Takeoff Question
#3
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.
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.
#5
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.
#7
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
#8
Gets Weekends Off
Joined APC: Jan 2009
Position: Nice while it lasted
Posts: 326
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.
#9
Gets Weekends Off
Joined APC: May 2009
Position: pilot
Posts: 584
I have found one of the most interesting configurations in turbojet aircraft is light weight with CG at or close to the aft limit.
Thread
Thread Starter
Forum
Replies
Last Post