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Search: Posts Made By: Aluminum
Forum: RV General Discussion/News Today, 11:03 AM
Replies: 286
Views: 91,042
Posted By Aluminum
Well, since you are going with cheap untested...

Well, since you are going with cheap untested chinese flashlights as essential equipment in a $100k aircraft, nothing less than Arduino with custom code to synchronize with yaw damper will do for...
Forum: Glass Cockpit Today, 10:48 AM
Replies: 13
Views: 340
Posted By Aluminum
Walt, if not too much to ask, can you provide...

Walt, if not too much to ask, can you provide link to the dimmer unit you use?

Can any of the Garmin equipment be configured to be a dimmer "master", i.e. to provide voltage output from the...
Forum: RV General Discussion/News Yesterday, 10:54 AM
Replies: 286
Views: 91,042
Posted By Aluminum
170 F is balmy. Junction temperature is higher...

170 F is balmy. Junction temperature is higher and more difficult to measure. Nominal life is quoted at some junction temperature near 250 F. Much higher temperature can be tolerated given the < 100...
Forum: RV Building Tips/Techniques 04-24-2018, 11:46 AM
Replies: 28
Views: 1,462
Posted By Aluminum
Noted. My point is, you'll be looking at the...

Noted. My point is, you'll be looking at the wrinkled low gloss icky texture surface of vinyl every time you fly. Few people would put vinyl wrap in a car that costs a third of what a new RV build...
Forum: RV Building Tips/Techniques 04-24-2018, 11:17 AM
Replies: 28
Views: 1,462
Posted By Aluminum
It does, even under dzus and camlocs. I used the...

It does, even under dzus and camlocs. I used the "good stuff" from 3M, it looks like cr*p after four years in the hangar. I can't recommend it. Glad I didn't do the whole airplane. It's fine for...
Forum: RV Building Tips/Techniques 04-24-2018, 11:12 AM
Replies: 54
Views: 51,058
Posted By Aluminum
Take a look at "engineered siloxane" resins such...

Take a look at "engineered siloxane" resins such as PPG PSX 700 (https://www.cgedwards.com/ameron/PSX%20700SG%20Whitepaper%20Final.pdf) or Sherwin Williams XLE-80...
Forum: RV General Discussion/News 04-22-2018, 09:10 AM
Replies: 20
Views: 994
Posted By Aluminum
That's the whole point of paint prep, innit?...

That's the whole point of paint prep, innit? :eek: It's the phosphates in it that react with aluminum, but the rate is negligible compared to the abrasion of ScotchBrite. If you desire extra...
Forum: RV General Discussion/News 04-21-2018, 09:19 PM
Replies: 20
Views: 994
Posted By Aluminum
Are you sure you removed the transparent...

Are you sure you removed the transparent protective plastic film? :D

Epoxy primer has excellent adhesion to many substrates, but you do need to remove any oils and water (dessicant before spray gun...
Forum: Safety 04-19-2018, 08:53 AM
Replies: 49
Views: 4,492
Posted By Aluminum
H'm, now that you've planted the seeds of doubt,...

H'm, now that you've planted the seeds of doubt, I think I'll buy another switch and cut it apart to study.

I can confirm that pushing the key in does not make contact.

FWIW, this design didn't...
Forum: RV Building Tips/Techniques 04-19-2018, 08:31 AM
Replies: 28
Views: 1,462
Posted By Aluminum
Another vote for paint over powder coat...

Another vote for paint over powder coat here.

Or, you can do what I did and simply use black-anodized .063 Al sheet for panel and engrave or laser-etch through the anodized layer. The anodization is...
Forum: Safety 04-18-2018, 11:07 PM
Replies: 49
Views: 4,492
Posted By Aluminum
A quick googling for "stuck starter solenoid"...

A quick googling for "stuck starter solenoid" shows how ridiculous this statement is. Several such events have been described here at VAF over the years. Battery switches, on the other hand, are...
Forum: Safety 04-17-2018, 02:00 PM
Replies: 49
Views: 4,492
Posted By Aluminum
Agreed, nothing cures all, even staying on the...

Agreed, nothing cures all, even staying on the couch. :p



My configuration also solves the fused-starter-relay situation, which is fairly common as that contact breaks a couple of hundred amps...
Forum: Safety 04-17-2018, 01:54 PM
Replies: 49
Views: 4,492
Posted By Aluminum
Correct, the battery is next to the switch in...

Correct, the battery is next to the switch in this install. For behind-the-seat batteries the switch could be recessed between the seats.
Forum: Safety 04-17-2018, 08:50 AM
Replies: 49
Views: 4,492
Posted By Aluminum
Correct, the battery is about six inches away....

Correct, the battery is about six inches away. Only the thick zero gauge cable going from it to the switch. The switch is rated to pass 1000 amps for half a minute. It will disconnect a short very...
Forum: Safety 04-16-2018, 09:24 PM
Replies: 49
Views: 4,492
Posted By Aluminum
The standard master relay circuit design still...

The standard master relay circuit design still baffles me. As in, who in their right mind could have come up with such a failure-prone design in the 1950s, and why does it endure. I did different on...
Forum: RV-14 04-15-2018, 09:56 AM
Replies: 2
Views: 354
Posted By Aluminum
I suppose both will work, but the first way is...

I suppose both will work, but the first way is much easier: spot-weld an oversized piece, fillet the inside with flox, cut/sand away excess. Exactly as described in the manual worked well for...
Forum: RV General Discussion/News 04-12-2018, 11:15 PM
Replies: 4
Views: 838
Posted By Aluminum
Can't say project A is ever really finished, but:...

Can't say project A is ever really finished, but: four years and hundred Hobbs since airworthiness until putting in the order for B on July 4th. The itch wouldn't go away. All better now. My main...
Forum: California 04-12-2018, 10:55 PM
Replies: 4
Views: 296
Posted By Aluminum
EAA Chapter 62 has a Young Eagles event this...

EAA Chapter 62 has a Young Eagles event this Saturday at RHV, we always need pilots and ground crew.

EAA Chapter 338 (a builders' chapter) also meets at RHV second Tuesdays. Quite a few RVs at the...
Forum: RV-8/8A 04-10-2018, 07:27 PM
Replies: 31
Views: 4,491
Posted By Aluminum
I'd bet $1 that they would reduce net cooling...

I'd bet $1 that they would reduce net cooling flow. Would be interesting to stick a pitot or two in the opening and burn some avgas in the name of science. :p
Forum: RV-8/8A 04-10-2018, 11:05 AM
Replies: 31
Views: 4,491
Posted By Aluminum
Neat, what camera was used to record this? You...

Neat, what camera was used to record this?

You should round the sharp edge aft of the exhaust pipes to >1" radius and add a little (0.25" - 0.5") spoiler on the opposite (fore) edge of the opening...
Forum: Alternative Engines 04-09-2018, 10:54 AM
Replies: 7
Views: 909
Posted By Aluminum
In that thrust range there is the Czech engine...

In that thrust range there is the Czech engine used for SubSonex, PBS TJ100 (http://www.pbsvb.com/customer-industries/aerospace/aircraft-engines/tj-100-turbojet-engine). Not enough thrust for an RV,...
Forum: Alternative Engines 04-09-2018, 09:09 AM
Replies: 7
Views: 909
Posted By Aluminum
Many amateurs are successful at building...

Many amateurs are successful at building turboshafts around automotive boosters these days, see here (http://jetandturbineowners.proboards.com/thread/53/landspeed-bike-diy-gas-turbine) and here...
Forum: Painting your RV 04-07-2018, 05:19 PM
Replies: 16
Views: 2,582
Posted By Aluminum
I applied a small patch of 3M automotive vinyl to...

I applied a small patch of 3M automotive vinyl to pristine polysiloxane topcoat several days ago. Rubbed only, no heat gun. Today I tried lifting corners with 90 psi shop air. Good news: boundary...
Forum: RV General Discussion/News 04-07-2018, 05:02 PM
Replies: 286
Views: 91,042
Posted By Aluminum
Gasp! Someone is lying on teh internetz!...

Gasp! Someone is lying on teh internetz! :eek:

These do draw about 14W per enclosure, which could produce about 1500 lm out of those Cree LEDs at nominal specs. If I were designing the controller,...
Forum: RV General Discussion/News 04-06-2018, 12:50 PM
Replies: 286
Views: 91,042
Posted By Aluminum
Bob, is the reason for the DC-DC converter noise...

Bob, is the reason for the DC-DC converter noise suppression?

I just received these inserts from Kaidomain (slow shipping) and they appear to be regulated internally for constant power. They kick in...
Forum: RV Ongoing Maintenance Issues 04-06-2018, 11:41 AM
Replies: 1
Views: 333
Posted By Aluminum
If not exposed to sunlight: epoxy primer is...

If not exposed to sunlight: epoxy primer is probably enough. There are 2k spray cans (https://www.eastwood.com/eastwood-s-2k-aerospraytm-epoxy-primer-gray-black.html) that are ideal for small jobs...
Forum: VAF Classifieds (posts in here deleted after 30 days) 04-05-2018, 01:04 PM
Replies: 2
Views: 239
Posted By Aluminum
email sent

email sent
Forum: RV General Discussion/News 04-04-2018, 12:08 PM
Replies: 30
Views: 5,425
Posted By Aluminum
Either tester will reveal the same problems....

Either tester will reveal the same problems. Doing the test with the wrong tester is still preferable to no test, or to misinterpreting the results obtained with the correct tester. :D
Forum: RV-7/7A 04-01-2018, 10:41 AM
Replies: 19
Views: 2,824
Posted By Aluminum
We sort of do, from the serial numbers. My 14A...

We sort of do, from the serial numbers. My 14A #404 was ordered about five years after the model was announced, meaning that Van's shipped about 80 starts per year on average, likely fewer in the...
Forum: RV General Discussion/News 03-27-2018, 10:56 AM
Replies: 5
Views: 776
Posted By Aluminum
Talking The trouble with acetone is that, while it does...

The trouble with acetone is that, while it does dissolve most oils readily, it also evaporates rapidly leaving behind all those oils chemically unaltered. It can make cleanup much more difficult by...
Forum: RV General Discussion/News 03-26-2018, 07:55 PM
Replies: 5
Views: 776
Posted By Aluminum
Does Simple Green remove CorrosionX completely?

If not, what does?

"Completely" as in, for paint to not come undone.
Forum: RV General Discussion/News 03-26-2018, 07:48 PM
Replies: 7
Views: 678
Posted By Aluminum
I wear Bose QC 20 earbuds in the shop most of the...

I wear Bose QC 20 earbuds in the shop most of the time. Not wireless, rechargeable. The battery+controller unit is tiny. They do very well with riveting, make an occasional loud popping noise when...
Forum: RV-14 03-25-2018, 10:45 PM
Replies: 25
Views: 3,577
Posted By Aluminum
I'll venture a guess that this is not out of...

I'll venture a guess that this is not out of concern for the bolt itself but for the materials joined by it, which in aerospace applications will typically be of much lower tensile strength than the...
Forum: RV-14 03-25-2018, 11:28 AM
Replies: 25
Views: 3,577
Posted By Aluminum
The build manual for the -14 shows castellated...

The build manual for the -14 shows castellated nuts here too, torqued to spec and safetied with a cotter pin. Perhaps you meant "metal locknut" which also appears castellated but is not safetied?...
Forum: RV-14 03-23-2018, 11:00 AM
Replies: 25
Views: 3,577
Posted By Aluminum
Another thing to worry about: most "clicker"...

Another thing to worry about: most "clicker" torque wrenches have high inaccuracy near the ends of their range, even when freshly calibrated.

I find these little doodads to be superior in...
Forum: COMM 03-20-2018, 11:36 AM
Replies: 7
Views: 973
Posted By Aluminum
FWIW, my Bose QC 20 earbuds are USB-charged and...

FWIW, my Bose QC 20 earbuds are USB-charged and cancel airplane noise just as well as modern aviation headsets. I often use them en-route for comfort, then switch to AKGs to talk on the...
Forum: Painting your RV 03-18-2018, 06:27 PM
Replies: 16
Views: 2,582
Posted By Aluminum
Very interesting! A quick googling for "carbon...

Very interesting! A quick googling for "carbon bed fire" comes up with great bedtime horror stories...
Forum: Painting your RV 03-16-2018, 10:22 PM
Replies: 16
Views: 2,582
Posted By Aluminum
Wait, what? You say your INLET filters get...

Wait, what? You say your INLET filters get overspray!? :eek: As in, fresh outside air coming into the booth?

What kind of spray gun?
Forum: Painting your RV 03-16-2018, 10:30 AM
Replies: 16
Views: 2,582
Posted By Aluminum
This calls for more testing, to see if the vinyl...

This calls for more testing, to see if the vinyl would stick. Cured polysiloxane is so slick that masking tape curls up unless I wet-sand the paint. Perhaps one could wet-sand under decals and polish...
Forum: Painting your RV 03-15-2018, 11:17 PM
Replies: 16
Views: 2,582
Posted By Aluminum
It's a 2-part system, yes. Seems as tough as...

It's a 2-part system, yes.

Seems as tough as epoxy, probably because it does contain some fraction of phenolic resin in the mix if I'm reading the documents correctly. One of the recommended uses is...
Forum: Painting your RV 03-15-2018, 10:55 PM
Replies: 16
Views: 2,582
Posted By Aluminum
Noted. That's why I plan to use the PSX 700...

Noted. That's why I plan to use the PSX 700 (https://www.cgedwards.com/ameron/PSX%20700SG%20Whitepaper%20Final.pdf) system which contains no isocyanates and sprays beautifully without thinning. I...
Forum: Painting your RV 03-15-2018, 10:38 PM
Replies: 16
Views: 2,582
Posted By Aluminum
closed-loop spray booth

I set out to make a spray booth inside the garage, so I bought one of these MiCS5524 VOC sensor breakout boards (https://www.adafruit.com/product/3199) and hooked it up to an oscilloscope to try out...
Forum: RV General Discussion/News 03-06-2018, 03:57 PM
Replies: 30
Views: 5,425
Posted By Aluminum
To me this sounds like your engine sat for a...

To me this sounds like your engine sat for a while before the first test, then you got some oil back onto the rings while repeating with plugs back in? There should be no effect from plugs on other...
Forum: RV-7/7A 03-06-2018, 02:49 PM
Replies: 24
Views: 1,993
Posted By Aluminum
Yup. The best way to measure fuel quantity with...

Yup. The best way to measure fuel quantity with high precision is by weight. Even a cheap bathroom scale eliminates several sources of systematic error that can foil visual estimation. To wit,...
Forum: Tools 02-27-2018, 12:03 PM
Replies: 14
Views: 2,546
Posted By Aluminum
Actually tungsten machines nicely as long as you...

Actually tungsten machines nicely as long as you mind your feeds&speeds. I did it on a Tormach.

Just don't try to abrade it: once it work-hardens nothing will cut it.
Forum: RV-14 02-27-2018, 11:03 AM
Replies: 19
Views: 4,605
Posted By Aluminum
If you put a long set on the yoke of a squeezer...

If you put a long set on the yoke of a squeezer (what instructions tell you not to do lest you damage the yoke) these rivets are easy to reach.
Forum: Painting your RV 02-17-2018, 01:03 AM
Replies: 6
Views: 1,190
Posted By Aluminum
Here:...

Here: http://store.southernpaintandsupply.com/

Sherwin-Williams sells polysiloxane product as well, haven't tried that one.
Forum: RV-14 02-16-2018, 11:55 AM
Replies: 9
Views: 1,098
Posted By Aluminum
The 0.1" too narrow spacing between the bottom...

The 0.1" too narrow spacing between the bottom brackets indicates a part/construction error, tolerances are two orders of magnitude tighter than this. Try and post photos.

I just finished this part...
Forum: Painting your RV 02-15-2018, 11:19 PM
Replies: 6
Views: 1,190
Posted By Aluminum
Google polysiloxane...

Google polysiloxane (https://www.cgedwards.com/ameron/PSX%20700SG%20Whitepaper%20Final.pdf) paint. Different chemistry than polyurethanes and acrylics, higher bond energy so weathers much better than...
Forum: RV Ongoing Maintenance Issues 02-13-2018, 10:36 AM
Replies: 21
Views: 2,213
Posted By Aluminum
Then again, I pay a Bose a month to rent a rusty...

Then again, I pay a Bose a month to rent a rusty hangar older than I am that floods whenever it rains. I find that when a company gets this successful, it's usually because the price is worth it, not...
Forum: RV Ongoing Maintenance Issues 02-09-2018, 11:22 AM
Replies: 21
Views: 2,213
Posted By Aluminum
Many years ago when I broke a Bose consumer noise...

Many years ago when I broke a Bose consumer noise canceling headset while on a business trip, I walked into their retail store to seek advice and they replaced it on the spot without receipt no...
Forum: GPS 02-08-2018, 10:55 AM
Replies: 13
Views: 678
Posted By Aluminum
Cutting it won't change the impedance, but a poor...

Cutting it won't change the impedance, but a poor crimp/solder will increase reflections, and a shorter cable will return more of them into the unit, increasing heat load. I'll venture a wild guess...
Forum: ADS-B 01-31-2018, 11:46 PM
Replies: 24
Views: 3,603
Posted By Aluminum
Affirmative. The couple of times I tried "have...

Affirmative. The couple of times I tried "have parallel traffic on ADS-B" was met with immediate "report traffic in sight". And I thought, like, mmmkay, but my tired eyes sure can't TRACK the enemy...
Forum: RV-14 01-26-2018, 03:30 PM
Replies: 5
Views: 970
Posted By Aluminum
You will find it necessary to "encourage" most of...

You will find it necessary to "encourage" most of the long parts to align with the hole patterns, as the forming/punching/bending process builds in some stress that tends to curve. The preload from...
Forum: RV-8/8A 01-26-2018, 09:25 AM
Replies: 11
Views: 1,678
Posted By Aluminum
Zinc chromate has been outlawed in these...

Zinc chromate has been outlawed in these parts.

I'm curious if anyone has experience with or opinion on zinc phosphate for a quick sprayable...
Forum: RV Building Tips/Techniques 01-26-2018, 09:11 AM
Replies: 12
Views: 2,333
Posted By Aluminum
Keep in mind that the results will be slightly...

Keep in mind that the results will be slightly different on skins of different thickness. A die that produces perfect results on thin tail skins won't look as good on thicker fuse skins.

On test...
Forum: RV General Discussion/News 01-22-2018, 08:34 PM
Replies: 31
Views: 2,342
Posted By Aluminum
Yep, excellent score:...

Yep, excellent score: http://math.ucr.edu/home/baez/crackpot.html

That will be the day when we can haul, what, ten people and 10000 lbs of batteries over 600 miles for $24 worth of electricity. Hey,...
Forum: RV General Discussion/News 01-22-2018, 08:18 PM
Replies: 31
Views: 2,342
Posted By Aluminum
Ha! Neat trick! :cool: Too bad you'd melt...

Ha! Neat trick! :cool:

Too bad you'd melt tungsten if you only burned the oxygen. :D

Those other ten pounds are there for cooling and doing work, and even that isn't nearly enough as evidenced by...
Forum: RV General Discussion/News 01-22-2018, 03:11 PM
Replies: 31
Views: 2,342
Posted By Aluminum
That's a trick question: the correct answer is...

That's a trick question: the correct answer is never, as taught in that high school physics/chemistry class most of these electric skateboard kids didn't pay attention to.

For every pound of...
Forum: RV General Discussion/News 01-19-2018, 12:15 PM
Replies: 17
Views: 1,297
Posted By Aluminum
Straight epoxy/micro will be plenty flexible and...

Straight epoxy/micro will be plenty flexible and won't ever come off. For strongest bond, expose bare aluminum shortly before application (minutes) using sandpaper, or chemical etch with phosphoric...
Forum: RV Building Tips/Techniques 01-10-2018, 06:36 PM
Replies: 64
Views: 6,600
Posted By Aluminum
Error or not, one simple piece of actionable...

Error or not, one simple piece of actionable advice I learned from your analysis is to not fit the canopy when it's hot!

The ideal temperature of all parts when drilling or gluing would be closer to...
Forum: RV General Discussion/News 01-10-2018, 06:20 PM
Replies: 21
Views: 2,029
Posted By Aluminum
Ideal scenario for BRS. Weighs a bit less than...

Ideal scenario for BRS. Weighs a bit less than that third and fourth battery.
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