beechbarron
Posts: 132
Joined: Tue May 23, 2000 9:46 am

Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 2:17 am

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!
 
mandala499
Posts: 6460
Joined: Wed Aug 29, 2001 8:47 pm

RE: Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 4:29 am

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 !
 
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c172akula
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RE: Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 5:54 am

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.
 
Skystar
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RE: Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 8:39 am

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

Cheers,

Justin
 
Dash8King
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Joined: Wed Nov 21, 2001 8:45 am

RE: Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 11:34 am

I am hear to learn so, what are slats?
 
Ziggy
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RE: Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 12:05 pm

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
 
buckfifty
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RE: Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 2:17 pm

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...
 
nfx
Posts: 172
Joined: Mon Oct 08, 2001 2:52 am

RE: Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 3:46 pm

what about the BAe146/Avro RJ...

it also approaches with an "nose down" attitude.
can i assume it also doesn`t have slats?
 
Kohflot
Posts: 941
Joined: Wed Sep 29, 1999 5:31 am

RE: Why Is The CRJ-200 Such A Runway Hog?

Fri Feb 15, 2002 4:45 pm

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.
Ask why..
 
beechbarron
Posts: 132
Joined: Tue May 23, 2000 9:46 am

RE: Why Is The CRJ-200 Such A Runway Hog?

Sat Feb 16, 2002 12:02 am

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.
 
cv640
Posts: 843
Joined: Wed Aug 30, 2000 8:10 pm

RE: Why Is The CRJ-200 Such A Runway Hog?

Sat Feb 16, 2002 1:45 am

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.
 
Dash8King
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Joined: Wed Nov 21, 2001 8:45 am

RE: Why Is The CRJ-200 Such A Runway Hog?

Sat Feb 16, 2002 11:51 am

Ok I remember what your talking about, can't believe I forgot!!
 
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ATA L1011
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RE: Why Is The CRJ-200 Such A Runway Hog?

Sat Feb 16, 2002 12:00 pm

No the Bae146/Avro doesnt have slats/leading edge either.
Treat others as you expect to be treated!
 
TWA902fly
Posts: 2871
Joined: Fri Dec 31, 1999 5:47 am

RE: Why Is The CRJ-200 Such A Runway Hog?

Sun Feb 17, 2002 5:13 am

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
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