Honestly, a Single Tube might work if we make this thing fast and cheap enough.
Then again, I see the Arrowhead configuration as less of a Full Cruiser and more of a potential Frigate/Proto-Escort.
Have them operate in Squadrons/Packs being supported by heavier vessels(maybe even a refit Stingray or later Medium Cruiser?), and you can have them compensate for lack of Tubes by firing in concert on a single target.
Then again, I see the Arrowhead configuration as less of a Full Cruiser and more of a potential Frigate/Proto-Escort.
Have them operate in Squadrons/Packs being supported by heavier vessels(maybe even a refit Stingray or later Medium Cruiser?), and you can have them compensate for lack of Tubes by firing in concert on a single target.