Moderadores: Lepanto, poliorcetes, Edu, Orel
During the development of the FAMAS, there was a huge work in France dedicated to optimizing stability during automatic firing, using modified 7.62 mm rifles, multibarreled 5.56 mm rifles, and other devices to study the reaction of the human body to high energy vibrations.
Accelerations and movements of shooter wrist, shoulder, torso and head were measured, and it was found that the "natural" oscillating frequencies of those body parts were all between 10 Hz and 20 Hz (depending on body part and shooter morphology), so if the rate of fire of the rifle was contained between those two limits, then resonance could occurs between the rifle movements and the shooter movements.
The conclusion was that automatic rifles should have a RoF below 600 rpm (10 Hz), or higher than 1200 rpm (20 Hz), for "optimum" controllability. You need also to have the rifle CoG exactly located on the bore axis, but with modular rifles that's a difficult task to fulfil this requirement with every possible shooting configuration.
For the FAMAS F1 firing the steel case F1A ammo, the selected RoF was higher than 1100 rpm, now for the FAMAS FELIN, with a chrome lined chamber and firing F5 brass case ammo, the RoF could be as high as 1350 rpm.
For the FAMAS MSD (an experimental program using caseless ammo, that should have replaced the original FAMAS around the mid-1990s), electric ignition was used so the RoF was continuously adjustable between 60 rpm and 400 rpm, mimicking fast semi-auto instead of a real "burst".
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