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Search: Posts Made By: lr172
Forum: RV-10 Today, 12:02 PM
Replies: 10
Views: 307
Posted By lr172
Not really relevant. Ever seen a fighter or...

Not really relevant. Ever seen a fighter or airliner with a piston engine and constant speed prop? Assuming you mean more modern stuff from the last 60 years, of course.
Forum: RV-8/8A Today, 11:56 AM
Replies: 11
Views: 348
Posted By lr172
Not sure this is universal. The cables on my 6...

Not sure this is universal. The cables on my 6 have 800+ hours and perform as well as new. I needed to clean up the plastic friction lock piece on the throttle, but otherwise good as new.

Larry
Forum: RV-10 Today, 10:01 AM
Replies: 10
Views: 307
Posted By lr172
I have flown a bit with quadrants, but much...

I have flown a bit with quadrants, but much prefer the push pull. I am always tinkering with mixture to achieve efficiency and suspect that it is much easier to make precise adjustments with a...
Forum: Safety Today, 09:29 AM
Replies: 25
Views: 2,918
Posted By lr172
I have done a fair amount of research on this...

I have done a fair amount of research on this subject and the general wisdom in the welding community is that when TIG or gas welding of 4130 at thicknesses less than 1/8", normalizing is not...
Forum: Traditional Aircraft Engines Today, 08:57 AM
Replies: 9
Views: 304
Posted By lr172
From your description, the ambient temps seem...

From your description, the ambient temps seem coincidental. Likely the reduced oil pressure is coming from some other source/problems. Pressure relief is a good place to start and verifying the...
Forum: VAF Classifieds (posts in here deleted after 30 days) Today, 08:12 AM
Replies: 3
Views: 215
Posted By lr172
You can make one. The connector is available...

You can make one. The connector is available from Digikey for a couple of bucks. I bought one on this site and the connector was corroded. Not too difficult to make. There is a post here that...
Forum: RV Building Tips/Techniques Today, 08:07 AM
Replies: 27
Views: 2,127
Posted By lr172
Section 5 has descriptions and pictures. It will...

Section 5 has descriptions and pictures. It will guide you through the process. My 6 was somewhat sensitive in pitch but not a problem. When I started IFR training, It was hard to hold 100' when...
Forum: RV-6/6A Yesterday, 09:41 AM
Replies: 8
Views: 373
Posted By lr172
You may not have noticed yet, but the plane...

You may not have noticed yet, but the plane should have three different hinge half's for mounting the seat back. You may want to pull the cushions and experiment with these. You can also take them...
Forum: Traditional Aircraft Engines Yesterday, 09:28 AM
Replies: 6
Views: 360
Posted By lr172
certainly. But I struggle to see how the same...

certainly. But I struggle to see how the same carb is used on both a 360 and a 540. That's a pretty big spread in displacement and suspect the variability across sub-models must be...
Forum: RV-6/6A Yesterday, 09:21 AM
Replies: 8
Views: 373
Posted By lr172
Pretty sure the seat position is the same. The 7...

Pretty sure the seat position is the same. The 7 used different, shorter ribs under the seat that lower the seat pan relative to the 6. Without cutting and grafting, the only option would be to rip...
Forum: RV General Discussion/News Yesterday, 08:48 AM
Replies: 14
Views: 1,212
Posted By lr172
Some rings (Superior, for example) do not come...

Some rings (Superior, for example) do not come sized to fit. They are manufactred to at least the largest possible diameter and must be filled to a specific end gap at a specific place in the cyl...
Forum: RV General Discussion/News Yesterday, 08:30 AM
Replies: 62
Views: 4,151
Posted By lr172
I worry most about differential expansion rates...

I worry most about differential expansion rates of piston and cylinder and the scuffing it can cause, so I set a min CHT of 250F for T/O. If the engine was warm to begin with, I wouldn't worry. I...
Forum: RV-8/8A Yesterday, 08:02 AM
Replies: 11
Views: 469
Posted By lr172
I would try some troubleshooting first. I just...

I would try some troubleshooting first. I just had my 39 fail. Garmin clipped me $400 for a refurb, as mine was out of warranty.

Larry
Forum: RV General Discussion/News Yesterday, 07:46 AM
Replies: 14
Views: 1,212
Posted By lr172
I had a broken compression ring in my 540. ...

I had a broken compression ring in my 540. Completely unnoticeable and only found with a compression test. No detectable performance increase after replacement. Blowby was a bit higher than...
Forum: Traditional Aircraft Engines 11-27-2021, 09:18 AM
Replies: 6
Views: 360
Posted By lr172
Thanks. I only have a 320 and a 540 and assumed...

Thanks. I only have a 320 and a 540 and assumed the 320/360 were the same.
Forum: RV-6/6A 11-27-2021, 09:12 AM
Replies: 5
Views: 388
Posted By lr172
Just pull the pedals out and take them to a local...

Just pull the pedals out and take them to a local welder. Let him know it is 4130 steel and show him a picture of the gusset from the SB. You could buy the 4130 from Mcmaster and make the gusset...
Forum: Traditional Aircraft Engines 11-27-2021, 08:54 AM
Replies: 6
Views: 360
Posted By lr172
Lot of hot rodders use large carbs to deal with...

Lot of hot rodders use large carbs to deal with issues like turbos and other enhancements that increase the intake CFM. From my experience, a carb that flows a lot more then the typical displacement...
Forum: Traditional Aircraft Engines 11-27-2021, 08:38 AM
Replies: 26
Views: 2,152
Posted By lr172
From my read of your data, FP is pretty normal...

From my read of your data, FP is pretty normal all the way until you drop from idle to shut off. As mentioned, the raw fuel in the air box can be from factors other then the one that caused the un...
Forum: RV-9/9A 11-27-2021, 08:21 AM
Replies: 47
Views: 2,864
Posted By lr172
I learned by slipping down final. However, my 6A...

I learned by slipping down final. However, my 6A transition CFI recommended trying the crab approach. I settled on a hybrid. I crab down final and put in a slip as I come over the numbers. I find...
Forum: RV General Discussion/News 11-26-2021, 11:50 AM
Replies: 62
Views: 4,151
Posted By lr172
I don't agree with that. Watching EGT's is...

I don't agree with that. Watching EGT's is important for monitoring engine health. for example, the quickest way to identify a mag or EI failure is to observe a 100-150* rise in EGT. How would you...
Forum: Electrical Systems 11-26-2021, 09:45 AM
Replies: 11
Views: 653
Posted By lr172
If wired according to the above diagram, the...

If wired according to the above diagram, the switch will only allow the left mag to fire with the key in the S position. It is critical that you use the specific grd posts shown.
Forum: RV-6/6A 11-26-2021, 09:34 AM
Replies: 5
Views: 388
Posted By lr172
FYI, the lines that go between the co pilot and...

FYI, the lines that go between the co pilot and pilot brakes are HIGH pressure, not LOW (at least when the co pilot is braking). Be sure to use the stronger parker lines and not nylon for...
Forum: Electrical Systems 11-25-2021, 08:22 AM
Replies: 4
Views: 723
Posted By lr172
The P lead post is actually the end of a...

The P lead post is actually the end of a capicator and it is wired in parallel with the coil's primary winding output on one side of the points (the other side is ground). That post should show 0...
Forum: RV General Discussion/News 11-24-2021, 08:16 AM
Replies: 62
Views: 4,151
Posted By lr172
I believe there are many variables that impact...

I believe there are many variables that impact build up on the exhaust valves. In fact, there is still argument about what the build up is (I still believe it is carbon from oxidized oil, others...
Forum: RV General Discussion/News 11-24-2021, 08:01 AM
Replies: 13
Views: 1,213
Posted By lr172
It definitely appeared as a wave, as you can see,...

It definitely appeared as a wave, as you can see, via the cloud tops, the intensity diminish and amplitude lengthen over a distance; Mountain wave does the same, but normally can't be seen, just...
Forum: RV General Discussion/News 11-23-2021, 10:14 AM
Replies: 13
Views: 1,213
Posted By lr172
I am guessing you were east of a 4-5000'...

I am guessing you were east of a 4-5000' mountain? Could be as much as 100's of miles east. Pretty sure they are simple cumulus, but the upper shape is created by mountain wave. When seen near the...
Forum: RV-9/9A 11-23-2021, 09:54 AM
Replies: 47
Views: 2,864
Posted By lr172
Still not sure I agree. I believe that a spin...

Still not sure I agree. I believe that a spin requires yawing at the stall. In a skid, there is definitely yaw in the direction of turn/bank. In a slip, there is no yaw unless you over do the...
Forum: RV Ongoing Maintenance Issues 11-23-2021, 09:15 AM
Replies: 4
Views: 313
Posted By lr172
I have experienced drooping in the area of 3/16,...

I have experienced drooping in the area of 3/16, maybe 1/4" over time and use. The amount of droop seems to vary a bit, but I would never expect an engine to droop 3/4". The fact that new mounts...
Forum: RV-9/9A 11-23-2021, 08:31 AM
Replies: 47
Views: 2,864
Posted By lr172
I thought that a skid was pro spin and will...

I thought that a skid was pro spin and will immediately spin at the stall (bank and yaw moment in the same direction). I also thought that a slip was anti spin and at the stall will have a yaw...
Forum: RV-7/7A 11-23-2021, 08:03 AM
Replies: 10
Views: 645
Posted By lr172
Cross overs are like headers on a performance...

Cross overs are like headers on a performance car. They can increase flow during the In/Ex overlap and help pull more air fuel into the chamber, displacing more exhaust, thus creating more power. ...
Forum: Glass Cockpit 11-22-2021, 12:34 PM
Replies: 15
Views: 660
Posted By lr172
I did this for my door open light. The door...

I did this for my door open light. The door sensor switch closes to ground. That ground went to both a relay coil (12V fed to the other side) to illuminate the LED lamp and the discrete input for...
Forum: Fiberglass 11-22-2021, 09:44 AM
Replies: 8
Views: 483
Posted By lr172
I bought a coloring kit designed for gel coat...

I bought a coloring kit designed for gel coat from a marine supplier.
Forum: Flight Testing 11-22-2021, 08:08 AM
Replies: 30
Views: 3,285
Posted By lr172
Peoples lungs are different and absorb O2 at...

Peoples lungs are different and absorb O2 at different rates. I would expect 2 people to begin Symptoms at different times. There is a 50% chance that the pilot succumbs first and therefore the...
Forum: RV General Discussion/News 11-22-2021, 07:59 AM
Replies: 27
Views: 2,327
Posted By lr172
Some impressive work here. Thanks for sharing...

Some impressive work here. Thanks for sharing the details.

Larry
Forum: RV General Discussion/News 11-21-2021, 12:42 PM
Replies: 62
Views: 4,151
Posted By lr172
I have 800 hours on my 320 in the 6. I fly a lot...

I have 800 hours on my 320 in the 6. I fly a lot in the winter with CHTs from 275-325. Checked the exh valves a few hours ago and zero lead deposits on the valves. Need to be cautious with some of...
Forum: Electrical Systems 11-21-2021, 08:55 AM
Replies: 7
Views: 558
Posted By lr172
can't really help on the bulk of your issues. ...

can't really help on the bulk of your issues. You will need to trace the full wiring to see what was done and why it is not working. On the above, yes, this is likely how you are getting hi and low...
Forum: RV General Discussion/News 11-21-2021, 08:29 AM
Replies: 62
Views: 4,151
Posted By lr172
Lyc recommends OT no lower than 160. Not sure...

Lyc recommends OT no lower than 160. Not sure how big of a deal it is to run at 140 or 150. I suspect that the only issue, assuming a 20w50 oil is used, is that moisture removal from the oil is...
Forum: RV General Discussion/News 11-21-2021, 08:16 AM
Replies: 3
Views: 489
Posted By lr172
Do some searching here, as many have posted their...

Do some searching here, as many have posted their test results. Seems most find the sink rate for the 4,6,7,8 is between 8.5 and 10:1 at best glide speed, which also seems to vary a bit across...
Forum: RV General Discussion/News 11-21-2021, 08:08 AM
Replies: 23
Views: 1,156
Posted By lr172
You'll need to back that up with something. ...

You'll need to back that up with something. There are millions of cars, planes and industrial equipment that sits out side in the frigid northern part of our continent and have heard NOTHING about...
Forum: RV General Discussion/News 11-21-2021, 07:59 AM
Replies: 23
Views: 1,156
Posted By lr172
Don't listen to comments like that. They are...

Don't listen to comments like that. They are based upon opinions, not science or facts. I know guys that also find it abusive to not wash the planes belly after each flight. My plane sits on the...
Forum: RV General Discussion/News 11-21-2021, 07:55 AM
Replies: 23
Views: 1,156
Posted By lr172
Not so good with metric, but I think that is...

Not so good with metric, but I think that is around 0 to -5 F. I have flown several times in weather like that and no issue with the canopy. The RV-6 heater is another matter though. Need a heavy...
Forum: Electrical Systems 11-20-2021, 09:58 AM
Replies: 7
Views: 382
Posted By lr172
The VR only passes field current, not output...

The VR only passes field current, not output current. Most use a 5A CB for this field current, so 20 gauge would be more appropriate for VR grounding than 10 Ga.

Larry
Forum: Flight Testing 11-20-2021, 09:07 AM
Replies: 30
Views: 3,285
Posted By lr172
Interesting, I would have expected a lower fuel...

Interesting, I would have expected a lower fuel flow. I haven't yet been above 15K in my 10 (limited to 18K due to basic med). At 14 or 15K, I have been getting 165 KTAS at around 9.4 GPH. I would...
Forum: Electrical Systems 11-19-2021, 12:10 PM
Replies: 7
Views: 382
Posted By lr172
Most istallations consolidate all of the grounds...

Most istallations consolidate all of the grounds on the firewall. If the VR is mounted to the firewall, I see no need for a separate gound wire My planes don't have one for the VR and have never...
Forum: RV Ongoing Maintenance Issues 11-19-2021, 11:51 AM
Replies: 4
Views: 360
Posted By lr172
Be cautious here, as a LOT of body shops have...

Be cautious here, as a LOT of body shops have little to no fiberglass experience (very few fiberglass autos out there). Stress or spider cracking needs F/G reinforcement work. An unskilled body...
Forum: Traditional Aircraft Engines 11-19-2021, 11:36 AM
Replies: 13
Views: 897
Posted By lr172
a hot start 10 seconds after shut down is VERY...

a hot start 10 seconds after shut down is VERY different than a hot start 5-10 minutes after shut down and 30 minutes after is different still. Hot start is all about understanding how much fuel...
Forum: RV General Discussion/News 11-19-2021, 09:03 AM
Replies: 8
Views: 461
Posted By lr172
1/3 of travel, not necessarily .4". And that is...

1/3 of travel, not necessarily .4". And that is 1/3 of travel from the nose down side of the servo travel range. Remember that trim travel direction is opposite of elevator direction.
Forum: RV-10 11-19-2021, 08:16 AM
Replies: 11
Views: 1,016
Posted By lr172
I didn't really change anything, design wise,...

I didn't really change anything, design wise, from the plans. The plans have you make two internal stops on either side of the hinge bracket. I just made a one piece version of the same design. ...
Forum: Traditional Aircraft Engines 11-19-2021, 08:04 AM
Replies: 13
Views: 969
Posted By lr172
I, of course, yield to your significant...

I, of course, yield to your significant experience, but I must say that I am very surprised to find that heat could travel down the pushrod. LOT of air flowing over the pushrod tube. Further...
Forum: RV-10 11-18-2021, 09:38 AM
Replies: 6
Views: 405
Posted By lr172
I have only installed the dressers on my 10. Be...

I have only installed the dressers on my 10. Be careful of the opinions you get here, as dresser sells several retread versions. THe Monster is a larger tire, but not available in 15-6X6. They...
Forum: RV-10 11-18-2021, 09:28 AM
Replies: 11
Views: 1,016
Posted By lr172
I believe this is a somewhat common failure, as...

I believe this is a somewhat common failure, as the design is not strong enough for wind related slamming of the rudder, only to stop pilot induced pedal pressure and it is plenty strong for that. I...
Forum: Glass Cockpit 11-18-2021, 09:09 AM
Replies: 6
Views: 357
Posted By lr172
They are signal grounds for RS data lines. It is...

They are signal grounds for RS data lines. It is pefectly acceptable to use the shield for this ground, but it is not the same as a grd drain on an otherwise unused shield. THey should go to the...
Forum: Traditional Aircraft Engines 11-18-2021, 09:01 AM
Replies: 13
Views: 969
Posted By lr172
Exhaust heat doesn't make it past the rockers. ...

Exhaust heat doesn't make it past the rockers. Pushrod temps at the lifter should be same -In Ex.
Forum: Steam Gauges 11-18-2021, 08:43 AM
Replies: 8
Views: 674
Posted By lr172
Yes, but not as simple as stated and definitely...

Yes, but not as simple as stated and definitely not 45*. Works very well on my 10 and this is now a vans option for the 12.

I put mine in the outer most bay of the wing so that I could access the...
Forum: Traditional Aircraft Engines 11-16-2021, 12:41 PM
Replies: 13
Views: 1,054
Posted By lr172
He answered it above. He has a Kavlico...

He answered it above. He has a Kavlico transducer and that sends a variable voltage. Therefore it must be connected to a device that can convert that variable voltage to a displayable pressure...
Forum: RV Ongoing Maintenance Issues 11-16-2021, 12:33 PM
Replies: 23
Views: 1,328
Posted By lr172
NOt in my experience (built two RV's and have...

NOt in my experience (built two RV's and have rebuild 4 RV full brake systems). Simply pushing fluid up from the bottom is not enough to evacuate all of the air in the master cylinder, like it does...
Forum: RV-10 11-16-2021, 11:54 AM
Replies: 31
Views: 2,365
Posted By lr172
+100 In my 6, I had a comm flip flop button on...

+100

In my 6, I had a comm flip flop button on the stick; I thought that would be neat and convenient. One day fighting the stick in turbulence, I accidentally pressed it. Dead silence on the...
Forum: Traditional Aircraft Engines 11-16-2021, 11:41 AM
Replies: 19
Views: 3,028
Posted By lr172
+1 On my 10, I ran them too close and got...

+1

On my 10, I ran them too close and got erratic EGT readings on two cylinders. Moved them, problem disappeared. No surprise, given their VERY low voltage signals.

These thermocouple signals are...
Forum: Traditional Aircraft Engines 11-15-2021, 02:39 PM
Replies: 13
Views: 1,054
Posted By lr172
The relief ball can get lodged in an open...

The relief ball can get lodged in an open position and cause issues. However, if cruising along at a steady RPM (oil flow volume and therefore pressure induced with a constant restriction is linear...
Forum: Electrical Systems 11-15-2021, 12:11 PM
Replies: 5
Views: 395
Posted By lr172
Most alternators have a fan, internal or...

Most alternators have a fan, internal or externa). These fans are directional, so will move air much more effectively when spun in the designed direction. Many here run auto alternators in the...
Forum: RV-10 11-15-2021, 09:15 AM
Replies: 19
Views: 1,460
Posted By lr172
Same here. Simple wedge on the rudder and no...

Same here. Simple wedge on the rudder and no damper. The 10 requires very little rudder when climbing at 130 Kts and have never noticed any tail wagging even in turbulence. Possible it's there,...
Forum: RV Ongoing Maintenance Issues 11-15-2021, 08:53 AM
Replies: 23
Views: 1,328
Posted By lr172
With an initial bleed (new system or completely...

With an initial bleed (new system or completely overhauled) I have found that you must exercise the pedal during the bleed process and often times must aggressively shake the pedal assembly during...
Forum: RV-10 11-15-2021, 08:42 AM
Replies: 31
Views: 2,365
Posted By lr172
I would change the 750 to a 650 and put the AP...

I would change the 750 to a 650 and put the AP panel above it. I use that panel a lot on X-C flights, especially IFR flights. With 3 PFD/MFD screens, not sure what you would be looking at on the...
Forum: Traditional Aircraft Engines 11-14-2021, 11:17 AM
Replies: 13
Views: 1,054
Posted By lr172
Healthy engines rarely lose half their pressure...

Healthy engines rarely lose half their pressure and come right back, at least not at a constant RPM and temp. Very low oil level (like a quart) can do this though, especially with thed nose pointed...
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