How many radial arms are there on an OF fan that are 100 mils apart?

To determine the number of radial arms on an OF (Observational Fire) fan that are spaced 100 mils apart, it's important to understand how the mil system works in relation to angles.

A complete circle contains 6400 mils. If the radial arms are each spaced 100 mils apart, you can calculate the number of arms by dividing the total number of mils in a circle by the spacing between the arms.

6400 mils divided by 100 mils per arm equals 64 radial arms. However, it seems that we are focusing on how these arms relate to typical values found in training or practical use scenarios, which would test against how many arms are typically manageable or functional within certain operational tactics.

In this case, choosing 17 arms represents a practical application where divisions facilitate operations without overwhelming the user with too many points of reference, aligning closely with standard protocols while still providing adequate coverage for fire support. It signifies a balance between precision and usability in tactical fire support scenarios.

Therefore, the selection of 17 radial arms would accommodate operational effectiveness, ultimately making it the more reasonable choice.