FWIW, here is how I organize it
a) Wing Chun/early Jun Fan Straight Blast: Done with shuffle footwork. 2-3 strikes per step. When the range is already closed and an opening is created by a hit, it can be very effective. Potential drawbacks: forward pressure may not be enough in many situations, temptation to start it from too far away/without a prior hit. Given the great exposure of the jaw to a counter hook, Plan A had better work.
b) Later Jun Fan/JKD Straight Blast see e.g. Paul Vunak: The difference here is that the footwork is a natural sprint, so forward pressure is far greater. This is a good thing. Again 2-3 strikes per step. Again Plan A had better work or a counter hook can be very bad. Again the temptation to start from too far away/without a prior hit. The temptation can be all the greater because it can often work without a prior hit. Against an opponent who moves his head well, weave and shoot becomes a risk in addition to the hook.
c) The Boxing Blast: see e.g Vitor Belfort vs. Vanderlei Silva or the footage in this thread of Lyoto Machida or various current MMA fighters : Same footwork/forward pressure as the JKD Straight Blast, but only one strike per step, but because the punch is a boxing type punch instead of a vertical punch, the shoulders naturally cover the jaw or more readily can flinch to cover the jaw. see e.g. the Lyoto clip in this thread.
d) Recently I have developed what I call "the Rabid Blast". Like the WC/JF and the JKD Straight Blasts it seeks to impose neurological overload by punching three strikes per step (well two strikes and a sector framing strike to be specific
). Like the JKD SB and the Boxing Blast it seeks to impose strong forward pressure, though the footwork prefers to zig zag ("sawtooth" in our terminology) unless the opponent is so on his heels that a straight line is required to keep up with him. Like the Boxing Blast is seeks to keep the jaw protected; though in my opinion it does so to a greater degree. Ideally weave and shoot counters are partially dealt with by using the angle created by the sawtooth footwork, often in conjunction with what we call a "silat gator roll". Because of our concerns about striking the skull with our fists, the strikes are heel palm. The nature of the strikes overlaps with old school boxing, but is neither vertical fist nor boxing.
The chambers from which they initiate are different (think the double stick chamber we call the Arf-arful Dodger) and rhythmically they are a bit different too; I may be mistaken but at the moment I think the rhythm is in 6/8.