Hanging from the ceiling of MOHAI in Seattle is a hydroplane, Slo-Mo-Shun IV.  According to the museum information, this boat brought innovative design concepts to hulls that continue to be relevant to current boats.  It is quite a striking looking boat and will have been cool to see in action.  August in Seattle is Seafair time so the latest generation of boats will be competing, but this one is now preserved in pristine condition.