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Ultimate low freefall PC
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nbpmich87

Jul 12, 2017, 8:35 AM
Post #1 of 41 (1363 views)
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Ultimate low freefall PC Can't Post

If you could build the ultimate low freefall pilot chute how would it be built?

For low freefall only so disregard longevity, or use in any other application.

Load tapes: how many? mesh only or also on topskin?

Bias vs Block built

size: 48 or 52? Bigger?

Other considerations worth mentioning?

Thanks

TomAiello

Jul 12, 2017, 1:39 PM
Post #2 of 41 (1221 views)
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Re: [nbpmich87] Ultimate low freefall PC [In reply to] Can't Post

Solid object?

Fledgling

Jul 12, 2017, 5:27 PM
Post #3 of 41 (1175 views)
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Re: [nbpmich87] Ultimate low freefall PC [In reply to] Can't Post

What do you consider to be "Low" free fall?

nbpmich87

Jul 12, 2017, 6:03 PM
Post #4 of 41 (1156 views)
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Re: [Fledgling] Ultimate low freefall PC [In reply to] Can't Post

Under 200' or as low as possible. Not that I'll be jumping that low. But if you were to jump the lowest object physically possible and could build a PC however you wanted how would you build it.

nbpmich87

Jul 12, 2017, 6:05 PM
Post #5 of 41 (1154 views)
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Re: [TomAiello] Ultimate low freefall PC [In reply to] Can't Post

Solid objects or not but I guess I was thinking E or A

hjumper33
Moderator
Jul 12, 2017, 6:56 PM
Post #6 of 41 (1139 views)
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Re: [nbpmich87] Ultimate low freefall PC [In reply to] Can't Post

I guess I'd go 6 tapes, small mesh ring vent for stability while still having zp at the apex. I might even name it something like "nuclear" because it would kind of look like a toxic waste symbol ;)

I'd go for a 46 in size, maybe 48. Seems to be about the size where unless you're able to sprint and pre-inflate, you start to reach the point of diminishing returns for pc inflation time/ distance to enough snatch force to do what you want.

Zp non vented might be a tad faster, but off of low solid objects I'd start worrying about heading performance.

I'm the attached picture, the seams on the ring vent are on block. Most pilot chutes are a single piece of material, so it's hard to say it's really built on block of bias as there are likely more than 4 tapes. I'm not sure that on that small of a piece of material with as many tapes as are present that there is a huge amount of difference in each panel (gore) like on a big round. Someone smarter than me probably has a better answer about that though.


(This post was edited by hjumper33 on Jul 12, 2017, 7:04 PM)
Attachments: IMG_6389.JPG (1.49 MB)

GreenMachine

Jul 13, 2017, 3:14 AM
Post #7 of 41 (1043 views)
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Crowd Sourcing R & D ?? [In reply to] Can't Post

Solid Object versus Tail Wind might affect
one's decision to use a vent, so far I have
seen four different types of vents . . .

Options for Type of Material changes when
you add the caveat of ONLY ONE JUMP . . .

As for Size, I could do a dissertation on the
topic, but the four variables I would want
to know before I answered is the jumper's
exit weight, canopy details, field elevation,
and yes even the expected temperature.

As in the perfect PC for Jesse Hall to freefall
a 150 foot antenna in Tallahassee in Winter
is different than the ideal PC for Tree to
freefall a low cliff in Moab in Summer...

nbpmich87

Jul 13, 2017, 4:07 AM
Post #8 of 41 (1024 views)
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Re: [hjumper33] Ultimate low freefall PC [In reply to] Can't Post

Thank you, I appreciate the response. So basically your saying it already exists and a toxic is the tool for the job. I was just wondering if anyone has any crazy ideas on how to improve on it.

nbpmich87

Jul 13, 2017, 4:13 AM
Post #9 of 41 (1019 views)
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Re: [GreenMachine] Crowd Sourcing R & D ?? [In reply to] Can't Post

Ok so I definitely wasn't specific enough with my original question

How about 65F at sea level, 150lb jumper with a 225 OSP, running exit off Antenna in zero wind conditions.

gharrop

Jul 13, 2017, 4:44 AM
Post #10 of 41 (1009 views)
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Re: [nbpmich87] Crowd Sourcing R & D ?? [In reply to] Can't Post

48'' F111 works for 43m :) https://youtu.be/gIbBSgBzIwM?t=126

hjumper33
Moderator
Jul 13, 2017, 4:45 AM
Post #11 of 41 (1006 views)
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Re: [nbpmich87] Ultimate low freefall PC [In reply to] Can't Post

It's weird, almost everything in base has a lot of brand loyalty, but lots of people jumping non asylum gear still love toxics. I think they're fantastic. With your gear, free falling 200 ft and even down to 180 shouldn't be an issue with most standard apex vented pilot chutes. I used a standard 46 for most of my low freefalls.

nbpmich87

Jul 13, 2017, 5:46 AM
Post #12 of 41 (986 views)
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Re: [gharrop] Crowd Sourcing R & D ?? [In reply to] Can't Post

That PCA 180 looked like it hurt lol nice landing area too

nbpmich87

Jul 13, 2017, 5:52 AM
Post #13 of 41 (980 views)
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Re: [hjumper33] Ultimate low freefall PC [In reply to] Can't Post

Good to know and thanks for the advice. I have a 42" toxic and love it. so say we change the scenario slightly and now I'm stepping off with an underhand toss PC S folded all the way. would I then benefit from a 48" with my weight and gear or do you think I would still be better off with a 46"?

Also have people pretty much decided that 52" is not beneficial anymore? after reading DW ultra low freefall writeup many times it seems like it may really depend on your setup whether it will help or hurt your opening height.

wasatchrider

Jul 13, 2017, 6:32 AM
Post #14 of 41 (955 views)
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Re: [nbpmich87] Crowd Sourcing R & D ?? [In reply to] Can't Post

nbpmich87 wrote:
Ok so I definitely wasn't specific enough with my original question

How about 65F at sea level, 150lb jumper with a 225 OSP, running exit off Antenna in zero wind conditions.

Sounds like a pretty fucking dumb idea

nbpmich87

Jul 13, 2017, 6:52 AM
Post #15 of 41 (950 views)
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Re: [wasatchrider] Crowd Sourcing R & D ?? [In reply to] Can't Post

Its just a scenario but thanks for your input. also are you suggesting people don't jump freestanding antennas in low to no wind conditions? cause I imagine it happens quite frequently...

Also just to clarify once again I have no specific jump in mind. I'm just looking for positive suggestions as to what could be done to build the ultimate low freefall PC. if you have ideas crazy, far-fetched, or whatever I would like to hear them.

hjumper33
Moderator
Jul 13, 2017, 6:54 AM
Post #16 of 41 (947 views)
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Re: [nbpmich87] Crowd Sourcing R & D ?? [In reply to] Can't Post

All depends what 65F means

nbpmich87

Jul 13, 2017, 7:04 AM
Post #17 of 41 (942 views)
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Re: [hjumper33] Crowd Sourcing R & D ?? [In reply to] Can't Post

ok sorry 65F is 65 degrees Fahrenheit... it has nothing to do with the height of the object lol I was responding to GreenMachine and he asked for specifics on the scenario regarding Jumper, gear, ASL, Temperature. I thought 65F was pretty clear. As far as I believe to FF 65 feet you wouldn't need a PC or any other gear for that matter because it wouldn't help...


(This post was edited by nbpmich87 on Jul 13, 2017, 7:08 AM)

TomAiello

Jul 13, 2017, 7:52 AM
Post #18 of 41 (918 views)
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Re: [nbpmich87] Ultimate low freefall PC [In reply to] Can't Post

If you're only using it once, you could just use a rocket deployment system, maybe with some kind of ballistic spreader for the canopy.

I think the rocket deployment system that Peter Gambs had cost something around $1000 per deployment, but I saw video of him getting full inflation from things that were probably low enough to survive (landing on solid ground) without a parachute.

nbpmich87

Jul 13, 2017, 9:00 AM
Post #19 of 41 (896 views)
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Re: [TomAiello] Ultimate low freefall PC [In reply to] Can't Post

hahahaha now this is what I am talking about

platypii

Jul 13, 2017, 9:30 AM
Post #20 of 41 (875 views)
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Re: [nbpmich87] Crowd Sourcing R & D ?? [In reply to] Can't Post



Attachments: balloon1.jpg (127 KB)
  balloon2.jpg (136 KB)

nbpmich87

Jul 13, 2017, 10:15 AM
Post #21 of 41 (856 views)
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Re: [platypii] Crowd Sourcing R & D ?? [In reply to] Can't Post

Any video of this anywhere? I seen that picture a while back. looks like a cool idea but how did it work in reality?

platypii

Jul 13, 2017, 10:25 AM
Post #22 of 41 (837 views)
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Re: [nbpmich87] Crowd Sourcing R & D ?? [In reply to] Can't Post

It's not my pics. I would like to see video too.

wasatchrider

Jul 13, 2017, 11:42 AM
Post #23 of 41 (802 views)
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Re: [hjumper33] Crowd Sourcing R & D ?? [In reply to] Can't Post

hjumper33 wrote:
All depends what 65F means

Yeah I thought he meant feet

c_dog

Jul 13, 2017, 5:04 PM
Post #24 of 41 (721 views)
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Re: [platypii] Crowd Sourcing R & D ?? [In reply to] Can't Post

Handsome dude.

Bealio

Jul 13, 2017, 6:31 PM
Post #25 of 41 (679 views)
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Re: [c_dog] Crowd Sourcing R & D ?? [In reply to] Can't Post

Extremely handsome!

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