Two interview questions
10-08-2007 | 05:39 PM
#3
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From: Engines Turn or People Swim
2) Generally you want less-dense air (less drag), which always means higher altitudes. But the tradeoff is that it at takes a lot of gas to climb to higher altitude, so on a shorter flight it may not be economical to burn the gas to get to F390 only to have to immediately start your descent. Also high-altitude winds play an important role. You may better of at F290 with a 30 kt headwind than that at F390 with a 130 Kt headwind.
These are typical CRJ altitudes (westbound, no unusual wind):
15 min flight: 16,000
30 min flight: F240
1 hour flight: F320
> 1 hour flight: F380
10-08-2007 | 05:44 PM
#4
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From: Spartan
1) In addition to what Joe said, a strong X-wind can be a factor.
2) Generally you want less-dense air (less drag), which always means higher altitudes. But the tradeoff is that it at takes a lot of gas to climb to higher altitude, so on a shorter flight it may not be economical to burn the gas to get to F390 only to have to immediately start your descent. Also high-altitude winds play an important role. You may better of at F290 with a 30 kt headwind than that at F390 with a 130 Kt headwind.
These are typical CRJ altitudes (westbound, no unusual wind):
15 min flight: 16,000
30 min flight: F240
1 hour flight: F320
> 1 hour flight: F380
2) Generally you want less-dense air (less drag), which always means higher altitudes. But the tradeoff is that it at takes a lot of gas to climb to higher altitude, so on a shorter flight it may not be economical to burn the gas to get to F390 only to have to immediately start your descent. Also high-altitude winds play an important role. You may better of at F290 with a 30 kt headwind than that at F390 with a 130 Kt headwind.
These are typical CRJ altitudes (westbound, no unusual wind):
15 min flight: 16,000
30 min flight: F240
1 hour flight: F320
> 1 hour flight: F380
10-09-2007 | 08:13 AM
#5
Prime Minister/Moderator
Joined: Jan 2006
Posts: 44,886
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From: Engines Turn or People Swim
10-09-2007 | 08:35 AM
#6
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From: Spartan
I never liked to take the -200 over 300 unless it was winter. Never flew the -900 but the 700 had no problem up high and was actually a nice ride.
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