This pattern for a double suction fully enclosed impeller includes a 1/2 pattern, centre core box, dryer, and L/R hand segmental core boxes. Materials: pine, mahogany and Baltic birch ply. Size: approx 24″ O.D. Sorry about the poor photo quality.
Pictures below from a recently commissioned loose vane open impeller pattern. The hub and shroud are made from RenShape and the vanes are cast polyurethane resin. The outside diameter is approximately 15 inches.
This is a loose vane pattern for an open style Ingersoll-Rand impeller.
The master vane was CNC machined to ensure accuracy to the original part, as well as a perfect fit in the hub. Duplicates are cast poly-urethane.
Here is the worn OEM part from which the pattern was reverse engineered:
And the finished part: