HIGH PLANES Drifter Profile picture
Jun 18 21 tweets 4 min read Read on X
Okay, so in a few replies to people here today, I've said more or less this:

"The F-35 is a great aircraft but it's a terrible program."

I could write some lengthy thread where I cite a bunch of systems engineering stuff, but here's a better way to explain things.
One explanation for the problems of the F-35 program has been "There are too many cooks in the kitchen."

Let's take that metaphor farther.

The F-35 program is like a restaurant. But the restaurant is very strange.
The restaurant is owned by an absentee owner who has passed day-to-day control to a manager with many years of experience. The owner is so disinterested that he tells the manager that he doesn't care what kind of food is served or how, so long as the diners are happy.
But also, the owner isn't going to pay attention to food reviewers, yelp ratings, or customer complaints. He is going to let the manager determine his own effectiveness in meeting diner satisfaction.

The kitchen has some brilliant, world class, Michelin star chefs. They try.
But for every chef, there are 20 people trying to be expediters and are yelling conflicting instructions about how to correct the food that is being served.

The head chef changes every couple of years or so, but the manager sticks around.
Sometimes the head chef makes some progress in improving restaurant quality, but the manager knows that all he has to do is outwait the chef, who will either go on to serve on the James Beard award committee in their next assignment, or will retire.
Did I mention that this restaurant has either bought out every other restaurant in town or starved it of customers? Diners have to make reservations years in advance and pay at the time of reservation, and pray that what they'll want to eat will be produced when it's their day.
All of this, of course, is only sustained by large infusions of cash from the absentee owner. Occasionally, the owner's wife gets really mad at him and drags him to the kitchen table in their house where he has to explain where all the money is going.
Confused, the owner calls up the manager, who promises that everything will get back on track. The diners are happy and food is going out, just look at all these reports he's compiled! To keep his wife happy, the owner descends to the restaurant for a while.
The owner sets up in the restaurant office. He reschedules all the upcoming food deliveries, fires a few of the cooks and waiters, and maybe switches out the head chef. But he can't fire the manager, the manager is the only one who knows all the passwords to the computers.
Eventually the line cooks figure out how to make a decent meal and crank out food that actually does satisfy diners. This has only happened because the owner put more money into this restaurant than any other restaurant in the history of the world.
Unfortunately, the food always comes out anywhere from 2 to 4 hours after diners order and they're starving. But where else are they going to go? There's no other restaurant in town!
The owner needed to be more involved. The manager should have been fired long ago. Customer feedback needed to be meaningfully incorporated from day one.

The food turned out to be good, but damn, if only things had been done differently, it could have been so much better.
For anyone driving by and thinking "this guy is just an armchair critic of F-35"...I worked on the program for more than a decade. I have seen some shit.
@pre911vibes Congress is the angry wife
the head chef i admit is a bit of a mixed metaphor, he's the guy you most closely associate with the restaurant's food

In this case he's the head of the JPO, who (for much of the program's life) only served a couple of years until being replaced. LM would often wait these guys out.

Until the last few program heads, who have all said some version of "You aren't going to outwait me, I'll be here for 4 or 5 years at least so you better listen to me"
@JamesRaxz @pre911vibes The producers brought in a whole crowd of foodies. The foodies tried food from each of the trucks. Then they all went to the show’s back office, shut the door, and didn’t come out for a long time. Somehow they decided which food truck was best.
@JamesRaxz @pre911vibes The owner hired the manager of the “best” food truck and said, “I’m going to build the best restaurant the world has ever seen. You are going to run it.”

And the rest was history
@PaulGraham4342 Ultimately the protagonist just buys sheep with his own money and does the test anyway.
@NASLACS There is also a backup flight display running on separate hardware in the center pedestal that has airspeed, attitude, and altitude

It would be a real eye raiser if all of these failed simultaneously
@BigBadUSNDawg @NASLACS That is why my replies weren’t “bullshit, impossible” but “tell me more”

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More from @the_engi_nerd

Apr 29
Let's put a bookend on the V-22 thread from the other day and tell the story of why I hated the NVH-3A test aircraft. 🧵
This is BuNo 150614 (614 for short). Delivered in 1962, it served as a transport for Presidents Nixon and Ford. It was then sent to the boneyard, where it stayed until 1984. Returned to service, it found its way to NAS Pax River by 1988, where it served as a test aircraft. Image
Given the one of a kind designation of "NVH-3A", this was the test aircraft for all of the H-3s serving the executive transport role. Sometime in the mid 2000s, 614 was sent to Sikorsky's facility in West Palm Beach for testing new carbon blades and other upgrades.
Read 23 tweets
Apr 27
On June 1, 2009, the VH-71 Presidential Helicopter program was terminated after years of delays and cost overruns. But we still needed a replacement for the NVH-3A as "Marine One".

Here's the story of how I learned that the V-22 wouldn't be that replacement. 🧵

📸 US Navy Image
With the VH-71 cancelled, the program began looking for solutions. Maybe an existing platform could be used. So the program decided to do a study to see if any existing platforms would work. Part of that was an acoustic survey to see just how loud existing platforms are.
At the PMA-274 Presidential Helicopter hangar at NAS Pax River, an array of microphones was installed on one of the hangar doors. The plan: get various helicopters to hover approximately as far away as Marine One will come in to land from the White House, and measure the sound. Image
Read 11 tweets
Apr 26
On April 24, 2024, a CH-53K transported an F-35C, tail number CF-01, from its storage site Naval Air Station Patuxent River, Maryland, to to a Navy unit located at Joint Base McGuire-Dix-Lakehurst, New Jersey.

📸 Kyra Helwick Image
Some of you had questions: why not fly the jet? Wouldn't it be more economical to just update CF-01 to the latest F-35 configuration?

To shed some light on these questions, let's look at how the F-35 program used its test aircraft.

📸 Kyra Helwick Image
After the STOVL Weight Attack effort of 2004, the program established a plan building test aircraft. The program planned on 5 F-35A, 5 F-35B, and 4 F-35C test jets. While these would be supplemented by production jets brought back into test, these 14 jets formed the core. Image
Read 13 tweets
Apr 5
As I've just spent a while riffing on in the replies, being a telemetry engineer on the Sounding Rocket program was...an experience. Read the first few paragraphs of this article.

The scenario being described was literally my job during launch. archive.is/oGqY6
These were the kind of computers being used. Luggable, single board computers. 486s, the "new Dolches" we had were equipped with Pentium 1s @ 66 MHz.

I had to cannibalize three of them to get one working.

I installed Windows 95 on one of these in the year 2013 Image
We would hook these up to a dot matrix printer. I have a very vivid memory of the tractor feed paper we used, they still had reams of it in big boxes with the WALDENBOOKS logo. What a nostalgia trip.
Read 12 tweets
Mar 27
You go to an air show and see one of these on display. An F-35A! But...what's the deal with the black and white stickers all over it? Let's go down the rabbit hole and talk about weapons separation testing on the F-35 as we did it during the SDD days. A 🧵
📸:@Jack1nthecrack Image
Once again, our references are my own experiences and "The F-35 Lightning II: From Concept To Cockpit", specifically Chapter 16, "F-35 Weapons Separation Test and Verification". This chapter is also available standalone if you have AIAA access: arc.aiaa.org/doi/10.2514/6.…
Image
The F-35 program performed 183 stores separation tests, all safely, during F-35 system design and development. Each one of these tests was carefully planned and monitored to make sure things didn't go wrong.

Here's one famous mishap from F-18 @ Pax River
Read 12 tweets
Feb 13
F-35 Flight Test Instrumentation Thread 🧵 F-35 Flight Test Instrumentation Thread
Once again, I'm riffing from "The F-35 Lightning II: From Concept to Cockpit". Specifically, Chapter 6, "F-35 System Development and Demonstration Flight Testing at Edwards Air Force Base and Naval Air Station Patuxent River".

But also, I was an instrumentation engineer at PAX. The F-35 Lightning II: From Concept to Cockpit Edited by Jeffrey W. Hamstra, Lockheed Martin Corporation  Part of AIAA's "Progress in Astronautics and Aeronautics" series.
Flight test instrumentation (FTI) is a central flight test engineering discipline. In meme terms, we fuck around and find out, but we fuck around *very carefully* and we make detailed records of finding out. The FTI system makes that record of what happens with the airplane.
Read 28 tweets

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