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Yes. 72,000 for the BI Special only. my focus above is that it was raised to 67-68,000 lbs for specific aircraft late war. Yes, I have Harry Holmes book, but the ultimate source are the primary historical documents, AIR 8/333 and AIR 14/3133, referenced above."Avro Lancaster - The Definitive Record" by Harry Holmes indicates the Lancaster I & III had their gross weight upped to 72,000 as an overload condition in early 1945. Gross weight went from 60,000 to 63,000 in November 1943 and to 65,000 in May 1944.
(I was doing this to ascertain the actual loaded weight of the various SBCs and CPs).
The weight of the Mk 14 cluster matches my understanding. I believe the number of IB's in the SBC's varied a bit. Dad's logbook gives the number of SBC's but not the number of IB's. the ORB gives the number of IB's so I can calculate the number of IB's in each container in those instances.snip....
The weight of a packet of Window can also be calculated.
460 lbs = 23 packets (1 packet would be 20 lbs)
682 lbs = 31 packets (1 packet would be 22 lbs)
The weight of the Mk 14 cluster matches my understanding. I believe the number of IB's in the SBC's varied a bit. Dad's logbook gives the number of SBC's but not the number of IB's. the ORB gives the number of IB's so I can calculate the number of IB's in each container in those instances.
I'm interested in your window calculation. How many "bundles" in a packet? For some operations we know the rate of "windowing."
33K: I don't think package and bundle would be the same thing.
I've attached specs I have for the Mk 14 and Mk 17 Cluster projectile. Dad carried the Mk 17 on a couple of occasions.
View attachment 656061
For anyone wondering about the results of that, these are the weights most commonly derived:
676 lbs = SBC of 150 x 4-lb incendiaries
476 lbs = SBC of 16 x 30-lb incendiaries
376 lbs = SBC of 12 x 30-lb incendiaries
266 lbs = SBC of 8 x 30-lb incendiaries
484 lbs = No. 14 Cluster Projectile (106 x 4-lb incendiaries)