avroarrow
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DC-8 Vs 707 In Cargo Ops

Mon Oct 25, 2004 7:18 am

Approximately how many DC-8 and 707 aircraft are still in use worldwide? I know there are a couple of passenger 707s still kicking, and thats about it. But as far as the cargo side goes it would seem anecdotally at least that the DC-8 is far more common than the 707. Is this correct? and if so what might the reasons behind it be? Larger production run? DC-8 is easier to maintain? Thoughts, opinions, abuse? Put it all in this thread if you want to.  Smile/happy/getting dizzy
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dutchjet
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RE: DC-8 Vs 707 In Cargo Ops

Mon Oct 25, 2004 7:32 am

I dont have any info about 707s and/or DC8s still in pax service, but the DC8 is still in operation for cargo carriers simply because the aircraft made one hell of freigher and for various reasons was a better cargo aircraft than the 707.

Most of the DC8s still around are Super 60 series aircraft, the upgraded and streched version of the DC8 that was introduced in the late 1960s, these aircraft are larger than the original DC8s and 707s and became quite popular with cargo carriers....many DC8 Super 60s were converted from pax configuration; when the first generation widebodies were introduced in the 1970s, many airlines dropped the Super DC8 from their fleets when the aircraft were still quite young (they just went out of style, so to speak) and began their second lives hauling cargo. Also, the DC8 Super 60 re-engine project (CFM56 engines were installed) whereby the aircraft became Super 70 models added years of useful life to the type due to better fuel economy.
 
727200er
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RE: DC-8 Vs 707 In Cargo Ops

Mon Oct 25, 2004 7:41 am

Another reason for more DC8s in cargo service is that, the 707 remained popular as a pax carrier in developing nations. There were also a large number of 707s purchased by the USAF to maintain the KC135 fleet.
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757MDE
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RE: DC-8 Vs 707 In Cargo Ops

Mon Oct 25, 2004 8:08 am

The DC-8, at least the Super 70 with CFM56 engines has less restrictions than the 707. That's the reason why Tampa Cargo changed their 707s for DC-8s in the early 90s.
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boxsmasher
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RE: DC-8 Vs 707 In Cargo Ops

Mon Oct 25, 2004 4:33 pm

Also, the reason you were able to initialy stretch the DC8 is because it sits much higher up, on taller gear, allowing you to stretch the fuselage. Otherwise, like on the 707, if the fuselage were stretched you would bang the tail on every takeoff rotation. This is great foresight on Douglas's part. Stretching a 707 is not possible for that reason alone.
 
JJMNGR
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RE: DC-8 Vs 707 In Cargo Ops

Mon Oct 25, 2004 10:42 pm

Cargo DC-8s in general has less restrictions in terms of maintenance cicles, if comparable with B707. Because of this, to maintain a B707 on the fleet costs more because the airline has to stop aircraft for maintenance before if would stop a DC-8.
 
diesel1
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RE: DC-8 Vs 707 In Cargo Ops

Tue Oct 26, 2004 1:23 am

The capacity in terms of size (cubic capacity) of the DC-8 was far better matched to its performance ability than that of the 707.

In other words, although the 707 had the capability in terms of performance (power) to lift the cargo, but there was no space within the airframe as it would already be stuffed with cargo.

This factor gave the DC-8 better operating economics, and hence led to it's popularity as a freighter in addition to the various reasons already stated.
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lat41
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RE: DC-8 Vs 707 In Cargo Ops

Wed Oct 27, 2004 12:19 pm

As boxsmasher said the DC-8 sits on taller gear. this also made it easier to install the more modern, larger diameter CFM engines as part of the conversion to "Super 70" designation
 
N1120A
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RE: DC-8 Vs 707 In Cargo Ops

Wed Oct 27, 2004 1:06 pm

One reason that is invalid is production run. Boeing made nearly twice as many 707s than Douglas made DC-8s, however, the DC-8s have lasted longer. Also, there is a CFM56 conversion for the 707 (many KC-135s have had it done). The DC-8 does have better takeoff performance and in its stretch form is a much, much larger aircraft. Makes one wonder, given its performance and range, why not have a cargo version of the 753 (the only narrowbody bigger than the DC-8) to keep the line alive and replace DC-8s

[Edited 2004-10-27 06:09:22]
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727200er
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RE: DC-8 Vs 707 In Cargo Ops

Wed Oct 27, 2004 3:54 pm

why not have a cargo version of the 753 (the only narrowbody bigger than the DC-8) to keep the line alive and replace DC-8s

DC-8 70s have more lifting capacity from my calculations.
"they who dream by day are cognizant of many things which escape those who dream only at night" - Edgar Allen Poe