Well, I can answer the above now. While searching the forum for another thread I stumbled across the source. The T.O. document was posted by MiTasol in this post.
Your idea is not that bad. The 75 USG tank is 62.5 ImG, which you'd put at 62.5 lbs, not far off from the 60 lbs of one example. Similarly, the 400 ImG Lancaster bomb Bay tank you'd have at 400 lbs, reasonably close to the 428 lbs empty weight. So your system works in some instances. The...
One more:
150 USG capacity drop tank (self-sealing)
1,090 lbs installed weight
190 lbs empty weight including all fittings, attachments, and braces
F4U-1C/-1D aircraft
Keep in mind that statement applies to USN aircraft only as it is the weight of the entire drop tank installation that is calculated from the ACP figures.
Let's use the FG-3 as an example. The weight with 237 gallons of fuel, 13 gallons of oil, 2,400 rounds of ammunition, and no external...
Some more data points:
230 ImG / 276 USG capacity auxiliary bomb bay tank
250 lbs empty weight
Halifax Mks II/V, III, VI, VII aircraft
Computed from Airplane Characteristics & Performance publications:
58 USG capacity drop tank
387 or 388 or 392 or 394 or 398 lbs installed weight
39 or 40 or...
The simple metric I've settled upon for calculating the empty weight of a drop tank without a known empty weight is the ratio resulting from this formula:
empty weight in pounds divided by the tank capacity in U.S. gallons
For example, a 75 USG capacity tank with an empty weight of 60 lbs...
A timely resurrection of this thread as I've been revisiting the data I have, and have some additions.
First, the technical document posted in post #2, while very useful, is missing some pages, as the page numbers at the bottom of the page jump from 68 to 71. In another thread, I forget which...