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**Nosecone Separation Design**

The current nosecone separation system design will consist of a gas-tight parachute container and a conventionally sleeved nosecone. A cold gas generator could be located below the parachutes, which simplifies the wiring, plumbing, and nosecone interface considerably. A cold gas generator could be purchased from a third party such as Aerocon. <http://www.aeroconsystems.com/RTM/index.htm> A sample model drawn in solidworks is shown below.

![](separation_design.jpg)

**Fin Design**

The current fin design involves clamping four fins equally spaced at the bottom of the propulsion module. By tightening the fasteners on each fin, a compression fit is obtained.A sample model drawn in solidworks is shown below.

![](fin_design.jpg)

**Module Coupling Design**

The module coupling design consists of a coupler, roughly 2 inches in length, tightly fitting within the ends of the modules. A series of fasteners will sufficiently attach the coupler to the module. A sample model drawn in solidworks is shown below.

![](coupler_design.jpg)

**Materials**

Materials for the Aeroshell:

- Class C fiber glass
- Mylar
- 5 mil plastic paint tarp
- Weather stripping
- Epoxy
- Pigment
  - Aerospace Composite Products Pigment Paste ($6.00/2oz)
- Perforated plastic sheets
  - Aerospace Composite Products Perforated Release Film ($6/yard)
    <http://www.acp-composites.com/ACP-CAT.HTM> 800-811-2009
- Sand paper
- Paint
- Bolts for attaching to modules

Major Airframe components: (excludes parachute and related hardware)

- Aeroshell
  - 18" long fiberglass tubes ~5" I.D. ~1/16" wall
- Nosecone
  - Also fiberglass layup
- Nosecone separation system
  - No viable plan yet
- Modules
  - Aluminum tubing ~5" O.D. 1/8" wall
- Module couplers
  - Nesting aluminum tubing sections. Possibly minimum length (~2")
- Launch lugs
  - UHMW PE bobbins, assuming the launch rail system is the same.
- Fins
  - Fiberglass with four aluminum wrap-around clamps securing them.