Who flies faster: AC's A320 vs WJ's B737-700
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But what really counts for us passengers is getting there as quickly as possible. I've flown with AC and WJ many times when they have made very clever diversions to get around unfavourable winds and landed ahead of schedule.
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Back to topic...
A WJ -700 or -600 will usually be between .77 and .79, faster into a headwind, and if it's heavier. The -8's are usually .79ish since they are heavier and the computer figures faster is closer to best l/d speed.
These speeds are when you are close to OPT alt (more than 2k below and it will slow you down. If you are in the yz-ow-ul triangle, down in the low 30s, then expect the computer to spit out a palty .71 to .73 due to the low cost indices we use. (22-24 mostly, higher in the US, I think we use 32 outta LAX).
We are supposed to descend at the FMC computed speed, which is usually in the range of 265 kts... If there is a reason, we can alter this speed. I have noticed that when ATC requests a higher transition speed, in the range of 290 kts or so, it usually ends up saving both time and gas. We aren't supposed to alter this speed, unless there is a reason. I usually have someone on my tail, ifyouknowwhatImean...
The FMC computed climb and cruise speeds show evidence of being optimized for TOC wind and GW, the descent speed appears to be purely a function of cost index. Apparently this is under review with Boeing. Yes, I am a big fat nerd, and pay attention to this sh!t.
Jerricho: You worked our WJ flight into YWG last week, onto 13, coming from YYZ. You cut us loose abeam the beacon at 40k, we peeled it in as close as "noise" would let us. Thanks. I don't think a PA31 would have caught us on that one (FDM and SOP were honoured btw
) However, we were at 60k off the end of 13 on departure before you let us go westbound to YXE. I'm sure there was a good reason. You're the dude with the Kiwi accent, right? How did you get over 1 million posts?
Cheers
These speeds are when you are close to OPT alt (more than 2k below and it will slow you down. If you are in the yz-ow-ul triangle, down in the low 30s, then expect the computer to spit out a palty .71 to .73 due to the low cost indices we use. (22-24 mostly, higher in the US, I think we use 32 outta LAX).
We are supposed to descend at the FMC computed speed, which is usually in the range of 265 kts... If there is a reason, we can alter this speed. I have noticed that when ATC requests a higher transition speed, in the range of 290 kts or so, it usually ends up saving both time and gas. We aren't supposed to alter this speed, unless there is a reason. I usually have someone on my tail, ifyouknowwhatImean...
The FMC computed climb and cruise speeds show evidence of being optimized for TOC wind and GW, the descent speed appears to be purely a function of cost index. Apparently this is under review with Boeing. Yes, I am a big fat nerd, and pay attention to this sh!t.
Jerricho: You worked our WJ flight into YWG last week, onto 13, coming from YYZ. You cut us loose abeam the beacon at 40k, we peeled it in as close as "noise" would let us. Thanks. I don't think a PA31 would have caught us on that one (FDM and SOP were honoured btw
) However, we were at 60k off the end of 13 on departure before you let us go westbound to YXE. I'm sure there was a good reason. You're the dude with the Kiwi accent, right? How did you get over 1 million posts?Cheers
Last edited by roadbiker; 28th Aug 2006 at 19:46. Reason: slippery fingers
Ohcirrej
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KIWI ACCENT!!!!!!!!!
Grrrrrrrr.............
As to your YXE leg, my memory ain't that good. Of course, I must have had a good reason There wasn't a Jazz in your way perchance?
Grrrrrrrr.............
As to your YXE leg, my memory ain't that good. Of course, I must have had a good reason
There wasn't a Jazz in your way perchance?
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Mea Culpa
Ack, it's hard to tell subtle accent differences over a 5 1/2 year old Telex headset that sorely needs replacing. My sincere apologies.
(great, now every WJer'll get a vector to freakin' Thomson before they're allowed in...)
No Dash in our way that I know of, though our fishfinder is limited to traffic +/- 2700 ft of our current altitude so there coulda been something we didn't see.
Not a biggie, I'm sure there was a valid reason, I'm just busting your balls.
(great, now every WJer'll get a vector to freakin' Thomson before they're allowed in...)
No Dash in our way that I know of, though our fishfinder is limited to traffic +/- 2700 ft of our current altitude so there coulda been something we didn't see.
Not a biggie, I'm sure there was a valid reason, I'm just busting your balls.
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Thanks everyone for the informative replies, esp. zzjayca, roadbiker and meaw! who hit the nail on the head. You've answered my question, and then some 
I was just trying to get an idea as to what the typical LD cruising speeds (mach) are for each bird (as possibly dictated by the SOPs for AC and WJ)... not a "My dog's still bigger than yours" or a physics debate over winds aloft, temps affecting mach etc etc (Willie Everlearn). Of which, Willie, you made me have a good chuckle. And quite frankly, I have a cat that would shred your dog. 
I was just trying to get an idea as to what the typical LD cruising speeds (mach) are for each bird (as possibly dictated by the SOPs for AC and WJ)... not a "My dog's still bigger than yours" or a physics debate over winds aloft, temps affecting mach etc etc (Willie Everlearn). Of which, Willie, you made me have a good chuckle.
And quite frankly, I have a cat that would shred your dog.
.
