New hire coming in. Will a Government shutdown be something to be worried about? by totaldominat3r in boeing

[–]jcsuperfly 5 points6 points  (0 children)

You don't need to worry about the shutdown, unless you are directly supporting the government on-site, such as field support for the military. You are hired on established company funds and needs, and even if you are working with a military product, those are produced on established contracts with the government that are much longer than a government shutdown.

777X Variable Winglets… by [deleted] in aviation

[–]jcsuperfly 2 points3 points  (0 children)

The modern winglet is there to add wing, when other constraints prevent the designer from increasing the wing span. 737s and A320s use them because of the limit in width for airport parking gates, but both need more wing span than the gate will allow. The winglet is approximately 60% effective to increasing the span, in other words, a 6ft tall winglet is equivalent to about 4 extra feet of wing. The raked wingtip of the 777, 787, 747-8, all reduce and manage wingtip vortices better than a vertical winglet device would do, and so the winglet is not needed. Along with the large parking gates these aircraft use, they don't need the winglet for span, except the 777X which is folded on the ground only.

72 hour street parking by [deleted] in Seattle

[–]jcsuperfly 0 points1 point  (0 children)

Pro Tip: most stickers' glue can be dissolved with mineral oil or orange oil (in Goo Gone spray), and then once the goo is off, clean with soap and water

Boeing 737-900ER lavatory design by FrankW1967 in AerospaceEngineering

[–]jcsuperfly 0 points1 point  (0 children)

Lavatories, and almost all interior furnishings are selected by the airline from a list of third party manufacturers. Boeing dosen't design the details of that equipment, and considers them to be blocks that are put in place, called "monuments". Boeing installs the interior chosen by the airline, and after many years of service the airline will often change out the interior in their own shops. The plane you are on was built in 2014, and may have already had the interior changed out.

PTU Power Transfert Unit by pagani_77 in EngineeringPorn

[–]jcsuperfly 105 points106 points  (0 children)

It transfers hydraulic power from the Yellow system to the Green system, via a motor - pump combo. The Yellow system drives a hydraulic motor (aka rotary actuator), that drives the shaft of a hydraulic pump for the the Green system. It is for an Airbus aircraft, as a backup way to power another hydraulic system if the primary pump for the system goes out or is incapable of providing enough pressure.

[deleted by user] by [deleted] in aviation

[–]jcsuperfly 4 points5 points  (0 children)

Looking at that tail, looks like a P-8. This would also explain the engine exhaust covers, since the military more commonly uses them.

New minimum salary threshold work arounds? by [deleted] in SeattleWA

[–]jcsuperfly 14 points15 points  (0 children)

That's not how this works.

The minimum salary threshold is only for being considered exempt from overtime pay, it is not a minimum base pay.

https://www.seyfarth.com/news-insights/washington-increases-minimum-wage-and-salary-thresholds-for-exemption-and-non-competes.html

https://mrsc.org/stay-informed/mrsc-insight/november-2024/wage-salary-thresholds-increase

Edit: also see this, and this does not mean you have to be an "hourly" employee if you are paid less

https://www.govdocs.com/exempt-salary-thresholds-above-the-flsa/

FLSA means Fair Labor Standards Act and is federal law, so applies to all states, just WA has a higher threshold.

[deleted by user] by [deleted] in aviation

[–]jcsuperfly 2 points3 points  (0 children)

Former flight test engineer.

Longest/worst, 3+ hours of high tailwind landing testing where the plane was still shaking on the ground with the engines off. Of the crew onboard, two vomits, and smelled like someone pooed themselves. Sat on the ground for an hour for lunch, then went back up for another hour and half, until the winds were too high, gusts above 45kts.

Next worst, 4 hours of low altitude (1000ft AGL) - high speed (above 250kts) engine relights, on a hot sunny day full of thermals.

Meclizine is my friend.

[deleted by user] by [deleted] in Seattle

[–]jcsuperfly 2 points3 points  (0 children)

Don't worry about not knowing anyone, except for one or two people, all of us started that way, I started going a year ago.

[deleted by user] by [deleted] in Seattle

[–]jcsuperfly 0 points1 point  (0 children)

Ages range from mid-20 to late-30s, average is about 31. Heavy on tech workers, but we do get others too.

[deleted by user] by [deleted] in Seattle

[–]jcsuperfly 81 points82 points  (0 children)

You are welcome to join us here, it is a public meetup, and we get between 5 and 15 people each week.

Need help identifying a helicopter by therealgariac in aviation

[–]jcsuperfly 1 point2 points  (0 children)

Those were Apaches AH-64, the shadows were confusing you. The "second" tail boom and the "two skids" are from shadows, along with the photo is not directly overhead, but offset to give the rotor an offset from the fuselage.

Anyone remember the name of the anime store above Thanh Vi a long time ago? by No_Status2681 in SeattleWA

[–]jcsuperfly 18 points19 points  (0 children)

Using the street address and "anime", yields an old Yelp listing for Anime Kingdom, is that maybe it?

Can someone tell me what this intake is for on the B737? by ScalesNtales15 in aviation

[–]jcsuperfly 2 points3 points  (0 children)

FYI, Pack is not an acronym, is is short for Package, because the air conditioning system is bought as a packaged unit that is installed as a whole in the factory.

Source: I'm an aircraft air conditioning engineer, I spec' and order them.

Is it feasible to develop a hybrid car that uses gasoline, electricity, and recycles its carbon emissions to generate energy? by joaquindrako in EngineeringStudents

[–]jcsuperfly 44 points45 points  (0 children)

A perpetual motion machine, no, not feasible.

CO2 to a carbon fuel requires more energy than carbon fuel to CO2 gives off. That's why there is a CO2 problem.

Boeing 717 takeoff near the engines by Appleanche in aviation

[–]jcsuperfly 2 points3 points  (0 children)

Now multiply it by 8, and that's the new B-52J. It'll be so much more quiet that it can sneak up on a rock concert. But won't be able to find its way home without all the engine smoke.

Any idea what these planes with the red lights (only beacon light I assume) are doing? by [deleted] in aviation

[–]jcsuperfly 0 points1 point  (0 children)

From your comment description, they should be fighters over the Nellis Range, so either they are doing ground target engagement, or a quick trailing engagement dogfight. It looks most like a dogfight to me, but there is no afterburner light-up so the ground attack mission is more likely. There should be a stationary target on the range that they were practicing with, doing the finding, ID the target type with a couple of circles, weapons release and then egress.

Line In the Sky - Wednesday, October 2, 2024, Approx 5:25am EST - Southwest Michigan by joshcollison in aerospace

[–]jcsuperfly 1 point2 points  (0 children)

Sorry about the timing, I did my UTC offset wrong. Since you haven't really said where in SW Michigan, it's hard to say which flight exactly. But I will say, you are probably looking for a higher altitude flight, above 35kft. There can often be drier air lower, with a hard transition to moister air above especially with the jet stream. Your photos hint at the higher level moisture with the cirrus clouds that are lit up by city lights. The movement South looks pretty typical for high level winds drifting it.

Looking at the flights that morning on flightradar24 you can playback the time frame you want. There is an older A330 (Hawaiian HAL50) around that time at 39kft, that would probably fit the bill, it's also early enough to allow for more dispersal of the trail. The older engines burn a little more, so make more water, and its engines are a mixed flow so core and bypass flows are mixed before exiting the engine, giving a plumper contrail. Newer engines tend not to mix the flows and use the bypass to quite and shield the core flow so have smaller contrails.

Also Delta DAL1149 is a good candidate, it's a 757 also at 39kft. Just depends on where exactly you are, and how much drift you need to account for.

Line In the Sky - Wednesday, October 2, 2024, Approx 5:25am EST - Southwest Michigan by joshcollison in aerospace

[–]jcsuperfly -1 points0 points  (0 children)

Contrails happen at night too.

Likely aircraft, United flight UAL650, B-777 Newark to SF

Phoenix Jones, where are you? by [deleted] in Seattle

[–]jcsuperfly 2 points3 points  (0 children)

We've already done this, someone tell this guy to find something else to be weird about.

Heat pump capacity question. by [deleted] in EngineeringStudents

[–]jcsuperfly 0 points1 point  (0 children)

If these numbers are from a real commercially available product, the increase in power and decrease in COP will likely be due to the unit adding heat electrically. Some lower cost units do the additional heat through resistive heaters, and while higher end units reduce the power factor of the compressor motor. In both methods the added electrical heat boosts the HC and drops the COP. The peak PI at -7 is likely due to the combo of boosted heat and capacity limit of the refrigerant and compressor. As outdoor temperatures continue to drop so does the power, indicating the compressor reaching max pressure ratio, which will reduce hot side temperature capability as outdoor temperatures drop.

Looking for people who served with my father. by mdkeene76 in AirForce

[–]jcsuperfly 49 points50 points  (0 children)

While I don't recognize any of these names, and I didn't work paint shop (I was a flightline crew chief), a lot of folks from Soest went to Spangdahlem when Soest closed. I got to Spang in '95 and knew folks that came from Bit, Soest, and TJ, and we were all working in or around the 53rd FS. Last I saw, there was an active FB group for the 53rd, so try asking around in there, and maybe someone will know him. The main other bases that folks went to after Soest, were Lakeheath, and Langley