VIDAR III

OVERVIEW

Vidar III is the third iteration of the Vidar launch vehicle, featuring significant changes to the oxidizer feed system. These changes include redesigned injector and ignition subsystems. This is the first Vidar rocket to feature a functional payload, which is implemented in accordance with the PocketQube standard. Vidar III was the first of the team's vehicles to achieve a successful launch and recovery, at the 2017 IREC.

SPECS

Wet Mass: 63.1 lbs

Diameter: 4"
Length: 128.5"

Motor Classification: M

Fuel: Aluminized HTPB
Oxidizer: Nitrous Oxide

Drogue Chute Diameter: 37.5"
Main Chute Diameter: 98"

DETAILS

PAYLOAD

The payload of Vidar III contains an 8.8 pound dead weight in order to fulfill competition requirements. Additionally, the rocket is equipped with a small functional payload including a GoPro, accelerometer, and gyroscope.

AVIONICS

Our avionics module houses two commercial Raven altimeters. Furthermore, there is a GPS module on the rocket for recovery purposes. These electronics are activated by magnetic switches and can be armed and disarmed while the rocket is on the pad.

RECOVERY MODULE

The recovery module consists of a drogue parachute and main parachute housed in a single fiberglass bay. At apogee, the avionics altimeters initiate deployment. CO2 canisters pressurize the recovery module, splitting the rocket and deploying the drogue parachute. At 1500 ft, a secondary electrical signal triggers pyrocutters that deploy the main parachute. The drogue parachute pulls the main parachute out from the recovery module and slows the rocket to 8 m/s.

RUN TANK

The Vidar III oxidizer tank is constructed from aluminum. The tank wall fulfills a secondary purpose as the structural airframe, saving weight and increasing stability. The run tank is designed for pressures of 750 psi, with a safety factor of 2.5. It is sealed on each end by a machined aluminum bulkhead. The top bulkhead has a permanent vent, as well as a dip tube to control ullage in the tank. The run tank is filled from the bottom bulkhead, where a hose can connect to the rocket through the outside of the bulkhead.

COMBUSTION CHAMBER

The combustion chamber houses the rocket's solid fuel. Like the oxidizer tank, it is made of 6061-T6 aluminum at a 4" OD. The fuel grain consists of aluminized HTPB cast inside an ABS tube, with a pseudo-finocyl grain geometry. The nozzle is machined from graphite.

FINS

The fin can is constructed from aluminum, with dimensions determined based on flight simulation using data from static testing. Vidar III uses three trapezoidal fins, which are welded to the can that slips over the combustion chamber.

NOSECONE

The nosecone is an elliptical shape, with a length of 8". The elliptical shape was chosen because the rocket is expected to remain subsonic. It is machined out of pine wood, and coated with epoxy.

PHOTO GALLERY

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