Hi,
I try to do the questions with the performances charts of the Dash8 in the Aerocourse fourth edition, but I don't understand the calculations. These charts talk about the torq, the weight and runway distance...
Anybody could help me,
thank,
NL
dash 8 perf charts from Aerocourse
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nicky larson
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Okay I'm bored, and I need the practice!
The answer may be found by thinking that sometimes a tailwind t/o is preferential.
Q29:
Head/Tail Wind component calculates to around 6kts.
QNH is higher than standard, no correction.
For RNWY 15 the corrected weight totals 31,390lbs (31,780 + 25lbs/kt*6kts)
For RNWY 33 the corrected weight totals 33,840lbs (34,200 - 60lbs/kt*6kts)
The red herring is the assumed runway into the wind of 31,390lbs, an actual figure listed as an option.
However, they asked the maximum allowable t/o weight which in this case is the tailwind takeoff. Obviously a function of the slope, but may be influenced by clearway and v2 performance (not identified in the tables, but taken into consideration when developing them). The answer is therefore the closest value and that would be (b) (the conservative side of the figure calculated).
The answer may be found by thinking that sometimes a tailwind t/o is preferential.
Q29:
Head/Tail Wind component calculates to around 6kts.
QNH is higher than standard, no correction.
For RNWY 15 the corrected weight totals 31,390lbs (31,780 + 25lbs/kt*6kts)
For RNWY 33 the corrected weight totals 33,840lbs (34,200 - 60lbs/kt*6kts)
The red herring is the assumed runway into the wind of 31,390lbs, an actual figure listed as an option.
However, they asked the maximum allowable t/o weight which in this case is the tailwind takeoff. Obviously a function of the slope, but may be influenced by clearway and v2 performance (not identified in the tables, but taken into consideration when developing them). The answer is therefore the closest value and that would be (b) (the conservative side of the figure calculated).
