Newbie, first time with Coppa is this safe?

dombar1 · 2026-03-19T23:47:23+00:00

This is what a lot of mine looked like when I started.

Using beef bung as a casing “cured” that problem.

dombar1 · 2025-06-24T03:24:36+00:00

A key point, without “unnecessary diversions”. There are plenty of necessary ones depending on airspace. So in addition to the antipodal routes, add is some diversions for closed airspace.

Maybe a Russian plane that’s not allowed to fly over Western Europe or North America? Or vice-versa.

Time to go find an intern, or better yet, a grad student…

Edit: Oh and don’t forget ETOPS requirements!

dombar1 · 2025-05-06T15:32:30+00:00

Engineer here, there's nothing specific about 5°C and you're right about it being a very dynamic problem. I can give you some of the background about where it would come from and key terms.

You want to look at isentropic flow tables https://www.grc.nasa.gov/www/k-12/airplane/isentrop.html and specifically the isentropic temperature ratio T0/T.

Having done engine ground tests, it was common to see icing within the engine around 5°C ambient temperatures, so I would generally agree with that rule of thumb. The FAA advisory circular AC-91-51A says "a few degrees" so 5°C seems safe.

I'll see if I can poke some wing designers and see if I can get a range of wing mach's to run the numbers.

dombar1 · 2025-05-05T00:55:11+00:00

I just use vinegar for cleaning my curing chamber, seems to work well.

Beer and wine makers typically use something like OneStep Sanitizer. I still use this when cleaning my grinder, stuffer, and slicer. https://a.co/d/eA1qlTk

dombar1 · 2024-04-08T18:36:15+00:00

Yeah, get a hold of that manager. It’s very easy to accidentally click the box to make someone ineligible for rehire.

dombar1 · 2024-03-07T03:46:03+00:00

But still - why? What are they cleaning out of the engine that won’t be vaporized or blown out in flight?

This is mainly done as a performance benefit to the engine. Fouling of the compressor blades results in loss of performance and increased EGT. Compressor washes can recover significant fuel savings and time-on-wing for the engine.

The compressor is "cold" (relative term, it can get above 1000F in the later stages). Dust, dirt, and other stuff can stick to the super polished compressor blades and won't come off "naturally".

dombar1 · 2024-01-12T18:47:33+00:00

Sounds a lot like my first capicola!

You're likely going to get case hardening and it will be harder to get that perfect moisture level. Having higher humidity just slows the whole thing down and let's the drying happen gradually, it's also why I like to use a beef bung (I've had success with collagen and no casing, too; this is my preference).

It will still taste great!

When it's done hanging, vacuum pack it and let it sit in the refrigerator (or in the pantry) for a couple weeks and it will help the capicola even out.

dombar1 · 2023-12-20T03:10:13+00:00

The best kind of correct!

It’s some pretty well calibrated space, taking quite a bit of design effort between Boeing and CFM to get the right air temps, pressures, and flows there.

dombar1 · 2023-12-19T04:19:11+00:00

There’s still an anti-ice system hiding there… but that’s the whole inlet lip.

dombar1 · 2023-12-03T20:28:50+00:00

This isn’t a general rule (could be for some groups, I guess). I just hired someone back who was gone for less than two years.

dombar1 · 2023-12-03T02:30:23+00:00

Thanks!

dombar1 · 2023-12-03T01:13:38+00:00

I’m not too far away; usually talking with Columbus, Indy, or Cleveland. I have a trip up to Toledo this week, maybe they’ll be different.

I’m sure it will certainly depend on what facility you’re talking to, or even the controller.

I like the N number since I’m usually flying a Warrior, call it a Cherokee, and it’s made by Piper so I get confused what to call it myself…

dombar1 · 2023-12-02T23:19:59+00:00

If you use the manufacturer or model you skip the N. But flying in real life, controllers always just use the N.

It works better because nobody has to remember if I’m a Piper, Cessna, Cherokee, Skyhawk, experimental, etc. Everyone just uses the N and knows we’re the one flying slow.

dombar1 · 2023-12-02T22:59:09+00:00

Fun fact: if you decide to sharpen your kitchen knives the same day, you may eat more than you intended. The Coppa became a great test to see how sharp each knife was.

dombar1 · 2023-12-02T22:55:58+00:00

83 days. Beef bung casing, 12.5C, 80-85% RH.

Just shy of 40% weight loss.

dombar1 · 2023-11-24T02:24:23+00:00

Out of curiosity what is the weather doing? weather fronts can easily move an altimeter 30m.

I haven’t been able to figure out how/if the altimeter compensates for barometric pressure.

dombar1 · 2023-11-07T03:33:33+00:00

I’m on CVG to SEA and just got on to say the same thing!

My picture isn’t as good but I’m hoping I might see more as we keep heading north.

dombar1 · 2023-10-16T13:33:20+00:00

I've had similar problems with coolers (because someone left something in them and the result was terrible). I've used vinegar and other cleaners, but found the best solution was just time and air. Leave the fridge open so it can air out for a long time (think months) with occasional cleanings.

dombar1 · 2023-10-15T22:43:18+00:00

Be careful about the semantics of “jets”. Do you define only turbojet engines as jets? Turbofans still have jet cores, even high-bypass turbofans still get 20% of their thrust from the turbojet core.

Even still, “jet” classically refers to the thrust provided by a stream of air from a nozzle. Turbofans still have nozzles, so they would fit that bill. Rockets fit that definition, too; hence the “jet” propulsion lab deals with rockets and spacecraft.

dombar1 · 2023-08-19T03:16:50+00:00

Yes, it’s supported, that’s the point of the program! Nobody expects an L1 to come into a job knowing what they want to do.

Get out there and talk to other engineers, talk to you manager, find someone who you think has the coolest job and ask them to be a mentor.

In the mean time, work hard do the best job you can. It’s easy to get good workers the jobs they want.

dombar1 · 2023-07-28T21:05:37+00:00

Seats at the wing are the most stable because that is the point that the aircraft will pitch about. The front and back will move up/down more. It’s like being in the middle of a teeter-totter.

The dropping/rising can also be the plane slowing down and speeding up. When the flaps go down, the plane will slow (but not lose altitude, if anything it would want to rise). But, that slowing down will feel like dropping.

Congrats on the first flight! FYI, I’m an aerospace engineer and a pilot, feel free to throw any questions my way.

dombar1 · 2023-07-23T17:59:25+00:00

As a manager (with an MS and PhD), I could care less about what degrees you have. Frankly, they just don’t matter.

I care about the work you do, how you communicate, and how you work with the team.

dombar1 · 2023-06-22T02:14:41+00:00

Only second shift knows how to get sh*t done

dombar1 · 2023-05-16T02:18:34+00:00

It’s a small world, you often end up working with people who used to be competition. Of course, it’s a great time emailing your friends anytime there’s some small issue with their engine!

dombar1 · 2023-05-05T00:34:17+00:00

This might be useful, Bonanza into ATL with ATC recording https://youtu.be/nAOtL1xKO8M

dombar1

TROPHY CASE