Calmly and as-a-matter-of-factly explains the most visceral thing about jet engines. Golf clap.

that image of twin diamond fire cones against the dusky sunset sky makes me so, so proud of humanity I just cannot comprehend how we made something so incredible. it all begins in the imagination... the unbelievable, staggering power of the human mind when concentrated on achieving an impossible goal

Ive been told that Mach 3.2 was the highest top speed for the air craft. The classified top speed is much, much higher. Really incredible.

@idontcare9797

Жыл бұрын

At Mach 3.5 the Shockwave gets ingested by the engine and it flames out.

@peterssynthetics-independe6786

Жыл бұрын

@@idontcare9797 Probably true I have heard otherwise.

@idontcare9797

Жыл бұрын

@@peterssynthetics-independe6786 There's a good video on the channel airzoo where an engineer who worked on the SR71 talks about the J58 engine.

@GradyGillis

Жыл бұрын

Not true. The max speed is limited to the vicinity of Mach 3.2 by engine temperature. That whole "classified... much higher" business is wishful thinking mythology. I did learn a few things about it in my 9 years of working on it.

@adamkrim8867

8 ай бұрын

You were told wrong

Its not just about the speed of the exhaust, its about the total force of the exhaust, which takes speed into account, as well volume. You can go supersonic if your exhaust is traveling at 1m/s as long as you have enough mass moving through your exhaust to compensate.

@billwildt6335

6 жыл бұрын

I've seen many afterburner exhaust signatures and haven't seen "impulse power" signature in any of them ... I'm still puzzled by the exhaust signature ...

@hoghogwild

5 жыл бұрын

@@billwildt6335 Checkout the RS-25/SSME(Space Shuttle Main Engine-now Space Launch System Main Engine, they also have Mach diamonds in the exhaust. Ambient lighting has a lot to do with exactly what you see as well. In a few months here we are going to see the Core Stage of SLS loaded onto the Pegasus barge(which was recently-jumboised, or had a section cut out of the middle and then adding in a longer section thus increasing the ships total length. The worlds once longest ship in the world, the Gentle Giant/Seawise Giant/Jahre Viking was jumboised) shipped to Stennis and the Core Stage-1 loaded into the B-2 test stand in order to Green Run 4 RS-25 engines at once. Same test as the SIC stage of the Saturn V where they lit all 5 F-1 engines at once. WE'll see mach diamond x 4 engines during this test. There are 16 RS-25/SSME engines left over from the Space Shuttle Program, 14 have actually flown, some of them 8 times, with one of them being built in 2010 with ZERO flight time and another built from parts in 2014 which of course also has zero flight time. With each SLS launch using 4 RS-25s we currently have enough for 4 Exploration Missions with SLS. Rocketdyne has already begun to build brand new Core STage engines with single use expendability in mind. The 16 "old" engines will be run at 109% Rated Performance Level, while the new build RS-25s will be run at 111% RPL. A test a few months ago ran a development engine at 113% which is the highest that an RS-25 engine has ever been throttled. New Additive Manufacturing techniques(aka 3-D printing) are to be used with the new build engines due at KSC in mid 2022. "$1.16 billion contract, which runs from November 2015 through Sept. 30, 2024, is to restart the production line for the RS-25 engine. These production lines have been significantly improved and made more efficient since the retirement of the space shuttle program.."

@The_Oncler.

8 ай бұрын

This Comment was made when I was born

@calvinnickel9995

Ай бұрын

It actually has nothing to do with speed or mass. The gas flow can only be sonic as any gas flow through a tube is “choked” if you try to move it faster. Thus the first part of the jet equation: Ma(V1 - V0) is meaningless because the initial velocity of the air (V0) is actually faster than the final velocity of the air. The only mass that adds to thrust is the fuel: Mf(Vf) since the fuel is being carried in the aircraft. No.. almost all of the thrust is in the last part of the jet equation Aj(Pj - Pamb). When you try to add more force to choked gas flow.. you add pressure to the jet. This will then expand rapidly and push against the nozzle.. generating thrust. Obviously the higher the pressure (Pj).. or the larger the nozzle (Aj).. the more thrust. This works up to Mach 1.. at which point the gas can’t expand fast enough to push. So this is why supersonic jets have a convergent-divergent nozzle and rockets use a bell shaped (De Laval) nozzle or a spike. This allows the expanding gas to exert force on it and generate thrust. It’s interesting that ambient pressure has to be taken into account.. which reduces the thrust. In a jet it’s not noticeable as more efficient thrust in high atmosphere is offset by less air for cooling meaning less fuel can be burned. But rockets are much more efficient in a vacuum.

Mach 3.4 is the max speed. There’s a KZread video from a project manager that worked on the SR-71 engine for 10-20 years. He said a pilot wanted to see how fast it would go and pushed the throttle to the “firewall”. Plane accelerated but at 3.5 both engines flamed out at the same time. Thankfully the pilots were able to restart the engines and land but they got in trouble with the colonel the next day. This guy provided the data to the colonel from the black boxes. With this in mind, 3.4 is the safest max speed. 3.2 is the design target and optimum operating speed.

@calvinnickel9995

Ай бұрын

3.4 can only be achieved in cold air as the compressor inlet temperature is limited to 427°C. Since the speed of sound is slower in cold air, the true airspeed isn’t any faster.

The definition of cool

For me, outside of the English Electric, there's no other aircraft as beautiful as the SR-71.

@dazzlernator

Жыл бұрын

As in the Lightning? That is a lovely looking aircraft.

@orgeebaharvin6284

Жыл бұрын

@@dazzlernator the same one.

EFFIN' COOL!!!

Them diamonds

I wonder what it would be to fly in the SR-71...

@NickyYey

Жыл бұрын

Eardrum dead

@calvinnickel9995

Ай бұрын

Boring. Riding a mountain bike down a single track gives you far more sensation of speed than Mach 3 at 80,000 feet.. which looks almost as slow as it does from a 737 at 35,000 feet. Flying it is no picnic either. It weighs as much as a 737 and has the same amount of thrust and is actually less maneuvering. Getting it to Mach 3 and 80,000 feet is a tedious task of perfectly balancing speed and altitude. Just a little off profile and the aircraft won’t perform at best… or kill you at worst.

@ChrisZoomER

Ай бұрын

@@calvinnickel9995 One time back in August 2017, I saw a 600 mph Delta 767-400ER at 36K feet (contrail) and perpendicular to it, a 400 mph F/A-18 at 24K (no contrail) both directly overhead. So not only was the F/A-18 only 2/3 as fast as the 767, but it was also 2/3 the altitude. This crazy coincidence meant that the two planes appeared to be moving at the same speed, I personally think that’s anything but boring! It warms my heart just thinking about it, those were the good days…

Sounds link Hoot Gibson narrating

@Heliosphan33

Ай бұрын

Absolute legend

interesting

Beautiful you baby good evening

This man is why people fell asleep in school-even interesting subjects are boring when you speak so monotonously. All I could hear was the teacher from Ferris Bueller’s Day Off taking attendance: “Bueller… Bueller….. Bueller…”

J

@calvinnickel9995

Ай бұрын

O