Entanglement devices

[Ocracoke]

I wouldn't have thought so, untethered devices (wherever or not they were entanglement devices) are specifically prohibited under 12.6:

12.6 Untethered Projectiles
Projectiles must have a tether capable of stopping the projectile at full speed and be no longer than 2.5m.

The Robot Wars Series 10 rules say this about entanglement:

14.2 Entanglement
Devices designed specifically to entangle other weapons are permitted under the follow conditions:

14.2.1 Separation
Entanglement devices must not cause two or more robots to be entangled together to the point where a battle requires intervention in order for it to continue.

...but even with that, they still have to have a tether if launched as a projectile under rule 13.5, which reads the same as 12.6 from the FRA ruleset.