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Old 02-06-2011, 04:37 AM   #1  
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Default Takeoff Question

if an airplane takes off at 100 knots in 1100 feet with no head wind or tailwind . how long is the takeofff distance in a 25 knot headwind .
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Old 02-06-2011, 04:57 AM   #2  
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825 feet. I know I'm probably wrong, but I took 75% or the original 1100.
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Old 02-06-2011, 06:17 AM   #3  
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You need to consult a generalized headwind tailwind landing distances plot. FAA-H-8083-25 "PHAK" has one.
In this case we have a 25-knot headwind which equals 25% of the speed for the no-wind takeoff. Using the plot, we get a 42% reduction in takeoff distance, or 462 ft discount. Takeoff distance in this headwind will be 638 ft. Your mileage may vary, always use the POH in real life. This is just to get an idea what the trade off is.

[edit] That sounded kind of generous to me so I looked up some headwind discounts in a few of my POHs I found it to be a bit optimistic in comparison to real values. Probably more like 10-15% discount on takeoff distance per 10 knots of headwind.

Last edited by Cubdriver; 02-06-2011 at 06:31 AM.
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Old 02-06-2011, 07:46 AM   #4  
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Default Climb rate?

how is an aircraft's rate of climb affected if more luggage is added to its cargo ? how is stall affected .
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Old 02-06-2011, 08:16 AM   #5  
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Jet, I am getting a little suspicious of what you are up to. This is your fourth question this week and they all sound like basic aviation school questions. Getting unstuck on occasion on the one hand, and freeloading brain cells from the internet to avoid having to think are two different things. Try to solve the problems yourself first, and then if you have some doubts then make a question aimed at exploring what the area of uncertainty is. Homework problems are not unwanted nuisances, they are an opportunity to learn things that will save your butt later. You need to work them.
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Old 02-06-2011, 08:44 AM   #6  
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<disregard>

Last edited by FlyerJosh; 02-06-2011 at 10:00 PM.
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Old 02-06-2011, 09:08 PM   #7  
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that's my dad he is overseas in middle east for the last 11 months and I'm in my frist month of flight traning . he helps when he can from skype but he can only help when he can call due to the job . I did not mean to upset you all and my dad was only looking for help for me to understand things better also the four questions are the one's I did not understand out of the 50 questions I had I got four wrong and was looking for some help and better understanding . and my dad took it upon his self to try this site to get some answers for me . for the record my dad works hard to help me the best he can and I proud of him even if some of you all say a 777 pilot should know this when even some other pilots did not even know some of the answers to my questions and one guy was a chief pilot on a G450 I ask at the airport in longbeach . so it goes to show it's not as easy as some my think . but I respect all you that helped thanks to you all I got 11 hours of flight time and a lot go
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Old 02-06-2011, 09:45 PM   #8  
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Quote:
Originally Posted by 698jet View Post
how is an aircraft's rate of climb affected if more luggage is added to its cargo ? how is stall affected .
The heavier the airplane, the less the performance. Stall speed will be higher; rate of climb, slower. Think of jogging up a hill pulling a wagon with some bricks in it; now add more bricks. Your trip up that hill will be a lot slower.

A number of other factors besides weight affect performance: temperature, altitude, humidity to name a few. Just hit the books and keep asking questions. There's no such thing as a stupid question, just stupid answers.
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Old 02-06-2011, 09:52 PM   #9  
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Quote:
Originally Posted by 698jet View Post
how is an aircraft's rate of climb affected if more luggage is added to its cargo ? how is stall affected .
The next question would also be where is the cargo bin. If the CG is shifted significantly by the cargo addition that would cause changes in the flight characteristics and stall behavior of the airplane.

I have found one of the most interesting configurations in turbojet aircraft is light weight with CG at or close to the aft limit.
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Old 02-06-2011, 10:01 PM   #10  
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698, Fair enough. And good on your for asking. Sorry I was snippy earlier! Call it a long day combined with the fact that I didn't realize you were sharing an account.
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