COMPARATIVE VALUE OF TARGETS
|
REQUIREMENTS FOR AIR ASCENDANCY Tab B European Theatre - Appendix G-VIII Alumina Plants |
LIST OF TARGETS
|
No. |
Place |
Name of Plant |
Alumina Capacity Metric Tons p.a. |
Percentage of Total |
|
1. |
Bergheim (Cologne) |
Martinswerk |
140,000 |
14.5 |
|
2. |
Lunen (Ruhr) |
Lippewerk |
140,000 |
14.5 |
|
3. |
Lausitz (Saxony) |
Lautawerk |
108,000 |
11.2 |
|
4. |
Mundenheim (Rhine) |
Gebr.Guilini |
80,000 |
8.3 |
|
5. |
Porta Marghera (Venice) |
S.A.V.A. (Neuhausen) |
75,000 |
7.8 |
|
6. |
Schwandorf (Bavaria) |
Nabwerk |
65,000 |
6.8 |
|
7. |
Gardanne (Marseilles) |
Pechiney |
60,000 |
6.2 |
|
8. |
Porta Marghera (Venice) |
Montecatini |
60,000 |
6.2 |
|
9. |
St. Auban (Basses-Alpes) |
Pechiney |
50,000 |
5.2 |
|
10. |
Salindres (Gord) |
Pechiney |
30,000 |
3.1 |
|
11. |
St. Louis Les Aygalades (Marseilles) |
A.I.A.G. |
30,000 |
3.1 |
|
12. |
La Barasse (Marseilles) |
Ugine |
20,000 |
2.1 |
|
13. |
Aurelia (Rome Area) |
S.A.P.C.N. |
20,000 |
2.1 |
|
14. |
Hoyanger (Sogne Fjord) |
Norsk Aluminium |
20,000 |
2.1 |
|
Other plants in Germany, Italy, Yugoslavia, Hungary and Sweden |
66,000 |
6.8 |
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|
TOTAL |
964,000 |
100.0 |
||
|
NOTES: 1. The total number of alumina plants in Germany and German occupied countries is twenty-one (21) with a total capacity of 964,000 tons per annum, which is equivalent to 482,000 tons of aluminum. However, the fourteen (14) plants listed above account for 93.2 of the total, namely 898,000 tons of alumina or 449,000 tons of aluminum. 2. The estimated minium war needs of Germany, allowing for the substitution of zinc, copper, magnesium, and stainless steel, for 1942, are 325,000 metric tons of aluminum. However, allowing also for the substitution in aircraft design of plywood, etc. under drastically restricted aluminum availability, it is possible that the minimum requirement could be reduced to approximately 200,000 tons per year for which about 400,000 tons of alumina is required. 3. The destruction of the first eight (8) plants given in the schedule above represents an output of 75.5%, leaving a balance of 24.5% which is well below the minimum requirements. This, of course, ignores any temporary relief which might be obtained for a short period by drastic requisitioning of any available aluminum in the country. |
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1. DESCRIPTION OF TARGETS
The layout of alumin plants can very considerably, but essentially the components comprise grinding plant, gas producing plant and gas holders, calcining furnace, precipitation plant, etc. In view of the variations that can occur in the layout it is not possible to give any average figures for areas of plants,
2. NUMBER OF DIRECT HITS AND TYPE OF BOMBS REQUIRED
In view of the fact that some of the plant involved is of heavy construction and others are light, it is considered that these targets can best be attacked by the use of a mixture of 500 lb. and 300 lb. bombs, and, for purposes of calculation, it has been assumed that the weight of attack should be such that not less than 20 - 500 lb. bombs and 60 - 300 lb. bombs should fall within an aiming point area of 1,000’ x 1,000’.
3. NUMBER OF SORTIES AND BOMBER FORCE REQUIRED
Based upon detailed calculations taking into account all operational factors involved in making attacks against highly defended targets with appropriate allowances for probabilities, aiming errors, losses, etc., etc,, and allowing for the fact that with the weight of attack proposed the destruction will be such that the plant will take from 6 to 8 months to replace, and hence no further attacks will be required within a six month period, it appears that it will be necessary to have:—
1,932 SORTIES
In order to carry out these sorties in 35 operational days a force of:-
65 BOMBERS
must be set up.