Forums: BASE Jumping: BASE Technical:
Non Venting Cells 1 and 7
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bedrok

Mar 19, 2017, 1:50 PM
Post #1 of 3 (781 views)
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Non Venting Cells 1 and 7 Can't Post

Why do base parachutes vent all cells besides 1 and 7? What happened when they tried venting every cell?

TomAiello

Mar 19, 2017, 5:33 PM
Post #2 of 3 (717 views)
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Re: [bedrok] Non Venting Cells 1 and 7 [In reply to] Can't Post

The prototype canopies I saw with vents on the outer cells seemed to have some heading issues, but mostly I think it was just that the gains from venting those last two outside cells were very limited.

Fledgling

Mar 19, 2017, 5:54 PM
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Re: [bedrok] Non Venting Cells 1 and 7 [In reply to] Can't Post

Firstly, All parachutes provide the vast majority of their lift from the center cells. The purpose of venting is to create an airfoil that pressurizes and begins flying sooner in its deployment. Hence venting the cells that will provide lift.
Secondly, If the end cell is first to inflate it will cause obvious heading issues. An obvious way to promote center cell inflation first is to simply not vent the outer cells.


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