NYC Int'l From , joined Dec 1969, posts, RR: Posted (14 years 2 months 2 days 7 hours ago) and read 1227 times:
Can anyone give me advise on how to properly use flaps in FS'98. When I first got FS'98 I used to put down full flap when landing. I no longer do that but I am not sure how or when to use them. I also have a question why do pilots use flap on t/o when they are on a long runway?
British Airways From , joined Dec 1969, posts, RR: Reply 1, posted (14 years 2 months 2 days 7 hours ago) and read 1226 times:
You do not use flaps on take off if the runway is long anuff.
And you use you flaps if you are high or fast and you use them accordingly. When you are turning final you ask yourself too high too low too fast too slow.
Then if you come up with
either fast or high or both you put in flaps as needed.
MD-11 From , joined Dec 1969, posts, RR: Reply 2, posted (14 years 2 months 2 days 7 hours ago) and read 1226 times:
Kind of depends on what plane you use. I think Iain is talking about flap usage on a Cessna or similar. If you are using an airliner, they lower flaps as needed as they slow down. They have certain speeds at which to apply flaps progressively until they are full down.
Jetstar II From , joined Dec 1969, posts, RR: Reply 6, posted (14 years 2 months 2 days 2 hours ago) and read 1227 times:
Again....different settings for different aircraft.
The Jetstar that I fly will have alot of problems getting off the ground without the flaps and leading edge slats extended to the takeoff position...regardless of runway length.
On landing we use all available flaps. It steepens the approach so your view over the nose is better. Also slows the airplane down so we use less runway.
Dash8 From New Zealand, joined Aug 2005, 1 posts, RR: 0 Reply 7, posted (14 years 2 months 2 days ago) and read 1227 times:
OK, Iain I have to say tha MD-11 is right. Flap deployment has only to do with speed. It doesn't matter if you're a Cessna or a 747. Because Cessna's have straight, non-critical wings high lift devises aren't ABSOLUTELY necesarry.
Ask this, if you landing your Cessna on a 1000 fot long runway and you're a bit too low, are you gonna use your flaps to land? You better because otherwise you're gonno go off the other end. That is the MAIN purpose of flaps. Of course there aren't many 1000 foot long runways and a Cessna is so light that use of flaps on landing only makes a couple of hundred feet difference, so here they're mainly used as speed brakes. But look at a jetliner. The supercritical wingshape they have means that tyey're most efficient at high speeds. When landing a 747 with no flaps means to come in at I would guess about 220 knots!!! Flaps increase the lift capability of this wing. And that is it. If ATC gives a 747 a very early descent and asks it to maintain f.e. 170 knots. It better use flaps because otherwise it'll come crashing down.
As for take-off Jetstar is right. A 747 at 650000 lbs lifts off at 150 knots with flaps at 10, but only at 140 with flaps 20. Thats a whole lot of difference at that speed.
British Airways From , joined Dec 1969, posts, RR: Reply 8, posted (14 years 2 months 1 day 23 hours ago) and read 1230 times:
I am going to say that you are wrong. If you are coming in on final and fast and low are you going to put flaps down and increse your rate of decent (I hope not) Or trade airspeed for Altitude. Also you said that if I was a bit low I better put in flaps. I would never put in flaps for just being low. You pitch for path and power for airspeed. So as you said in your opening statement flaps only have to do with speed. So if I was low I would bring my nose slightly higher and add my power in a bit for the loss of airspeed.
Dash8 From New Zealand, joined Aug 2005, 1 posts, RR: 0 Reply 9, posted (14 years 2 months 1 day 22 hours ago) and read 1227 times:
Iain PLEASE listen to me. I've studied advanced aepodynamics and I know all about this.
Flaps have to do with lift, angle of attack and thus airspeed. The more lift you have, the slower you can go before you stall. If your Cessna operating handbook says you can land a 172 in f.e. 1200 feet with flaps up and 800 feet with flaps full why do YOU think that is !!!!! It's because you can fly a slower approach speed !!! Flaps were NOT built as speed brakes.
And I didn't say ANYTHING about being fast. I asked you if you were low on landing on a 1000 foot long runway are you not gonna use flaps?
You better use flaps because you cant land even a 172 with flaps up on a 1000 foot long runway !!! Your approach speed is gonna be too high.......
British Airways From , joined Dec 1969, posts, RR: Reply 10, posted (14 years 2 months 1 day 21 hours ago) and read 1227 times:
I know that flaps slow you down. But you did say you where low on your last post.
Also you are on final and too high. What do you do?
Well You pitch you nose down to get back on to a nice glide path but if you do that your going to go faster. So you put in some flaps to slow you down to get a steeper approach to the runway so you will not over shoot the runway like you would of as you where to high.
This is what I have been saying all a long.
Dash8 From New Zealand, joined Aug 2005, 1 posts, RR: 0 Reply 11, posted (14 years 2 months 1 day 19 hours ago) and read 1228 times:
So what does a 747 that's too high with full flaps at 160 knots do ?????????
Or what does a Cessna that needs to land on a very short runway do (Flaps are already full because otherwise his approach speed will be too high for such a runway!) ???????
British Airways From , joined Dec 1969, posts, RR: Reply 12, posted (14 years 2 months 1 day 19 hours ago) and read 1227 times:
Well you still have power.
In a Cessna 100 RPM's is about about 5 knots so you will pitch your nose down and pull your power back anuff to maintain your approach speed.
In a 747 you will do the same point your nose down and decrease power.