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Navigation Flame Float No. 3 Mk I (Obso¬lescent) and No. 3 Mk II (Service) |
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Filler and Weight | ||
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| NA, | |||
| Body and Overall Weight | |||
| NA, 15.5 in. | |||
| Color | |||
| Yellow over-all | |||
| Type of Round, DODIC | |||
| Navigation Flame Float, NA |
| Description: |
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| The Flame Float No. 3 Mk I has a cylindrical tinplate body, the after end of which has four attached tail fins. The tail end of the body is closed by a tail cover having a central hole. The neck of the tail cap is closed by a thin rupture disk to which is secured a small pillar having a ring passing through it. The forward end of the body is closed by a cast-iron nose having a central water-inlet hole. The nose is contained in a tin-plate COVER, having a central hole covered by a tear-off seal to which is secured either a ring or an eyelet. Inside the body is a perforated zinc central tube surrounded by swans down bag containing calcium magnesium phosphide. Cotton wool is packed around the tail end of the bag, and a layer of glass wool is located between the bag and the iron wire gauze, the charcoal is provided to absorb any slight traces of gas which may be given off while the flame float is in storage. The tail end of the body comprises the buoyancy chamber of the flame float. |
| Use: |
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| The Flame Float No. 3 Mk I has a cylindrical tinplate body, the after end of which has four attached tail fins. The tail end of the body is closed by a tail cover having a central hole. |
| Functioning: |
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| Before dropping, the tear-off seal at the nose is removed. When dropped, the tail rupture disc is broken and the float rises to the surface. Water enters through the water-inlet hole in the nose, passes through the perforated zinc tube, and soaks through the flannel finger into the swans down bag, where it reacts with the calcium magnesium phosphide to give off spontaneously inflammable phosphine. The phosphine, so generated, escapes through the broken rupture disc and takes fire on contact with air. |
| Munition Components: |
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| Data Source: |
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| OP 1665 Explosive Ordnance British |
| Munitions Tech Data Sheet: |
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