Cherry on Balsa Wood Supercar Took Over 10 Years to Build

Cherry on Balsa Wood SupercarAn industrial designer has spent 10 years and 20,000 working hours constructing the Harmon Splinter – the coolest wooden car in the world. Joe Harmon’s Splinter supercar is high-performance, mid-engined and built from wood composites. The body and chassis, along with suspension components, wheels, interior, are all constructed of wood.

“Wood is our only naturally renewable building material; it takes an extraordinarily small amount of energy to produce and is totally biodegradable,” says Harmon on his website.  “With a better strength-to-weight ratio than steel and aluminum, it can be made into a lot more things than people tend to give it credit for.  We wanted to push the line on what was considered wood’s limitation as a building material while fulfilling a lifelong dream of designing and building a car from scratch.”  Maple, ash, birch, hickory, cherry, walnut, and oak are used.

Harmon wanted to build his own car since was a kid. He began the project as a graduate industrial design student behind his house.

He says the inspiration behind the Splinter was a WWII airplane called the de Havilland Mosquito.  Equipped with two Rolls-Royce V12 engines, it was the fastest piston-driven plane of its era, and was made almost entirely out of wood.

Cherry on Balsa Wood Supercar

The body of the car is made from woven strips of cherry veneer with a balsa core.  Harmon and his team carved a buck by hand from solid redwood blocks and made a set of female molds from it.  These molds were used in conjunction with a vacuum-assisted resin-transfer process to form the wood veneer body panels.

To achieve the compound curvature required by the body design, the team wove strips of veneer into a cloth.  Two looms were designed and built by the team to generate this cloth material. Harmon said this greatly increased the wood’s utility in composite construction.

Cherry on Balsa Wood Supercar

The chassis (structural framework) is made from a series of bent and molded laminates which were secondarily riveted and bonded together.  A custom mold was built for every component of the chassis. These components were formed, fit, trimmed, and bonded together to comprise the overall structure.

The wheel centers are made from rotary-cut oak veneer, covered by a walnut sunburst on the outside face and a cherry sunburst on the inside face.  Each wheel consists of over 275 individual pieces.

Cherry on Balsa Wood Supercar

The Splinter’s engine is a 7.0L small-block V8 and features an 8-throttle-body intake manifold, a custom camshaft, and a custom-built crossflow exhaust system.

Headlights are composed of a molded plywood bucket which houses a pair of light assemblies per side. One light in each bucket is a Xenon HID, while the other light utilizes an amber halogen bulb for running light and turn signal duties.

The taillights are made from walnut dowel rods which house LED strips. The LEDs on the ends switch from red to amber when the turn signals are activated.

The team made custom housing and faces for a set of reverse sweep gauges with simplicity as the goal.

“We wanted to keep the interior as simple as possible, so we only used a tach and speedo for the gauge cluster. Other readings like water temp and oil pressure can be checked on a smart phone or OBD scanner.”

Cherry on Balsa Wood Supercar

“It has a title, but no license plate or inspection sticker. It’s super low to the ground, and it’s very comfortable. You can feel that it has tremendous torque and power,” Harmon says.

Despite achieving a level of quality that few craftsman have, Harmon says he never wants to do something like this again.
“It will always be a one-off. If it were to get damaged or wrecked, that’ll be that.”


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