Mesaba Future
#71
I agree with most of what you are saying except CRJ900 and E175s do not have same engines. CRJ900 NWA ordered for us is an enhanced NextGen version that has 19,450 lbs thrust per side where as E175 only has about 14,500 lbs thrust per side and E175 is heavier and has more drag because it is wider and has engines mounted under the wings. CRJ900 can outclimb and is definitely faster, but is only about 15% more fuwel efficient, I believe. 30% seems little too high.
#72
Oddly enough, we were never required to know how much thrust the engines put out for our oral since fadec calculates it based on ambient temp and pressure. But the 19.5K did seem very off to me. So I got out my systems manual...the big green binder manual. On the first page of the powerplant section (20-10-1). I will retype the introduction paragraph word for word...
"The airplane is equipped with two General Electric CF34-8C5 high bypass ratio turbofan engines which have a normal take-off thrust rating of 13,600 pounds. The engines are controlled by a full authority digital engine control system (FADEC). In the event of an engine failure during takeoff, an automatic power reserve (APR) function of the FADEC, will increase the thrust on the remaining engine to 14,510 pounds."
What Jetjock said...I do believe you are quoting the fuel capacity which is just shy of 20K but there is no way the engines are putting out that much power.
"The airplane is equipped with two General Electric CF34-8C5 high bypass ratio turbofan engines which have a normal take-off thrust rating of 13,600 pounds. The engines are controlled by a full authority digital engine control system (FADEC). In the event of an engine failure during takeoff, an automatic power reserve (APR) function of the FADEC, will increase the thrust on the remaining engine to 14,510 pounds."
What Jetjock said...I do believe you are quoting the fuel capacity which is just shy of 20K but there is no way the engines are putting out that much power.
#73
Now get back to the original question.
#75
It’s just doesn’t make any sense and it’s not backed up anywhere. I still think you heard wrong or they heard wrong. Without proof (that I or anyone else can find) it seems to not be so.
Although, oddly enough, your 19,450 lbs of thrust matched up perfectly with the CR9’s 19,450 lbs of fuel.
Good day and we just want facts, not "he said she said" hear say.
#77
#78
Gets Weekends Off
Joined APC: Jul 2007
Position: 737 Right
Posts: 121
Does anyone know if there is any noticeable difference in the 900 and the 900ng in fuel burn with I believe a little more wing area and redesigned winglet. I'm assuming the majority of change is within the cabin but figured I'd throw it out there
#79
The 175 vs. CR9 efficiency/size/comfort/this seat that seat is a BS debate. But the statement about the NG’s producing 19,450 lbs of thrust is not. If the NG’s do produce almost 1/3 more thrust (almost 5000 lbs more) than the older CR9’s then I’d like to know if it’s true. After flying our CR9’s with 14,501 lbs of thrust for over 1000 hours and enjoying their performance I can’t imagine them with 5000 lbs more thrust. That would be incredible, you’d be able to fully pack one out and maintain 4000 fpm all the way to FL410.
Now I know that our CR9’s are around 15% more fuel efficient than the E-175 which has the same engines and weights more. I know that the CR9 is very comfortable when configured with 76 seats and cramped with 86 (mesa). I know the E-175 is even more comfortable than the CR9. But to think that the CR9NG has 5000 lbs more thrust and still 15% more fuel efficient than the E-175? That’s a technological breakthrough in engine design.
No fighting and no name calling. BTW, I hope he's right because that would be great for all of us if you really think about the break through 5000 lbs of more thrust with the same fuel burn would be and what it could/would do for you industry and our futures. Sadly I see no proof.
Now I know that our CR9’s are around 15% more fuel efficient than the E-175 which has the same engines and weights more. I know that the CR9 is very comfortable when configured with 76 seats and cramped with 86 (mesa). I know the E-175 is even more comfortable than the CR9. But to think that the CR9NG has 5000 lbs more thrust and still 15% more fuel efficient than the E-175? That’s a technological breakthrough in engine design.
No fighting and no name calling. BTW, I hope he's right because that would be great for all of us if you really think about the break through 5000 lbs of more thrust with the same fuel burn would be and what it could/would do for you industry and our futures. Sadly I see no proof.
Last edited by JetJock16; 08-12-2008 at 02:24 PM.
#80
My postings have ABSOLUTELY nothing to do with any airline and there is/was no mudslinging; you are ready something into nothing my friend.
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