"New" Series Practice Bombs

Mk 15 Mod 3 uses Spotting Signal Mk 7; the others use Mk 6 Mod 0.

This series bomb is a welded sheet-steel light-case design having identical dimenisons to AN standard G.P. bombs, and uses AN standard G.P. bomb tails. The bomb has, wel-ded to its body, two suspension lugs spaced 14.0 inches apart. Seven threaded reces-ses, located on the periphery at the approximate center of gravity, are for various hois-ting conditions. At 90 degrees, on each side of the suspension lugs and slightly before the hoisting recesses, are threaded openings to receive trunnions.

By means of a strap, the appropriate practice bomb signal, Mk 6 or Mk 7, may be at-tached to the tail assembly with the forward end of the signal seated in a recess in the after end of the bomb body.

A flat-nose attachment has been designed for use with the Practic Bomb Mk 15 Mod 3 for anti-submarine bombing practice. The flat nose is installed by removing the nose-fill-ing cap, slipping the attachment over the nose of the bomb, and then screwing the filling cap down tightly by hand to hold the attachment inplace. The flat nose will prevent ri-cochet at entrance angles as low as 9°.

The 2,000-pound-size container was designed for an incendiary or practice filler but, thus far, it is approved by the Bureau of Ordnance for practice filling, sand, only. As de-signed for incendiary loads, it would take a nose fuze, the Burster Mk 1, and the Igniter Mk 40; however this is subjectet to change before Bureau approval of the bomb as an incendiary. The Mk 67 has standard suspension lugs and provision for trunnions.

Length

Diameter

Water-Loaded

Sand-Loaded

100-lb.

Mk 15 Mod 3

41.2"

8.0"

64.25#

100#

500-lb.

Mk 65 Mod 0

56.6"

14.0"

220.0#

388#

1,000-lb.

Mk 66 Mod 0

67.0"

18.6"

474.0#

834#

2,000-lb.

Mk 67 Mod 0

90.15"

23"

...

733#