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Search: Posts Made By: lr172
Forum: Fuel Injection Systems Today, 07:03 AM
Replies: 4
Views: 178
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 Today, 06:45 AM
Replies: 6
Views: 551
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) Yesterday, 11:38 AM
Replies: 7
Views: 967
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: 472
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: 556
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: 1,855
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: 2,191
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: 1,544
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: 472
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: 3,311
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: 2,043
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: 3,311
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: 207
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: 30,985
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: 30,985
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: 159,221
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: 501
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: 388
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: 842
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: 376
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: 378
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: 501
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: 1,688
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: 376
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: 1,263
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: 1,544
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: 376
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: 2,169
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: 4,596
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: 4,596
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: 3,311
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: 1,544
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: 3,651
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: 2,169
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: 1,326
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: 694
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: 694
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: 1,326
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: 1,326
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: 3,134
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: 2,613
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: 2,613
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: 2,613
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: 375
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: 3,134
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: 556
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: 556
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: 370
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: 438
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: 1,483
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: 858
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: 1,455
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: 1,455
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...
Forum: Safety 09-16-2022, 10:01 AM
Replies: 67
Views: 5,807
Posted By lr172
Ok. It takes about 1/2 an amp @12V to move the...

Ok. It takes about 1/2 an amp @12V to move the motor Show me a method for inducing 1/2 amp of current into a wire from one mile away. That is a seriously strong signal I am quite confident that...
Forum: RV-10 09-16-2022, 07:07 AM
Replies: 25
Views: 2,613
Posted By lr172
Similar to Bob's opinion, there are trade off's...

Similar to Bob's opinion, there are trade off's to be made. I would argue that you probably can't carry family and friends with A/C if that family/friends equaled 4 contemporary, adult sized people;...
Forum: RV-14 09-16-2022, 06:58 AM
Replies: 16
Views: 1,424
Posted By lr172
I speculate that part of the crazy run up in...

I speculate that part of the crazy run up in prices we have seen is due to increasing acceptance of experimental planes by the GA community, thereby increasing the demand side of the equation. If...
Forum: RV-10 09-16-2022, 06:44 AM
Replies: 6
Views: 858
Posted By lr172
+1 When you get corrosion spots like that, a...

+1

When you get corrosion spots like that, a thou more or less of metal turns to rust and later disappears, leaving a crater. Once this happens, the ring no longer rides on that surface and it will...
Forum: Traditional Aircraft Engines 09-16-2022, 06:40 AM
Replies: 9
Views: 1,280
Posted By lr172
DLC coating is just on the lifters, not the cam...

DLC coating is just on the lifters, not the cam lobes, and I don't think lyc is putting these lifters on new engines, though I don't know. Given how hard they are to find, I doubt it. I put them on...
Forum: Traditional Aircraft Engines 09-16-2022, 06:18 AM
Replies: 9
Views: 1,280
Posted By lr172
WHile a couple shell have spots that have the tin...

WHile a couple shell have spots that have the tin layer gone, and that points to wear. Whether or not they are problems cannot be done visually. You need a bore gauge to determine the clearance and...
Forum: GPS 09-13-2022, 10:49 AM
Replies: 20
Views: 1,119
Posted By lr172
The small electrical surge from the collapsing...

The small electrical surge from the collapsing field is generated on the activation side of the relay/solenoid, not the pass through side. The contacts are opening as the field collapses so it is...
Forum: Safety 09-13-2022, 07:17 AM
Replies: 67
Views: 5,807
Posted By lr172
While the symptoms certainly sound like some kind...

While the symptoms certainly sound like some kind of ground interference, I am struggling to see how that can happen via trim, as the trim system is dead simple. 12V through relays to a dc motor. ...
Forum: RV General Discussion/News 09-12-2022, 07:26 AM
Replies: 44
Views: 3,546
Posted By lr172
Have you ever examined the sealing mechanism in a...

Have you ever examined the sealing mechanism in a schrader valve? It is a very small cap with rubber and a very weak spring. If any dirt particles enter the stem, they will be forced into the small...
Forum: RV Ongoing Maintenance Issues 09-11-2022, 09:48 AM
Replies: 19
Views: 1,205
Posted By lr172
This is why I prefer pressure from the bottom vs...

This is why I prefer pressure from the bottom vs vacuum from the top. The former forces fluid past the threads, where the latter suck air in through the threads. I made a bottle with a cheap...
Forum: RV General Discussion/News 09-11-2022, 07:49 AM
Replies: 60
Views: 5,952
Posted By lr172
That is an incredibly tall order and seems highly...

That is an incredibly tall order and seems highly unlikely they could pull that off. Fed's likely to step in and put a halt to that. We have a limited number of refineries in this country that...
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