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tymkoder 0
Tom,
I agree that pilot chute oscillation is not a good thing and that every step that we take to make our jumps safer is a good thing.
but what are the actuall effects of an ascillating pilot chute on canopy opening? two scenarios
1.. I can see it making a impact on possible canopy horizontle movement.
I dont see the single attachment point making a difference in horizontal rotation. IE off heading opening. now given enough time and rotation if the bridle was allowed to spin up to a pint of binding then it might start to make a canopy rotate...
2.. on a canopy with a multi point bridle initially the effect would be the same. that is untill the velco peals and the attachment points become farther apart. now the ascillating or rotating piolt chute has the ability to actually "apply rotaional force"..
remeber we are talking about a very low canopy opeing speed and opening time.
Tom just looking for you to give some actuall real world report about the effect of an oscillating PC.
I agree that pilot chute oscillation is not a good thing and that every step that we take to make our jumps safer is a good thing.
but what are the actuall effects of an ascillating pilot chute on canopy opening? two scenarios
1.. I can see it making a impact on possible canopy horizontle movement.
I dont see the single attachment point making a difference in horizontal rotation. IE off heading opening. now given enough time and rotation if the bridle was allowed to spin up to a pint of binding then it might start to make a canopy rotate...
2.. on a canopy with a multi point bridle initially the effect would be the same. that is untill the velco peals and the attachment points become farther apart. now the ascillating or rotating piolt chute has the ability to actually "apply rotaional force"..
remeber we are talking about a very low canopy opeing speed and opening time.
Tom just looking for you to give some actuall real world report about the effect of an oscillating PC.
CHICKEN MAN
BASE 954
BASE 954
TomAiello 25
Have you seen the video clip in this thread?
A few thoughts:
We're not necessarily talking about a very low opening speed or time. This might be a terminal deployment, or it might be a go and throw.
If you watch the video linked, you can see that the canopy is being spun by the orbiting PC, despite the bridle not being "spun up" tight.
The negative effect of an orbiting PC is not a result of the bridle twisting. it's a result of the extraction force shifting directions. Imagine if you could do a PCA, and halfway through, run 20 feet to the left, then run back 20 feet to the right. It's a bit like that. The canopy moves toward the PC (or anchor point, if fixed). When the PC (or anchor point) moves, the canopy changes direction in mid-deployment. This can also lead to slack developing in the system while it moves to line stretch, as it changes directions.
The multi bridle slides--it doesn't necessarily peel. It can slide back up the lines and still remained mostly closed. That means that force can be exerted sideways (kind of like crossloading your risers by dipping a should during deployment) from the instant the PC reaches bridle stretch.
A few thoughts:
We're not necessarily talking about a very low opening speed or time. This might be a terminal deployment, or it might be a go and throw.
If you watch the video linked, you can see that the canopy is being spun by the orbiting PC, despite the bridle not being "spun up" tight.
The negative effect of an orbiting PC is not a result of the bridle twisting. it's a result of the extraction force shifting directions. Imagine if you could do a PCA, and halfway through, run 20 feet to the left, then run back 20 feet to the right. It's a bit like that. The canopy moves toward the PC (or anchor point, if fixed). When the PC (or anchor point) moves, the canopy changes direction in mid-deployment. This can also lead to slack developing in the system while it moves to line stretch, as it changes directions.
The multi bridle slides--it doesn't necessarily peel. It can slide back up the lines and still remained mostly closed. That means that force can be exerted sideways (kind of like crossloading your risers by dipping a should during deployment) from the instant the PC reaches bridle stretch.
tymkoder 0
Tom,
yes I did see it. I was just trying to get a little different thought from people on how a PC could possibly effect thier equipment setup.
a little devils advocate.
yes I did see it. I was just trying to get a little different thought from people on how a PC could possibly effect thier equipment setup.
a little devils advocate.
CHICKEN MAN
BASE 954
BASE 954
manship 0
QuoteHave you seen the video clip in this thread?
If you watch the video linked, you can see that the canopy is being spun by the orbiting PC, despite the bridle not being "spun up" tight.
How can you know that the canopy is being spun up by the orbitin PC. Perhaps the PC is being made to orbit by the slider up canopy opening and squirriling around, as they sometimes do.
t
==========================================
I didn't invent skydiving, but I jumped with the guys who did.
I didn't invent skydiving, but I jumped with the guys who did.
TomAiello 25
I can't know. The point was that the spin is not being transferred through a spun bridle.
I think few more bucks are a good choice for a lot of more safety...
3,2,1,C-YA!!!
V.
BASE #1075 / BMI #I-002 / PFI #042 / EGI #104
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