320tech From Turks and Caicos Islands, joined May 2004, 489 posts, RR: 5 Reply 1, posted (9 years 2 months 1 week 5 days 6 hours ago) and read 5146 times:
All thrust reversers basically work the same way. They move a blocker into the airstream (on high-bypass engines, only the bypass air gets reversed).
The A320 uses four blocker doors that pivot into the airflow. They're hydraulically actuated - the actuators can be seen easily enough if you're in the correct seat.
Cascade reversers use a sliding sleeve (the duct itself). The sleeve moves aft, which simultaneously exposes the exhaust area (looks like a grate) and extends internal blockers. The blockers on the V2500 look particularly flimsy, but obviously work fine.
The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
Kcrwflyer From United States of America, joined May 2004, 3700 posts, RR: 8 Reply 2, posted (9 years 2 months 1 week 4 days 21 hours ago) and read 5101 times:
is a certain kind stronger than another? I was talking with some 737 200 pilots a few years ago at KCRW and they said that the reversers on that aircraft were almost equal to braking in a landing scenario.
Kcrwflyer From United States of America, joined May 2004, 3700 posts, RR: 8 Reply 4, posted (9 years 2 months 1 week 3 days 21 hours ago) and read 5004 times:
not in CRW... the pilots i talk to (regional jet , and dash/saab pilots), say they just reverse to stop unless its rainy or something, they say it saves brakes for when you really need em. And their reverse isnt very loud to begin with.
Pilotpip From United States of America, joined Sep 2003, 3117 posts, RR: 11 Reply 5, posted (9 years 2 months 1 week 3 days 21 hours ago) and read 5001 times:
Modern carbon brakes work better when heated up, so you need to use them. Trans States has been ordering ERJs without TRs for about a year. It saves 700lbs and tons of maintinance. Reversers aren't taken into account for landing performance and they are just a bonus. Most modern autobrake systems are effective enough that many airlines are changing their procedures to simply deploying the reversers but not increasing thrust.
As far as strength, clamshells are usally considered the more effective (and louder) of the two types. As mentioned above, cascades only redirect the bypass flow. Clamshells redirect all of it.
XFSUgimpLB41X From United States of America, joined Aug 2000, 4101 posts, RR: 38 Reply 7, posted (9 years 2 months 1 week 2 days 15 hours ago) and read 4879 times:
The CRJ's reversers take so dang long to deploy that if I need to stop quickly by the time I finally get the reversers out and have been pretty heavily on the brakes, its already time to stow them because we'll already be passing below 80 knots. The brakes are very very effective, though idle reverse at high speed definitely has a nice effect.
Oly720man From United Kingdom, joined May 2004, 6517 posts, RR: 11 Reply 8, posted (9 years 2 months 1 week 1 day 23 hours ago) and read 4839 times:
The cascade reversers are just a series of curved vanes that direct the flow forward, or, depending on the design of the vanes, forwards and sideways. There are different designs of the vanes for different parts of the aircraft - near the fuselage, near the ground - where the flow direction might cause problems or damage.