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Search: Posts Made By: scsmith
Forum: RV-3 07-01-2022, 05:23 PM
Replies: 29
Views: 1,866
Posted By scsmith
I wonder about introducing some actual damping...

I wonder about introducing some actual damping into this system. For example, if the holes in the aluminum plate were drilled 5/16" and then filled with short rubber bushings made from 5/16"...
Forum: Propellers 06-29-2022, 09:57 AM
Replies: 5
Views: 388
Posted By scsmith
In principle, yes, enough leverage and one should...

In principle, yes, enough leverage and one should be able to turn the blades. With aluminum blades, I would be comfortable doing that. With the light carbon composite blades, uhmmmm, rather not.
Forum: Propellers 06-28-2022, 11:51 PM
Replies: 5
Views: 388
Posted By scsmith
Whirl Wind HRT prop and standard Vans cowl

I recently changed from the Whirl Wind 200RV prop to the Whirl Wind 72HRT prop. I have a standard Vans cowl.

The HRT blades are a fair bit wider, and the folks at Whirl Wind Aviation supplied a...
Forum: RV-10 06-26-2022, 11:30 AM
Replies: 10
Views: 853
Posted By scsmith
What is your GAMI spread? it might be that #6 is...

What is your GAMI spread? it might be that #6 is a bit leaner, and a 0.005" increase in injector size on that cylinder could make it very happy. Don Rivera at Airflow Performance is very helpful...
Forum: Alternative Engines 06-20-2022, 07:36 PM
Replies: 66
Views: 8,296
Posted By scsmith
What is the displacement of the Yamaha? The...

What is the displacement of the Yamaha?

The speed reduction gears at the links that DanH posted seem to have large reduction ratios, suggesting the engine is turning at very high RPM.
What is the...
Forum: Fiberglass 06-13-2022, 09:55 PM
Replies: 21
Views: 1,497
Posted By scsmith
We have done layups with 10--15 plies all at...

We have done layups with 10--15 plies all at once. If it gets too soupy with resin, just put down a ply of cloth dry and blot it to pull excess resin up to wet out the new ply. Keep doing this as...
Forum: Fiberglass 06-13-2022, 12:08 PM
Replies: 21
Views: 1,497
Posted By scsmith
You can do it either way: stop, add peel ply,...

You can do it either way:

stop, add peel ply, allow to cure, then scuff sand and continue.

or, just keep laying on more plies. Unless you are going to vacuum bag it, you don't really care that it...
Forum: RV Ongoing Maintenance Issues 06-13-2022, 11:08 AM
Replies: 14
Views: 1,170
Posted By scsmith
Pegasus Auto Racing and Summit both have molded...

Pegasus Auto Racing and Summit both have molded silicone hoses that are perfect for what I need. But they say in the fine print that they are not resistant to oil. I imagine they would be better...
Forum: RV Ongoing Maintenance Issues 06-12-2022, 10:57 PM
Replies: 14
Views: 1,170
Posted By scsmith
That doesn't really help solve the issue of the...

That doesn't really help solve the issue of the 90-degree elbows
Forum: RV Ongoing Maintenance Issues 06-12-2022, 10:00 PM
Replies: 14
Views: 1,170
Posted By scsmith
breather pipe suggestions?

I have an aluminum 5/8" diameter breather pipe running down my firewall, perfectly bent to terminate just above the exhaust pipe, just how I like it.

The engine breather fitting is a 3/4" tube...
Forum: California 06-12-2022, 08:03 PM
Replies: 14
Views: 1,294
Posted By scsmith
Bay coastal stratus is rare, actually

San Carlos and Palo Alto airports are both VFR the vast majority of the time. The amount of morning fog penetration (coastal stratus) varies quite a bit from none to overcast all day, but the days...
Forum: RV General Discussion/News 06-12-2022, 07:06 PM
Replies: 38
Views: 3,831
Posted By scsmith
Hi Ryan, Kyle answered your primary question I...

Hi Ryan,

Kyle answered your primary question I think. The fitting that is supplied in the kit is a combination of a rod bearing and a threaded stud that is attached to the spherical ball - it is...
Forum: RV General Discussion/News 06-11-2022, 07:02 PM
Replies: 38
Views: 3,831
Posted By scsmith
I have forgotten the exact numbers, but I once...

I have forgotten the exact numbers, but I once calculated the airspeed needed for the standard aluminum tube to buckle. It was closer to the max flap speed than I would like. the OP here probably...
Forum: RV General Discussion/News 06-11-2022, 05:14 PM
Replies: 38
Views: 3,831
Posted By scsmith
I agree with Butch, everything sounds OK. You...

I agree with Butch, everything sounds OK. You may benefit in speed by rigging your flaps and ailerons up just a bit more. Are the lower skins of the flaps up tight against the belly of the...
Forum: RV General Discussion/News 06-11-2022, 12:13 PM
Replies: 38
Views: 3,831
Posted By scsmith
Here is a picture of the better way to attach the...

Here is a picture of the better way to attach the flap pushrod to the flap, instead of the integral studded rod bearings that are used in the kit which do not have a positive capture feature:
26914
Forum: RV General Discussion/News 06-11-2022, 11:51 AM
Replies: 38
Views: 3,831
Posted By scsmith
Most of the advise here is on the mark. While...

Most of the advise here is on the mark.

While you have the flap pushrods off, whether they are bent or not, make new ones from 4130 steel tubing. Buy 5/16" tubing and run a 1/4-28 tap into the...
Forum: RV General Discussion/News 06-10-2022, 10:06 PM
Replies: 12
Views: 1,908
Posted By scsmith
I have it on good authority that the Monday...

I have it on good authority that the Monday flyover, in honor of Van's 50th anniversary, will be a 50-ship formation fly-over. Not sure of the timing. So plan to be there Monday early and stay all...
Forum: RV General Discussion/News 06-08-2022, 08:57 PM
Replies: 31
Views: 3,184
Posted By scsmith
But there has been some change to the...

But there has been some change to the nomenclature, right? I think they used to say that after a major mod, you were to notify the FSDO and go back into "Phase I" for a specified test period.
Now...
Forum: RV General Discussion/News 06-08-2022, 05:46 AM
Replies: 33
Views: 11,342
Posted By scsmith
Actually racing is one place where you don't need...

Actually racing is one place where you don't need any extra spark advance. You will be running best power mixture (AFR=12.5:1) or even richer to manage temps. Keeping the timing in the 20--25 BTDC...
Forum: Traditional Aircraft Engines 06-06-2022, 07:47 PM
Replies: 33
Views: 2,075
Posted By scsmith
Thanks. So I gather that Michael (Toobuilder) is...

Thanks. So I gather that Michael (Toobuilder) is suggesting that the plunger and spring be installed. If I understand its function, it forces oil through the cooler always, unless the oil pressure...
Forum: Traditional Aircraft Engines 06-06-2022, 01:42 PM
Replies: 33
Views: 2,075
Posted By scsmith
Michael, could you elaborate a little on what the...

Michael, could you elaborate a little on what the viscosity valve is and where it goes? A search on Aircraft Spruce turned up nothing.

I've never heard of this, and probably many others haven't...
Forum: Oregon 06-03-2022, 10:19 AM
Replies: 3
Views: 464
Posted By scsmith
Bruce, my hangar at Ashland is empty right now,...

Bruce, my hangar at Ashland is empty right now, you are welcome to it. It will be a couple more weeks before I am ready to move my RV-8 back in.

jlp-scs@pacbell.net
Forum: RV General Discussion/News 05-30-2022, 11:35 AM
Replies: 8
Views: 716
Posted By scsmith
wow, pricey. Doesn't our very own Steve Melton...

wow, pricey.

Doesn't our very own Steve Melton make one?
Forum: RV General Discussion/News 05-29-2022, 07:35 PM
Replies: 25
Views: 4,720
Posted By scsmith
This made me laugh. To change the alternator...

This made me laugh. To change the alternator belt, you have to pull the prop - not something that would normally be done on a condition inspection, and not something that one would typically...
Forum: RV-8/8A 05-27-2022, 06:29 PM
Replies: 30
Views: 4,829
Posted By scsmith
OMG! This is really bad. This is surely your...

OMG! This is really bad. This is surely your problem. You guys are lucky the plane was safe to fly. The flow leaking through a narrow gap along the wing root not only puts really dirty air onto...
Forum: Engine Monitors 05-22-2022, 11:58 PM
Replies: 6
Views: 561
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: 14,653
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: 606
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: 20,270
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: 2,837
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: 76
Views: 45,206
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: 76
Views: 45,206
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: 76
Views: 45,206
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: 434
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: 2,252
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: 734
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: 2,329
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: 7
Views: 1,166
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: 3,180
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: 922
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: 3,441
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: 8,081
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: 8,081
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: 8,081
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: 16,711
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: 1,140
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: 1,096
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: 801
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: 3,314
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: 3,314
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: 14,944
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: 1,390
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: 76
Views: 45,206
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: 76
Views: 45,206
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: 76
Views: 45,206
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: 1,563
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: 2,669
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: 7,804
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: 931
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: 1,709
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: 1,998
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: 32,391
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: 1,161
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: 1,288
Posted By scsmith
I really like JIS screwdrivers. Buy them at...

I really like JIS screwdrivers. Buy them at McMaster-Carr
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