CRJ200 Questions

Trip7 said:
BAD BAD idea on RNAV departures
Click to expand...

Yes, I agree it could probably bite you on the butt. When I flew with him, it was when we were getting a vector to intercept the RNAV departure, and by that time "hook" had been bypassed and it was small turns to the transition. Otherwise I would have said something.
 
PGT said:
Why does the switchover to mach/ 1/2 bank occur at 31,600 feet?
Click to expand...

It's kinda trivial but I believe the switchover is made here because of the metric system; it is approximately 10,000 meters. Why that? Not sure, guess they just wanted an even number that was high enough to logically necessitate the use of 1/2 bank.
 
granlistillo said:
I flew with a guy that routinely selected it for passenger comfort AP engaged. On an RNAV departure, I am not sure that it is a good idea, if you want to stay on the blackline...
Click to expand...


Same here. Soft Ride/Turbulence Mode and 1/2 Bank always.
 
CamYZ125 said:
I've never selected 1/2 bank on an RNAV departure.. does anyone know if the FMS/FD realizes half bank is selected and begins the turn earlier (in order to remain on the RNAV track), or if you just blow through the turn?
Click to expand...

In theory, it SHOULD know you're 1/2 bank and compensate. I might try it on a normal "Intercept J29" this weekend just to verify. If you're intercepting a LOC, however, it'll clear 1/2 bank when it captures.

TURB mode, a lot of times, is sorta useless. I HAVE found that if you're in SPD mode, go through 10K and select 290 kts, if you hit TURB mode, it'll actually pitch at a NORMAL rate to accelerate rather than diving for the speed.
 
In regards to the 1/2 bank switchover at 31,600...

stratoduck pretty much hit the nail on the head. Nothing to do with about 10,000 meters or some pretty number, but performance of the airplane and wing.

31,600 was determined to be the "critical" altitude where the wings could potentially start having issues if 1/2 bank was not used.

Additionally, (according to my source) 1/2 bank does not compensate and will turn wide on RNAV procedures.
 
ctab5060X said:
Additionally, (according to my source) 1/2 bank does not compensate and will turn wide on RNAV procedures.
Click to expand...


What's the source? I honestly don't know, but reading the rather lacking systems manual we have, it sounds like it will anticipate the turn knowing it's 1/2 bank.
 
kellwolf said:
What's the source? I honestly don't know, but reading the rather lacking systems manual we have, it sounds like it will anticipate the turn knowing it's 1/2 bank.
Click to expand...

Went to CKB last night... that should give you the source.

I wonder about it as well... I think it can handle small course changes... it would have too for anything about 31,600, but maybe the sharper turns that some RNAV departures initially have give it problems. :dunno:

Next time you fly, try the 1/2 bank when interecepting an airway... eager to hear what it will actually do.
 
Still there is the question of why 31,600. Is 31,700 just pushing it a little too far?

Looks like a mathematically derived number. I'd really enjoy the history.
 
ctab5060X said:
Went to CKB last night... that should give you the source.
Click to expand...


I can guess. And if it's the same guy, he took off from CKB the other night missing some galley pieces. MX had to scramble to find them on a plane in the hangar so we could leave....


That being said, he's probably right. :) I'll check it next time I fly.
 
C150J said:
1/2 bank does compensate for RNAV tracks in our RJs. It will lead turns.
Click to expand...
That sounds ok with a flyby waypoint, but if it is a flyover waypoint you might go a little wide. They really want you on the line, i´m guessing it will hold you in RNP requiremnt, but common sense says if it is for passenger comfort, when you are in the portion of an RNAV with a lot of acute turns, common sense says don´t do it half bank. That was my original point.
 
At OH we use 1/2 bank when we are below Vref. 31,600 comes directly from Bombardier as that was what the test pliots/engineers thought where control could become an issue if one was hand flying. I had a 32 hour layover in YUL last year and did a tour of the Bombardier factory. I had a bunch of questions about the CRJ-100/200. Anyone want to guess why the windows suck on the CRJ 200? Or why the CRJ 700/900 is slanted nose down? Why aren't there any leading edge devices on the CRJ 100/200?
 
The 700/900 is slanted down because if the MCD was any higher it would require a slide.

As to the other 2 questions I have no idea unless it's simply because it stems from the Challenger design.
 
Never flew the plane, but I've heard the lore. Let's see how stuff floating around, we'll call it the "collective conscious" stacks up:

Soul Brotha' said:
Anyone want to guess why the windows suck on the CRJ 200?
Click to expand...

I'd say the windows don't suck, it's the CRJ. The rumor is the Challenger floor got raised to fit 4 across.

Why aren't there any leading edge devices on the CRJ 100/200?
Click to expand...

Since they stretched a Challenger, it's probably the same wing.

My turn:

Who designed the Challenger and what was it's initial name?

Who was it designed for?
 
Soul Brotha' said:
At OH we use 1/2 bank when we are below Vref. 31,600 comes directly from Bombardier as that was what the test pliots/engineers thought where control could become an issue if one was hand flying. I had a 32 hour layover in YUL last year and did a tour of the Bombardier factory. I had a bunch of questions about the CRJ-100/200. Anyone want to guess why the windows suck on the CRJ 200? Or why the CRJ 700/900 is slanted nose down? Why aren't there any leading edge devices on the CRJ 100/200?
Click to expand...

How did you get the info to do a tour?
I'd be interested in checking that out sometime, but i have yet to have a long enough layover there in a long time.

Then again....i'm sure in winter i will be paged to be there alot. But it would be nice to have something else to look forward to.
 
You must log in or register to reply here.
Back
Top