Wilbur ★ Posted September 23, 2019 Share #1 Posted September 23, 2019 Everyone knows a Boeing 707 was rolled overhead the Seafair festival in Seattle. It was done to show the crowds the maneuverability and safety of the aircraft. One one flight, McDonnell Douglas broke two records in the competing DC-8. What did they do? Link to comment Share on other sites More sharing options...
jsharr ★ Posted September 23, 2019 Share #2 Posted September 23, 2019 Broke sound barrier / super sonic flight Link to comment Share on other sites More sharing options...
Wilbur ★ Posted September 23, 2019 Author Share #3 Posted September 23, 2019 16 minutes ago, jsharr said: Broke sound barrier / super sonic flight That alone didn't break the record. Keep googling! Link to comment Share on other sites More sharing options...
Popular Post ChrisL Posted September 23, 2019 Popular Post Share #4 Posted September 23, 2019 A double roll with a plane full of passengers. 1st double roll & simultaneous hurl record. 6 Link to comment Share on other sites More sharing options...
Road Runner Posted September 23, 2019 Share #5 Posted September 23, 2019 The first large plane I ever flew on was a 707. Flew from Chicago to Los Angeles in 1969. 1 Link to comment Share on other sites More sharing options...
jsharr ★ Posted September 23, 2019 Share #6 Posted September 23, 2019 57 minutes ago, wilbur said: That alone didn't break the record. Keep googling! The 41000 fott dive to gain the airspeed 1 Link to comment Share on other sites More sharing options...
Wilbur ★ Posted September 23, 2019 Author Share #7 Posted September 23, 2019 Just now, jsharr said: The 41000 fott dive to gain the airspeed You are close on both. The first Transport Category aircraft to break the speed of sound and reach an altitude of 51,000 feet. Tough old bird! Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 23, 2019 Share #8 Posted September 23, 2019 Was almost a total failure due to errors in the initial wing design. Became the range and performance leader however by becoming the first "fan jet" airliner as opposed to the straight turbojets used by Boeing and others. Thus says the "fan jet" maker. At one point, P&W was shipping almost 800 JT3D engines per month. Link to comment Share on other sites More sharing options...
Ralphie ★ Posted September 23, 2019 Share #9 Posted September 23, 2019 36 minutes ago, maddmaxx said: Was almost a total failure due to errors in the initial wing design. Became the range and performance leader however by becoming the first "fan jet" airliner as opposed to the straight turbojets used by Boeing and others. Thus says the "fan jet" maker. At one point, P&W was shipping almost 800 JT3D engines per month. Can you save me a little wear and tear on my google and ‘splain the difference, Reader’s Digest version? Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 23, 2019 Share #10 Posted September 23, 2019 In a turbojet, everything happens inside the tube......intake, fuel, ignition and exhaust in a linear flow through manner. In a fan jet, there is a turbo jet inside and an outer tube that passes some (30%) compressed air front to rear without fuel or ignition. The "fan" is large enough to cover both inside and outside tube. The extra external air also provides thrust as the outer part of the "fan" acts like a ducted propellor system. 2 Link to comment Share on other sites More sharing options...
team scooter Posted September 23, 2019 Share #11 Posted September 23, 2019 Kinda off topic maybe, but I was napping on the couch yesterday when I heard a jet flying overhead. It sounded different, kinda loud and spooky. Checked Flightradar and it was an Antonov 124, one of 55 of them built, flying over my house. Never saw one in the wild before. 3 Link to comment Share on other sites More sharing options...
Ralphie ★ Posted September 23, 2019 Share #12 Posted September 23, 2019 Thanks, maxx. Cool! Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 23, 2019 Share #13 Posted September 23, 2019 24 minutes ago, RalphWaldoMooseworth said: Thanks, maxx. Cool! That's the readers digest version. Did you want to know that there are actually 2 shafts inside the engine, an inner and an outer with the fan being driven slower than the compressors. The most frontward turbines drive the rearmost compressors and the last stages of turbine drive the fan. No. I thought not. Link to comment Share on other sites More sharing options...
Wilbur ★ Posted September 23, 2019 Author Share #14 Posted September 23, 2019 11 minutes ago, maddmaxx said: That's the readers digest version. Did you want to know that there are actually 2 shafts inside the engine, an inner and an outer with the fan being driven slower than the compressors. The most frontward turbines drive the rearmost compressors and the last stages of turbine drive the fan. No. I thought not. Yet, suck, squeeze, bang, blow still applies. 1 3 Link to comment Share on other sites More sharing options...
Ralphie ★ Posted September 23, 2019 Share #15 Posted September 23, 2019 1 minute ago, wilbur said: Yet, suck, squeeze, bang, blow still applies. That is the REAL Reader’s Digest version! Link to comment Share on other sites More sharing options...
Ralphie ★ Posted September 23, 2019 Share #16 Posted September 23, 2019 1 hour ago, team scooter said: Kinda off topic maybe, but I was napping on the couch yesterday when I heard a jet flying overhead. It sounded different, kinda loud and spooky. Checked Flightradar and it was an Antonov 124, one of 55 of them built, flying over my house. Never saw one in the wild before. Thing looks like a caterpillar. Looks like all those wheels are to facilitate landing on rough airstrips. 1 Link to comment Share on other sites More sharing options...
Parr8hed Posted September 23, 2019 Share #17 Posted September 23, 2019 2 hours ago, team scooter said: Kinda off topic maybe, but I was napping on the couch yesterday when I heard a jet flying overhead. It sounded different, kinda loud and spooky. Checked Flightradar and it was an Antonov 124, one of 55 of them built, flying over my house. Never saw one in the wild before. that's got a lot of taars. 1 Link to comment Share on other sites More sharing options...
Parr8hed Posted September 23, 2019 Share #18 Posted September 23, 2019 1 hour ago, wilbur said: Yet, suck, squeeze, bang, blow still applies. That's how both of my kiddos were conceived. 1 1 Link to comment Share on other sites More sharing options...
Rattlecan ★ Posted September 23, 2019 Share #19 Posted September 23, 2019 2 hours ago, team scooter said: Kinda off topic maybe, but I was napping on the couch yesterday when I heard a jet flying overhead. It sounded different, kinda loud and spooky. Checked Flightradar and it was an Antonov 124, one of 55 of them built, flying over my house. Never saw one in the wild before. Pfft. Still only a 24 wheeler. 2 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 23, 2019 Share #20 Posted September 23, 2019 1 hour ago, wilbur said: Yet, suck, squeeze, bang, blow still applies. That is funny but at one time I had to go through the engine school where gas flow, pressure and temperature are measured in each stage of the engine and how much performance is lost when extracting air from high pressure areas to travel through cooling passages in lower pressure but hotter sections. It's sort of amazing to think to 1000degf air being extracted from one part of the engine to be routed through the cooling passages in turbine blades that may be seeing 1800 degf. You can't just use cold outside air because it's at a much lower pressure than the area it's being routed to so you go to high pressure areas in the engine to find colder air than what you need. Each of these extractions of air contributes to some measurable loss of engine performance......and also a gain as you are returning it to somewhere in the engine. The math sucks. Your head will spin. Jet engines are really neat machines. 1 1 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 23, 2019 Share #21 Posted September 23, 2019 1 minute ago, Rattlecan said: Pfft. Still only a 14 wheeler. Time to see the eye doctor again. Link to comment Share on other sites More sharing options...
Rattlecan ★ Posted September 23, 2019 Share #22 Posted September 23, 2019 1 minute ago, maddmaxx said: Time to see the eye doctor again. Haha. Right you are. I hit the 1 key by mistake. 1 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 23, 2019 Share #23 Posted September 23, 2019 8 minutes ago, Rattlecan said: Haha. Right you are. I hit the 1 key by mistake. 6 to a side main and 4 nose. They are a bonafide 16 wheeler. Bigger status symbol. Link to comment Share on other sites More sharing options...
Wilbur ★ Posted September 23, 2019 Author Share #24 Posted September 23, 2019 13 minutes ago, maddmaxx said: 6 to a side main and 4 nose. They are a bonafide 16 wheeler. Bigger status symbol. And the rear trucks turn Link to comment Share on other sites More sharing options...
Wilbur ★ Posted September 23, 2019 Author Share #25 Posted September 23, 2019 27 minutes ago, maddmaxx said: That is funny but at one time I had to go through the engine school where gas flow, pressure and temperature are measured in each stage of the engine and how much performance is lost when extracting air from high pressure areas to travel through cooling passages in lower pressure but hotter sections. It's sort of amazing to think to 1000degf air being extracted from one part of the engine to be routed through the cooling passages in turbine blades that may be seeing 1800 degf. You can't just use cold outside air because it's at a much lower pressure than the area it's being routed to so you go to high pressure areas in the engine to find colder air than what you need. Each of these extractions of air contributes to some measurable loss of engine performance......and also a gain as you are returning it to somewhere in the engine. The math sucks. Your head will spin. Jet engines are really neat machines. Tell me about it! My job is juggling system demands and available bleed with operational needs. Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 23, 2019 Share #26 Posted September 23, 2019 24 minutes ago, wilbur said: Tell me about it! My job is juggling system demands and available bleed with operational needs. Ah, that's right. I had never considered crew options for pulling air out of the engine. Do you have some lists of performance decreases per system drawing air? Link to comment Share on other sites More sharing options...
Wilbur ★ Posted September 23, 2019 Author Share #27 Posted September 23, 2019 7 minutes ago, maddmaxx said: Ah, that's right. I had never considered crew options for pulling air out of the engine. Do you have some lists of performance decreases per system drawing air? Multiple charts, especially where takeoff and first two climb segments are concerned. 1 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted September 23, 2019 Share #28 Posted September 23, 2019 22 minutes ago, wilbur said: Multiple charts, especially where takeoff and first two climb segments are concerned. Up trumps passenger cool. Link to comment Share on other sites More sharing options...
Rattlecan ★ Posted September 23, 2019 Share #29 Posted September 23, 2019 1 hour ago, maddmaxx said: 6 to a side main and 4 nose. They are a bonafide 16 wheeler. Bigger status symbol. OK, so I really do need my eyes checked. I thought it was 10 to a side. Link to comment Share on other sites More sharing options...
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