Aircraft Cruise L/D Ratios

[Jane-DoH]

I'm wondering if anybody has the cruise-mach L/D ratio figures for the following aircraft

DeHavilland Comet 1

Boeing 707-120

Boeing 707-320C

Douglas DC-8-30

Douglas DC-8-62

Douglas DC-9

McDonnell Douglas DC-10-30

McDonnell Douglas MD-11

Boeing 777-200LR

Airbus A-380

[decurion]

Table 1 and 2 of the following report should help you:

The initial calculation of range and mission fuel during conceptual design :: TU Delft Institutional Repository

[Jane-DoH]

I don't know if I could really make use of this data

[decurion]

it is all in report. Fig. 1 gives the engine efficieny as function of engine bypass ratio. For aircraft not listed you can do your own using payload range diagrams.

[Jane-DoH]

Uh, I'm not a pilot and don't really know payload range diagrams. I'm just wondering how a Comet compared to a 707, and how an L-1011 compared to them, and so forth