Edwin

@EngrUnlocked • 3,041 subscribers

Engineering|Aviation||space|||science 🧪

Shorts

Everyone watches the rocket. Watch the four numbered boxes on the left. Those are Artemis II's escape baskets. Artemis I didn't need them because nobody was aboard. If the countdown goes wrong, the crew climbs in about 375 ft up and rides a 1,335 ft cable down to the edge of the pad. In this clip they're already sliding off as the stack climbs. No motor. No software. No power. Just gravity. The one system you need when everything else has failed shouldn't depend on anything else. The part people miss is that getting down is easy, stopping is the problem. A frictionless 375 ft drop would hit roughly 100 mph. So NASA went with mechanical braking, a drag chain and a catch net, instead of magnetic. 8.8 million pounds of thrust is the poster number. About 100 mph is the one the brakes have to answer to.

Everyone watches the rocket. Watch the four numbered boxes on the left. Those are Artemis II's escape baskets. Artemis I didn't need them because nobody was aboard. If the countdown goes wrong, the crew climbs in about 375 ft up and rides a 1,335 ft cable down to the edge of the pad. In this clip they're already sliding off as the stack climbs. No motor. No software. No power. Just gravity. The one system you need when everything else has failed shouldn't depend on anything else. The part people miss is that getting down is easy, stopping is the problem. A frictionless 375 ft drop would hit roughly 100 mph. So NASA went with mechanical braking, a drag chain and a catch net, instead of magnetic. 8.8 million pounds of thrust is the poster number. About 100 mph is the one the brakes have to answer to.

365,853 views

Videos

Anya Rossi

sweetdream.ai

SweetDream.ai•Sponsored•Livecam

Watch Anya Live

Anya is streaming live right now! Join her private show and enjoy exclusive content.

Exclusive private shows

1.2k viewers online

Private Show

Join now for exclusive access

Free preview available • Premium content

This B-1B weighs up to 477,000 lb. Its four engines make about 123,000 lb of thrust with the afterburners lit. That's a thrust-to-weight ratio of roughly 0.26. And it still gets airborne. Thrust doesn't lift an airplane. Wings do. Thrust only has to get you to lift-off speed before the runway runs out. That's why the wings swing forward for takeoff, 137 ft of span fully spread, then sweep back to 79 ft once it's fast. The price is the pivot: more weight and mechanical complexity, on every flight. And the burners roughly triple fuel burn, so they only stay lit for seconds to minutes. Watch the nozzles in the clip. That glow is each engine jumping from about 17,000 lb of thrust to nearly 31,000.

This B-1B weighs up to 477,000 lb. Its four engines make about 123,000 lb of thrust with the afterburners lit. That's a thrust-to-weight ratio of roughly 0.26. And it still gets airborne. Thrust doesn't lift an airplane. Wings do. Thrust only has to get you to lift-off speed before the runway runs out. That's why the wings swing forward for takeoff, 137 ft of span fully spread, then sweep back to 79 ft once it's fast. The price is the pivot: more weight and mechanical complexity, on every flight. And the burners roughly triple fuel burn, so they only stay lit for seconds to minutes. Watch the nozzles in the clip. That glow is each engine jumping from about 17,000 lb of thrust to nearly 31,000.

284,052 views • 6 days ago

This plane has four propellers and five engines. The fifth one is a small turboshaft of about 1,364 hp that never turns a propeller. It runs a compressor that blows air over the flaps, a trick called boundary layer control. It keeps the airflow stuck to the wing at flap angles where an ordinary wing would stall, so a big amphibian can fly as slowly as about 90 km/h. That slow speed is the whole point. Waves don't flatten out for you, and the slower you touch down, the gentler the hit. ShinMaywa says the US-2 can land in waves up to 3 meters. Then there's the spray. Watch the clip the hull has a spray suppressor that pushes water down and spray strips that throw it sideways, so it stays out of the engines. A flying boat has to solve the water as well as the air. Video by Cpl. Madison Sharpe

This plane has four propellers and five engines. The fifth one is a small turboshaft of about 1,364 hp that never turns a propeller. It runs a compressor that blows air over the flaps, a trick called boundary layer control. It keeps the airflow stuck to the wing at flap angles where an ordinary wing would stall, so a big amphibian can fly as slowly as about 90 km/h. That slow speed is the whole point. Waves don't flatten out for you, and the slower you touch down, the gentler the hit. ShinMaywa says the US-2 can land in waves up to 3 meters. Then there's the spray. Watch the clip the hull has a spray suppressor that pushes water down and spray strips that throw it sideways, so it stays out of the engines. A flying boat has to solve the water as well as the air. Video by Cpl. Madison Sharpe

109,775 views • 4 days ago

China built about 2,400 copies of a jet whose licence collapsed before the full data package arrived. The 1961 licence for the MiG-21F-13 fell apart with the Sino-Soviet split. China built it anyway. The first Chinese-built J-7 flew on 17 January 1966, and production only ended in 2013, with a final F-7BGI batch delivered to Bangladesh. Copying the airplane meant copying its engine too. The WP-7 and later WP-13, developed from the Soviet R-11/R-13, became China's first mass-produced afterburning supersonic engines. Which aged better the copy or the original?

China built about 2,400 copies of a jet whose licence collapsed before the full data package arrived. The 1961 licence for the MiG-21F-13 fell apart with the Sino-Soviet split. China built it anyway. The first Chinese-built J-7 flew on 17 January 1966, and production only ended in 2013, with a final F-7BGI batch delivered to Bangladesh. Copying the airplane meant copying its engine too. The WP-7 and later WP-13, developed from the Soviet R-11/R-13, became China's first mass-produced afterburning supersonic engines. Which aged better the copy or the original?

84,658 views • 7 days ago

The F-22 doesn’t need afterburners to stay supersonic. That’s the whole point of “supercruise.” Its two F119 engines produce enough dry thrust for the aircraft to maintain supersonic flight without constantly dumping fuel into the afterburners. The trade-off? Afterburners give you more thrust, but they also burn fuel at a brutal rate. Supercruise gives the F-22 speed without paying that full fuel penalty. The number people miss: Each engine produces about 29,000 lb of thrust with afterburner. So the F-22’s advantage isn't simply having powerful engines. It’s having enough thrust to keep speed without always needing the most expensive setting.

The F-22 doesn’t need afterburners to stay supersonic. That’s the whole point of “supercruise.” Its two F119 engines produce enough dry thrust for the aircraft to maintain supersonic flight without constantly dumping fuel into the afterburners. The trade-off? Afterburners give you more thrust, but they also burn fuel at a brutal rate. Supercruise gives the F-22 speed without paying that full fuel penalty. The number people miss: Each engine produces about 29,000 lb of thrust with afterburner. So the F-22’s advantage isn't simply having powerful engines. It’s having enough thrust to keep speed without always needing the most expensive setting.

87,104 views • 22 days ago

That fireball isn't the shell. It's the gun's exhaust igniting. Propellant burns fuel-rich, so leftover hot gas meets oxygen past the muzzle and burns again. Catch: the flash gives away the ship's position, especially at night. Fix: a few percent potassium salt in the powder.

That fireball isn't the shell. It's the gun's exhaust igniting. Propellant burns fuel-rich, so leftover hot gas meets oxygen past the muzzle and burns again. Catch: the flash gives away the ship's position, especially at night. Fix: a few percent potassium salt in the powder.

30,881 views • 24 days ago

No more content to load