The Volutera Cozy Mark IV Project #1504 by Alexandre Souto

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Ballistic Recovery Parachute

Ballistic installation on a Cozy. I will try to show the steps.

I just will put the parachute in the aircraft when it`s finished.

The Cozy weights 2050lbs = 930kg. My recovery system supports 2160lbs = 980kg.

At 250km/h the aperture force is 4700kgf, multiplying by the security factor of 1,5, we have 7050kgf. This force divided by 3 points is 2350kgf in each.

 

23/08/2008

The streams are 7mm height and 40mm width.

I carved my longerons in 4mm, That`s not possible to cross the tapes without doing that.

The horizontal line is WL17.4. The vertical line is the IP, where finish the CozyGirrrl strake. The tape will run over the strake until the center section spar.

 

24/08/2008

I reinforced the F28 in ch04.

I decided to make the nose rounded, so I modified my F28 to the 4" in plans.

This will work to accommodate the ballistic in the front co-pilot foots area.

My longerons support one tension of 3760kgf. But the F28 supports only 600kgf. These are fibers aprox. calcs, when are some foam between the fibers these forces are multiplied n times.

I scheduled like this 1ply UNI carbon @0, 1ply BID de carbon @45, 1ply BID aramide @0/90, 1ply BID aramide @45 and 2ply UNI 7715@0. Extended over the doublers until 5" from F28.

I use the website to make my annotation. Sorry for that.

27/08/2008

To stiffening the F28 I put 2UNI of carbon tape.

After alignment of the canard I will put carbon in the front of F28.

 

That`s makes my F28 with a 3320kgf rupture force.

By the way, is not my F28 that will support all the forces involved in one ballistic aperture. Is one junction between F22, F28, IP and the bottom of the fuse. I will use aramide tapes to build these connections.

One more shot.

 

After the carbon tapes I put 1 tape BID @0/90 of aramide until the IP.

Over the aramide tape I laminated 1ply of aramide until 2" below the 4ply UNI canard reinforcements.

Below F28 I crossed the carbon and the aramide, the tie will be in the center of the bulkhead.

There are flox in the bottom of the F28 to make the curvature without air bubbles.

The thickness of carbon tape is 0,59mm, 2ply are 1,18mm, plus the aramide, so to conform I have to put the flox.

 

 

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