What about the eraser? What about the machine that mills the pumice that goes in the eraser? What about the yellow paint? Are you gonna go with cadmium pigment or something that won’t kill children, and if so, what? How to you plan to refine the bauxite ore to make the aluminum ferrule that attaches the eraser to the pencil? Were you aware that they are aluminum, or called ferrules? What about the machine that makes the pierced holes through the ferrule that retains the eraser?
I know a shitload of trivia about both manufacturing and pencils. But I could not possibly recreate all the processes needed to manufacture a pencil.
I learned a lot about pencils from this article. It is also applicable to jet engines.
Given the times, these vehicles need a bumper sticker that says “This is not an IED.”
Jeff Lane has a few of these in the Lane motor museum in Nashville. Just about everything in the museum is in operating condition and he likes to show his collection off on weekend demo days, but I haven’t had a chance to see these run. Great car museum, all oddball cars, nothing normal. They recently finished building an accurate reproduction of the Fuller Dymaxion. https://www.lanemotormuseum.org/collection/cars/item/dymaxio...
I suppose that depends on your definition of “now”. BMW has had a 20 year history of fork lower failures on their adventure bikes. Just search “BMW Fork Failure” and you will find a lot of discussion. Here was a Microsoft friend’s wreck in Alaska, which I believe was one of the earliest ones. Front wheel complete separated while she was riding straight and level on a paved road.
Unlike all the other guesses here, I actually do have experience with manufacturing specialty aerospace fasteners similar in size, shape, complexity, and precision as these. These are most assuredly being manufactured on a specialty tool called a “Swissing Lathe”, or Swiss CNC machine, because that is the machine you always use to make parts like this. It is a multi-headed turret mill combined with a lathe that can continuously feed a piece of long bar stock and continually spit out fasteners. They were invented many years ago to produce extremely high precision small screws for watches, and in fact Citizen is one of the main vendors of these tools to this day. Based on my experience I would expect the cycle time for making this part to be 30 seconds or so.
Here’s a good video that eli5’s the difference between a Swiss screw machine and conventional CNC.
And here’s a video with a high quality soundtrack that shows how the machine combines automatic lathe cuts, mill cuts, and thread rolling without changing machines, swapping cutters, or re-fixturing the work.
Aerospace Engineer here. In my industry, hand-tied harnesses are commonplace at every level, from homemade garage-built aircraft, throughout all current commercial aircraft, and extending to the Mars Rover. It’s also commonplace in better racecar and motorcycle wire harness builds. I will frequently use cable ties to temporarily assemble a harness, then hand tie the final configuration and cut off the cable ties.
Also, I guarantee you there is no better tool for flush-cutting cables ties so you don’t get scratched by em than the IGAN-P6 side cutters sold on Amazon for around seven dollars. I bypass my Snap-On cutters and grab them every time.
If I am really, really forced to use a cable tie I prefer Cobra Ties, which have a low-profile head that keeps the tail parallel to the band, rather than protruding at a 90 degree angle.
I wonder what your liability would be in the event your balloon were to be struck by a commercial aircraft and cause injury to the flight crew or passengers?
They basically can shoot (not only throwing!) entire frozen chicken cadavers into engines with zero damage.
The only way they managed break the entire engine was to place little explosives on the turbine wings. Even that didn't cause a fatal disintegration of the jet engine.
Somewhere on YT there's a super entertaining video from a test facility.
Well first, the linked article was regarding a weather balloon that impacted the windscreen, not the engine, and it did cause an injury to the flight crew. Here are pictures of the bloody, glass-shard filled flight deck. https://www.facebook.com/aviation247/posts/n17327-united-air... So the hazard is real.
Now back to your uninformed comment. I do certification testing of jet engines, and we most certainly DO NOT test jet engines against the ingestion of airborne electronics.
I have personally loaded and fired the five barrel bird gun at General Electric’s Peebles Test operation many times over the years. We use a range of birds and bird simulators, but none of them are ever chickens, and none of them are frozen.
There is not any requirement for zero engine damage. Little sparrows will do no damage. Ducks and geese cause extensive damage every single time. Extensive engine damage is permitted so long that the engine shuts down without causing catastrophic damage to the airframe. The specific damage that must be prevented, per 14 cfr 33.75, is below. Any other damage is acceptable.
(i) Non-containment of high-energy debris;
(ii) Concentration of toxic products in the engine bleed air intended for the cabin sufficient to incapacitate crew or passengers;
(iii) Significant thrust in the opposite direction to that commanded by the pilot;
(iv) Uncontrolled fire;
(v) Failure of the engine mount system leading to inadvertent engine separation;
(vi) Release of the propeller by the engine, if applicable; and
Thanks for the very informative post on airline engine testing. One of the quickest upvotes ever. Never knew the details on the range of birds fired and actual damage allowables.
Couple follow on questions. What are the test conditions like? Is the test basically a static air test with a fixed engine and a 500 mph duck / goose carcass striking an operating engine? Or do they put it in a wind tunnel to simulate high speed wind forces also?
Also, what's the method of actually firing and accelerating a duck / goose carcass up to airline speeds for impact. Did this a bit for NASA impact testing, and we tended to use peel away sabot rounds to throw bricks at objects.
Also, borders a bit on a Monty Python joke, yet is there a regulation duck / goose? They can vary pretty wildly in size / weight. 5lb, 10lb, 20lb? Are they firing all the way up airline cruise speeds (500-600 mph? or just take off / landing runway issues?
Finally, being in the industry, any idea on what's been going on with the engines peeling off airplane wings, like that Louisville, Kentucky cargo plane? That seems like a rather drastic failure mode, since apparently there were cracks in the mounting and people just weren't checking?
Great Clips or Weldon Barber, are you feeling lucky?
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