Forums: Skydiving: Gear and Rigging:
Square reserve

 


Kevin116  (D License)

Oct 14, 2012, 8:16 AM
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Square reserve Can't Post

Worth a look. Manned square reserve test jumps and he stands it up! Riggers might see one of these.

http://www.youtube.com/watch?v=M8kVUMrjCLI


Genego  (D 10375)

Oct 14, 2012, 9:52 AM
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http://www.youtube.com/watch?v=M8kVUMrjCLI

Made it click for ya!


RiggerLee

Oct 14, 2012, 10:28 AM
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that's really interesting. Historicly we've played with some things like that with rounds. I wonder how it would do with out the paraglider attached. Ossolate more with out that damping? The inner lines give a sharper radious at the sides and might cause the air flow to break off at that point reduicing the ossilation but it's so damn short. Makes me wonder what the malfunction rate is like. Perticuarly hand deployed at low speed where there could be a cross wind component and with out any tension on the "apex" during opening. There's a good pic on there web site. Interesting choice of line and tape locations. I wonder if all the panels are just square and all the shape comes from the distortion or if the seam them togather with shape in the edges of the panel. Like to see one some day. The actually have some really inovative designs.

Lee


riggerrob  (D 14840)

Oct 14, 2012, 11:09 AM
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Re: [RiggerLee] Square reserve [In reply to] Can't Post

There is a youtube video/ computer simulation of its opening.
It is a shallow cross type canopy, similar to the U.s. Army's XT-11 static-line, paratrooper canopy.
The Orange Cross has a total of four apex(?) lines to flatten the canopy's profile.

It looks like all the panels are rectangular.

As for deployment reliability ... you can get away with a lot of errors at low speeds and light weights.

OTOH, the U.S. Army seems to have made the (cross type) XT-11 work at 130 knots and suspended weights of more than 250 pounds.


GGGGIO  (D 14774)

Oct 17, 2012, 9:42 AM
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Re: [riggerrob] Square reserve [In reply to] Can't Post

It's actually T-11 and 150kias @ 400# Wink


riggerrob  (D 14840)

Oct 21, 2012, 9:22 AM
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Pulling down the apex reduces inflated volume, speeding inflation.
It also increases inflated diameter, reducing descent rate.


riggerrob  (D 14840)

Oct 21, 2012, 9:43 AM
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Re: [RiggerLee] Square reserve [In reply to] Can't Post

In reply to:
.. . Ossolate more with out that damping? The inner lines give a sharper radius at the sides and might cause the air flow to break off at that point reduicing the ossilation but it's so damn short. ...

Lee

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

Videos show it descending smoothly.

Larger (T-11) and faster round canopies (drogues) have shown the need for vents at the equator to reduce osscilations.
Basically, equator vents force the airflow to stall/separate at a predictable point.


uberchris  (A License)

Oct 21, 2012, 2:49 PM
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Re: [Kevin116] Square reserve [In reply to] Can't Post

flystyle is working on something even better and from the rumors i heard its NOT going to be an outrageous price. yes its a vented BASE canopy

https://www.youtube.com/watch?v=idSokAaz0_A

http://www.theflystyle.com


mjosparky  (D 5476)

Oct 22, 2012, 3:22 AM
Post #9 of 11 (1414 views)
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Re: [uberchris] Square reserve [In reply to] Can't Post

In reply to:
flystyle is working on something even better and from the rumors i heard its NOT going to be an outrageous price. yes its a vented BASE canopy

https://www.youtube.com/watch?v=idSokAaz0_A

http://www.theflystyle.com

Vented ram air canopies came about years before BASE. Para Fites first canopies had vents in the mid 70s.

Sparky


riggerrob  (D 14840)

Oct 22, 2012, 9:41 AM
Post #10 of 11 (1346 views)
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Re: [mjosparky] Square reserve [In reply to] Can't Post

In reply to:
In reply to:
flystyle is working on something even better and from the rumors i heard its NOT going to be an outrageous price. yes its a vented BASE canopy

https://www.youtube.com/watch?v=idSokAaz0_A

http://www.theflystyle.com

Vented ram air canopies came about years before BASE. Para Fites first canopies had vents in the mid 70s.

Sparky

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

Supposedly Para-Flite's - bottom skin - vents were to "soften" cells, to reduce toggle pressure, when accuracy competitors hung in deep brakes.

OTOH vents in modern BASE canopies are to speed inflation at the bottom edge of the envelope.


mjosparky  (D 5476)

Oct 22, 2012, 9:07 PM
Post #11 of 11 (1267 views)
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Re: [riggerrob] Square reserve [In reply to] Can't Post

In reply to:
In reply to:
In reply to:
flystyle is working on something even better and from the rumors i heard its NOT going to be an outrageous price. yes its a vented BASE canopy

https://www.youtube.com/watch?v=idSokAaz0_A

http://www.theflystyle.com

Vented ram air canopies came about years before BASE. Para Fites first canopies had vents in the mid 70s.

Sparky

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

Supposedly Para-Flite's - bottom skin - vents were to "soften" cells, to reduce toggle pressure, when accuracy competitors hung in deep brakes.

OTOH vents in modern BASE canopies are to speed inflation at the bottom edge of the envelope.

Its not the first time someones idea was used in a different application.

Sparky



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