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Search: Posts Made By: scsmith
Forum: California 10-18-2018, 11:02 AM
Replies: 4
Views: 211
Posted By scsmith
Attitude Aviation in Livermore

Attitude Aviation in Livermore
Forum: RV General Discussion/News 10-17-2018, 11:50 PM
Replies: 15
Views: 841
Posted By scsmith
PLUS 1 Until last year, I had agreed with Carl....

PLUS 1

Until last year, I had agreed with Carl. But then I tried the sleeves. Fantastic. High confidence in a solid joint, fast, easy, no muss, no fuss. I'm a convert.
Forum: RV General Discussion/News 10-15-2018, 09:19 PM
Replies: 15
Views: 1,037
Posted By scsmith
Just to clarify in case that was confusing for...

Just to clarify in case that was confusing for some, the torque is the hanging weight times the length of the wrench to the point where the string is tied plus the weight of the wrench itself times...
Forum: RV General Discussion/News 10-15-2018, 12:50 AM
Replies: 15
Views: 1,037
Posted By scsmith
Yes, that should do nicely. Make sure the...

Yes, that should do nicely. Make sure the pointer is on zero when unloaded, and make sure you apply pressure exactly at the intended spot. Most flex-beam torque wrenches have a handle that is free...
Forum: RV General Discussion/News 10-14-2018, 05:31 PM
Replies: 15
Views: 1,037
Posted By scsmith
I agree with Scott, with the fine tuning that you...

I agree with Scott, with the fine tuning that you would like to know the torque required while turning, not to just get it to start. That much I kind of agree with what Aluminum said. ...
Forum: Traditional Aircraft Engines 10-13-2018, 04:19 PM
Replies: 25
Views: 3,385
Posted By scsmith
I agree. Although your description doesn't...

I agree. Although your description doesn't specifically address wrist pin scuffing. But it is easy to imagine little bits of stuff getting lodged in the pocket at the wrist pin ends and scuffing...
Forum: Traditional Aircraft Engines 10-13-2018, 01:06 PM
Replies: 25
Views: 3,385
Posted By scsmith
Part of the original question....

scoring.

I have a question about wrist-pin scoring on cylinder walls. Can a small amount of light scoring from wrist pins be expected and normal? Or is it always a sign of an issue?
Forum: Traditional Aircraft Engines 10-12-2018, 09:17 PM
Replies: 25
Views: 3,385
Posted By scsmith
16 gph at 75% power? I don't think so.

16 gph at 75% power? I don't think so.
Forum: RV General Discussion/News 10-12-2018, 09:14 PM
Replies: 4
Views: 344
Posted By scsmith
OK, the RV-9A at Siskiyou....Dale Bush is the...

OK, the RV-9A at Siskiyou....Dale Bush is the owner. He will be at the airport on Saturday at noon, showing the RV-7 to a prospective buyer. He is happy to let you look at the RV-9A. You could...
Forum: Electrical Systems 10-12-2018, 06:22 PM
Replies: 7
Views: 390
Posted By scsmith
Wouldn't be easier and safer to install an inline...

Wouldn't be easier and safer to install an inline fuse holder?
Forum: RV General Discussion/News 10-12-2018, 06:19 PM
Replies: 4
Views: 344
Posted By scsmith
There is an RV-9A at Siskiyou Co. Airport, 45 s....

There is an RV-9A at Siskiyou Co. Airport, 45 s. mi. west of Klamath Falls, although it is quite a bit longer drive - no roads go direct. Google Maps says it is 82 road miles via US-97, county rd...
Forum: Traditional Aircraft Engines 10-07-2018, 09:01 PM
Replies: 25
Views: 3,385
Posted By scsmith
cooling baffles!

While you are puzzling over the engine, I think you should focus some attention on why your cylinders got so hot. I immediately suspect you have baffle leaks that you are not aware of. Have you...
Forum: RV General Discussion/News 10-03-2018, 10:44 PM
Replies: 27
Views: 2,851
Posted By scsmith
the article referenced by the home-page story...

the article referenced by the home-page story says, "In class E airspace, IFR traffic is controlled by ATC."

This begs the question, and forgive me, I'm not IFR rated -- but isn't IFR traffic ALWAYS...
Forum: RV General Discussion/News 10-03-2018, 10:15 PM
Replies: 27
Views: 2,851
Posted By scsmith
Not marked as a MOA on the Sectional. That is an...

Not marked as a MOA on the Sectional.

That is an odd thing indeed. Exactly 1 nm wide, and 25 nm long.

Maybe it is a designated Phase I test area for E-AB? I'm joking!!!!

The practical...
Forum: RV-14 10-02-2018, 11:50 PM
Replies: 11
Views: 982
Posted By scsmith
You mentioned putting the heated pitot tube in...

You mentioned putting the heated pitot tube in the first rib bay outboard of the wing-walk ribs. It sounds to me that location would be in the propwash.

It is hard to find a place to put a pitot...
Forum: RV General Discussion/News 09-30-2018, 09:43 AM
Replies: 10
Views: 580
Posted By scsmith
Thanks guys. I was asking for a friend who just...

Thanks guys. I was asking for a friend who just bought a nice -7 and the tires show very uneven wear. So I was just wondering.

We will do the measurements, but the expectation based on what you...
Forum: RV General Discussion/News 09-29-2018, 11:44 PM
Replies: 25
Views: 2,059
Posted By scsmith
Gil beat me to it. +1.

Gil beat me to it. +1.
Forum: RV General Discussion/News 09-29-2018, 11:39 PM
Replies: 10
Views: 580
Posted By scsmith
wheel alignment on RV-6,7,9

For the RV-8, it is possible to shim the attachment of the axle to the gear strut to adjust the wheel toe-in.

For an RV-7, or any of the the other round strut RVs, is there any way to adjust the...
Forum: Flight Testing 09-29-2018, 11:29 PM
Replies: 20
Views: 1,127
Posted By scsmith
You are more than welcome, I'm glad it turned out...

You are more than welcome, I'm glad it turned out so well too!
Forum: Flight Testing 09-29-2018, 11:21 PM
Replies: 20
Views: 1,127
Posted By scsmith
Yes, of course! Since induced drag is actually...

Yes, of course! Since induced drag is actually my area of specialization!

Thus listed in the assumptions a constant span efficiency, and why I listed the span and weight in the assumptions. In...
Forum: Flight Testing 09-29-2018, 05:30 PM
Replies: 20
Views: 1,127
Posted By scsmith
I just put together a quickie spreadsheet to...

I just put together a quickie spreadsheet to calculate top speed at various altitudes.

Assumptions:
Span=23 ft
Weight = 1550
Max power =180 Hp
prop efficiency 0.85 (constant)
span efficiency 0.95...
Forum: Flight Testing 09-29-2018, 04:47 PM
Replies: 20
Views: 1,127
Posted By scsmith
This logic would be correct except for two...

This logic would be correct except for two factors. First, as you change altitude, engine power changes in proportion to density. But Profile drag changes in proportion to the square root of the...
Forum: Flight Testing 09-29-2018, 04:29 PM
Replies: 20
Views: 1,127
Posted By scsmith
Well that's because he lived in Colorado, IIRC,...

Well that's because he lived in Colorado, IIRC, so he couldn't test much lower than that even if he wanted to. Does not address what altitude to get the best TAS.
Forum: RV-8/8A 09-28-2018, 06:19 PM
Replies: 10
Views: 1,379
Posted By scsmith
Mine also cruises with no trim, although it is...

Mine also cruises with no trim, although it is just a thin fraction of a ball off. Built to plans. Just the slight weight of my relaxed right foot is enough to keep it perfect. I also found that...
Forum: RV General Discussion/News 09-26-2018, 06:24 PM
Replies: 6
Views: 409
Posted By scsmith
I find this ironic. The only spinner I have ever...

I find this ironic. The only spinner I have ever seen crack at the prop blade cut out was flanged. The flange also adds drag.
Forum: RV-9/9A 09-20-2018, 10:12 AM
Replies: 8
Views: 1,260
Posted By scsmith
I agree! When I had a Citabria, lots of my...

I agree!

When I had a Citabria, lots of my tailwheel friends would kind of scoff and say that it almost didn't count as tailwheel.
Forum: RV General Discussion/News 09-19-2018, 06:37 PM
Replies: 39
Views: 4,706
Posted By scsmith
Andy's prop looked a fair bit smaller in diameter...

Andy's prop looked a fair bit smaller in diameter than Jeff's or Bob Mills'. I assumed the smaller prop allowed higher RPM without transonic tip losses.
Forum: RV General Discussion/News 09-17-2018, 09:41 PM
Replies: 9
Views: 657
Posted By scsmith
Permatex "high tack" or Permatex "Aviation...

Permatex "high tack" or Permatex "Aviation Form-a-gasket" Neither one has ever let me down on exactly this type of application. It is what I have on my RV-8 tank access covers, AND using the...
Forum: Traditional Aircraft Engines 09-11-2018, 12:12 AM
Replies: 19
Views: 2,253
Posted By scsmith
Well, that's true, I don't get afterfires. What...

Well, that's true, I don't get afterfires. What I get is a very rough-running engine. But you are right, I don't get pops and bangs. As you pointed out, with one ignition, it will still burn, it's...
Forum: Traditional Aircraft Engines 09-10-2018, 10:01 PM
Replies: 19
Views: 2,253
Posted By scsmith
Sure, if you are ROP. Try it 60° LOP and see...

Sure, if you are ROP.

Try it 60° LOP and see what happens
Forum: Traditional Aircraft Engines 09-10-2018, 10:00 PM
Replies: 19
Views: 2,253
Posted By scsmith
No doubt this is true ROP. If you are very LOP,...

No doubt this is true ROP. If you are very LOP, not so true at all.
Forum: Primers 09-09-2018, 12:49 AM
Replies: 23
Views: 1,531
Posted By scsmith
It does? Are you sure?

It does? Are you sure?
Forum: Traditional Aircraft Engines 09-09-2018, 12:41 AM
Replies: 19
Views: 2,253
Posted By scsmith
If your mag plugs are fouled badly, you get a...

If your mag plugs are fouled badly, you get a partial misfire even though the LSE plug is firing and lighting the mixture. This is related to an extensive thread on ignition advance and multi-plug...
Forum: RV Ongoing Maintenance Issues 09-08-2018, 11:51 PM
Replies: 14
Views: 1,607
Posted By scsmith
Whats more, if you fill with air, and they lose...

Whats more, if you fill with air, and they lose pressure, presumably because the O2 molecules are smaller and they leak out, leaving behind mostly N2, then you refill with air, and again most of the...
Forum: Primers 09-06-2018, 09:19 PM
Replies: 23
Views: 1,531
Posted By scsmith
Bravo! I hope everyone follows your lead. Good...

Bravo! I hope everyone follows your lead.
Good idea to let the water evaporate and create a concentrated, smaller volume. No point paying the hazmat folks to dispose of water.
Forum: Primers 09-06-2018, 07:46 PM
Replies: 23
Views: 1,531
Posted By scsmith
Please just dispose of the used Alodine at a...

Please just dispose of the used Alodine at a household hazardous waste site. Don't dump it down the drain or pour it on the ground. It contains hexavalent chromium, which is right up there with...
Forum: RV-8/8A 09-04-2018, 06:05 PM
Replies: 23
Views: 3,439
Posted By scsmith
If I ever build another one, I will do this for...

If I ever build another one, I will do this for sure. The only reason I didn't do it on mine is that that it was a QB and all those bolts were in, and they prevent the head of the bolt from dropping...
Forum: RV General Discussion/News 09-04-2018, 05:59 PM
Replies: 27
Views: 2,893
Posted By scsmith
+2 on Bavafa's suggestion to try prying forward...

+2 on Bavafa's suggestion to try prying forward on the tank, gently. Yes, this is worth a try. My hunch would be that the stripped threads will not want to allow a clean thread to get started...
Forum: RV General Discussion/News 09-02-2018, 01:06 AM
Replies: 27
Views: 2,893
Posted By scsmith
It seems to me there are two possibilities...

It seems to me there are two possibilities here.

One is that the plate nut is spinning, presumably because it wasn't riveted properly to the Z-bracket, or it was overtorqued and that broke the...
Forum: RV General Discussion/News 08-30-2018, 10:22 PM
Replies: 5
Views: 1,572
Posted By scsmith
Very Cool! I often remark to friends that "you...

Very Cool!

I often remark to friends that "you never know what your own airplane sounds like".

So fun to find out!
Forum: RV General Discussion/News 08-29-2018, 12:18 PM
Replies: 19
Views: 2,495
Posted By scsmith
What causes the perception of a heavy wing is an...

What causes the perception of a heavy wing is an asymmetry in the natural float position of the ailerons. When you fly hands-off, the ailerons seek a compromise position between where the two...
Forum: RV General Discussion/News 08-26-2018, 11:30 AM
Replies: 19
Views: 2,495
Posted By scsmith
All the comments here are good. It should be...

All the comments here are good. It should be emphasized to check the vertical position of the aileron relative to the wing surface. Lay a straight edge on the wing over the last few inches before...
Forum: Fuel Injection Systems 08-25-2018, 11:32 PM
Replies: 104
Views: 14,760
Posted By scsmith
What about the issue that the re-welded pipe is...

What about the issue that the re-welded pipe is now shorter by roughly the bandsaw kerf width? Assuming you bandsaw cut it, then reassemble by putting the two pieces together, it is now shorter by,...
Forum: Fuel Injection Systems 08-24-2018, 11:46 AM
Replies: 104
Views: 14,760
Posted By scsmith
I am a little bit concerned about the cut and...

I am a little bit concerned about the cut and re-weld operation. Perhaps some of you that have done that can reassure me.

On the engines with the rubber sleeve connection of the induction tube to...
Forum: RV Ongoing Maintenance Issues 08-23-2018, 06:31 PM
Replies: 32
Views: 4,671
Posted By scsmith
REI has boe-lube? I would never have guessed...

REI has boe-lube? I would never have guessed that.
Forum: Fiberglass 08-10-2018, 10:03 AM
Replies: 11
Views: 1,485
Posted By scsmith
Yes it is true that Shell Epon is the base stock...

Yes it is true that Shell Epon is the base stock that most all formulators use to make their epoxy. I think Epon 828 is the straight base stock. Most of the other Epon numbers are different...
Forum: Fiberglass 08-08-2018, 07:42 PM
Replies: 11
Views: 1,485
Posted By scsmith
Better to just avoid West Systems epoxy...

Better to just avoid West Systems epoxy altogether and use better epoxy for less money.

We recommend the Jeffco 1307 resin. ACS has it at a good price. A one-gallon 'kit' is $87, includes both resin...
Forum: Traditional Aircraft Engines 08-07-2018, 07:58 PM
Replies: 37
Views: 3,246
Posted By scsmith
And then, when the airplane did go down to sea...

And then, when the airplane did go down to sea level, it would be too lean. The potential consequences of that outweigh any argument for not manually leaning at the home field.
Forum: Trip Write-ups 08-01-2018, 09:59 PM
Replies: 35
Views: 5,761
Posted By scsmith
Wow, congrats, Caleb, on successfully making the...

Wow, congrats, Caleb, on successfully making the conversion from the Subie to the Lycoming with SDS, and fulfilling your dream. Great pictures. But mostly, you are one lucky dude for finding...
Forum: RV General Discussion/News 08-01-2018, 02:36 AM
Replies: 6
Views: 865
Posted By scsmith
Walter Vincenti's book is indeed fantastic. A...

Walter Vincenti's book is indeed fantastic. A primary tenant of the book is that Engineering is a unique discipline in itself, not simply applied science. The individual chapters in the book are...
Forum: RV General Discussion/News 07-30-2018, 11:24 AM
Replies: 17
Views: 1,583
Posted By scsmith
I emailed the Airgizmos guys and they just sent...

I emailed the Airgizmos guys and they just sent me the overhaul kit for the gust lock. It includes new webbing and a new cam lock.

Stand-up guys! I really appreciate it.

They mentioned that old...
Forum: COMM 07-29-2018, 01:16 AM
Replies: 10
Views: 860
Posted By scsmith
Perhaps a case for shielded wire? At least to...

Perhaps a case for shielded wire? At least to the buzzer.

I just went ahead and used shielded wire for all mic and phone jacks. All shields grounded at the radio (IIRC)
Forum: Traditional Aircraft Engines 07-17-2018, 09:57 AM
Replies: 20
Views: 3,058
Posted By scsmith
A quart in 4 or 5 hrs from a gasket leak? Wow,...

A quart in 4 or 5 hrs from a gasket leak? Wow, that is a big leak!
Forum: RV Photo/Video URLs 07-15-2018, 01:20 AM
Replies: 2
Views: 953
Posted By scsmith
You have V.G.s on your wings. There really is a...

You have V.G.s on your wings.

There really is a place called Concrete ?!?
Forum: RV General Discussion/News 07-01-2018, 11:36 PM
Replies: 15
Views: 2,038
Posted By scsmith
I'm inclined to agree. The one test I did with a...

I'm inclined to agree. The one test I did with a soft "A" rivet showed a shear strength about 60--65% of a "AD" rivet.
Forum: RV General Discussion/News 07-01-2018, 09:03 PM
Replies: 15
Views: 2,038
Posted By scsmith
In the photo of the AN470 rivet, the rivet...

In the photo of the AN470 rivet, the rivet pictured has no dimple in the head. I think this means it is a soft AN470A3 rivet, rather than the higher strength AN470AD3 rivet, which would be...
Forum: Trip Write-ups 06-30-2018, 11:11 AM
Replies: 48
Views: 15,541
Posted By scsmith
Vlad saves humanity by discovering that the Borg...

Vlad saves humanity by discovering that the Borg has assimilated the Aleutians. Resistance apparently was not futile.

A local taxidermist was called to preserve the evidence.
Forum: Trip Write-ups 06-29-2018, 12:43 PM
Replies: 48
Views: 15,541
Posted By scsmith
Vlad! I'm turning blue with suspense. Did you...

Vlad!
I'm turning blue with suspense. Did you make Dutch Harbor? Pictures?
Forum: RV General Discussion/News 06-26-2018, 11:24 PM
Replies: 35
Views: 4,538
Posted By scsmith
This seems to be at odds with a previous Mike...

This seems to be at odds with a previous Mike Busch article I recall where the topic was if you had one bad cylinder should you replace all of them. He argued strongly that no you shouldn't, just...
Forum: RV General Discussion/News 06-25-2018, 03:41 PM
Replies: 7
Views: 896
Posted By scsmith
You will find zero performance penalty from...

You will find zero performance penalty from reshaping an area of the cowl with some kind of bulge, as long as the contours are smooth and don't create any aft-facing slopes.

In other words, as...
Forum: Northwest 06-25-2018, 09:05 AM
Replies: 8
Views: 627
Posted By scsmith
Neil Wischer might be able to help. I think he...

Neil Wischer might be able to help. I think he lives in Coulee City, which is a ways away, but he may know someone. I'll see if I have some contact info on him.
Forum: My RV Build Project 06-24-2018, 05:43 PM
Replies: 3
Views: 881
Posted By scsmith
Call Bob Kuykendall

HI James,
Bob Kuykendall, owner of HP-Aircraft LLC in Arnold, CA, works in the Bay Area during the week. He has good skills in both sheet metal and composites, and is an EAA Tech Counselor. He...
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