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Search: Posts Made By: scsmith
Forum: Engine Monitors 05-22-2022, 11:58 PM
Replies: 6
Views: 297
Posted By scsmith
I've worked around thermocouples in aero research...

I've worked around thermocouples in aero research my whole career, and I never saw an occasion where a TC would fail high. But the JPI engine monitor on our C-182B had a bad EGT probe last year and...
Forum: Primers 05-12-2022, 07:44 PM
Replies: 27
Views: 14,315
Posted By scsmith
One must appreciate the irony here. You want to...

One must appreciate the irony here. You want to use Stewart Systems because it is so environmentally friendly, yet you are contemplating prep with one of the most toxic and harmful substances on...
Forum: Traditional Aircraft Engines 05-12-2022, 07:22 PM
Replies: 4
Views: 382
Posted By scsmith
Among those to check: 1) ignition timing. ...

Among those to check:

1) ignition timing. Retarding the ignition just a little will drop CHT, and hardly affect power at all.

2) leaky baffles. People swear up and down their baffles are tight,...
Forum: RV-15 05-09-2022, 10:09 AM
Replies: 40
Views: 18,228
Posted By scsmith
Something with a lot of shear!

Something with a lot of shear!
Forum: RV General Discussion/News 04-29-2022, 11:44 PM
Replies: 19
Views: 2,638
Posted By scsmith
As far as I know, Vans does not supply any parts...

As far as I know, Vans does not supply any parts that are red-anodized
Forum: RV General Discussion/News 04-29-2022, 07:45 PM
Replies: 71
Views: 42,625
Posted By scsmith
Thanks everyone for contributing the various...

Thanks everyone for contributing the various specs.

In the sailplane world we use a waviness gauge that is colloquially known as a Johnson Gauge, named after Richard Johnson.

It consists of a disc...
Forum: RV General Discussion/News 04-28-2022, 10:53 PM
Replies: 71
Views: 42,625
Posted By scsmith
We are getting pretty close to being done. I...

We are getting pretty close to being done. I painted the flaps and ailerons yesterday. I prepped the first wing for painting today. With it all smooth and clean, it was really the first chance to...
Forum: RV General Discussion/News 04-28-2022, 10:48 PM
Replies: 71
Views: 42,625
Posted By scsmith
Sorry I just saw this question from almost two...

Sorry I just saw this question from almost two months ago. We were in a mind set of keeping things much like the standard wing installation for retrofit.

It is possible to put the tank vents out...
Forum: RV-9/9A 04-27-2022, 09:38 PM
Replies: 5
Views: 366
Posted By scsmith
Yes, it is way easier to wash/wipe off a coat of...

Yes, it is way easier to wash/wipe off a coat of primer on a part than it is to clean an old, weathered bare aluminum part.

Prime them now with rattle-can self-etching primer, then just give it a...
Forum: RV-12/RV-12iS 04-27-2022, 09:32 PM
Replies: 7
Views: 2,155
Posted By scsmith
HI all, I've posted about this before, but I...

HI all,

I've posted about this before, but I figured I would chime in here.

A major cause of 'heavy wing' is that the aileron brackets do not necessarily hold the aileron at the same height...
Forum: Fiberglass 04-21-2022, 10:03 AM
Replies: 4
Views: 649
Posted By scsmith
I would recommend you at least spray a coat of...

I would recommend you at least spray a coat of rattle can primer on it. UV is very damaging, very fast. Most cheap rattle can primers will wash off quickly with acetone, then you can do the...
Forum: Tools 04-18-2022, 07:45 PM
Replies: 25
Views: 2,137
Posted By scsmith
All the bare steel surfaces on my shop tools get...

All the bare steel surfaces on my shop tools get a coat of paste wax.
Forum: RV-10 04-10-2022, 10:36 PM
Replies: 6
Views: 884
Posted By scsmith
It looks to me that the seat belt anchor consists...

It looks to me that the seat belt anchor consists of two pieces, one on the inboard side, and one on the outboard side. The piece on the outboard side has a plate nut in the end for the seatbelt...
Forum: Tools 04-07-2022, 06:54 PM
Replies: 24
Views: 2,843
Posted By scsmith
Ooh! a 10-ft brake? Can I send you some jobs?

Ooh! a 10-ft brake? Can I send you some jobs?
Forum: RV-10 04-04-2022, 11:15 AM
Replies: 10
Views: 855
Posted By scsmith
We put Goodyear tubes in the Cessna towplane last...

We put Goodyear tubes in the Cessna towplane last year. It seemed like the 90-degree valve stem was the better choice, but it costs TWICE as much as the same tube with a straight valve stem.

The...
Forum: RV Ongoing Maintenance Issues 04-03-2022, 08:13 PM
Replies: 30
Views: 2,972
Posted By scsmith
Bob K. at HP Aircraft LLC (an advertiser here on...

Bob K. at HP Aircraft LLC (an advertiser here on VAF) would probably be willing to do the repair, charging for time and materials.

Bob won't do the paint though. You will get it back with grey...
Forum: Traditional Aircraft Engines 03-19-2022, 09:10 PM
Replies: 109
Views: 7,464
Posted By scsmith
The air-fuel ratio was not constant through the...

The air-fuel ratio was not constant through the test either - leaning toward best power as RPM is increasing - so that would also explain the rapid rise in torque, along with the increasing MAP.
Forum: Traditional Aircraft Engines 03-18-2022, 10:02 AM
Replies: 109
Views: 7,464
Posted By scsmith
This is the point. To have the torque value...

This is the point.

To have the torque value change that much over that rpm range seems very very unlikely. It might make sense for a 2-stroke "coming on the pipe".
Forum: Traditional Aircraft Engines 03-16-2022, 11:18 PM
Replies: 109
Views: 7,464
Posted By scsmith
I can't help wondering if there was a recording...

I can't help wondering if there was a recording error and your torque at 2500 RPM was actually 650 ft-lbs.

In this RPM range, torque curves are usually pretty flat.
Forum: RV-7/7A 03-13-2022, 07:23 PM
Replies: 65
Views: 15,843
Posted By scsmith
There is kind of a trade-off here. A small...

There is kind of a trade-off here. A small semicircle (like the RV-8) produces a lot of local acceleration around that tight curve. It won't separate, but it probably over-accelerates and then has...
Forum: RV Ongoing Maintenance Issues 03-08-2022, 05:28 PM
Replies: 11
Views: 1,103
Posted By scsmith
Light-hearted fun about avionics maintenance

I found this and got a chuckle.
23154
And of course, it is from Lucas, the prince of darkness
Forum: RV-8/8A 03-04-2022, 02:40 PM
Replies: 4
Views: 1,014
Posted By scsmith
There are several threads here on VAF about using...

There are several threads here on VAF about using the 380-150x5.00 tires, which are the largest size tires that fit on the standard 5" wheels. I have these and I am very happy with how much they...
Forum: RV Building Tips/Techniques 03-04-2022, 12:49 PM
Replies: 5
Views: 775
Posted By scsmith
This shouldn't be a problem. There are vendors...

This shouldn't be a problem. There are vendors that will mold acrylic or PETG lenses of any shape. You supply the plug. So in this case, you could give them your stock fiberglass tip, and they...
Forum: Electrical Systems 03-04-2022, 12:29 PM
Replies: 21
Views: 3,070
Posted By scsmith
This has always puzzled me - but then, I'm an...

This has always puzzled me - but then, I'm an aero guy.

An ignition coil works by having two concentric coils. The collapsing field in the primary coil when the current through it is interrupted...
Forum: Electrical Systems 03-04-2022, 12:19 PM
Replies: 21
Views: 3,070
Posted By scsmith
An important distinction that Bill makes here: ...

An important distinction that Bill makes here: Of course the starting current passes through the master contactor as well as the starter solenoid. But it is already on, and just has to handle that...
Forum: RV General Discussion/News 02-27-2022, 04:57 PM
Replies: 24
Views: 14,799
Posted By scsmith
Nice idea! Please consider doing the gear tower...

Nice idea!

Please consider doing the gear tower mod to provide access inside the gear towers. Better now than never.
Forum: RV General Discussion/News 02-27-2022, 02:01 PM
Replies: 4
Views: 1,357
Posted By scsmith
And, we got Mike Starkey to re-name the original...

And, we got Mike Starkey to re-name the original thread so the title makes more sense.

I still have the tapered aluminum spars that were depicted in the beginning of that thread. I had discussions...
Forum: RV General Discussion/News 02-27-2022, 01:26 PM
Replies: 71
Views: 42,625
Posted By scsmith
What you see here is the lower flap skin and the...

What you see here is the lower flap skin and the flap spar, hinged to the wing. It was necessary to do this step so that the top edge of the flap spar could be trimmed to the right height so that...
Forum: RV General Discussion/News 02-27-2022, 01:21 PM
Replies: 71
Views: 42,625
Posted By scsmith
You might wonder where we were able to come up...

You might wonder where we were able to come up with 8700 lbs of lead shot to do the static load test. It turns out that the main west-coast manufacturer of bird shot, Northwest Shot Manufacturing,...
Forum: RV General Discussion/News 02-27-2022, 01:11 PM
Replies: 71
Views: 42,625
Posted By scsmith
If the ailerons and flaps had been completed at...

If the ailerons and flaps had been completed at the time we did the static load test, we could have checked them for smooth, free movement at that time. But they were not. So, this will be an early...
Forum: RV Building Tips/Techniques 02-18-2022, 12:38 AM
Replies: 12
Views: 1,456
Posted By scsmith
I don't see an oil cooler yet. Firewall space...

I don't see an oil cooler yet. Firewall space is obviously going to be at a premium.

One suggestion/observation: mounting the oil filter on the firewall means additional hoses (more clutter,...
Forum: RV-6/6A 02-18-2022, 12:29 AM
Replies: 23
Views: 2,415
Posted By scsmith
summarizing the most likely causes mentioned from...

summarizing the most likely causes mentioned from the previous posts:

1) make sure your cooling intake ramps are closed off on the ends, so they are not just tunnels for the cooling flow to escape. ...
Forum: RV-7/7A 02-16-2022, 12:03 PM
Replies: 50
Views: 7,170
Posted By scsmith
John, I would recommend against this. I started...

John,

I would recommend against this. I started out with 3.5" scat, and recently changed to 4" scat with a good diffuser. If you use a small air supply, you won't have the ability to cool...
Forum: RV-8/8A 02-16-2022, 11:47 AM
Replies: 4
Views: 889
Posted By scsmith
It is actually not very stout. The 1/4" thick...

It is actually not very stout. The 1/4" thick portion is pretty easy to bend.

Pay close attention to the install instructions. The base of the big blocks are to be filed off so that they do not...
Forum: RV General Discussion/News 02-16-2022, 04:34 AM
Replies: 23
Views: 1,555
Posted By scsmith
Careful. I have a moderate-priced laser level,...

Careful. I have a moderate-priced laser level, (Bosch) and it is off by 1/8" in 12 ft. That is within the advertised spec.

The only way to get things really level is to use a spirit level, as...
Forum: RV Ongoing Maintenance Issues 02-10-2022, 12:43 PM
Replies: 20
Views: 1,851
Posted By scsmith
Mine is 12 yrs old and I have never done anything...

Mine is 12 yrs old and I have never done anything to it. Perhaps I should.

After Paul Dye had the experience of the selector knob turning on the shaft, leaving the valve in an in-between state,...
Forum: Safety 02-10-2022, 12:22 PM
Replies: 68
Views: 31,924
Posted By scsmith
I'm so glad to hear that this was all resolved...

I'm so glad to hear that this was all resolved well. I hope the rest of the airplane is solid and serves you well. Hopefully you have relieved it of its 'lemon' status and although you have been...
Forum: Traditional Aircraft Engines 02-09-2022, 07:11 PM
Replies: 4
Views: 1,138
Posted By scsmith
Dan, I think I understand from this that some...

Dan, I think I understand from this that some case modifications are required. So, if, for example my angle-valve 360 were in need of a top-end overhaul, I could not just simply bolt on 390...
Forum: Tools 02-09-2022, 07:03 PM
Replies: 9
Views: 1,219
Posted By scsmith
I really like JIS screwdrivers. Buy them at...

I really like JIS screwdrivers. Buy them at McMaster-Carr
Forum: RV-7/7A 02-09-2022, 10:23 AM
Replies: 14
Views: 1,286
Posted By scsmith
I don't think there is a down side. I finished...

I don't think there is a down side. I finished the fiberglass work on each component as I completed it. (do the wing tips come in the finishing kit?)
Forum: RV-7/7A 02-08-2022, 09:22 PM
Replies: 10
Views: 2,271
Posted By scsmith
Looks like you got your finishing kit ahead of...

Looks like you got your finishing kit ahead of your wing kit.
Forum: RV-14 02-08-2022, 09:08 PM
Replies: 10
Views: 1,528
Posted By scsmith
It sounds like your fuel flow may also be a...

It sounds like your fuel flow may also be a little low for sea level for that engine. I would have expected over 20 gph.
Forum: RV-8/8A 02-06-2022, 03:35 PM
Replies: 14
Views: 2,332
Posted By scsmith
I did the same, although I had mounted my pants...

I did the same, although I had mounted my pants 1/2" higher than standard to begin with. So I did need to make bulges to clear the brake calipers on the original install. I suppose I lost a knot or...
Forum: RV-8/8A 02-05-2022, 06:16 PM
Replies: 23
Views: 12,216
Posted By scsmith
An easy option to improve grass/dirt field...

An easy option to improve grass/dirt field capability is to put on 380x150-5.0 tires. Several threads here about that. They make a big improvement, without the expense of 6" wheels and...
Forum: RV General Discussion/News 02-02-2022, 07:10 PM
Replies: 19
Views: 3,364
Posted By scsmith
My impression is that the 'long bracket' in the...

My impression is that the 'long bracket' in the SkyDesigns set-up is stiff enough that that brace could be omitted.
Forum: RV General Discussion/News 02-02-2022, 12:34 PM
Replies: 19
Views: 3,364
Posted By scsmith
Brilliant.

Brilliant.
Forum: RV Ongoing Maintenance Issues 01-30-2022, 06:59 PM
Replies: 8
Views: 1,054
Posted By scsmith
Those specs are Minimum axial strength. Note...

Those specs are Minimum axial strength. Note that for the MS21044, the min required strength is 4580 for a 1/4-28 size, regardless of whether the nut is steel, aluminum, or CRES. The steel nuts...
Forum: RV Ongoing Maintenance Issues 01-30-2022, 12:50 PM
Replies: 8
Views: 1,054
Posted By scsmith
Yes, this is correct. In a shear application, the...

Yes, this is correct. In a shear application, the contact between the bolt and the parts is what matters. This is why close tolerance holes are important. The nut is just keeping the assembly...
Forum: RV Ongoing Maintenance Issues 01-25-2022, 12:31 PM
Replies: 13
Views: 2,100
Posted By scsmith
And of course, as per usual, Lemos needs to fly...

And of course, as per usual, Lemos needs to fly somewhere tomorrow, and despite a suspicious bunch of metal in the oil, will decide to fly before he gets the analysis results back.
Forum: RV Ongoing Maintenance Issues 01-24-2022, 08:23 PM
Replies: 9
Views: 1,566
Posted By scsmith
OK, update, now that I think I have everything...

OK, update, now that I think I have everything sorted out.

I pulled the battery out and took it to Batteries +, where they charged it overnight and load tested it. They said the battery was fine,...
Forum: RV Ongoing Maintenance Issues 01-22-2022, 07:45 PM
Replies: 9
Views: 1,566
Posted By scsmith
Thanks guys. Neither the 60A breaker for the...

Thanks guys.

Neither the 60A breaker for the alternator supply into the buss, nor the field breaker switch, 'popped'. It is encouraging and helpful info that if the crowbar engages, then the field...
Forum: RV Ongoing Maintenance Issues 01-22-2022, 10:00 AM
Replies: 9
Views: 1,566
Posted By scsmith
Strange Alternator + Battery Issue

I guess the best way to tell this, and ask questions about it, is to start from the beginning.

I replaced the Odyssey PC-680 battery about two weeks ago. Was fine for several flights.

I had an...
Forum: RV General Discussion/News 01-21-2022, 06:23 PM
Replies: 3
Views: 528
Posted By scsmith
Craig Catto can do it. At Westover. (Jackson).

Craig Catto can do it. At Westover. (Jackson).
Forum: RV General Discussion/News 01-18-2022, 09:55 PM
Replies: 6
Views: 849
Posted By scsmith
Thanks guys. Just to re-iterate, this was...

Thanks guys.

Just to re-iterate, this was plans-built, not a kit. So, I suppose, but don't know for sure that the 4130 tubing originated in the USA. The spruce probably came from Canada.

I will...
Forum: RV General Discussion/News 01-17-2022, 11:37 PM
Replies: 6
Views: 849
Posted By scsmith
Bringing a partially completed EAB (plans-built) into the USA from Canada?

Question for the brain-trust:

What is involved in driving across the border from Canada to the USA with a partially completed home-built airplane, built from plans?

Years ago I brought a...
Forum: RV General Discussion/News 01-17-2022, 12:03 AM
Replies: 10
Views: 829
Posted By scsmith
This is essentially the same cooler that Vans...

This is essentially the same cooler that Vans sells for the RV-10 and the angle-valve engines. I made a firewall mount similar to the RV-10 mount but with the angle adjusted to align with the engine...
Forum: RV-8/8A 01-16-2022, 11:58 PM
Replies: 27
Views: 2,952
Posted By scsmith
There is a baggage door support spring that I...

There is a baggage door support spring that I believe was original equipment on some Beechcraft baggage door. But don't try to buy it as a Beechcraft part, because it would be stupid-expensive. But...
Forum: RV General Discussion/News 01-13-2022, 06:06 PM
Replies: 51
Views: 10,979
Posted By scsmith
The time required to produce a daily shipping...

The time required to produce a daily shipping document for release would probably be greater than the time to crate a kit. Just adding more overhead. I think the queue will move fastest if everyone...
Forum: RV Building Tips/Techniques 01-10-2022, 05:25 PM
Replies: 15
Views: 1,522
Posted By scsmith
Thanks to all. Our mast is steel, and the weld...

Thanks to all. Our mast is steel, and the weld looks perfect.

Yes I see now that the location for the screws falls in the area where the wall has been substantially thickened to allow plenty of...
Forum: RV Building Tips/Techniques 01-10-2022, 12:31 AM
Replies: 15
Views: 1,522
Posted By scsmith
Thanks Bob.

Thanks Bob.
Forum: RV Building Tips/Techniques 01-09-2022, 08:58 PM
Replies: 15
Views: 1,522
Posted By scsmith
The question here is whether the shell material...

The question here is whether the shell material is thick enough to cut threads into.

I'm not worried about match-drilling a tap drill hole into it, controlling the depth to just go through the...
Forum: Electrical Systems 01-09-2022, 08:55 PM
Replies: 23
Views: 3,000
Posted By scsmith
Unknown. It was fine on the afternoon flight -...

Unknown. It was fine on the afternoon flight - was a pre-flight item to check tension. (could barely get a finger on it through the cooling inlet IIRC. It was fine for the evening return flight...
Forum: RV Building Tips/Techniques 01-09-2022, 08:47 PM
Replies: 15
Views: 1,522
Posted By scsmith
Dynon heated pitot/AOA mounting question

I am installing a Dynon heated pitot/AOA probe in our tapered composite wings for Bob Mills' Rocket 6. The Dynon instructions are pretty lean on how to attach the probe body to the mount strut. The...
Forum: Electrical Systems 01-09-2022, 06:45 PM
Replies: 23
Views: 3,000
Posted By scsmith
I had a broken belt on a C-152 early in my ASEL...

I had a broken belt on a C-152 early in my ASEL flying experience, on a night flight too.
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