Introduction

The depth charges included in this section are those dropped from aircraft in antisub-marine warfare. Only one size, the 250-pound, is currently in use. They are nromally car-ried on a bomb carrier.

These bombs consist of a cylindrical metal case, with an explosive charge, and have a central tube in which are housed a primer, a detonator, and a tail pistol when the depth charge is ready for use. The depth at which the depth charge will detonate is determin-ed by the pistol, which operates by hydrostatic pressure. A safety device is incorporated to render the depth charge safe in the event of the carrying aircraft's sinking after a for-ced landing. This safety device, however, does not always prevent detonation of the depth charge is dropped safe, as it may be affected by impact with the water.

Aircraft depth charges are thin-walled, with a loading factor of about 65 per cent. They are painted dark green over-all, with a red band, and a colored band to indicate the nature of the explosive filling. Attachments, comprising a nose fairing and/or a tail, are usually fitted to a depth charge to reduce the air resistance when carried externally on an aircraft, and to increase the stability of the air trajectory. Unless fitted with a pa-rachute, failure to detonate may result if the depth charge is dropped from too great a height or at too great a speed.