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- Newsgroups: rec.skydiving
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!zaphod.mps.ohio-state.edu!cs.utexas.edu!bcm!aio!tegan!horn
- From: horn@tegan.jsc.nasa.gov (Mark Horn)
- Subject: Re: 7 or 9 Cell?
- Message-ID: <1992Nov23.172111.26347@aio.jsc.nasa.gov>
- Sender: news@aio.jsc.nasa.gov (USENET News System)
- Organization: NASA Johnson Space Center
- References: <577.2B10E5C3@ehsnet.fidonet.org>
- Date: Mon, 23 Nov 1992 17:21:11 GMT
- Lines: 28
-
- In article <577.2B10E5C3@ehsnet.fidonet.org> skydive@ehsnet.fidonet.org writes:
- >7 cells are good for CRW mostly because everybody that does CREW has a 7 cell!
- >actually, theres a little more to it than that, but not much.
-
- 9 cells also have a higher aspect ratio. The aspect ratio is the length
- measured from end cell to end cell (called the span) divided by the length
- measured from nose to tail (called the chord) Higher aspect ratio canopies
- have different collapsing characteristics. For example they're much easier to
- horseshoe than canopies with a lower aspect ratio.
-
- > 9 cells typically fly with more foreward spd. than a 7cell, -making them MUCH
- >more fun to fly, and land.
-
- This is true. But it makes for a dangerous CRW combination. Use your
- imagination: a fast flying canopy that doesn't take much effort to get the
- ends to flail around. Now put a persons body in front of it. The potential
- for a wrap is dramatically increased.
-
- If you're interested in CRW, you have to consider carefully whether or not you
- want to get a 9 cell. I know people who do CRW with 9 cells. I also know
- some serious CRW enthusiasts who will not do CRW unless there are only 7 cells
- in the formation. Their theory of operation is that CRW is difficult and
- dangerous enough by itself. There's no need to add a (relatively) unstable
- canopy to the complexity.
-
- Blue skies,
- - sparkie
- horn@mickey.jsc.nasa.gov
-