Re: [JacobG] 42' pilot chute - vented or not
JacobG wrote:
correct me if im wrong, but - All the vent is doing is keeping the air from spilling out the sides as bad, instead of the sides (which will cause it to ossulate) it is spilling from the apex (which reduces ossulation), the same rate it would be spilling from the sides... you have the same ammount of pulling force as a none vented 42" as you would with a 42"vented.
A central (apex) vent will also theoretically increase the chance of a PC hesitation, because the initial airflow through the center of the PC can pass cleanly through without "popping" open the ZP material. If you have a ring vent (like a toxic, for example, but also, although to a lesser extent, like a vented PC with a handle over the center of the vent) placed further out, it ought to address this issue because the vent is not letting the initial airflow escape (and isn't really a factor until the ZP has already popped open).
Inflation mechanics are probably more important than pull force for most modern BASE PC's (because most modern BASE PC's will accomplish the pull force requirements with no real issues).
If you are looking for a PC that won't oscillate, F-111 is almost always going to outperform ZP (regardless of vents), but there are other issues (service lifetime and hesitation rate) on F-111.
I really like the Toxic PC's, but if you put a hole in the PC on a landing, you're going to cry twice as hard if it's a Toxic.