TM 5-5420-278-10
0019 00
0019 00-7
SITE REQUIREMENTS AND LAYOUTS (Contd)
a. For a free launch of IRB bays, the following requirements must be met:
(1) The maximum river bank slope is 20%.
(2) The maximum bank height is 60 in. (152 cm).
(3) Water velocity should not be greater than 8 ft (2.44 m) per second.
(4) The minimum water depth must be a least 6 ft (1.8 m) to free launch
the interior bay from the maximum river bank slope of 20% (This is
based on a zero bank height with the CBT backed into the water up to
the top of its rear axle hubs).
(5) The minimum water depth must be at least 9 ft (2.7 m) to free launch
the ramp bay from the maximum river bank slope of 20% (This is based
on a zero bank height with the CBT backed into the water up to the top
of its rear axle tire rims).
(6) The minimum water depth must be at least 7 ft 4 in. (2.2 m) to free
launch the interior bay and 12 ft (3.7 m) to free launch the ramp bay
from the maximum bank height of 60 in. (152 cm) and river bank slope
of 20%.
b. For a controlled launch of IRB bays, the following requirements must be met.
(1) The maximum river bank slope is 20%.
(2) Zero bank height is required.
(3) Water velocity should not be greater than 5 ft (1.53 m) per second.
(4) The minimum water depth must be at least 6 ft (1.8 m) for IRB-R and
3 ft 7 in. (1.1 m) for IRB-I to perform a controlled launch at the
maximum river bank slope of 20%. (This is based on a zero bank height
with the CBT backed into the water up to the top of its rear axle hubs
for interior bays, and up to the top of its rear axle tire rims for ramp
bays.)
AT MAXIMUM 5 FT (1.53 M) BANK
HEIGHT THE MINIMUM WATER DEPTH IS:
12 FT (3.7 M) FOR IRB-R
7 FT 4 IN. (2.2 M) FOR IRB-I
FREE LAUNCH
SLOPE
0–20%
BANK HEIGHT
0–5 FT (1.53 M)
9 FT (2.7 M) MINIMUM, IRB-R
6 FT (1.8 M) MINIMUM, IRB-I
VEHICLE MUST BE BACKED INTO WATER
SLOPE
0–20%
WATER DEPTH
6 FT (1.8 M) MINIMUM, IRB-R
3 FT 7 IN. (1.1 M) MINIMUM, IRB-I
CONTROLLED LAUNCH
