Imperial Japanese Navy Explosives
Type 99 No.80 Mk 5 Bomb
Fuzes: Two B-2(b) tail fuzes
Overall Length: 95 and 1/2 inches
Length of body: 52 and 1/8 inches
Diameter of body: 16 and 1/8 inches
Thickness of wall:
-Nose: 4 inches
-Tail: 2 inches
-Nose: 4 inches
-Tail: 2 inches
Material of wall: Forged Steel
Type of suspension: Horizontal
Suspension lug: Two guide studs on the bomb bode, position a carrying band, to which a suspension lug is attached.
Length of tail: 43 and 3/8 inches
Width of tail: 22 and 1/8 inches
Width of tail fins: 11 and 1/16 inches
Dimensions of tail struts:
-Length: 15 and 1/4 inches
-Width: 2 and 3/4 inches
-Thickness: 3/16 inch
Material of tail: Sheet Steel
Type of filling: Type 91 explosive (trinitroanisol)
Weight of filling: 66 pounds (approximate)
Total weight of bomb: 1,641 pounds (w/o tail)
Charge/weight ratio: 4%
Color and markings: Gray overall. Green band around the nose, white band aft of green band
Construction of body: The bomb body is constructed of one piece of forged machined steel. There are eight recesses cut in the nose presumably to hold a windshield if the case is used as a projectile. A male base plate which has two fuze pockets is screwed into the after end of the body.
The tail cone is formed of rolled sheet steel (3/32-inch) welded down one side. Twelve screws fasten the unreinforced base of the cone to the base plate of the bomb which has holes drilled around the edge to receive the screws. Three hinged doors in the cone permit access to the fuze pockets.
Two vane assembly supporting rings are located at the apex of the cone. These rings are constructed to receive the B-2(b) vane assembly bushings which are held in place by set screws. Slots in the tail cone are located beneath the supporting rings to permit passage of the reach rods from the fuze bodies to the vane assembly.
The tail cone is formed of rolled sheet steel (3/32-inch) welded down one side. Twelve screws fasten the unreinforced base of the cone to the base plate of the bomb which has holes drilled around the edge to receive the screws. Three hinged doors in the cone permit access to the fuze pockets.
Two vane assembly supporting rings are located at the apex of the cone. These rings are constructed to receive the B-2(b) vane assembly bushings which are held in place by set screws. Slots in the tail cone are located beneath the supporting rings to permit passage of the reach rods from the fuze bodies to the vane assembly.
Construction of tail: Four sheet-steel fins are spot welded to the tail cone and are braced by a single set of box-type tail struts.
Type 2 No.80 Mk 5 and No.150 Mk 5 Bombs
Please read the general description of this entry
No picture available
Type 2 No.80 Mk 5
Please read the general description of this entry
Type 2 No.80 Mk 5
Fuzes: Two B-2(b) tail fuzes
Gaines: Special Mk 5
Approximate weight of bomb: 1,760 pounds
Material of wall: Forget steel
Material of tail: Sheet Steel
Type of filling: Type 91 explosive
Approximate loading factor: 6%
No.150 Mk 5
Fuzes: Two large fuzes similar to the B-2(b) fuze
Gaines: Special Mk 5
Approximate weight of bomb: 3,300 pounds
Material of wall: Forget steel
Material of tail: Sheet Steel
Type of filling: Type 91 explosive
Approximate loading factor: 6%
Gaines: Special Mk 5
Approximate weight of bomb: 1,760 pounds
Material of wall: Forget steel
Material of tail: Sheet Steel
Type of filling: Type 91 explosive
Approximate loading factor: 6%
No.150 Mk 5
Fuzes: Two large fuzes similar to the B-2(b) fuze
Gaines: Special Mk 5
Approximate weight of bomb: 3,300 pounds
Material of wall: Forget steel
Material of tail: Sheet Steel
Type of filling: Type 91 explosive
Approximate loading factor: 6%
Color and markings: Gray overall with a green and brown nose band and white tail struts
General Description: These two bombs were designed to fill the great need of the Japanese for armor-piercing bombs. Prior to the design of these two, the Japanese Navy had only one true armor-piercing bomb, the Type 99 No. 80 Mk 5, an adaptation of a large caliber artillery shell produced by turning the shell down to a streamlined shape and adding a tail section and a slightly larger explosive charge.
Type 2 No.80 Mk 5 and No.150 Mk 5, although they were specifically designed as armor-piercing bombs, differ only slightly from the earlier bomb. Type 2 No.80 Mk 5 differs from the Type 99 No.80 Mk 5 only in having a slightly larger explosive charge, and in having no recesses at the nose to hold a windshield in place. No.150 Mk 5 is simply a larger version of the Type 2 No.80 Mk 5.
Both bombs of the No.80 size use two B-2(b) fuzes in the tail with the special Mk 5 gaine. No.150 Mk5 has two large fuzes of similar construction to the B-2(b). These bombs were never extensively produced and neither Type 2 No.80 Mk 5 or No.150 Mk 5 was ever found outside the Japanese homeland.
The data on these bombs is the result of incomplete investigation, and must not be considered as specific, accurate information.
Note: I'm not sure what the next few paragraphs were intended for, but they are included for accuracy towards the source material.
The Mk 7 bomb was never more than an idea as far as the Japanese Navy was concerned. It was suggested and discussed by a meeting of designers in 1935, but no experiments were carried out because the idea was considered impractical and unnecessary. The bomb, as planned, was to consist of the 1 kilogram practice bomb, with a conical glass bottle of bacillus culture in place of the smoke mixture in the tail.
Type 2 No.80 Mk 5 and No.150 Mk 5, although they were specifically designed as armor-piercing bombs, differ only slightly from the earlier bomb. Type 2 No.80 Mk 5 differs from the Type 99 No.80 Mk 5 only in having a slightly larger explosive charge, and in having no recesses at the nose to hold a windshield in place. No.150 Mk 5 is simply a larger version of the Type 2 No.80 Mk 5.
Both bombs of the No.80 size use two B-2(b) fuzes in the tail with the special Mk 5 gaine. No.150 Mk5 has two large fuzes of similar construction to the B-2(b). These bombs were never extensively produced and neither Type 2 No.80 Mk 5 or No.150 Mk 5 was ever found outside the Japanese homeland.
The data on these bombs is the result of incomplete investigation, and must not be considered as specific, accurate information.
Note: I'm not sure what the next few paragraphs were intended for, but they are included for accuracy towards the source material.
The Mk 7 bomb was never more than an idea as far as the Japanese Navy was concerned. It was suggested and discussed by a meeting of designers in 1935, but no experiments were carried out because the idea was considered impractical and unnecessary. The bomb, as planned, was to consist of the 1 kilogram practice bomb, with a conical glass bottle of bacillus culture in place of the smoke mixture in the tail.
A lengthened striker was to break the bottle, and the culture was to spread by the force of impact. A spread of 1 meter in diameter was hoped for. No specific type of bacillus had been selected for the bomb. Distinctive color marking for the bomb was to have been purple painted nose and tail.
Type 5 No.1 Mk 9 Model 1 and Type 3 No.6 Mk 9 Bombs
No picture available
Type 5 No.1 Mk 9 Model 1
Overall length: 35.4 inches
No picture available
Type 5 No.1 Mk 9 Model 1
Overall length: 35.4 inches
Diameter of body: 3.93 inches
Weight of explosive: 2.2 pounds
Weight of propellant: 4.4 pounds
Total weight of bomb: 33 pounds
Maximum speed: 230m/sec
Type 3 No.6 Mk 9
Overall length: 66.9 inches
Type 3 No.6 Mk 9
Overall length: 66.9 inches
Diameter of body: 7.87 inches
Weight of explosive: 22 pounds
Weight of propellant: 22 pounds
Total weight of bomb: 184.8 pounds
Maximum speed: 230m/sec
Color and markings: Gray overall. Green band on nose, with brown band just aft of green band. Gray tail struts.
General description: Neither of these rockets had been put into production at the end of the war, although experiments had been finished on both of them. Both were designed as aircraft launched weapons for use against surface targets; Type 5 No.1 Mk 9 Model 1 against surface submarines, and the Type 3 No.6 Mk 9 against landing craft and small ships.
These rockets are similar to the Mk 27 and Mk 28 rockets of comparable sizes, but both are somewhat heavier. Both carry high-explosive loads, and the Type 5 No.1 Mk 9 Model 1 has a semi-armor piercing nose.
Exact fuzing is unknown, but it is known that the Type 5 No.1 Mk 9 Model 1 uses a fuze with a 0-2 second delay. The Type 3 No.6 Mk 9 is assumed to use an instantaneous fuze. Both of these rockets are fin stabilized, and more closely resemble American aircraft launched rockets than any of the other Japanese rockets. However, their small propellant charges result in such low speed that their performance in no way compares with that of American rockets.
These rockets are similar to the Mk 27 and Mk 28 rockets of comparable sizes, but both are somewhat heavier. Both carry high-explosive loads, and the Type 5 No.1 Mk 9 Model 1 has a semi-armor piercing nose.
Exact fuzing is unknown, but it is known that the Type 5 No.1 Mk 9 Model 1 uses a fuze with a 0-2 second delay. The Type 3 No.6 Mk 9 is assumed to use an instantaneous fuze. Both of these rockets are fin stabilized, and more closely resemble American aircraft launched rockets than any of the other Japanese rockets. However, their small propellant charges result in such low speed that their performance in no way compares with that of American rockets.
Type 98 No.7 Mk 6 Bomb Model 1
Fuzes: (w/ Magazine) A-3(a), or A-3(b)
Overall Length: 40 inches
Length of body: 21 and 3/4 inches
Diameter of body: 7 and 7/8 inches
Thickness of wall: 1/4 inch
Material of wall: Steel
Type of suspension: Horizontal
Suspension lug: Normal Navy suspension lug
Length of tail: 18 and 3/16 inches
Width of tail: 10 and 5/8 inches
Dimensions of tail struts:
-Length: 7 and 7/8 inches
-Width: 1 and 3/8 inches
-Width: 1 and 3/8 inches
-Thickness: 3/32 inch
Material of tail: Sheet Steel
Type of filling: Four thermite-filled electron fire pots are contained within the bomb. The nose and tail fire pots are cylindrical, while the two in the body are semicircular. A central channel filled with quick-match runs the length of the bomb. A black-powder charge is located int he circular recess in the nose piece.
Weight of filling: 81 pounds
Total weight of bomb: 156 pounds
Charge/weight ratio: 51%
Color and markings: Gray overall with a red nose band and red tail struts. New type color markings will be found.
Construction of body:
A cast-steel nose piece is riveted with 2 rows of 10 rivets each to a tubular steel body. The tail cone is held by 1 row of 24 rivets to a collar which is held in the base of the bomb by 2 rows of screws (14 per row).
Construction of tail:
Four steel fins are welded to the tail cone and are braced by a single set of box-type struts.
Operation: On impact, the magazine in the nose fuze fires the black powder and the igniting charge. The black powder ejects the fire pots from the bomb case. The igniting charge ignites the quick-match which initiates combustion of the thermite.
Operation: On impact, the magazine in the nose fuze fires the black powder and the igniting charge. The black powder ejects the fire pots from the bomb case. The igniting charge ignites the quick-match which initiates combustion of the thermite.
Type 98 No.7 Mk 6 Bomb Model 2
Fuzes: (w/ Magazine) A-3(a), or A-3(b)
Overall Length: 42 inches
Length of body: 21 inches
Diameter of body: 9 and 3/8 inches
Thickness of wall: 3/16 inch
Material of wall: Steel
Type of suspension: Horizontal
Suspension lug: Normal Navy suspension lug
Length of tail: 21 inches
Width of tail: 13 and 1/4 inches
Width of tail fins: 6 inches
Width of tail fins: 6 inches
Dimensions of tail struts:
-Length: 9 and 1/2 inches
-Width: 1 and 3/8 inches
-Width: 1 and 3/8 inches
-Thickness: 1/16 inch
Material of tail: Sheet Steel
Type
of filling: A central thermite core surrounded by solidified kerosene, petrol, and alcohol-soap mixture.
Charge/weight ratio: 22%
Weight of filling:
-20 pounds of inflammable mixture
-7.5 pounds of thermite
Total weight of bomb: 145 pounds-20 pounds of inflammable mixture
-7.5 pounds of thermite
Charge/weight ratio: 22%
Color and markings: Gray overall with two longitudinal diametrically opposite thin red lines. Red nose and red struts. New type markings will be found.
Construction of body: cast-steel nose is attached to a tubular-steel body by a continuous circumferential weld and 2 rows of 16 plug welds each. A wood block and black powder burster charge are located in the nose. Housed within the body is a steel cylinder which contains the incendiary filling.
A central copper tube within the cylinder contains quick-match. A tail cone is attached to a collar by a continuous circumferential weld and 16 plug welds. The collar fits into the after end of the body and is held there by 2 rows of 16 screws each.
A central copper tube within the cylinder contains quick-match. A tail cone is attached to a collar by a continuous circumferential weld and 16 plug welds. The collar fits into the after end of the body and is held there by 2 rows of 16 screws each.
Construction of tail: Four steel fins are welded to metal strips which are riveted (14 rivets each) to the tail cone. The fins are braced by a single-set of box-type struts.
Operation: On impact, the magazine in the nose fuze fires the black-powder charge which shears off the tail cone and ejects the incendiary cylinder out of the bomb case. At the same time, the quick match is ignited. This in turn sets fire to the thermite and the inflammable mixture.
Operation: On impact, the magazine in the nose fuze fires the black-powder charge which shears off the tail cone and ejects the incendiary cylinder out of the bomb case. At the same time, the quick match is ignited. This in turn sets fire to the thermite and the inflammable mixture.
Type 1 No.7 Mk 6 Bomb Model 3 Modification 1
Fuzes: A-3(a)
Dimensions of tail struts:
-Length: 9 and 1/2 inches
Overall Length: 42 and 1/4 inches
Length of body: 21 inches
Diameter of body: 9 and 3/8 inches
Thickness of wall: 1/8 inch
Material of wall: Steel
Type of suspension: Horizontal
Suspension lug: Normal Navy suspension lug
Length of tail: 21 inches
Width of tail: 13 and 1/4 inches
Width of tail fins: 6 inches
Dimensions of tail struts:
-Length: 9 and 1/2 inches
-Width: 1 and 3/8 inches
-Thickness: 1/16 inch
-Thickness: 1/16 inch
Material of tail: Sheet Steel
Type of filling: 182 cylindrical incendiary pellets are arranged around a central cardboard tube. The pellets are bound together with string to form rings. The rings surround the central tube which is filled with gray powder. All the space in the bomb not occupied by the pellets is filled with this powder.
Weight of individual pellets: 7 ounces
Total weight of pellets: 81 pounds
Length of pellets: 2 and 1/8 inches
Diameter of pellets: 1 and 1/2 inches
Composition of pellets:
-Barium nitrate: 35%
-Ferric oxide: 28%
-Aluminum: 18%
The remainder is synthetic rubber of polysulphite type resembling "Thiokol."
Weight of igniter powder: 30 pounds
Composition of igniter powder:
-Barium nitrate: 75%
-Aluminum: 24.5%
-Oil: 0.3%
-Moisture: 0.2%
Weight of filling: 111 pounds
Weight of individual pellets: 7 ounces
Total weight of pellets: 81 pounds
Length of pellets: 2 and 1/8 inches
Diameter of pellets: 1 and 1/2 inches
Composition of pellets:
-Barium nitrate: 35%
-Ferric oxide: 28%
-Aluminum: 18%
The remainder is synthetic rubber of polysulphite type resembling "Thiokol."
Weight of igniter powder: 30 pounds
Composition of igniter powder:
-Barium nitrate: 75%
-Aluminum: 24.5%
-Oil: 0.3%
-Moisture: 0.2%
Weight of filling: 111 pounds
Total weight of bomb: 160 pounds
Charge/weight ratio: 69.4%
Color and markings: Gray overall with a 3 and 1/2-inch red band at the nose and red tail struts. New type markings will be found.
Construction of body: A cast-steel nosepiece is attached to a longitudinally welded steel body by a continuous circumferential weld. The nose contains a wooden block 1 and 3/4 inches thick to which a light metal gaine well is secured by three nails.
A longitudinally welded tail cone is welded to a collar which fits into the after end of the body and is held there by a single row of 16 screws.
A longitudinally welded tail cone is welded to a collar which fits into the after end of the body and is held there by a single row of 16 screws.
Construction of tail: our steel fins are spot welded to the tail cone. They are braced by a single set of box-type struts.
Remarks:
-Type 1 No.7 Mk 6 Model 3: This bomb uses the same case as that described above but differs in the filling. It contains a high-explosive burster charge in a central tube and an explosive filling of approximately 520 wedge-shaped rubber pellets impregnated with iron and aluminum.
Remarks:
-Type 1 No.7 Mk 6 Model 3: This bomb uses the same case as that described above but differs in the filling. It contains a high-explosive burster charge in a central tube and an explosive filling of approximately 520 wedge-shaped rubber pellets impregnated with iron and aluminum.
Type 3 No.25 Mk 8 Bomb Model 1
Fuzes: A-3(a)
Overall Length: 67 inches
Length of body: 39 and 5/8 inches
Diameter of body: 12 inches
Thickness of wall: 1/2 inch
Material of wall: Steel
Type of suspension: Horizontal
Suspension lug: Normal Navy suspension lug
Length of tail: 27 and 3/8 inches
Width of tail: 19 and 5/8 inches
Width of tail fins: 6 and 3/8 inches
Dimensions of tail struts: None
Material of tail: Sheet Steel
Type of filling: Type 97 explosive
Weight of filling: 263 pounds
Total weight of bomb: 649 pounds
Charge/weight ratio: 40%
Color and markings: Green band around the nose, brown band aft of green band. Gray body and tail.
Construction of body: A cast-steel nose is attached to a tubular-steel body by a continuous circumferential weld and 12 plug welds. A tail cone is held to a collar by 8 plug welds. The collars fits into the after end of the body and is held there by 40 screws.
Construction of tail: The normal tail cone has been cut off 8 and 3/4 inches aft of the junction with the bomb body proper and to this has been welded a 3/16 inch steel cylinder and four 1/8 inch steel hollow tail fins.
Tail cylinder:
-Outside diameter: 5 and 5/8 inches
-Length: 18 and 5/8 inches
-Type of filling: Type 97 explosive
Tail fins:
-Shape of cross-section: Triangular
-Overall length: 25 and 1/2 inches
-Height: 6 and 3/8 inches
-Width at base: 2 and 1/2 inches
Construction of tail: The normal tail cone has been cut off 8 and 3/4 inches aft of the junction with the bomb body proper and to this has been welded a 3/16 inch steel cylinder and four 1/8 inch steel hollow tail fins.
Tail cylinder:
-Outside diameter: 5 and 5/8 inches
-Length: 18 and 5/8 inches
-Type of filling: Type 97 explosive
Tail fins:
-Shape of cross-section: Triangular
-Overall length: 25 and 1/2 inches
-Height: 6 and 3/8 inches
-Width at base: 2 and 1/2 inches
Reinforcement of fins:
1. A box strut made of 1/8-inch mild steel runs the length of the fin on the inside. The box strut is 7/8-inch wide at the top and 1 and 3/4 inches high and 22 inches long. The strut is welded along the two lower edges to the side of the fins proper and spot welded along the sides.
2. Three 1/4-inch mild steel braces, 1 and 1/2 inches wide at the top, 2 and 1/2 inches wide at the bottom and 2 inches high are welded at 5 and 1/2-inch intervals to the box strut and the sides of the fins. The lower sides of these braces have been shaped to fit the cylinder.
3. The end of the fins is closed by a 1/8-inch steel plate welded in place.
Next Time: More IJN bombs, including cluster munitions
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