Re: [lowcountryBase] Which canopy for WS BASE
lowcountryBase wrote:
Just for numbers sake I would imagine the weight of a lightweight canopy is half the weight of a normal canopy so wouldn't a larger pilot chute with more external force do more damage/open a lighter canopy faster than a heavier canopy or is that a fallacy?
no and yes.
more damage -> peak in force from PC to bridle attachment point, canopy, lines, etc. happens right when it hits linestretch. so so given that the load on the system varies with speed and PC size, no matter what canopy inbetween you and the PC.
open faster -> if by "open" you mean the time it takes to linestretch. yes, of course. and thats actually the critical part. you want to have the PC pull the canopy out reasonably fast, because if it does that too slow the canopy can do all kinds of weird shit on the way to linestretch (like twist and probably catch air here or there). and on the other side, if the PC is too big it ends up ripping the packjob apart when it lifts the canopy off your back, stretching out the centercell, which then again can lead to linedumps, and quite some length differentials in linegroups, etc.
i know that bill booth back in the days did quite a load of experiments to find a rule of thumb for the right pilotchute size, and ended up with a certain timespan (some fraction of a second, i would have to dig it up how much exactly) for getting canopy off and to linestretch, that is the sweetspot for the best malfunction rate.
i do think that the PC/delay tables that manufacturers offer were not pulled out of thin air, and i guess they all did their testing. but now with a huge variety of sizes and also different materials, and even more important, tracking and wingsuiting, those are a good starting point, but if your tracker/wingsuiter just film a few of your openings and see what goes on, since both tracking and wingsuiting speeds can differ massively depending on the jumper and its flying style.
so what i want to say here, nobody can take that testing off of you, you have to do it yourself.