747400sp
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How Can A DC-8 60/70 Series Out Lift An A300?

Mon Mar 08, 2010 12:03 am

I was looking at DHL (ASTAR) web site not to long ago, and when I looked up the drifferent a/c payload, it showed that their DC-8 71 or 73 carry around 105000 lb and their A300 carried around 96000 lb. Seeing that an A300 is a widebody, and that WB can carry pallets on the on the main deck and in the baggage area, I would think an A300 should be able to carry more payload. Yes, I know a DC-8 71 or 73 is a longer a/c, but it just by around 10 ft longer, and it narrow.
 
tdscanuck
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Mon Mar 08, 2010 12:31 am

Quoting 747400sp (Thread starter):
I was looking at DHL (ASTAR) web site not to long ago, and when I looked up the drifferent a/c payload, it showed that their DC-8 71 or 73 carry around 105000 lb and their A300 carried around 96000 lb. Seeing that an A300 is a widebody, and that WB can carry pallets on the on the main deck and in the baggage area, I would think an A300 should be able to carry more payload. Yes, I know a DC-8 71 or 73 is a longer a/c, but it just by around 10 ft longer, and it narrow.

The amount of payload they can carry isn't usually a function of space, it's a function of weight. The bigger DC-8's and the A300 have almost the same OEW and MTOW. Unless you're carrying low density cargo, you'll typically max out the weight long before you max out the volume.

Tom.
 
prebennorholm
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Mon Mar 08, 2010 1:23 am

Please have a look at how much more powerful the DC-8-7x is when one engine fails at V1 speed. Then you will see that the A300 actually compares extremely favorably.

The A300 fuselage volume was made for efficient transport of large pax numbers over pretty short sectors. While the DC-8 was made as a long haul plane.

Also have a look at the DC-8-7x range capability with max cargo load. It isn't impressive since with that load there is no way it can also fill its fuel tanks. If you want to utilize a fair part of its splended range capability (which some operators do), then you will have to reduce the payload to a much smaller weight than max cargo weight.
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B777LRF
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Mon Mar 08, 2010 9:55 pm

Basically, the Diesel Eight is a stronger aeroplane. Douglas build their aeroplanes to last, and by todays measures would be considered severely over-engineered.

Sure, the 'Bus got more volume, but the -Eight can carry more weight, not only total payload but also on an individual ULD basis.

To give you an example, maximum ULD weight on the A300B4 is 6804 kg. Max on the 8-73 is 7874 kg.
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Clydenairways
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Tue Mar 09, 2010 11:26 am

Quoting B777LRF (Reply 3):
Basically, the Diesel Eight is a stronger aeroplane. Douglas build their aeroplanes to last, and by todays measures would be considered severely over-engineered.

This has nothing to do with it (Even thought Douglas aircraft are built like a tank).

To try and put this simply,
The DC8 is a long range aircraft, therefore it has to be able to lift a lot of weight to carry a load Long Range.
The A300 is a medium range aircraft, so it's take off weight is based on the weight of it's typical payload + fuel to travel medium ranges.
 
B777LRF
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Tue Mar 09, 2010 4:45 pm

Quoting clydenairways (Reply 4):
This has nothing to do with it (Even thought Douglas aircraft are built like a tank).

It has everything to do with it, and nothing to do with the MTOW you're referring to. What allows the DC-8 to carry so much weight is the strenght of its construction, particularly the floor. Thought I illustrated that perfectly by showing the difference in maximum ULD weight.
From receips and radials over straight pipes to big fans - been there, done that, got the hearing defects to prove
 
tdscanuck
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Tue Mar 09, 2010 6:49 pm

Quoting clydenairways (Reply 4):
This has nothing to do with it (Even thought Douglas aircraft are built like a tank).

To try and put this simply,
The DC8 is a long range aircraft, therefore it has to be able to lift a lot of weight to carry a load Long Range.
The A300 is a medium range aircraft, so it's take off weight is based on the weight of it's typical payload + fuel to travel medium ranges.

You're talking about the same thing...in order to be able to lift a lot of weight (in order to support the long range, and because Douglas designed to a higher requirement), the airplane is built stronger.

Tom.
 
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Stitch
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Tue Mar 09, 2010 11:53 pm

The DC-8-63 / DC-8-73 are within general spitting distance on volume of the A300-600F: 363 m3 compared to 374m3.
 
soon7x7
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Wed Mar 10, 2010 3:15 am

Doesn't the DC-8 have more wing area?...that is the lifting source here...DC-8 wing area = 2927 sq/ft....A300 wing area = 2798 sq/ft...j
 
tdscanuck
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Wed Mar 10, 2010 5:00 am

Quoting soon7x7 (Reply 8):
Doesn't the DC-8 have more wing area?...that is the lifting source here...DC-8 wing area = 2927 sq/ft....A300 wing area = 2798 sq/ft...j

Wing area, by itself, doesn't tell you anything about payload capacity. If the A300 ran the same wing loading as a 777-300, the wing would lift a lot more, but the structure wouldn't take it.

Tom.
 
Flighty
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RE: How Can A DC-8 60/70 Series Out Lift An A300?

Fri Mar 12, 2010 7:39 pm

Long story short, the DC8 with new engines is an absolute narrowbody-on-steroids. It's more like an A340 than like a 737.

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