Forums: BASE Jumping: BASE Technical:
PCA vs. HandHeld 48'' vs. Stowed 42''
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spu

Jul 23, 2021, 3:02 AM
Post #1 of 6 (941 views)
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PCA vs. HandHeld 48'' vs. Stowed 42'' Can't Post

Wanted to share, might be interesting to someone.

Motivation: Preparing to jump new object, with good Plan A landing, sketchy Plans B-C-D. Urban enviroment - exit point not on corner of the building.

48'' PC is Pitch, 42'' PC is Snatch - jumps from 140-160m objects

Weight 75kg with gear, 245 ft2 Atair Vision canopy

Exit usually downwind, but should not matter for vertical speed end general feeling for canopy time.

Decided to go with PCA first times, and then based on experience go with 48'' no delay. 42'' and longer delay seems just too sketchy.

Cheers

edit - forgot to mention, all with deep brake settings from manufacturer


(This post was edited by spu on Jul 23, 2021, 3:08 AM)
Attachments: PCA-Handheld-Stowed.JPG (168 KB)

apgarcia90

Jul 23, 2021, 10:26 PM
Post #2 of 6 (888 views)
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Re: [spu] PCA vs. HandHeld 48'' vs. Stowed 42'' [In reply to] Can't Post

Thanks for sharing. What are you using to log data?

spu

Jul 24, 2021, 1:13 AM
Post #3 of 6 (882 views)
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Re: [apgarcia90] PCA vs. HandHeld 48'' vs. Stowed 42'' [In reply to] Can't Post

It is Flysight GPS data. Also on FB someone mentioned the Above Sea Level heights:

*Croatia Jumps - 200m ASL
*Rest - 400m ASL
*planned jump - 150m ASL

epibase

Jul 29, 2021, 9:52 AM
Post #4 of 6 (749 views)
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Re: [spu] PCA vs. HandHeld 48'' vs. Stowed 42'' [In reply to] Can't Post

42" stowed will be fine from 140m, depending how far your LZ is.. I jump a building often that is 130m and take 2-2.5 delays all the time.
When I jumped the cliff near Split, it was 90m I believe.. I used 42" handheld.

Hajo

Jul 30, 2021, 4:22 AM
Post #5 of 6 (707 views)
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Re: [spu] PCA vs. HandHeld 48'' vs. Stowed 42'' [In reply to] Can't Post

spu wrote:
Wanted to share, might be interesting to someone.

Motivation: Preparing to jump new object, with good Plan A landing, sketchy Plans B-C-D. Urban enviroment - exit point not on corner of the building.

................................................................

Exit usually downwind, but should not matter for vertical speed end general feeling for canopy time.

Nothing to do for the question about PC size but have a look at this, because you mentioned "not at corner" and "downwind".
Of course it depends on the windspeed, but might be helpful ...
https://www.youtube.com/watch?v=OuQl31JqwUk
Is about wind at buildings, at 0:22 it is a good visual.
Of course if you mean a round building, it differs ...

Just my 50 cents

spu

Aug 4, 2021, 4:28 AM
Post #6 of 6 (514 views)
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Re: [Hajo] PCA vs. HandHeld 48'' vs. Stowed 42'' [In reply to] Can't Post

@Hajo

Nice visualisation of air flow! Thanks for the video.

Yeah this building has a real funky design with a "tunnel" in the middle between two buildings. I used to live there so I know already that this is basically no wind jump.

Downwind I meant for the stats, when I jumped this other antenna-like objects. This 90m building jump must be no wind situation.


@epibase

Yeah for me the problem is that I jump it first time, and try to figure out how to give myself as much of a reserve as possible. Think after PCA/Static line would go handheld with a 48 for go and throw for sure. 42 I see no point if I am not making any delays. Seen on youtube plenty of shit where people go 90m stowed with 2sec delay, but the canopy time is really short for my experience atm.

Update: Went great! Just like planned :)


(This post was edited by spu on Aug 12, 2021, 10:46 AM)


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