Torpedo reference (.pdf) - Danger from the deep

) TV s ucce s s e s h ave re m aine d at th e le ve l of 60% h its . Th e torpe do
h as continue d to fi l th e prom is e it s h ow e d afte r its firs t us e in
Se pte m be r. De tails of re s ults are :
By th e e nd of June 19 44 341 ope rational s h ots h ad be e n re porte d to
B.d.U. of th e s e :
175 h its and 20 probable h its = 58%
67 e xplaine d m is s e s
44 une xplaine d m is s e s
4 e m e rge ncy s h ots
2 une xplaine d s h ots
33 failure s .
Th e failure s re s olve d th e m s e lve s into:
17 tube runne rs
7 pre m ature s
3 duds
1 tube -s tick e r
1 s urface bre ak e r
1 torpe do failure
3 une xplaine d failure s .
Sunk w ith TV:
1 cruis e r
128 de s troye rs and e s cort ve s s e ls and 23 probable s
3 s ubm arine s
18 fre igh te rs
2 tank e rs .
c) A large num be r of re ports re ce ive d s ince about March /April s h ow
th at th e e ne m y is m ak ing gre at e fforts to produce counte rm e as ure s
to TV. Th e re ports s pe ak of w ide ly-varying type s of nois e s obs e rve d
in e ne m y de s troye rs , e s cort ve s s e ls , and anti-s ubm arine ve s s e ls .
Th e nois e s w e re de s cribe d as be ing lik e a circular s aw , a continuous
gnaw ing, th e rattle of a DKW e ngine . Th e s e are probably cas e s of
th e anti-TV tow e d nois e -box. In th e cas e of oth e r nois e s , s uch as a
s inging-s aw and h um m ing, it is not k now n w h e th e r th e y de rive from
a ne w location ge ar or from a TV counte rm e as ure . In 4 cas e s th e
TV h it, e ve n w h e n nois e s h ad be e n h e ard, in 3 cas e s it is s us pe cte d
th at th e torpe do w as dive rte d by a nois e -box, in one furth e r cas e th e
torpe do is be lie ve d to h ave be e n de s troye d by de pth -ch arge s w ith
s h a low s e tting droppe d into th e w ak e .
Furth e r de ve lopm e nt is th e re fore conce ntrating on fitting w h ich w i l