Thread by @JakOSpades

🧵So a few weeks ago, I got to try out IWI's Arbel, a computerised electronic fire control system, that unlike other FCS', does not rely on a electro-optical based solution.

https://twitter.com/JakOSpades/status/1775779044841197614

The Arbel system exists in two forms: a lower receiver for the Arad (and other AR pattern rifles) and a pistol grip module for the Negev family of MGs.

So how does the system work ? All it's doing is just slowing down the RoF, right ? Well not quite. There is a bit more going on. The heart of Arbel is a MEMS unit paired with a computing unit and a proprietary algorithm.

The MEMS unit has a couple of sensors onboard (accelerometer, magnetometer, gyro) that take readings up until the point you fire your first round. Directional data is converted to a vector value and stored aboard the system's memory. Essentially creating a direction of fire.

As you hold down the trigger, the system continues taking readings and creating directional data. This data is compared in real time to the original vector value, and the sear is automatically released when those values match.

Now the algorithm generates a passing zone and firing boundaries around that original vector value, allowing you to track and lead moving targets for example.

The origins of the system date from an IDF study into increasing the hit probability of follow-up rounds in short time windows (around 3 seconds). Studies showed that the first round fired was usually on or near the target, but the follow-ups would often miss.

This was due to several factors: recoil control, trigger control, stress, elevated heart and breathing rates... The first shot taken in 'Arbel mode' (a position on the selector) is completely unaided. The system only starts regulating the cadence for all the follow-up shots.

As soon as you let off the trigger, the system resets, and a new vector value can be generated for the subsequent engagement.

The system has been tested on the Negev up to 500 m with relatively impressive results:

And of course the potential application in the small C-UAS role is very topical right now. An interesting bit of tech !