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Why Is The CRJ-200 Such A Runway Hog?  
User currently offlineBeechbarron From United States of America, joined May 2000, 134 posts, RR: 0
Posted (12 years 7 months 2 weeks 6 days 19 hours ago) and read 3865 times:

Hey guys. I've noticed here in ATL that CRJ-200's of ASA use almost as much runway as a 727-200 to get airborn. What gives? They have an awesome thrust to weight ratio!

13 replies: All unread, jump to last
 
User currently offlineMandala499 From Indonesia, joined Aug 2001, 6895 posts, RR: 76
Reply 1, posted (12 years 7 months 2 weeks 6 days 17 hours ago) and read 3734 times:

No front slats... Which requires a faster take off speed, hence longer runway.

The CRJ700s have front slats, and takes off quicker that the 200s!

Mandala499



When losing situational awareness, pray Cumulus Granitus isn't nearby !
User currently offlineC172Akula From Canada, joined Mar 2001, 1003 posts, RR: 4
Reply 2, posted (12 years 7 months 2 weeks 6 days 15 hours ago) and read 3697 times:

I remember leaving Salt Lake about a year ago, I was coming back to Calgary after ferrying a plane down to Denver. That CRJ just didn't want to leave the ground in any real hurry, but other than that I quite enjoyed the flight. Although I miss Delta flying into YYC, a RJ is pretty small for a 2 1/2 hour flight.

User currently offlineSkystar From Australia, joined Jan 2000, 1363 posts, RR: 3
Reply 3, posted (12 years 7 months 2 weeks 6 days 12 hours ago) and read 3640 times:

The lack of slats also explains the strange nose down approach attitude of the CRJ-100/200

Cheers,

Justin


User currently offlineDash8King From Canada, joined Nov 2001, 2743 posts, RR: 11
Reply 4, posted (12 years 7 months 2 weeks 6 days 9 hours ago) and read 3615 times:

I am hear to learn so, what are slats?

User currently offlineZiggy From United States of America, joined Jun 2001, 178 posts, RR: 0
Reply 5, posted (12 years 7 months 2 weeks 6 days 9 hours ago) and read 3615 times:

Slats pertain to the leading edge of the wing and the capability of them being raised flush with the wing or lowered to create more airflow over the top of the wing. Basically think of flaps for the front of the wing.

Ziggy  Smile


User currently offlineBuckfifty From Canada, joined Oct 2001, 1316 posts, RR: 20
Reply 6, posted (12 years 7 months 2 weeks 6 days 7 hours ago) and read 3568 times:

The lack of slats also contributes to the 200's susceptibility in icing conditions (like the Fokkers). Strange, for a plane that is designed in Canada...

User currently offlineNfx From Germany, joined Oct 2001, 179 posts, RR: 0
Reply 7, posted (12 years 7 months 2 weeks 6 days 5 hours ago) and read 3555 times:

what about the BAe146/Avro RJ...

it also approaches with an "nose down" attitude.
can i assume it also doesn`t have slats?


User currently offlineKohflot From , joined Dec 1969, posts, RR:
Reply 8, posted (12 years 7 months 2 weeks 6 days 4 hours ago) and read 3560 times:

The CRJ isn't any less capable in icing conditions than any other jet aircraft with a bleed air anti-ice system, as long as ice stays off the wing. You might have a bigger problem on your hands if it does start accumulating, but as long as everything's working right there's no problem.

I also don't think the CRJ has an issue with takeoff speeds. The airports y'all have mentioned (ATL, SLC) have nice long runways. That being the case, the crew can choose a lower thrust setting for takeoff.. which reduces the stress on the engines, but also makes for a longer takeoff roll. If the plane is operating out of shorter fields, they'll pick a higher setting and use less space. This is just a generalization and there are other factors that affect takeoff distance (temperature, density altitude, wind, etc.).. You also mentioned a hot airport and a hot-and-high airport. Any plane will have a longer takeoff roll from those places.

Landing is what's real fast on the airplane, and yes.. the plane does have the tendency to at least appear that it's pitching down on final approach. Some people joke that the plane is just flown into the ground with the gear down..

The fact (or in some cases, perception) that the CRJ has issues with takeoff/approach speeds and icing is due to the fact that the it has what's called a "critical wing". It's kind of a fancy term, but can be boiled down to this.. it's critical to keep a good, steady flow of air over it. The wing is thin, and rather skinny.. as a result, it's great in the cruise.. nice and fast. The problem is the smaller surface size means it requires more airflow to do the same job a larger wing can do with less. As mentioned earlier, slats would help quite a bit in slowing the plane down on approach, but it's still got that little, skinny wing that wants a lot of wind to do its job.


User currently offlineBeechbarron From United States of America, joined May 2000, 134 posts, RR: 0
Reply 9, posted (12 years 7 months 2 weeks 5 days 21 hours ago) and read 3516 times:

Thanks guys, that helps. Still though, I wonder why Canadair didn't design the wing w/ slats? After all, it is a regional jet and they fly into many small airports.

User currently offlineCV640 From United States of America, joined Aug 2000, 952 posts, RR: 5
Reply 10, posted (12 years 7 months 2 weeks 5 days 19 hours ago) and read 3499 times:

The reason for no slats was to keep the wing as efficient and clean as possible. even with slats flush they do give some drag, os that was the main reason. As for runway requiremenst, they aren't that bad. Landing requiremenst are actually quite short. As for take off, yes at heavier weight it can be quite long, but we routinely fly them in and out of 6000 (even a few slightly shorter) foot strips with ful loads, although we couldn't go at the aircrafts max range.

User currently offlineDash8King From Canada, joined Nov 2001, 2743 posts, RR: 11
Reply 11, posted (12 years 7 months 2 weeks 5 days 9 hours ago) and read 3466 times:

Ok I remember what your talking about, can't believe I forgot!!

User currently offlineATA L1011 From United States of America, joined Feb 2001, 1384 posts, RR: 6
Reply 12, posted (12 years 7 months 2 weeks 5 days 9 hours ago) and read 3465 times:

No the Bae146/Avro doesnt have slats/leading edge either.


Treat others as you expect to be treated!
User currently offlineTwa902fly From United States of America, joined Dec 1999, 3128 posts, RR: 4
Reply 13, posted (12 years 7 months 2 weeks 4 days 16 hours ago) and read 3423 times:

the nose down approach is really awesome. Ive done that into LIT, ORD and IAD on a CRJ and its awesome to look out the window pointing down until abotu 20 seconds before touchdown.

TWA902



life wasn't worth the balance, or the crumpled paper it was written on
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