tarzanboy
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How Do You Rotate A DC-9?

Tue Jul 13, 2010 7:49 pm

Are there any DC-9 drivers here? Have you ever flown the DC-9 30 or 50?

What is the rotation technique? I have seen some cockpit pictures of the PFD and the attitude pitch lines are graded in intervals of 5 degrees, so moving up from the horizon there are 2 bars and then a 15 degree bar labelled 15.

I have been searching online but could not find the answer to this question, at what pitch attitude angle would the DC-9 30 or 50 [not MD-80] have a tailstrike?
 
KELPkid
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RE: How Do You Rotate A DC-9?

Tue Jul 13, 2010 8:16 pm

I hear overloading the tail section (with ice or cargo) does wonders 
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Of course, this also leads to a tail strike...  
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tb727
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RE: How Do You Rotate A DC-9?

Tue Jul 13, 2010 8:47 pm

Easy, pull back on the yoke!

I'm not on the 9 but looking at the manual, a normal rotation is 3 degrees per second to the target all engine pitch attitude in one smooth motion. You will whack the tail at approx 11.5 degrees with the mains still planted on the ground.
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tarzanboy
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RE: How Do You Rotate A DC-9?

Tue Jul 13, 2010 11:13 pm

Tb727, hey - are you quoting from a DC-9 manual? Thanks dude.
 
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tb727
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 12:49 am

Quoting tarzanboy (Reply 3):
Tb727, hey - are you quoting from a DC-9 manual? Thanks dude.


Yep, right out of our manual.
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bohica
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 2:08 am

Quoting Tb727 (Reply 2):
Easy, pull back on the yoke!

Should the airplane be accelerating down the runway first?     
 
cobra27
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 7:13 am

I also wondered about Dc-9 rotation. I was scared it could be tailstrike

http://www.youtube.com/watch?v=Q3JPh7LRDaQ
 
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tb727
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 12:54 pm

Quoting bohica (Reply 5):
Should the airplane be accelerating down the runway first?

Yeah, preferably beyond Vr will give you the best chance at getting off the ground!
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pilotpip
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 8:19 pm

Quoting cobra27 (Reply 6):
I also wondered about Dc-9 rotation. I was scared it could be tailstrike

http://www.youtube.com/watch?v=Q3JPh...LRDaQ

You can tailstrike any aircraft if you aren't paying attention.
DMI
 
PGNCS
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 10:20 pm

I have flown every variety of DC-9 except the -20. Rotate at approximately 3 degrees per second. Two engine pitch for climbout will be around 13-18 degrees nose high depending on a host of conditions such as weight, temp, altitude, engines installed, etc. Too many specifics to generalize, but 15 degrees nose high is the normal two engine attitude plus or minus a couple of degrees, with single engine climbout attitude being maybe 4 degrees lower initially (12.5 is a common initial target). It is rather difficult but not impossible to get a tailstrike on takeoff in a DC-9, much harder than a 757 or 767-300 for instance.

I don't have my manual set handy (I am not currently flying the DC-9), but I recall that a tailstrike happens on takeoff at a tad more than 11 degrees pitch, which seems to square with what Tb727 is saying. If you rotate at the correct speed at 3 degrees per second you won't hit the tail.

There is absolutely nothing novel or unpredictable in the handling of the DC-9; rotation is entirely conventional.
 
Fly2HMO
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 10:28 pm

Quoting Tarzanboy (Thread starter):
How Do You Rotate A DC-9?

As has been said ad-nauseaum, there's nothing special about the take-off procedure for the DC-9s. And I've seen 3 deg. per sec. rotation rate quoted in AFMS and used as a rule of thumb in everything from a C150 to 737s and 777s


Bonus points to anybody who can come up with an airplane or two that would be very different from the norm   
 
tarzanboy
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 10:49 pm

Thanks for the further info PGNCS et al.

Hey Tb727, out of curiosity, if you don't fly the DC-9, where did you get the manual!?

Can regular non flyers buy flight manuals?

[Edited 2010-07-14 15:49:58]
 
vikkyvik
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 11:20 pm

Quoting Fly2HMO (Reply 10):
Bonus points to anybody who can come up with an airplane or two that would be very different from the norm

The B-52?

 
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PGNCS
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RE: How Do You Rotate A DC-9?

Wed Jul 14, 2010 11:40 pm

Quoting tarzanboy (Reply 11):
Can regular non flyers buy flight manuals?

I have no knowledge of this site or product, so buy at your own risk. I will post it here as it was obtained by a very quick Google search (there are many other similar offers out there):

http://www.flight-manuals.com/mcdonn...uglas-dc9-flight-handbook-tw9.html

I know nothing of this, but for older aircraft especially the manuals are frequently available, although are certainly not guaranteed to be current or used for aircraft operation.

Seek and ye shall find. There's a lot of stuff out there, and it varies dramatically in quality.

Quoting tarzanboy (Reply 11):
Thanks for the further info PGNCS et al.

You are most welcome!
 
bohica
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RE: How Do You Rotate A DC-9?

Thu Jul 15, 2010 12:02 am

Quoting Fly2HMO (Reply 10):
Bonus points to anybody who can come up with an airplane or two that would be very different from the norm

Harrier?

Someone else already said B-52.  
 
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tb727
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RE: How Do You Rotate A DC-9?

Thu Jul 15, 2010 12:51 am

Quoting tarzanboy (Reply 11):
Thanks for the further info PGNCS et al.

Hey Tb727, out of curiosity, if you don't fly the DC-9, where did you get the manual!?

I'm on the 72 but for whatever reason I get a copy of the DC-9 as well when we get revisions on CD, I think I just asked for it last time. I wouldn't give out my companies manuals because we are small and our name is all over it(plus I am pretty sure I am not allowed) but the site that PGNCS directed you to would probably be good enough for an avid aviation fan like yourself. For $17, that's pretty good for reference only.

[Edited 2010-07-14 17:52:07]
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Fly2HMO
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RE: How Do You Rotate A DC-9?

Thu Jul 15, 2010 2:14 am

Quoting vikkyvik (Reply 12):
The B-52?
Quoting bohica (Reply 14):
Harrier?

I was thinking of those two precisely.

However, in the harrier's case, a normal takeoff would be pretty conventional.

As for the B-52, well that thing just magically levitates tail first 
 
packcheer
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RE: How Do You Rotate A DC-9?

Fri Jul 16, 2010 3:24 pm

How different is the 764? or 753? or 739? Does that much added length mean slower rotation?

I do not as about Airbus becuase they appear to sit fairly high on their gear, I doubt they'd be in danger.
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Jetlagged
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RE: How Do You Rotate A DC-9?

Fri Jul 16, 2010 3:39 pm

This site has a large amount of operations manual info to download, including normal takeoff procedures. Unfortunately nothing on the DC-9, but there are sections on the 717 and MD80 which are closely related.

http://www.smartcockpit.com
http://www.smartcockpit.com/pdf/plane/boeing/B717/diagrams/0009/
http://www.smartcockpit.com/pdf/plane/boeing/MD-80/diagrams/0015/
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