XTR is proud to partner with Hydrodynamica, the original source of Bob Simmons-inspired planing hull design in the modern era. Since 2002, Hydrodynamica has been dedicated to reviving and evolving Simmons’ revolutionary planing hulls, blending historical design with modern craftsmanship. Every Hydrodynamica board is meticulously handcrafted in San Diego, California, preserving the signature glide, flow, and planing power that defines the Simmons lineage.

As a exclusive licensed manufacturer, XTR is able to offer Hydrodynamica boards in both traditional PU (Polyurethane) construction and XTR’s patented closed-cell epoxy technology—giving you the choice of classic feel or enhanced durability and responsiveness.

PU Orders: Please use the Order a Board Form, select "wood stringer" for your construction, and write "PU order" in the notes section.

XTR Orders: Please use the Order a Board Form.

For questions or wholesale inquiries, contact us through our Contact Page.

Hydrodynamica models we can make in XTR's Epoxy technology or PU:
✔️ GMM 2
✔️ CyberSim
✔️ Mini Simmons
✔️ Slimmons
✔️ Mini 3
✔️ Custom Model