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Climbout Rate  
User currently offlineCloudNine From United States of America, joined Apr 2001, 68 posts, RR: 0
Posted (11 years 6 months 1 week 5 days 18 hours ago) and read 2204 times:

I live in the midwest area of the U.S.,with a commercial airport that sees only a moderate amout of departures. I've noticed a number of Southwest(733) & American(MD80) aircraft Departing at what appears to be extreme angle's. My actual question is," what is the typical to extreme rate ft. per minute climbout for most commercial flights"?. In afterthought, how is the rate per minute of decent figured out on approach to you destination?. The later question is under typical or normal situations. Thanks, and hope I have'nt confused anyone.

8 replies: All unread, jump to last
 
User currently offlineB747Skipper From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 6 months 1 week 3 days 17 hours ago) and read 2140 times:

Dear Cloud9 -
xxx
The "maximum angle" for climb out on takeoff is generally 20 degrees for all airplanes that I know (and/or airline operation policies) - airlines refrain from "acrobatic flying" as you may realize... And 20 degrees, would be a faily light weight aircraft...
xxx
On a heavily loaded 747, the other extreme, the attitude angle is 13 degrees after takeoff for the initial climb speed...
xxx
So we say 12-13 degrees (heavy) and 20 degrees (light aircraft)...
xxx
Rate of descent, typical ILS is 750 to 800 feet/minute - visual approaches generally around these numbers, but could go to... say 1,000 feet/minute...
Happy contrails  Smile
(s) Skipper


User currently offlineRendezvous From New Zealand, joined May 2001, 515 posts, RR: 0
Reply 2, posted (11 years 6 months 1 week 2 days 14 hours ago) and read 2104 times:

Just another similar question...

I know this is very dependent on all the variables, but what sort of figure are we looking at for initial rate of climb on the 747 and 777?


User currently offlineMr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 22
Reply 3, posted (11 years 6 months 1 week 2 days 13 hours ago) and read 2096 times:

G'day Rendezvous,

Climb rates really depends on many many factors which include temperature, weight, thrust settings, speed... etc. For the B747-400, at light weights it should be 3000-4000fpm while at medium weights 2000 and heavy 1000fpm.

This is just a very very rough figure.

Cheers,

alvin

PS/Skipper is the man to ask when it comes to the B747s  Smile



Boeing747 万岁!
User currently offline411A From United States of America, joined Nov 2001, 1826 posts, RR: 8
Reply 4, posted (11 years 6 months 1 week 2 days 13 hours ago) and read 2100 times:

On the other hand, with older types (B707 for example), it can be rather interesting.
Recall departing DHA one night, max weight...and was only able to climb at V2/400 feet per minute, due to 20,000 pound error (found out later) in the loadsheet.
First Officer (pilot flying) had eyes big as dinner plates.
Sure glad one engine didn't quit..... Wow!


User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 5, posted (11 years 6 months 1 week 1 day 16 hours ago) and read 2063 times:

Regarding climbout rates... jet transport aircraft...
All that comes from FAR/JAR Part 25...
xxx
The "second segment climb" (gear retraction height until reaching 400 feet with one engine failed) is the "yardstick" for aircraft performance climbout rate in certification...
xxx
2 engine airplanes, i.e. a 737, must be able to maintain a climb gradient of 2.4%...
3 engine airplanes, i.e. a DC-10, be able to maintain a climb gradient of 2.7%...
4 engine airplanes, i.e. a 747, be able to maintain a climb gradient of 3.0%...
xxx
Based on that, you can see that a 2 engine aircraft would be inherently with much better "all engine" performance, since they are designed to climb with one engine out (one still operating) at a gradient of 2.4%... yet having lost half of their power... if you compare to a 3 engine (lost only 33.3% of its power), or a 4 engine aircraft, 25% of its power...
xxx
All airplanes climbing out on "all engines" have spectacular performance... yet I know that "twin jets" probably have the most spectacular climb capability...
xxx
Is this a help to answer your questions...?
Happy contrails  Smile
(s) Skipper


User currently offlineRendezvous From New Zealand, joined May 2001, 515 posts, RR: 0
Reply 6, posted (11 years 6 months 1 week 1 day 8 hours ago) and read 2022 times:

Yep thanks
I know it's a hard one to give an answer to, because of all the variables.
I can't imagine climbing out in a fully laiden twin on one engine is very fun. Most probably the pilot would require a change of pants after?



User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 7, posted (11 years 6 months 6 days 14 hours ago) and read 1966 times:

My airline's top executives sometimes use a Learjet for their travel, and I get occasionally to fly that aircraft... at sea level and average weight, this little rocketship is capable of climbing at 1,000+ feet per minute on one engine, and I have seen some 6,000 feet per minute on VSI with both engines...
xxx
Somewhat of spectacular performance, shall we say...  Smile
(s) Skipper


User currently offlineRendezvous From New Zealand, joined May 2001, 515 posts, RR: 0
Reply 8, posted (11 years 6 months 6 days 14 hours ago) and read 1962 times:

Now that must be fun!

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