Tom’s Vashon Rocketry Site

Return to My Fleet


My Valhalla design is a three-motor cluster with a V-2 core motor and two V-1 side motors. This is not a parallel-staged design; the side motors stay attached to the core.

The core nose is a Vashon styrofoam cone. The side motor cones are custom turned balsa. The parachute compartment is made from a Vashon 4-inch aluminum tube and uses the same spring-loaded ejection I use in my Valkyrie-2b. The side motors also release parachutes. The white tube at the top of the model is a payload section made from Centuri-sized ST-9 tube (available from Semroc — it's a good replacement size for the Vashon payload tubes). The side motor parachute compartments are also ST-9 tubes.

Vashon recommend launching clustered models using electrical ignition, but I don't have enough of the special pyrofuze igniter wire Vashon used to do this. Also, I am wary of using electrical ignition with R-152a propellant. So, I'll be using a manual method with the three nozzle safety pins mounted on a carrier to pull them all simultaneously. With three motors thrusting, this bird should really move.

This model can also be used as a booster for an upper stage, but may need additional fins attached to the tips of the existing fins to be stable with a sustainer mounted on top. RockSim 8 can't properly calculate the stability of a model with side pods, so I'll have to figure out a way to swing test the model (which will be difficult because it's not practical to swing test a fueled model) before using it with an upper stage.

In Norse mythology, Valhalla is the hall to which Valkyries escort warriors who were slain gloriously in battle.

(Click on the picture for a larger image)

Return to My Fleet

Page last updated February 5, 2007