Backstory

The G-RAG 3 is a 3-inch diamaeter launch vehicle built to loft the 3rd project of the Goshen Radios Aloft Group (G-RAG). G-RAG was a group of HAM radio and rocketry enthusiasts stared by my dad, Ken Horst, to help develop a real-time GPS telemetry package (see Payload below). It first flew in 2001. The GPS telemetry project was featured in the January/February issue of Sport Rocketry in 2002. It had several other successful flights on J&K motors with a variety of payload configurations. The rocket was retired after losing a fin to a hard landing in the Nevada desert at LDRS 26 (2007).

Payload

G-RAG 3 payload
Avionics (dual BlackSky AltAcc) & telemetry package.

We wanted to have real-time GPS telemetry while the rocket was in flight. To do this with off-the-shelf components in 2001 required:

Telemetry Package

Ground Station

It took a few iterations to get this right but, in the end, we were able to get GPS coordinate readings from the rocket to the ground station every second.

Specifications

Make
Scratch-built
Class
Level 2
Configuration
Single motor
Nose cone
Shape
Ogive
Material
Plastic
Airframe
Diameter
75mm
Material
Phenolic
Reinforcement
Kevlar
Fiberglass
Fins
Count
3
Material
Laminate
Airfoil
Double-wedge
Reinforcement
Fiberglass
Motor Mount
Diameter
54mm
Centering Rings
Plywood
Recovery
Dual deployment
Avionics
Dual altimeter
Tracking beacon
GPS telemetry