Statistical methods for gene expression arrays

A model air rocket assembly includes a finless cylindrical body of substantially uniform diameter. The assembly comprises a nose cone, an intermediate canister tube and a lower body tube. The engine is positioned in an engine tube held concentrically within the canister tube. The engine tube extends down to approximately the lower edge of the canister tube and openings are arranged around the lower portion of the canister tube to admit air which augments the engine thrust through the body tube and provides aerodynamic stability.