b. Fortifications. When firing at a fortified position, flame must be directed into openings (gun ports, firing slits, ventilation screens, doorways). Flame inside gives the desired effects, but flame on the outside has little effect on personnel within.
c. Thickened fuel. (Figs [3] and [20]) When firing at or near maximum range, it may take several seconds for a burst of thickened fuel to carry through the air to the target area. Short bursts may result in misses at long range for this reason. Skill in aiming is particularly important with thickened fuel.
d. Liquid fuel. With liquid fuel, the greatest effect may be obtained by placing the flame directly on the target. ([Fig 21])
Fig 20. Thickened fuel flame hitting and clinging to target. Fuel burns for several minutes.
Fig 21. Flame (liquid fuel) hitting target.