 My son was required to do a full, power off...

+1

My son was required to do a full, power off stall with proper recovery for his PPL a year ago. They wanted him to go past the break and to see the nose fall to assess his recovery skill. ...
Forum: Electrical Systems 09-22-2022, 11:16 AM
Replies: 30
Views: 4,628
Posted By lr172
Go look at the price for a 28V alternator and...

Go look at the price for a 28V alternator and compare that to the $50 many of us pay for an automotive 12V version. Then tell us if it is still better on paper. Then go find trim motors, flap...
Forum: Electrical Systems 09-22-2022, 11:11 AM
Replies: 30
Views: 4,628
Posted By lr172
I got a great deal on an old King 24V comm radio....

I got a great deal on an old King 24V comm radio. I made an inexpensive buck converter array to up the 12->24 volts. I needed two units to handle the current and instead wired four of them in...
Forum: Propellers 09-22-2022, 10:38 AM
Replies: 45
Views: 3,572
Posted By lr172
Look closely at Pic #4. I can see what appears...

Look closely at Pic #4. I can see what appears to be a kink/bend in the pin's wall right where the nut and stud meet. IMHO, those pins should have been installed with the split oriented...
Forum: RV Ongoing Maintenance Issues 09-22-2022, 07:55 AM
Replies: 20
Views: 1,655
Posted By lr172
Jam nut should be tight, but if it gets loose,...

Jam nut should be tight, but if it gets loose, the clevice cannot spin and it seems improbable that the cable could rotate any meaningfull amount with the relatively tight radius bend that it has at...
Forum: Primers 09-22-2022, 07:42 AM
Replies: 23
Views: 3,893
Posted By lr172
+1 That looks exactly like the corrosion that...

+1

That looks exactly like the corrosion that appears regardless of salt when the plastic covering is left on. You can even see the outline of exactly where the plastic lifted off the metal due to...
Forum: RV General Discussion/News 09-22-2022, 07:30 AM
Replies: 19
Views: 2,256
Posted By lr172
Wink My son completed his PPL training a year ago in...

My son completed his PPL training a year ago in our 6A. He has never even sat in a classic trainer. While the insurance is steep, I would argue that it is a good bit less expensive to train in your...
Forum: Electrical Systems 09-21-2022, 09:59 AM
Replies: 17
Views: 1,386
Posted By lr172
Clearly we are interpreting the manuals...

Clearly we are interpreting the manuals differently. THe quotation above refrers to reserve capactiy, which is what the battery will deliver over a 20 hour period and the test proves that 80% of THE...
Forum: Fuel Injection Systems 09-21-2022, 07:46 AM
Replies: 10
Views: 735
Posted By lr172
I edited my post to say "on the bendix and have...

I edited my post to say "on the bendix and have no knowledge of the AFP" apparently after you quoted this. Apparently the AFP provides field replaceable jets for adjusting WOT mixture so my...
Forum: Fuel Injection Systems 09-21-2022, 07:25 AM
Replies: 10
Views: 735
Posted By lr172
There is no external adjustment for fuel flow at...

There is no external adjustment for fuel flow at WOT at least on the bendix style and assume the AFP is the same, but not sure. Various things can be tweaked inside the unit to set fuel flow to any...
Forum: Electrical Systems 09-20-2022, 12:36 PM
Replies: 17
Views: 1,386
Posted By lr172
Sorry, but no one selling to the retail sector,...

Sorry, but no one selling to the retail sector, excluding Earth X, markets their batteries that way. They list an Ah rating at a specific discharge rate and that rate is almost NEVER the Ah rating. ...
Forum: Electrical Systems 09-20-2022, 12:34 PM
Replies: 17
Views: 1,386
Posted By lr172
Standby, I am sure Ron will com along and call...

Standby, I am sure Ron will com along and call you crazy as he did with me. The above is for lead acid. Most Lithium providers, Earth x excluded, list their Ah ratings as PB equivalent and will be...
Forum: RV Building Tips/Techniques 09-20-2022, 06:52 AM
Replies: 31
Views: 3,207
Posted By lr172
When spraying paint, most experienced folks will...

When spraying paint, most experienced folks will tell you to ALWAYS run MAX pressure through the hose and regulate at the gun. This is especially true with HVLP that needs a lot of flow. Reducing...
Forum: RV-10 09-20-2022, 06:35 AM
Replies: 25
Views: 2,683
Posted By lr172
Lets try to keep our assistance to realistic data...

Lets try to keep our assistance to realistic data here. I put in an aerosport O/H console. It is carbon fiber and can't weigh more than 3 lbs. AC system data that I have seen put the weight in the...
Forum: RV-10 09-20-2022, 06:31 AM
Replies: 25
Views: 2,683
Posted By lr172
You will find that most lithium battery sellers...

You will find that most lithium battery sellers use PB equivalent ratings. That means that a 100 Ah battery can deliver 100 amps for about 5-10 minutes. Even Lead Acid batteries set the Ah rating...
Forum: RV-10 09-19-2022, 10:39 AM
Replies: 25
Views: 2,683
Posted By lr172
Not practical. An electric A/C system that can...

Not practical.

An electric A/C system that can produce the 8K BTU minimum to be worthwhile is going to require at least a 120A alternator and even with that, you will be draining the batteries...
Forum: VAF Classifieds (posts in here deleted after 30 days) 09-19-2022, 10:24 AM
Replies: 2
Views: 386
Posted By lr172
WTB: Transponder

I have a buddy with a Warrior whose transponder just died and looking to help him out. KT series or 327 would be best for ease of installation.

Larry
Forum: RV Building Tips/Techniques 09-19-2022, 07:40 AM
Replies: 31
Views: 3,207
Posted By lr172
+1 It is a bit of an art, but mastering trigger...

+1

It is a bit of an art, but mastering trigger control is a better all around solution, as the builder can adjust for every situation without having to worry about going back to the regulator. It...
Forum: Electrical Systems 09-19-2022, 07:17 AM
Replies: 8
Views: 588
Posted By lr172
Generally, resistance on the voltage sense...

Generally, resistance on the voltage sense circuit results in higher than normal Alt output voltage, not lower. The resistance lowers the voltage that the regulator sees on it's sense input and in...
Forum: Electrical Systems 09-19-2022, 07:14 AM
Replies: 8
Views: 588
Posted By lr172
No. The battery is floating above 13 volts and...

No. The battery is floating above 13 volts and not adding energy. It is a sign of the ALTERNATOR not meeting electrical demand OR not properly managing th voltage level.

Larry
Forum: RV Building Tips/Techniques 09-19-2022, 07:11 AM
Replies: 5
Views: 388
Posted By lr172
Floatation foam is designed to sit in boat hulls...

Floatation foam is designed to sit in boat hulls and many application have almost constant water contact. It seems unlikely that it is not designed to handle this environment.

Larry
Forum: Traditional Aircraft Engines 09-19-2022, 06:53 AM
Replies: 6
Views: 464
Posted By lr172
Warm engines spin easier (i.e. requiring less...

Warm engines spin easier (i.e. requiring less amperage) than cold ones, so that possibly explains the variances you see. Likely issue is not enough current getting to the starter. Problems with...
Forum: Safety 09-18-2022, 10:12 AM
Replies: 11
Views: 1,518
Posted By lr172
I have no idea, but I do know that MANY...

I have no idea, but I do know that MANY industries are seeing employee shortages since the covid fiasco. I am sure some of that is unusually large quantities of early retirements we saw post-covid,...
Forum: RV-10 09-18-2022, 06:49 AM
Replies: 6
Views: 872
Posted By lr172
The transluscent tan/brown stuff in pic 3 is...

The transluscent tan/brown stuff in pic 3 is glazing. There is a only a small amount of it, so no surprise that oil consumption is in the normal category. However, some see 20 hrs/qt and this type...
Forum: Traditional Aircraft Engines 09-17-2022, 07:34 AM
Replies: 10
Views: 1,488
Posted By lr172
Very good advice, but I would argue that the...

Very good advice, but I would argue that the overlap promotes flow from intake to exhaust during the overlap period. The Exh tends to have a lower pressure due to the velocity than the intake and...
Forum: Traditional Aircraft Engines 09-17-2022, 07:22 AM
Replies: 10
Views: 1,488
Posted By lr172
While it is a heat signature, it is not...

While it is a heat signature, it is not necessarily burning, as when this pattern is seen on the exh valve. Intake valves tend to get different deposits that can only form on that valve because it...
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