Hall Bulldog CAD Modeling Progress - May 2021

Part of The Hall Bulldog Project — documenting Bob Hall's 1932 Thompson Trophy racer.

These CAD screenshots from Kevin Kimball document the Hall Bulldog wing component design progress as of May 2021. The images show the detailed work involved in creating manufacturable parts from the structural design, including CNC router-ready patterns for the plywood nose ribs.

CNC Router Patterns

One of the key advantages of modern CAD design is the ability to create precise CNC router patterns for wooden components. The nose ribs for the Hall Bulldog wing are cut from plywood sheets using a CNC router, ensuring consistent quality across all ribs while minimizing waste material.

Hall Bulldog nose rib CNC layout — CNC router layout showing nose rib patterns nested on plywood sheets

Hall Bulldog wing rib CAD detail — Detailed CAD view of wing rib components

Hall Bulldog wing structure CAD — Wing internal structure showing rib and spar arrangement

Wing Component Details

Each rib in the elliptical wing is unique due to the varying chord length and airfoil thickness along the span. The CAD model captures these variations precisely, allowing for accurate manufacturing of each component.

Hall Bulldog rib variations — Individual rib variations for the elliptical wing planform

Hall Bulldog wing CAD assembly — Wing assembly CAD model

Hall Bulldog wing spar CAD — Wing spar and internal structure detail

Hall Bulldog wing tip CAD — Wing tip bow and rib arrangement

About Kevin Kimball

Kevin Kimball of JKE Works in Mount Dora, Florida is the structural engineer for the Hall Bulldog replica project. His CAD work transforms the 3D surface models created by Mirco Pecorari into manufacturable structural components with proper engineering specifications.