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browncow

chopped main descent rate

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If you hang in deep brakes after a cutaway, you land about the same time as your freebag and slightly before your main.

This suggests a cutaway main descends about as fast as a canopy in brakes.

Having flown around other people's cutaway mains a few times confirms this.

If you need a number, I would say 10-15 feet per second, but the variation is probably quite wide.

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I'd say there are plenty variables involved.

I have 20 cutaways. Sometimes the main is down WAY before me. Sometimes I can't stay with it regardless of how much/long I stay on brakes. Freebags can be more consistant, but sometimes they telescope into themselves and go really fast.

t
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Highly variable. The thing is changing positions all the time and will sometimes partially inflate on the way down. It also depends on the air, I've seen a cutaway main literally hang in the air on a thermal for about 15-20 minutes.

Most of the time, it seems to land close to the same time as the person who cut away.

"Life is a temporary victory over the causes which induce death." - Sylvester Graham

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It obviously goes without saying that it varries highly on the type of malfunction that was cutaway. Obviously a baglock will beat a fully inflated wing that was cutaway due to linetwists to the ground any day.
God made firefighters so paramedics would have heroes...and someone can put out the trailer fires.

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Like folks up thread have said... its tough to say / depends on a lot of things. Generally, I'd agree with BH that said at chopped main comes down about as fast as a canopy in deep brakes, but that too depends on what kind of canopy it is you're in deep brakes under... :S

Anyway, I've chased down many a person's cut-away main and freebag and two of my own. Chopped mains can do some really weird shit as they're falling. Freebags / pilot chutes are more predictable, but I've seen them come out of the sky like a rock if once the reserve is out of the bag, the bag and bridle tangle up with the pilot chute and choke it... conversly, I've seen freebags / reserve pilot chutes go nearly miles on a windy day if the reserve pilot chute stays inflated.

If I'm chasing someones trash down and I see both the chopped main and freebag / reserve PC, I tend to try to land closer to the freebag / reserve PC and keep an eye on where the chopped main is going to land relative to where the freebag/PC go... all things being equal, good landing area, etc... since the freebag/PC is the smaller of the two and tend to "hide" better under bushes and such after landing... :D

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As others said, descent rate of a chopped main varies a lot.

Last weekend when spotting for an intentional cutaway, the chopped main (a big 190 square footer) descended very roughly about 60 % faster than the wind drift indicator did -- but who knows how fast the WDI had really descended. This came from checking the start and landing locations & altitudes for both.

That seems maybe a little fast, if compared to what people are saying about staying with a chopped canopy in deep brakes (...depending on one's own canopy too). But when following a main, people may be making wide turns or a tighter spiralling turn, complicating the issue.

For intentional cutaways, I'm more concerned with the amount of drift. Based on that one data point, the next time when I determine the regular 'spot' with a WDI from 2500', that spot may be about right for a cutaway with a bigger canopy at about 4000'. I don't have much data yet but that'll be my starting point.

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Quote

It obviously goes without saying that it varries highly on the type of malfunction that was cutaway. Obviously a baglock will beat a fully inflated wing that was cutaway due to linetwists to the ground any day.



Yep. Mostly open canopy - very slow. Tangled ball of shit - pretty fast.

For what its worth, I once saw a cutaway baglock clang off someone's truck hood. Made a pretty good dent in it. :o:D
"Mediocre people don't like high achievers, and high achievers don't like mediocre people." - SIX TIME National Champion coach Nick Saban

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