In the Badin raid the 4000 lbs bombs dropped by first aircraft turned to be duds based on Wilson's writeup.I am interested in the causes of such high dud rate for the 4000 lbs bombs used in 1965 war.
IAF had two types of bombs: 1000 lbs MC
and 4000 lbs MC
. Both had ~50% filling of RDX/TNT.
Normally it's the fuzes that are suspect as many things can go wrong with mechanical devices.
However we note both bombs had the same set of fuzes for nose and tail fuze:NP27/42
or NP 44
and TP 28/30
First three type are contact or instantaneous. The last is time delay based on chemical action. Only for very long delay. So not used.
And we know the 1000 lbs ones usually worked.
So less probability of faulty fuzes.
Then attention goes to the explosive filling. RDX/TNT is stable with long life.
OFB certifies them up-to 30 years age.
Also storage temperature has bad effect of reducing the effective life of chemicals.
So most likely these 4K bombs were WWII stock sold off by UK.
Then add storage temperature.
Both effects could have led to the high dud rate.
I wish they had tried them in flight demos or Pokhran firepower demos to see if the worked.
Also could they have used both nose and tail fuzes to ensure redundancy?