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Search: Posts Made By: David Paule
Forum: RV-3 Today, 07:27 AM
Replies: 28
Views: 1,400
Posted By David Paule
Adding the stiffener has no effect upon the...

Adding the stiffener has no effect upon the forces at the top of the gear leg where it meets the engine mount. But eliminating the shimmy removes that undesirable dynamic load, and that's got to be...
Forum: RV-3 Yesterday, 07:11 PM
Replies: 28
Views: 1,400
Posted By David Paule
The idea of the stiffeners is to eliminate the...

The idea of the stiffeners is to eliminate the fore-aft motion if the gear leg as far as is reasonably possible.

With no motion, there can't be damping - damping requires motion to work.

And using...
Forum: RV-3 Yesterday, 08:21 AM
Replies: 28
Views: 1,400
Posted By David Paule
As for the material, what DanH...

As for the material, what DanH said.

========

DO NOT WELD TO THE GEAR LEG!

You'd destroy the heat-treatment of it and add a stress concentration. In fact, except for the RV-3 slider, there's no...
Forum: RV-3 06-30-2022, 08:08 PM
Replies: 28
Views: 1,400
Posted By David Paule
A small factoid might be of interest. Aluminum,...

A small factoid might be of interest. Aluminum, steel and magnesium all have about the same stiffness to density (i.e., weight) ratio. But the buckling resistance is based upon both the stiffener's...
Forum: RV-3 06-30-2022, 08:02 PM
Replies: 28
Views: 1,400
Posted By David Paule
They would save weight and reduce the...

They would save weight and reduce the effectiveness of the stiffener, but probably not by a huge bunch. They'd be best located adjacent to the gear leg since the stiffener's effectiveness is based...
Forum: RV-3 06-30-2022, 05:01 PM
Replies: 28
Views: 1,400
Posted By David Paule
A harmonic vibration in the stiffener is unlikely...

A harmonic vibration in the stiffener is unlikely to have any effect, assuming it even happens, which I'd doubt. In any case stiffener vibration would be out of the plane of the stiffener and of low...
Forum: Tools 06-30-2022, 01:36 PM
Replies: 11
Views: 545
Posted By David Paule
The Smart Tool is handy but the zero is awkward...

The Smart Tool is handy but the zero is awkward to set. And it tends to run through 9V batteries.

There's probably a better one out there for the money.

Dave
Forum: Tools 06-27-2022, 10:38 AM
Replies: 32
Views: 2,909
Posted By David Paule
Med's suggestion of putting things on wheels is a...

Med's suggestion of putting things on wheels is a very good one. I rearranged my shop when I finished the empennage and started the wings, again when I finished those and started the fuselage, when I...
Forum: RV-4 06-26-2022, 01:10 PM
Replies: 65
Views: 12,125
Posted By David Paule
Thanks, Paul, this is good to know. Dave RV-3B...

Thanks, Paul, this is good to know.

Dave
RV-3B under construction, on gear, engine hung
Forum: Alternative Engines 06-20-2022, 09:28 AM
Replies: 66
Views: 8,135
Posted By David Paule
IAS, or more accurately, calibrated airspeed...

IAS, or more accurately, calibrated airspeed (CAS), includes the effects of air density, and thus is the appropriate speed to use for everything except flutter. CAS is what the structure is designed...
Forum: RV-10 06-19-2022, 08:01 PM
Replies: 22
Views: 2,861
Posted By David Paule
Easy... put it here on VAF. There's a handy...

Easy... put it here on VAF. There's a handy section for it in the red ellipse.

27232

And looky there, that's my log as the most recent.

Dave
Forum: My RV Build Project 06-19-2022, 07:25 PM
Replies: 639
Views: 429,057
Posted By David Paule
Before I can do any of the engine stuff, I’ve got...

Before I can do any of the engine stuff, I’ve got to get the cowl into shape. You might remember that the cowl cheek extensions were pending. I received the gray fiberglass RV-4 extensions. And since...
Forum: Tools 06-19-2022, 08:12 AM
Replies: 0
Views: 364
Posted By David Paule
3D Printer Review

Since some of you like to play around with these, I thought you might be interested in a survey and review of some of them. Here it is:

https://www.space.com/best-3d-printers

I don't use them, by...
Forum: RV General Discussion/News 06-18-2022, 10:42 AM
Replies: 11
Views: 753
Posted By David Paule
Have the plane facing forward into the wind.......

Have the plane facing forward into the wind.... Should have mentioned that.

Dave
Forum: RV General Discussion/News 06-18-2022, 08:37 AM
Replies: 11
Views: 753
Posted By David Paule
I have had good results by reducing the tire...

I have had good results by reducing the tire pressure till it's noticeably low, tying the bottom of the landing gear to the trailer or flatbed, and then reinflating the tires. That tensions the ties...
Forum: RV-4 06-16-2022, 06:39 AM
Replies: 12
Views: 846
Posted By David Paule
In this case, it's not merely a castellated nut,...

In this case, it's not merely a castellated nut, it's a self-locking castellated nut, MS17825. Thinner MS17826 are also available. Belts and suspenders. And yes, later in the construction that joint...
Forum: RV-4 06-15-2022, 06:43 PM
Replies: 12
Views: 846
Posted By David Paule
My plane is an RV-3B, not a -4, and I had no idea...

My plane is an RV-3B, not a -4, and I had no idea what angle the strap would make to the mount. But I did have a length of honking big piano hinge. This was taken before I added rivets to those empty...
Forum: RV-10 06-15-2022, 06:38 PM
Replies: 3
Views: 617
Posted By David Paule
It's located quite closely to the pivot, so...

It's located quite closely to the pivot, so there's not a lot of leverage that it can exert on the stick.

Also, I'd insist that any control lock be something that blocks access to the controls, to...
Forum: Electrical Systems 06-13-2022, 09:10 AM
Replies: 6
Views: 753
Posted By David Paule
I have stripped a section maybe 1/2" long on the...

I have stripped a section maybe 1/2" long on the through-wire and soldered the added wire to it there. Slip some shrink tube over it and done.

Dave
Forum: My RV Build Project 06-12-2022, 11:55 AM
Replies: 49
Views: 6,133
Posted By David Paule
Should be fine now. With all those rivets the...

Should be fine now. With all those rivets the epoxy was unnecessary.

Dave
Forum: RV General Discussion/News 06-12-2022, 09:41 AM
Replies: 38
Views: 3,787
Posted By David Paule
Titanium isn't as good a material for this as the...

Titanium isn't as good a material for this as the 4130 shown in Steve's post (#15 above). Its modulus of elasticity, and hence it's capability to resist buckling, is about half that of steel. Of...
Forum: My RV Build Project 06-12-2022, 07:51 AM
Replies: 49
Views: 6,133
Posted By David Paule
Exactly. Doesn't matter much how you do it. Dave

Exactly. Doesn't matter much how you do it.

Dave
Forum: My RV Build Project 06-11-2022, 07:53 PM
Replies: 49
Views: 6,133
Posted By David Paule
This shows a cross-section, in blue, of what you...

This shows a cross-section, in blue, of what you have now. The red is a notional concept of an added flange. I expect that just one half would be fine (imagine just the left half of the red part)......
Forum: My RV Build Project 06-11-2022, 07:27 PM
Replies: 49
Views: 6,133
Posted By David Paule
Can you add a flange to the existing bridge?...

Can you add a flange to the existing bridge? Won't need to be much, and if you have a structural glue like 3M's 2216 B/A or West System's g/flex, you could just glue it, with proper prep, of course....
Forum: My RV Build Project 06-11-2022, 04:17 PM
Replies: 49
Views: 6,133
Posted By David Paule
25270 I hope there's an easy way to inspect and...

25270

I hope there's an easy way to inspect and repair this. It's likely to vibrate and possibly, over time, crack.

Dave
Forum: RV Building Tips/Techniques 06-11-2022, 08:00 AM
Replies: 16
Views: 1,860
Posted By David Paule
Can you countersink or drill the wedge to fit the...

Can you countersink or drill the wedge to fit the dimple? If so, then don't try to flatten it, just build on and you can simply fill the depression later.

I agree that flattening it will warp...
Forum: Tools 06-10-2022, 03:56 PM
Replies: 5
Views: 512
Posted By David Paule
That's my tool in post #3 in that thread. It...

That's my tool in post #3 in that thread. It worked well whenever I had a flange like yours, regardless of which direction it needed to go. But as the previous poster wrote, some flanges aren't...
Forum: VAF Classifieds (posts in here deleted after 30 days) 06-09-2022, 01:20 PM
Replies: 2
Views: 348
Posted By David Paule
Need a sonerai.net account to see the...

Need a sonerai.net account to see the photos....

Dave
Forum: RV General Discussion/News 06-08-2022, 07:24 PM
Replies: 5
Views: 825
Posted By David Paule
I have a couple of them.... these are good...

I have a couple of them.... these are good hats.

Dave
Forum: RV General Discussion/News 06-08-2022, 05:05 PM
Replies: 25
Views: 1,842
Posted By David Paule
I have a sump pad heater on my certified plane,...

I have a sump pad heater on my certified plane, and since my hangar is usually warm enough not to need it to fly, I've found it handy to use to heat up the oil for an oil change. Drains much better,...
Forum: My RV Build Project 06-07-2022, 07:30 PM
Replies: 639
Views: 429,057
Posted By David Paule
With the certified plane’s annual inspection...

With the certified plane’s annual inspection itself done, I can do a bit of work while waiting for some things to arrive to finish that job.

One thing I did was to caulk the firewall overlay around...
Forum: RV-3 06-07-2022, 04:35 PM
Replies: 19
Views: 4,317
Posted By David Paule
Some people have had success adding an aluminum...

Some people have had success adding an aluminum strip the length of the gear leg, attached by Adel clamps. It works by changing the fore-aft stiffness so it decouples from the up-down stiffness. On a...
Forum: RV General Discussion/News 06-06-2022, 07:44 AM
Replies: 2
Views: 267
Posted By David Paule
On my RV-3B, I made the aft deck removable, and...

On my RV-3B, I made the aft deck removable, and followed the plans by putting an access hole in the aftmost belly skin for the nut.

Dave
Forum: Electrical Systems 06-05-2022, 01:52 PM
Replies: 30
Views: 2,174
Posted By David Paule
I did what Erich did. By labeling each device's...

I did what Erich did.

By labeling each device's wires, and referring to the wiring diagram, it's easy to tell what's what, even if multiple devices are bundled together.

Dave
Forum: RV General Discussion/News 06-05-2022, 07:26 AM
Replies: 22
Wax
Views: 2,845
Posted By David Paule
Keith, the speed tweaks were four cowl exit...

Keith, the speed tweaks were four cowl exit iterations. Everything else has been keyed more toward efficiency....burning less fuel to go the same speed. Once upon a time typical was 183 at...
Forum: RV-14 06-02-2022, 09:15 AM
Replies: 46
Views: 6,067
Posted By David Paule
When I determined that wingtip tiedowns could...

When I determined that wingtip tiedowns could overload the spar on an RV-3B, I was using 70 mph winds to assess that. Remember, that's based on RV-3B geometry which differs a bit from the other RVs....
Forum: RV Building Tips/Techniques 06-01-2022, 07:20 PM
Replies: 6
Views: 710
Posted By David Paule
Working on my RV-3B project, I've concluded that...

Working on my RV-3B project, I've concluded that two clamps per location is relatively secure. Sometimes one clamp will permit shifting. And those 3/4" Cleco side clamps are extremely handy.

Dave
Forum: RV-14 06-01-2022, 11:37 AM
Replies: 46
Views: 6,067
Posted By David Paule
On the RV-3B, which sits very low to the ground,...

On the RV-3B, which sits very low to the ground, I was concerned about the sharp angle that the tiedown ropes made to the wing. That increases the load on the rope. Being a structural engineer, I...
Forum: RV General Discussion/News 06-01-2022, 09:38 AM
Replies: 13
Views: 977
Posted By David Paule
I found that Steinair's videos were really...

I found that Steinair's videos were really helpful. And I bought an inexpensive continuity tester that beeps when it has zero resistance, and used that to verify my cables.

I started with some of...
Forum: Tools 05-30-2022, 02:01 PM
Replies: 0
Views: 248
Posted By David Paule
FireBarrier Caulk Application Tool

I found that a 20 ml hobby syringe works pretty well. It will need to be refilled but it's small enough to fit on my RV-3B, which may have the tightest spaces of the line.

I tried using a vinyl hose...
Forum: RV-14 05-30-2022, 11:57 AM
Replies: 46
Views: 6,067
Posted By David Paule
See post #18 about tight radii on tiedown...

See post #18 about tight radii on tiedown fittings.

Dave
Forum: My RV Build Project 05-26-2022, 09:01 AM
Replies: 639
Views: 429,057
Posted By David Paule
The cowl cheek extensions arrived and as...

The cowl cheek extensions arrived and as expected, they don’t fit my RV-3B. Remember, they are RV-4 parts, so there’s no reason that they should. They are a bit short on width, skin to outboard face,...
Forum: RV-14 05-25-2022, 02:55 PM
Replies: 46
Views: 6,067
Posted By David Paule
I'm always bemused when people spend time and...

I'm always bemused when people spend time and money and often add weight redesigning something that works nicely as-is.

The Cleaveland tie down ring is fine if you use a carabiner with it. With...
Forum: RV General Discussion/News 05-25-2022, 01:11 PM
Replies: 16
Views: 1,086
Posted By David Paule
That engine shown in Wirejock's photo fit in the...

That engine shown in Wirejock's photo fit in the back of my '03 Toyota Tundra that has a shell on it. There was plenty of room. I expect that your shed, assuming it will fit through the door, is more...
Forum: Fiberglass 05-24-2022, 09:09 PM
Replies: 2
Views: 390
Posted By David Paule
DanH has a lot of useful information about...

DanH has a lot of useful information about fiberglass on VAF.

Dave
Forum: RV-3 05-24-2022, 10:15 AM
Replies: 6
Views: 721
Posted By David Paule
But does not lock the rudder.... I'd like a...

But does not lock the rudder....

I'd like a control lock that also locks the rudder, elevator and ailerons.

Dave
Forum: Primers 05-24-2022, 08:35 AM
Replies: 2
Views: 424
Posted By David Paule
I've used the stuff on my plane. Got it from...

I've used the stuff on my plane. Got it from Spruce but that was some time ago. Have to tell you that it sprays poorly, splattering and clogging quickly. Not recommended.

If you can download and...
Forum: RV Building Tips/Techniques 05-23-2022, 09:19 AM
Replies: 20
Views: 1,452
Posted By David Paule
I used a Malco HC1, which worked nicely. A bit of...

I used a Malco HC1, which worked nicely. A bit of a rough edge but plenty safe. It's essentially a guided router that attaches to a drill motor. Hint, drill the center hole and put a center post...
Forum: RV Building Tips/Techniques 05-22-2022, 01:44 PM
Replies: 10
Views: 978
Posted By David Paule
Well, what I think Van's doesn't want you to do...

Well, what I think Van's doesn't want you to do is smear it all over when you're just trying to get it in between the parts. These pictures show how to add additional, after-the-fact sealant. Note...
Forum: RV Building Tips/Techniques 05-22-2022, 08:49 AM
Replies: 10
Views: 978
Posted By David Paule
I found it helpful to slather up the parts and...

I found it helpful to slather up the parts and cleco them together, with a cleco in each hole. When the sealant is fully cured, then rivet. On the inside, topcoat each rivet with Type A sealant, per...
Forum: RV-12/RV-12iS 05-20-2022, 09:58 AM
Replies: 146
Views: 17,847
Posted By David Paule
Might be worth renting a truck or trailer and...

Might be worth renting a truck or trailer and bringing it home yourself.

Dave
Forum: RV General Discussion/News 05-19-2022, 06:39 PM
Replies: 46
Views: 5,279
Posted By David Paule
Turbulence is one of the two things I hate about...

Turbulence is one of the two things I hate about flying. I've found that as I got older and flew less, my tolerance decreased. I expect that if I fly more it'll improve. Still, changing altitude for...
Forum: RV General Discussion/News 05-17-2022, 07:59 AM
Replies: 8
Views: 920
Posted By David Paule
I know Sam and his wife and child. They are about...

I know Sam and his wife and child. They are about the nicest people I've ever met. They're doing a good job on the plane, too.

I'm glad to call them friends.

Dave
Forum: My RV Build Project 05-14-2022, 07:24 PM
Replies: 639
Views: 429,057
Posted By David Paule
Along with the cowl cheek bulkhead flange...

Along with the cowl cheek bulkhead flange orientation, there’s another burning question. Do the cowl cheek extensions end at the spar bulkhead as shown in SK-86 or do they extend aft a...
Forum: Primers 05-14-2022, 12:10 PM
Replies: 25
Views: 2,017
Posted By David Paule
I use lacquer thinner, then the maroon...

I use lacquer thinner, then the maroon Scotchbrite, then either lacquer thinner or isopropyl alcohol, at least 91%. Clean it enough so that there's no trace of anything left on your rag or paper...
Forum: Traditional Aircraft Engines 05-12-2022, 12:53 PM
Replies: 8
Views: 874
Posted By David Paule
Carbon can be very thermally conductive. I've had...

Carbon can be very thermally conductive. I've had clients use it specifically for that attribute, as a heat conductor. If you design such a thing, it's something to consider. Its thermal deformation,...
Forum: RV General Discussion/News 05-11-2022, 08:04 AM
Replies: 35
Views: 3,045
Posted By David Paule
As Mike said, using a robot vacuum is a definite...

As Mike said, using a robot vacuum is a definite shop aid. It's in addition to your regular shop vac, which you'll also need. The thing about the robot vacuum is that you need to allow for it to go...
Forum: RV General Discussion/News 05-10-2022, 07:31 PM
Replies: 35
Views: 3,045
Posted By David Paule
Electric outlets at just above workshop height,...

Electric outlets at just above workshop height, located every 4' or 5' apart, all around all the walls. Extra outlets near the large door.

Dave
Forum: RV Building Tips/Techniques 05-10-2022, 11:16 AM
Replies: 3
Views: 498
Posted By David Paule
You're better off getting the MS21042 nuts...

You're better off getting the MS21042 nuts instead, since that specification explicitly says that it is interchangeable with AN365 nuts, which the nut you mentioned does not. As for finish, Aircraft...
Forum: RV-3 05-09-2022, 11:13 AM
Replies: 10
Views: 3,934
Posted By David Paule
The accident appears to have been caused by...

The accident appears to have been caused by unrelated factors from whether or not the plane was being operated as an open-cockpit plane.

Dave
Forum: RV General Discussion/News 05-09-2022, 10:24 AM
Replies: 9
Views: 816
Posted By David Paule
Or you can get a can and try it yourself. When I...

Or you can get a can and try it yourself.

When I bought my C180, the interior was quite dirty. The plane was over 30 years old at the time and while the upholstery was fine, the belly and tailcone...
Forum: RV General Discussion/News 05-08-2022, 04:41 PM
Replies: 9
Views: 816
Posted By David Paule
Even the smallest hole I tried had a steady...

Even the smallest hole I tried had a steady stream of water from it, until the water got to within maybe 1/4", when it started dripping. Should have mentioned that. The larger holes had less drip...
Forum: RV General Discussion/News 05-08-2022, 01:13 PM
Replies: 9
Views: 816
Posted By David Paule
Drain Hole Diameter vs. Drain Time

Since I hadn't seen any quantitative data for this, I decided to test it.

The test set-up was an empty 4 oz. can of chiles, set up on a rack in the kitchen sink so that I could have ready access to...
Forum: ADS-B 05-06-2022, 06:15 PM
Replies: 5
Views: 489
Posted By David Paule
I have no idea what units Garmin likes to play...

I have no idea what units Garmin likes to play with, but I have Lynx NGT-9000. It's a nice unit if you have room for it. It has two tiny screens that you can configure. The screens are sharp, clear...
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