Torpedo reference (.pdf) - Danger from the deep

Torpe do type re fe re nce
TI G7a "Ato"
Ge räte -Nr.: 12
Diam e te r: 533,4m m
W e igh t: 1538Kg
Le ngth : 7163m m
Ch arge : Ka, or Kc280 w arh e ads , 280Kg (H e xanite ).
Pis tol: Pi1 or TZ 3 w ith Pi3 (contact or contact couple d w ith pas s ive
m agne tic).
Arm ing: 250m (pre 19 43)
150m (pos t 19 43)
Boyancy(% ): 21
Range /Spe e d: 6000m /44Kn (not us e d in e arly w ar)
7500m /40Kn (e arly w ar)
12500m /30Kn (e arly w ar)
6000m /44Kn (late r in th e w ar)
8000m /40Kn (late r in th e w ar)
14000m /30Kn (late r in th e w ar)
Pow e r: De cah ydronaph th ale ne (De calin) W e t-H e ate r, 4 cylinde rs
108h p at 9 40U/m in (e arly w ar)
241h p at 1270U/m in (e arly w ar)
300h p at 1500U/m in (e arly w ar)
255h p at 1280U/m in (late r in th e w ar)
350h p at 1470U/m in (late r in th e w ar)
Note s :
44k nots s e ttings w e re found to ove rload th e e ngine and w e re n't us e d during th e e arly
ye ars of th e w ar. Th e e arly m ode ls us e d in 19 39 h ad range s about 20% le s s th an th e
s tandard s pe cifie d of 6000m /44Kn, 8000m /40Kn, 14000m /30Kn, be ing in fact of
7500m /40Kn and 12500/30Kn. Pow e r als o ch ange d, from 108h p/9 40U/m in,
241h p/1270U/m in, 300h p/1500U/m in, to 255h p/1280U/m in, and 350h p/1470U/m in. Th e
w arh e ad w as a Ka280 or Kc280, w ith 280Kg of H e xanite . Explos ive ch arge w as us ua ly
60% TNT and 40% h e xanitrodiph e lylam ine , in various m ixe s :
SW 18: 50% TNT, 24% H ND, 15% alum inium .
SW 36: 67% TNT, 8% H ND, 25% alum inium .
SW 39 : 45% TNT, 5% H ND, 30% am onium nitrate , 20% alum inium .
SW 39 a: 50% TNT, 10% H ND, 5% am onium nitrate , 35% alum inium .
Note , w ak e w as m uch m ore vis ible at 40Kn, s ince air cons uption ch ange d from 13.6 atü
at 30Kn, to 24.3 atü at 40Kn.