140 m/s is about 450 fps. 9.6v battery is too low in voltage if you want an increased ROF. Try looking at 10.8v or 12v. But, with that ROF AND that velocity, expect to have to compromise somewhere. Torque-up gears will slow the ROF as it trades speed for torque.
You may want to look at a dedicated hi-speed set-up, but you'll be limited to sub-400 fps if you want longevity out of the system.
Post your location as well.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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