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Search: Posts Made By: scsmith
Forum: California Today, 12:45 AM
Replies: 3
Views: 147
Posted By scsmith
On the way in, work with Travis Approach and they...

On the way in, work with Travis Approach and they will hand you off to the tower.
Years ago, I used to park at the Sheraton. I guess it is the Crowne Plaza now. If you will be there during normal...
Forum: RV General Discussion/News 04-02-2021, 06:09 PM
Replies: 5
Views: 556
Posted By scsmith
Wet sand with water

Wet sand with water
Forum: California 04-02-2021, 12:20 PM
Replies: 21
Views: 961
Posted By scsmith
Half Moon Bay has several restaurants just a...

Half Moon Bay has several restaurants just a short walk into Princeton By the Sea, off the south end of the runway. Mezza Luna, Half Moon Bay Brewing Company, and a crab shack among them.

Petaluma...
Forum: RV General Discussion/News 04-01-2021, 04:22 PM
Replies: 5
Views: 556
Posted By scsmith
Canopy restoration

I just spent two afternoons rehabilitating the canopy on my old LS6 sailplane. The canopy is 28 years old and has been poorly cared for. It was so scratched up with fine scratches and swirl marks...
Forum: Fiberglass 03-29-2021, 11:46 AM
Replies: 7
Views: 953
Posted By scsmith
One feature that will often yield a lighter part...

One feature that will often yield a lighter part in carbon is to not match the full properties of the aluminum part. Often the aluminum part is built with minimum gauge constraints that make it...
Forum: RV-8/8A 03-29-2021, 10:53 AM
Replies: 10
Views: 944
Posted By scsmith
Plus one on making a stainless steel ramp. Carl...

Plus one on making a stainless steel ramp. Carl meant 0.015”.

As a datapoint, I have a vetterman crossover exhaust with downturns.( or should I say turn-downs? ;) ) I pop-riveted external...
Forum: RV General Discussion/News 03-29-2021, 10:36 AM
Replies: 59
Views: 3,095
Posted By scsmith
Iím really glad everyone is taking this in the...

Iím really glad everyone is taking this in the spirit intended
Forum: RV General Discussion/News 03-29-2021, 10:35 AM
Replies: 59
Views: 3,095
Posted By scsmith
Ive always found that terminology strange as well...

Ive always found that terminology strange as well but isnít that the preferred/expected terminology? Maybe a question for Ed Wischmeier (apologies if I misspell his name)
Forum: RV General Discussion/News 03-28-2021, 09:36 PM
Replies: 59
Views: 3,095
Posted By scsmith
nutplate vs plate nut

I really hate to be a nag, but the proper name for a blind anchor nut is a "plate nut". They are nuts. They happen to be formed so that they can be riveted onto a plate. The "official" GSA...
Forum: RV Building Tips/Techniques 03-28-2021, 08:40 PM
Replies: 19
Views: 1,192
Posted By scsmith
I really hate to be a nag, but the proper name...

I really hate to be a nag, but the proper name for a blind anchor nut is a "plate nut". They are nuts. They happen to be formed so that they can be riveted onto a plate. The "official" GSA...
Forum: RV Ongoing Maintenance Issues 03-22-2021, 08:16 PM
Replies: 26
Views: 1,822
Posted By scsmith
The threaded fitting is not very long - it only...

The threaded fitting is not very long - it only goes a short distance up into the filter before it meets up with the perforated tube that runs to the end of the filter, right? So you are correct,...
Forum: RV Ongoing Maintenance Issues 03-22-2021, 06:13 PM
Replies: 26
Views: 1,822
Posted By scsmith
I don't understand this. I am talking about next...

I don't understand this. I am talking about next time I change my oil (dirty oil) I will pull the filter without draining it and see if the level of metal is different. I typically get a little...
Forum: RV Ongoing Maintenance Issues 03-22-2021, 06:07 PM
Replies: 26
Views: 1,822
Posted By scsmith
Yes, I have occasionally wondered about that. ...

Yes, I have occasionally wondered about that. Maybe not every oil change, but once in a while, it would seem like a good idea to drain the cooler.
Forum: RV Ongoing Maintenance Issues 03-22-2021, 06:06 PM
Replies: 26
Views: 1,822
Posted By scsmith
I don't understand why you say this. My filter...

I don't understand why you say this. My filter sits up almost vertical, with the mounting face at the bottom. It is not uphill to anything for the oil in the center area of the filter to drain down...
Forum: RV Ongoing Maintenance Issues 03-22-2021, 01:37 PM
Replies: 26
Views: 1,822
Posted By scsmith
The VAST majority of the drain-back oil is from...

The VAST majority of the drain-back oil is from inside the filter element, so it has already been filtered. The small volume of oil around the outside of the filter element drains back through one...
Forum: Propellers 03-18-2021, 12:42 PM
Replies: 16
Views: 1,054
Posted By scsmith
I don't know about 'most'. Some models do. Some...

I don't know about 'most'. Some models do. Some models don't. Mine does not.
Forum: RV Ongoing Maintenance Issues 03-18-2021, 01:08 AM
Replies: 26
Views: 1,822
Posted By scsmith
My accessory case is my catch pan. The very first...

My accessory case is my catch pan. The very first step I do for an oil change is that I take a drift punch and put a hole in the top of the oil filter. Then I set up to drain the oil sump, take my...
Forum: Alternative Engines 03-17-2021, 09:36 PM
Replies: 58
Views: 6,818
Posted By scsmith
This is true! There is a technical paper that...

This is true! There is a technical paper that recounts the history of the R-2800 development, which boiled down to running it on a stand until the crank broke, then trying something else, repeat,...
Forum: RV-8/8A 03-16-2021, 01:02 PM
Replies: 19
Views: 2,382
Posted By scsmith
And yet, it is amazing how often I see airplanes...

And yet, it is amazing how often I see airplanes that 'got away with it'.
Forum: Propellers 03-13-2021, 06:47 PM
Replies: 16
Views: 1,054
Posted By scsmith
I'm not sure if the info I can share is...

I'm not sure if the info I can share is applicable or not.

I have a angle-valve IO-360, so 8.7 compression. (not too different from 9:1)
I also have one Light Speed ignition that runs fairly...
Forum: Traditional Aircraft Engines 03-08-2021, 06:10 PM
Replies: 211
Views: 44,712
Posted By scsmith
True, but you don't expect to see bearings wiped...

True, but you don't expect to see bearings wiped on a fresh engine. Something wasn't right.
Forum: RV-4 03-06-2021, 11:54 AM
Replies: 10
Views: 824
Posted By scsmith
When I originally fit my PR wheel fairings, I fit...

When I originally fit my PR wheel fairings, I fit them to 500-5 tires, but anticipated going to the 380-150x5 later, so I set the wheel fairing a little high. I didn't note the actual height in my...
Forum: RV-8/8A 03-04-2021, 07:36 PM
Replies: 22
Views: 2,244
Posted By scsmith
The gear tower mod is something you do yourself -...

The gear tower mod is something you do yourself - not a kit someone sells. You can search the forum and find lots of pictures, and discussion -- a few different variations.

IIRC the showplanes...
Forum: Fuel Injection Systems 03-04-2021, 04:33 PM
Replies: 90
Views: 7,301
Posted By scsmith
Thanks, this is helpful. I rarely get enough...

Thanks, this is helpful. I rarely get enough heat soak to have a prolonged rough running. Usually a quick run-up clears it. Once in a while when it is really hot, it coughs and barks until take-off...
Forum: Fiberglass 03-04-2021, 11:32 AM
Replies: 21
Views: 2,448
Posted By scsmith
Let us know how the flange and valve body fit...

Let us know how the flange and valve body fit together. I assumed they were the same diameter, not one a slip fit over the other. But I am curious.

You could trim the butterfly valve tube back...
Forum: Fuel Injection Systems 03-04-2021, 11:25 AM
Replies: 90
Views: 7,301
Posted By scsmith
I am curious how and to what degree a purge valve...

I am curious how and to what degree a purge valve helps hot starting on a mechanical FI. My hypothesis has always been that fuel boiling occurs in the fine stainless steel 'spider' lines that run...
Forum: Fiberglass 03-04-2021, 10:54 AM
Replies: 21
Views: 2,448
Posted By scsmith
Larry, If you have a parallel valve engine...

Larry, If you have a parallel valve engine without piston oil squirters, then Jereme is probably right. If you do a good job with the cooler air supply, you will probably have way too much cooling. ...
Forum: Fuel Injection Systems 03-04-2021, 12:04 AM
Replies: 90
Views: 7,301
Posted By scsmith
My experience with a Bendix RSA-5 and balanced...

My experience with a Bendix RSA-5 and balanced injectors is that this statement is not true. I have essentially zero GAMI spread over a reasonable range of RPM and MAP. The balance does not "fall...
Forum: Fiberglass 03-03-2021, 10:44 PM
Replies: 21
Views: 2,448
Posted By scsmith
Larry, My concern for the shutters is that when...

Larry,

My concern for the shutters is that when 'wide open' they still present a fairly significant obstruction to the flow into the cooler. For the parallel-valve 360 engines this seems to be fine...
Forum: Fiberglass 03-03-2021, 09:13 PM
Replies: 21
Views: 2,448
Posted By scsmith
You would like to keep the diffusion angles...

You would like to keep the diffusion angles shallow and the shape smooth. Brian Decker's is a very good shape.

The Anti-splat is much too abrupt a diffuser with sharp corners and big angle change....
Forum: RV General Discussion/News 03-03-2021, 11:34 AM
Replies: 38
Views: 4,530
Posted By scsmith
Wednesday was a beautiful spring day in southern...

Wednesday was a beautiful spring day in southern Oregon. We flew over to Gold Beach, had lunch, walked to the local fish market and picked up some very fresh crab to bring home for dinner.

Sunday...
Forum: RV General Discussion/News 03-03-2021, 10:16 AM
Replies: 12
Views: 1,207
Posted By scsmith
Yes, we all understand that shipping seems to...

Yes, we all understand that shipping seems to have been disrupted by the pandemic -- not sure why that would be? Maybe greater shipping volume and less in-person shopping?

Anyway, the primary point...
Forum: RV General Discussion/News 03-02-2021, 07:23 PM
Replies: 12
Views: 1,207
Posted By scsmith
ACS shipping and service

Usually when I order hardware from ACS, it comes from the store in Corona, CA, and it takes just two days with regular UPS Ground shipping.

My last order was drop-shipped from a secondary supplier...
Forum: Traditional Aircraft Engines 03-02-2021, 07:19 PM
Replies: 22
Views: 2,249
Posted By scsmith
Oops, yes, thank you. I seem to be having...

Oops, yes, thank you. I seem to be having trouble with my "n" key today. Either that, or some spell checker did an auto-corrupt.
Forum: Traditional Aircraft Engines 03-02-2021, 11:15 AM
Replies: 22
Views: 2,249
Posted By scsmith
O-ring elbow fittings have a glad nut for the...

O-ring elbow fittings have a glad nut for the O-ring compression. You install the fitting, orient it however you wish, and then tighten the glad nut, which compresses the O-ring as designed, and...
Forum: RV Building Tips/Techniques 03-01-2021, 12:21 PM
Replies: 7
Views: 599
Posted By scsmith
Sorry, but that is not true. Age hardening takes...

Sorry, but that is not true. Age hardening takes place over time as the hardening element precipitates out of a metastable crystal matrix.

Work hardening happens during the deformation process, as...
Forum: RV Building Tips/Techniques 02-28-2021, 01:51 PM
Replies: 7
Views: 527
Posted By scsmith
Good advise. Thanks for documenting what many of...

Good advise. Thanks for documenting what many of us learn the hard way.

I think most of the time I went 1/16", 1/8", then used the Unibit.
Forum: Propellers 02-24-2021, 07:37 PM
Replies: 24
Views: 2,984
Posted By scsmith
The IO-360-A1A is not. The IO-360-A3B6 is.

The IO-360-A1A is not. The IO-360-A3B6 is.
Forum: Safety 02-21-2021, 07:52 PM
Replies: 47
Views: 4,462
Posted By scsmith
That's interesting Skylor. This suggests there...

That's interesting Skylor. This suggests there is a check-valve feature in the governor that prevents or restricts bleed back of the oil pressure.

My old MT governor gave control to very low RPM,...
Forum: RV General Discussion/News 02-21-2021, 07:44 PM
Replies: 62
Views: 5,032
Posted By scsmith
I will do my darnedest to make it to OSh this...

I will do my darnedest to make it to OSh this year... My first year. And yes, assuming I make it, I will be there for the social.

I get my second shot in two weeks.
Forum: Safety 02-21-2021, 12:36 PM
Replies: 47
Views: 4,462
Posted By scsmith
For a given pitch setting, the prop will spin...

For a given pitch setting, the prop will spin fastest when no work is being extracted from it. Any braking torque from turning the dead engine will slow the prop down. So your observation of the...
Forum: Safety 02-20-2021, 01:44 PM
Replies: 47
Views: 4,462
Posted By scsmith
Interesting. OK. I was wrong.

Interesting. OK. I was wrong.
Forum: RV General Discussion/News 02-19-2021, 03:03 PM
Replies: 20
Views: 1,738
Posted By scsmith
It is interesting that you point this out. Aero...

It is interesting that you point this out. Aero and propulsion folks that work in the Imperial units system (ft, lb_f, sec) cling to that unit system with the 'excuse' that we have more intuition...
Forum: RV General Discussion/News 02-19-2021, 01:08 PM
Replies: 20
Views: 1,738
Posted By scsmith
Because the atmosphere is so thin, you can not...

Because the atmosphere is so thin, you can not get gentle descent rates with parachutes alone. well, reasonably sized ones anyway.
The early rovers dropped onto the surface inside a beach ball. When...
Forum: RV General Discussion/News 02-19-2021, 01:47 AM
Replies: 20
Views: 1,738
Posted By scsmith
More about ARES

I know this is pretty far from RV related, so if a moderator wants to take it down, I would understand. But I think people would find it interesting.

If you want to learn more about the ARES Mars...
Forum: RV-7/7A 02-19-2021, 01:05 AM
Replies: 20
Views: 2,365
Posted By scsmith
Gun ports

Spitfires used to tape over the gun ports in the leading edge with red tape.

Back to the issue at hand, the only whistle or buzz I have had is when the rubber seal on the wing root fairing has had...
Forum: RV General Discussion/News 02-18-2021, 07:27 PM
Replies: 20
Views: 1,738
Posted By scsmith
YAY!

I worked on a very early Mars airplane design activity, and then worked on the ARES Mars airplane, a project led from NASA Langley in 2003-2004, in competition for the 2007 Mars Scout mission. We...
Forum: Fuel Injection Systems 02-16-2021, 04:55 PM
Replies: 25
Views: 3,801
Posted By scsmith
DanH's idea is to reduce the internal volume as...

DanH's idea is to reduce the internal volume as much as possible. Just changing the ends doesn't do it. Even if the -2 line is pricey, a bunch of us might happily pay it to avoid this cloud hanging...
Forum: RV General Discussion/News 02-16-2021, 04:45 PM
Replies: 21
Views: 1,866
Posted By scsmith
Alaska Airlines flies into Medford, Oregon. Any...

Alaska Airlines flies into Medford, Oregon. Any time you like, when the weather is good. I'll pick you up at Millionaire FBO. I'm assuming you work for Alaska? If so, you could even do it during a...
Forum: RV General Discussion/News 02-16-2021, 04:43 PM
Replies: 21
Views: 1,866
Posted By scsmith
Especially since he lives in Alaska!

Especially since he lives in Alaska!
Forum: Safety 02-13-2021, 07:02 PM
Replies: 47
Views: 4,462
Posted By scsmith
The zero-thrust glide data is of great academic...

The zero-thrust glide data is of great academic interest for evaluating the aerodynamic performance of the airframe.

But it is not at all useful for determining engine-out glide ratio, or best...
Forum: Safety 02-13-2021, 06:58 PM
Replies: 47
Views: 4,462
Posted By scsmith
Hmmm. Remember we are talking about a dead...

Hmmm. Remember we are talking about a dead engine -- ignition off.

On an idealized p-V diagram, regardless of throttle position, the compression and power strokes absorb no net work. Just an...
Forum: Tools 02-13-2021, 01:08 PM
Replies: 11
Views: 553
Posted By scsmith
Are you asking about manual pullers or pneumatic...

Are you asking about manual pullers or pneumatic pullers?

I would think if you are going to build an RV-12, you will be well-advised to get a pneumatic puller. They vary significantly in price and...
Forum: Aircraft Camping 02-13-2021, 01:02 PM
Replies: 13
Views: 1,756
Posted By scsmith
In my ongoing attempts to keep the record...

In my ongoing attempts to keep the record straight, the dry lakebed is officially known as Flannigan Dry Lake.



I would think that spraying ACF-50 would be a disaster, just an oily coating that...
Forum: RV General Discussion/News 02-12-2021, 02:17 PM
Replies: 6
Views: 648
Posted By scsmith
Here you...

Here you go.

https://arc.aiaa.org/doi/pdf/10.2514/3.45828

Looks like it costs $25 for permanent access to the pdf. In the old days, you would get a paper "pre-print" for that price.
Forum: Safety 02-11-2021, 07:00 PM
Replies: 47
Views: 4,462
Posted By scsmith
This would be true if you had an electric power...

This would be true if you had an electric power plant that added no additional windmill drag. But the added windmill drag will result in a best power-off glide speed a fair bit slower than the...
Forum: RV-8/8A 02-10-2021, 07:22 PM
Replies: 12
Views: 1,671
Posted By scsmith
This was going to be my recommendation for an...

This was going to be my recommendation for an improvement. I think regardless of exhaust, there is a tendency for that panel to oil-can. Even more so on the RV-7, I've seen it.
Forum: Safety 02-10-2021, 11:00 AM
Replies: 47
Views: 4,462
Posted By scsmith
Skylor, It is true that for minimum altitude loss...

Skylor,
It is true that for minimum altitude loss in a turn, you should fly at minimum sink speed for that loading (W/cos B), rather than best L/D speed. But at the elevated loading, the polar...
Forum: RV General Discussion/News 02-10-2021, 12:20 AM
Replies: 21
Views: 2,128
Posted By scsmith
AGAIN...I quoted directly from the article: it...

AGAIN...I quoted directly from the article:
it says "A crossover exhaust joins the headers of cylinders whose firings occur 180 crankshaft degrees apart. " which is incorrect.
Forum: Safety 02-09-2021, 04:46 PM
Replies: 47
Views: 4,462
Posted By scsmith
Bob, with the throttle open, the intake strokes...

Bob,
with the throttle open, the intake strokes pull a lot of air in, and the exhaust strokes pump a lot of air out. That is doing a lot of work, which the engine absorbs from the prop. With the...
Forum: Safety 02-09-2021, 12:51 PM
Replies: 47
Views: 4,462
Posted By scsmith
I did 360-degree turns starting at 2000 ft over...

I did 360-degree turns starting at 2000 ft over mid-field of a long runway, at idle power (gives 600 RPM on the ground, obviously higher in flight). Unable to adjust c/s pitch at low RPM with my...
Forum: Traditional Aircraft Engines 02-09-2021, 11:42 AM
Replies: 23
Views: 1,350
Posted By scsmith
The angle-valve engines are 8.7 CR, which...

The angle-valve engines are 8.7 CR, which definitely aggravates detonation. IO-360A engines were data-plate timed at either 20 or 25 BTDC depending on installation. I run mine at 25, operating from...
Forum: Traditional Aircraft Engines 02-08-2021, 08:54 PM
Replies: 23
Views: 1,350
Posted By scsmith
For those that are following along, what DanH...

For those that are following along, what DanH means is that the 28" MAP data does not go lean enough to show a peak EGT, but it is 'suggested' where that peak is. So you can see where the detonation...
Forum: Traditional Aircraft Engines 02-08-2021, 12:03 PM
Replies: 23
Views: 1,350
Posted By scsmith
DanH, This performance chart is for "worst case"...

DanH, This performance chart is for "worst case" in most respects, but only 26" MAP. What does the detonation margin look like at 30" MAP?
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