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Search: Posts Made By: scsmith
Forum: Fuel Injection Systems 11-27-2022, 01:37 PM
Replies: 11
Views: 387
Posted By scsmith
Seems like the pedestal venturi would contribute...

Seems like the pedestal venturi would contribute similar blockage that the throat venturi does. It would be interesting to measure the total cross section area at the max blockage point of the...
Forum: Fuel Injection Systems 11-26-2022, 09:44 PM
Replies: 11
Views: 387
Posted By scsmith
Thanks Ross, I think that is right for the...

Thanks Ross,

I think that is right for the carburetor, and perhaps correct for the minimum throat diameter of the RSA-5, but I think the throttle plate is closer to 2.75"? (70mm?)

If I didn't have...
Forum: Fuel Injection Systems 11-26-2022, 08:04 PM
Replies: 11
Views: 387
Posted By scsmith
Throttle body bore diameter?

Why is it that throttle body bore diameter must be the best kept secret in aviation. I can not find the bore diameter of an RSA-5 fuel control/throttle body or for a Marvel Schebler M4-5...
Forum: Electrical Systems 11-21-2022, 04:31 PM
Replies: 37
Views: 1,716
Posted By scsmith
hall effect devices?

Are the hall effect devices on the alternator outputs used in lieu of shunt resisters to measure current?
Forum: RV-9/9A 11-21-2022, 03:02 PM
Replies: 13
Views: 1,494
Posted By scsmith
Michael, sending you a PM to take the intake...

Michael,
sending you a PM to take the intake discussion out of the thread.
Forum: RV-9/9A 11-20-2022, 02:12 PM
Replies: 13
Views: 1,494
Posted By scsmith
Michael, Evidence from Dan Chekaway (sp?) when...

Michael,

Evidence from Dan Chekaway (sp?) when he did a lot of testing on inlet snorkels was that if you do a good design of the snorkel intake that incorporates a filter on the left cooling ramp,...
Forum: RV Building Tips/Techniques 11-19-2022, 12:28 PM
Replies: 6
Views: 963
Posted By scsmith
I do the same thing that Mickey does. These...

I do the same thing that Mickey does.
These Pegasus Racing washers are $1.80 each. And heavy. Of course, you don't use very many of them, so in the big scheme of things, they are not a bad choice.
Forum: RV-8/8A 11-18-2022, 08:48 PM
Replies: 8
Views: 553
Posted By scsmith
A key thing to keep an eye on as you fit the tip...

A key thing to keep an eye on as you fit the tip is the effective dihedral of the tip. It is not sufficient to get a good match at the aileron. You have to insure that the straight line of the...
Forum: VAF Classifieds (posts in here deleted after 30 days) 11-17-2022, 01:25 PM
Replies: 5
Views: 725
Posted By scsmith
Well, I guess I was right, no one makes up their...

Well, I guess I was right, no one makes up their own hose assemblies anymore?

Not a single response!

Just in case, one thread-bump here before I give up.
Forum: RV-8/8A 11-16-2022, 05:20 PM
Replies: 48
Views: 7,111
Posted By scsmith
That is what is so cool about the Thunder Mustang...

That is what is so cool about the Thunder Mustang by the way. The Falonner V-12 in it has separate pipes and sounds pretty much like a higher-pitched Merlin. The Thunder Mustang is also an...
Forum: RV General Discussion/News 11-14-2022, 11:55 PM
Replies: 25
Views: 2,976
Posted By scsmith
Hope the rescuers coming to your aid are not...

Hope the rescuers coming to your aid are not deterred by the sound of 9mm bullets wizzing by.
Forum: RV General Discussion/News 11-14-2022, 11:28 PM
Replies: 19
Views: 3,849
Posted By scsmith
For all kinds of brackets and things, like bell...

For all kinds of brackets and things, like bell cranks, control horns, mounting brackets, I make a drawing and take the material down to our local water-jet cutting place. For very little money,...
Forum: Electrical Systems 11-14-2022, 09:00 PM
Replies: 42
Views: 2,521
Posted By scsmith
Walt, I'm confused. In post #9 you said you do...

Walt, I'm confused. In post #9 you said you do put avionics master switches in the panels you build. Then in posts #11 and #13 you seem to imply ( KISS) that you don't? I must be misunderstanding...
Forum: RV General Discussion/News 11-14-2022, 08:14 PM
Replies: 25
Views: 2,976
Posted By scsmith
I have a hard time imagining how I am going to...

I have a hard time imagining how I am going to swing a hatchet inside the cockpit of an RV-8, hanging upside down.
Forum: RV General Discussion/News 11-14-2022, 07:28 PM
Replies: 25
Views: 2,976
Posted By scsmith
Yes, I think it is great to revive this...

Yes, I think it is great to revive this thread.

A particular concern is that being upside down, hanging from your harness, it would be hard to get any significant 'swing' to a hammer-type device. I...
Forum: Electrical Systems 11-14-2022, 04:24 PM
Replies: 42
Views: 2,521
Posted By scsmith
Yes, it seems that the EMS (or EFIS with engine...

Yes, it seems that the EMS (or EFIS with engine info displayed) is the one box that you want to power up with the main master, not on an avionics master. That way it is up and running for engine...
Forum: Fiberglass 11-14-2022, 03:59 PM
Replies: 11
Views: 1,014
Posted By scsmith
All the comments here are great and should help...

All the comments here are great and should help you to get good results. I can add a few additional tidbits and other ideas.

Vacuum pumps: A diaphragm airbrush compressor can be configured to be a...
Forum: Electrical Systems 11-14-2022, 03:19 PM
Replies: 42
Views: 2,521
Posted By scsmith
I think the main purpose of an avionics master...

I think the main purpose of an avionics master switch is to protect avionics from big spikes in voltage that can occur as the engine is starting or stopping. I don't claim to understand what in the...
Forum: Propellers 11-14-2022, 03:04 PM
Replies: 43
Views: 2,493
Posted By scsmith
I meant to also add that if the prop truly was at...

I meant to also add that if the prop truly was at a node, the prop blades would not get excited. The fact that there are certain prop/engine combinations with certain no-continuous-operation...
Forum: Propellers 11-14-2022, 01:34 PM
Replies: 43
Views: 2,493
Posted By scsmith
This is a really good discussion, but I can't...

This is a really good discussion, but I can't help poke a little light-heartedness into it, while hopefully some additional insight.

In principle, if the FEA was of such fine resolution that every...
Forum: VAF Classifieds (posts in here deleted after 30 days) 11-12-2022, 06:34 PM
Replies: 5
Views: 725
Posted By scsmith
F/S Aeroquip hose end fittings

When I built my RV-8, I made up all of my own hose assemblies, from Aeroquip 601/AE701 stainless braided hose. After they were all made, I daisy-chained them all together, filled them with oil, and...
Forum: RV-10 11-11-2022, 06:03 PM
Replies: 77
Views: 15,047
Posted By scsmith
Since it is now fairly clear that Vans DOES allow...

Since it is now fairly clear that Vans DOES allow the Sky Designs Wing Tank ER Mod, I wonder if a moderator might change the title of this long thread so it more accurately characterizes the...
Forum: RV-14 11-10-2022, 04:03 PM
Replies: 2
Views: 374
Posted By scsmith
Does that 'exit' door have an air pathway into...

Does that 'exit' door have an air pathway into the engine compartment to allow additional cooling? Not evident from the pictures, so just curious.
Forum: Alternative Engines 11-10-2022, 12:02 PM
Replies: 40
Views: 2,952
Posted By scsmith
A bit of thread drift, but yes, the Thunder...

A bit of thread drift, but yes, the Thunder Mustang is very delightful to fly. Nothing super-light and quick like an RV, but medium-light, well-harmonized and responsive. (nothing at all like the...
Forum: Alternative Engines 11-10-2022, 11:46 AM
Replies: 40
Views: 2,952
Posted By scsmith
Yes, that is certainly true for a fully...

Yes, that is certainly true for a fully underslung system. I was more referring to problems with the partially internal system. And you are right, on a typical TM, that actuator does provide a big...
Forum: Alternative Engines 11-09-2022, 07:25 PM
Replies: 40
Views: 2,952
Posted By scsmith
You would not cut the longerons, of course. The...

You would not cut the longerons, of course. The whole cooler duct system would be enough narrower than the fuselage to fit in between the longerons.

The principle role of the belly skin is...
Forum: Alternative Engines 11-09-2022, 07:14 PM
Replies: 40
Views: 2,952
Posted By scsmith
Ross, the TM I flew had a well-sealed duct, and...

Ross, the TM I flew had a well-sealed duct, and as I recall looking inside, the internal duct did only expose the radiator core. The bar that is visible in your picture is the edge of another heat...
Forum: Alternative Engines 11-09-2022, 02:21 PM
Replies: 40
Views: 2,952
Posted By scsmith
Burying a reasonable fraction (half) of the...

Burying a reasonable fraction (half) of the radiators inside the existing mold lines really helps with trying to get minimum cooling system drag (or even a little bit of thrust). Not that it can't be...
Forum: RV Building Tips/Techniques 11-09-2022, 12:52 PM
Replies: 19
Views: 814
Posted By scsmith
The problem with the two sensor approach is that...

The problem with the two sensor approach is that you are introducing a second potential failure point. Wired in series, if either sensor fails, then the reading will be wrong. These sensors,...
Forum: Fiberglass 11-06-2022, 06:00 PM
Replies: 11
Views: 1,059
Posted By scsmith
We have found that dacron interfacing from the...

We have found that dacron interfacing from the fabric store works ok. Not great, but OK. Select an interfacing that has a good surface sheen to it. It releases much better than the material that is...
Forum: RV-7/7A 11-05-2022, 12:54 AM
Replies: 80
Views: 21,158
Posted By scsmith
I wouldn't bother sealing the upper lip. The...

I wouldn't bother sealing the upper lip. The flow will attach itself to the bump somewhere out away from the firewall and flow smoothly.

The end treatments are a judgement call. One school might...
Forum: RV-8/8A 11-04-2022, 11:51 PM
Replies: 12
Views: 2,087
Posted By scsmith
I'm wondering if the price may come down as these...

I'm wondering if the price may come down as these become more widely used?

It looks like the lowest priced kit for a certificated airplane is $870 at ACS. Many companies offer a parallel product...
Forum: RV-7/7A 11-04-2022, 11:27 PM
Replies: 80
Views: 21,158
Posted By scsmith
For the -A models

One idea for the A models that are side-by-side with a flat belly would be to completely remove the 'coal shovel' outlet on the cowl and create two new outlets on either side of the nose gear. The...
Forum: RV-7/7A 11-04-2022, 11:19 PM
Replies: 80
Views: 21,158
Posted By scsmith
That looks good Terry

That looks good Terry
Forum: RV General Discussion/News 11-01-2022, 05:41 PM
Replies: 12
Views: 974
Posted By scsmith
I have also found McMaster shipping to be...

I have also found McMaster shipping to be ridiculous. Often much more than the order. My biggest complaint is that you don't have much visibility into the shipping charges and options until after...
Forum: RV General Discussion/News 11-01-2022, 02:28 PM
Replies: 12
Views: 974
Posted By scsmith
I buy a lot of stainless steel torx-style screws...

I buy a lot of stainless steel torx-style screws at

https://www.microfasteners.com

They carry a wide variety of screws of course.

For aircraft hardware I either go to ACS or GAHco.
Forum: RV-8/8A 11-01-2022, 02:01 PM
Replies: 16
Views: 2,042
Posted By scsmith
Plus one. I did the same thing, for the same...

Plus one. I did the same thing, for the same reasons. There is a lot more stuff in there than just the filter and boost pump. Nice to have it out of sight.


An 0.020" panel weighs next to...
Forum: RV-8/8A 10-31-2022, 07:46 PM
Replies: 17
Poll: RV-8 Carpet?
Views: 1,323
Posted By scsmith
Too bad the poll doesn't allow multiple...

Too bad the poll doesn't allow multiple selections. I do already have carpet, home-made from something that is probably not as fire-resistant as it should be.

If carpet pieces are offered that...
Forum: RV-7/7A 10-29-2022, 01:58 PM
Replies: 11
Views: 770
Posted By scsmith
I'd like to know if the newer -7/7A rudder (from...

I'd like to know if the newer -7/7A rudder (from the RV-9) has wider chord than the early -7/7A rudder (from the RV-8) or if it is just the taller tip cap and counterweight area?

And by extension,...
Forum: Painting your RV 10-26-2022, 08:14 PM
Replies: 30
Views: 2,985
Posted By scsmith
There is quite a broad price spread between...

There is quite a broad price spread between various product lines of essentially the same paint formulation within PPG. A gallon of single-stage white PPG Concept is something like $900. But a...
Forum: Propellers 10-24-2022, 01:56 PM
Replies: 11
Views: 2,225
Posted By scsmith
There is typically a good amount of padding at...

There is typically a good amount of padding at the tip to the end of the box. If it was just rotated to vertical, I wouldn't worry about for a second.

If it was dropped 3 ft from the truck deck...
Forum: RV-12/RV-12iS 10-23-2022, 12:36 AM
Replies: 27
Views: 6,854
Posted By scsmith
Just as a point of information, under FAR Part 25...

Just as a point of information, under FAR Part 25 (transport catagory) mass balance/counterweight systems are to be designed for limit load of 100 g's in primary motion direction and (IIRC) 30 g's in...
Forum: RV-8/8A 10-18-2022, 07:09 PM
Replies: 48
Views: 7,111
Posted By scsmith
I agree! The Thunder Mustang is the...

I agree! The Thunder Mustang is the nicest-handling airplane I have ever flown.
Forum: RV-8/8A 10-17-2022, 08:46 PM
Replies: 48
Views: 7,111
Posted By scsmith
If I recall, there are two different bell crank...

If I recall, there are two different bell crank or horn positions that can be selected for the P-51 ailerons. One position gives full aileron throw for maneuverability, but gives quite heavy aileron...
Forum: Safety 10-17-2022, 12:44 PM
Replies: 34
Views: 3,937
Posted By scsmith
It seems like steel rivets may be a benefit. If...

It seems like steel rivets may be a benefit. If the heads of aluminum rivets exposed on the engine side melt, or even soften severely, then the aluminum support structure will fall apart some time...
Forum: Safety 10-17-2022, 12:35 PM
Replies: 34
Views: 3,937
Posted By scsmith
A key question about the MAFTEC blanket material...

A key question about the MAFTEC blanket material is how conductive it is.
For firewall treatment, we need two things. 1) able to withstand the high temperatures, and 2) have a fairly low thermal...
Forum: RV Ongoing Maintenance Issues 10-17-2022, 12:23 AM
Replies: 42
Views: 5,139
Posted By scsmith
Yes, it is a helpful thing that aviation motor...

Yes, it is a helpful thing that aviation motor oil has a fluorescent dye in it for leak detection. I used to use Aeroshell 100 for flow visualization work in the wind tunnels at work.
Forum: RV-8/8A 10-15-2022, 06:13 PM
Replies: 4
Views: 693
Posted By scsmith
A good time to replace those horrible NAS679-6...

A good time to replace those horrible NAS679-6 nuts too. Get new NAS6606-27 bolts (longer threaded portion than the standard NAS6206-27) and new NAS1804-6 nuts.

Search for the old thread called...
Forum: Propellers 10-13-2022, 04:06 PM
Replies: 6
Views: 953
Posted By scsmith
In 2014, my WW 200RV was slinging grease badly...

In 2014, my WW 200RV was slinging grease badly enough that I decided to get a hub overhaul, at 300 hrs. I was told at that time by the folks in OH that there was a compatibility problem with a...
Forum: Steam Gauges 10-11-2022, 04:15 PM
Replies: 5
Views: 1,164
Posted By scsmith
The little insert that you put inside the tubing...

The little insert that you put inside the tubing to help support it is really beneficial. With those in place I never have any leaks, even in static pressure lines that are usually at a slight...
Forum: Traditional Aircraft Engines 10-10-2022, 08:40 PM
Replies: 6
Views: 995
Posted By scsmith
Many years ago, my Citabria 7KCAB had plain...

Many years ago, my Citabria 7KCAB had plain rubber conical mounts, and we switched to a newer heavier-duty style of Lord conical mount. The results were well worth it. They probably didn't hurt our...
Forum: Probable Cause Documents Discussed 10-05-2022, 12:21 PM
Replies: 4
Views: 1,317
Posted By scsmith
That is a reasonable fuel flow for take-off power...

That is a reasonable fuel flow for take-off power at sea level. I don't think it is a reasonable fuel flow for 2000 rpm run-up test.
Forum: RV Building Tips/Techniques 09-29-2022, 07:24 PM
Replies: 40
Views: 9,296
Posted By scsmith
PLUS ONE on removing amine blush with warm soapy...

PLUS ONE on removing amine blush with warm soapy water.

It took me a long time to learn this. The amine blush does not come off with other solvents. Sanding it mostly spreads it around. But...
Forum: RV General Discussion/News 09-29-2022, 01:06 PM
Replies: 7
Views: 860
Posted By scsmith
Yes, lately their online store has been closed....

Yes, lately their online store has been closed. But they are super nice to work with on the phone. They are always my first stop for NAS and other hard-to-find hardware.
Forum: Traditional Aircraft Engines 09-28-2022, 05:16 PM
Replies: 10
Views: 1,466
Posted By scsmith
Thanks for posting Clay, I'm curious, I don't...

Thanks for posting Clay,

I'm curious, I don't see much info on their website about what options for engines, other than just going through their build quote menus. They don't post hp numbers for...
Forum: RV-8/8A 09-28-2022, 01:31 PM
Replies: 10
Views: 1,074
Posted By scsmith
The inboard attach point uses standard AN bolts...

The inboard attach point uses standard AN bolts and nuts. Those are fine.
Forum: Propellers 09-27-2022, 03:17 PM
Replies: 48
Views: 5,399
Posted By scsmith
They might be pretty difficult to drive out once...

They might be pretty difficult to drive out once sheared. Perhaps you can grab the open end with needlenose pliers and twist/pull to pull each half out. It may take several different techniques in...
Forum: RV-8/8A 09-26-2022, 08:24 PM
Replies: 10
Views: 1,074
Posted By scsmith
Good points Karl. On the build-log that you...

Good points Karl.

On the build-log that you linked to for the little retainer clips, I do have a concern:
In his first photo of the normal, per-plans installation, the horrible NAS679 nuts are...
Forum: RV-8/8A 09-26-2022, 07:55 PM
Replies: 10
Views: 1,074
Posted By scsmith
On balance, I think it is better to have the...

On balance, I think it is better to have the bolts drop down from inside, if you can do it. As you say, there are a couple of AN3 nuts and bolt-tails in the way. During the build, if you can loosen...
Forum: RV General Discussion/News 09-25-2022, 10:36 PM
Replies: 23
Views: 3,486
Posted By scsmith
Montague Balloon Fest!

I flew over from Ashland to Montague in the pre-dawn to see the dawn ascension of balloons at the Montague Balloon Fest. There were eight balloons including the Smokey-the-Bear balloon from the US...
Forum: Primers 09-25-2022, 12:54 AM
Replies: 8
Views: 795
Posted By scsmith
And here is the link to the "other" Eastwood...

And here is the link to the "other" Eastwood aerosol can 2K primer that does not have the isocyanates, and uses humidity to activate the catalyst. ...
Forum: Primers 09-24-2022, 12:26 AM
Replies: 8
Views: 795
Posted By scsmith
2K primers

This is new to me. I kept seeing references to 2K primer so I thought I would go find out what it is. Eastwood is the brand I read about. I guess there is an older version where the catalyst is in...
Forum: RV-8/8A 09-22-2022, 12:57 PM
Replies: 10
Views: 1,022
Posted By scsmith
An additional complication is how you intend to...

An additional complication is how you intend to hold the cowl on. Whether you use piano hinge, or make attach strips that support the quarter-turn fasteners (mil-spec or skybolt), either one, plus...
Forum: Propellers 09-22-2022, 12:21 AM
Replies: 48
Views: 5,399
Posted By scsmith
Hmmm. I can attest that the roll pins are indeed...

Hmmm.

I can attest that the roll pins are indeed one piece and go all the way through. It sounds like apparently your pins have some kind of debris in the hole in the center of each one. Maybe...
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