747400sp
Topic Author
Posts: 3900
Joined: Sat Aug 09, 2003 7:27 pm

DC-8 80/ Noe?

Sun Feb 20, 2011 3:42 pm

Let's say a there a DC-8 fan with a very large bank account, and he wanted to up date some DC-8 73s by replacing their four CFM 56-2 with four Pratt & Whittney P1000G, and he also changing their cockpit to two man cockpit, could it work? Douglas planes are know for their long life, heck there are still DC-3 flying around, and the last DC-3 was built in the 40's. So could a DC-8 83 work?
 
connies4ever
Posts: 3393
Joined: Sat Feb 25, 2006 10:54 pm

RE: DC-8 80/ Noe?

Sun Feb 20, 2011 4:02 pm

I think technically it could be done, but the reason the 'Lead Sled' has lasted as long as it has is that the airframe itself is very robust, which is a polite way to say it has a weight problem. Which means the economics would probably at best be marginal going forward into $100+ oil. Even with Pure Power.

Still, an interesting idea.
Nostalgia isn't what it used to be.
 
boacvc10
Posts: 469
Joined: Tue Jul 25, 2006 2:31 pm

RE: DC-8 80/ Noe?

Sun Feb 20, 2011 5:31 pm

Quoting 747400sp (Thread starter):
Let's say a there a DC-8 fan with a very large bank account, and he wanted to up date some DC-8 73s by replacing their four CFM 56-2 with four Pratt & Whittney P1000G, and he also changing their cockpit to two man cockpit, could it work? Douglas planes are know for their long life, heck there are still DC-3 flying around, and the last DC-3 was built in the 40's. So could a DC-8 83 work?

Did you make a typo? DC-8 73 in the first two lines, and DC-8 83 in the last line... or did I misunderstand and someone "with a very large bank account" is trying to convert a DC-8 73 into a DC-8 83 (whatever those are).
Up, up and Away!
 
747400sp
Topic Author
Posts: 3900
Joined: Sat Aug 09, 2003 7:27 pm

RE: DC-8 80/ Noe?

Sun Feb 20, 2011 7:13 pm

Quoting boacvc10 (Reply 2):
Did you make a typo? DC-8 73 in the first two lines, and DC-8 83 in the last line... or did I misunderstand and someone "with a very large bank account" is trying to convert a DC-8 73 into a DC-8 83 (whatever those are).

If you put P1000G on a DC-8 73, it is on longer 73 it a 83, just like it was change from a 63 into a 73 when it's JT3s was replaced with CFM 56-2.
 
bohica
Posts: 2353
Joined: Tue Feb 10, 2004 3:21 pm

RE: DC-8 80/ Noe?

Sun Feb 20, 2011 7:25 pm

Quoting 747400sp (Thread starter):
a DC-8 fan with a very large bank account,

That's a good start.  
Quoting 747400sp (Thread starter):
he wanted to up date some DC-8 73s by replacing their four CFM 56-2 with four Pratt & Whittney P1000G, and he also changing their cockpit to two man cockpit, could it work?

I have a better idea. PM me and I will give you the address where your friend can send me a check instead.  

Seriously though, to re-engine a DC-8 and replace the cockpit as well as all the associated changes to electrical, hydraulic, fuel, and other systems would in itself be extremely expensive. Add the cost of certification and it's just not worth it.
 
fr8mech
Posts: 6813
Joined: Mon Sep 26, 2005 9:00 am

RE: DC-8 80/ Noe?

Sun Feb 20, 2011 10:56 pm

Too many cables in the cockpit at the third seat, and the first 2 for that matter. Heck, there is even a button operated cable. All those cable operated valves would have to be modified to straight wire. That's a total rework of pneumatic, hydraulic and fuel systems.

Certification would be through the roof, if it would even be certified.
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