By Steve & Tamami Laser, with Nahoko Osuka reporting from Japan
While Toyota remains on the cutting-edge of mobility with vehicles like the new Mirai and Prius Prime, its engineers and designers dream about creating something a little more basic – a car that could last a lifetime and be treasured like a family heirloom. Setsuna, Toyota’s latest concept, is a two-seat roadster “time machine” finely crafted primarily in wood.
Set to debut at Milan Design Week (Salone del Mobile, Milano) in Italy, scheduled for April 12 to 17, the prototype was conceived to “embody the affection owners grow to feel for their cars, and to show how cars continue to change and offer new value as they are taken care of with love over time.” This should segue nicely in Milan where furniture manufacturers and fashion brands hold events during Design Week to highlight the uniqueness of their products.
Toyota selected a variety of distinctive types of wood for different parts of the car, including the exterior panels, frame, floor, and seats. The automaker says that wood can last for many generations if properly taken care of and it also changes in coloration and texture in response to its environment (particularly temperature and humidity) and conditions of use, taking on a unique character and depth.
Kenji Tsuji, the engineer responsible for Setsuna’s development, said, “When we created Setsuna, we envisaged a family pouring its love into it over generations so that the car gains an irreplaceable value.”
In its development of a car that makes such great use of wood, the Toyota team consulted many experts, including carpenters who specialize in building shrines and temples, and shipwrights.
“Sumitomo Forestry, a company that fully understands our concept, shared their knowledge of wood construction with us, and together we engaged in various types of joint development from the early stages, including wood selection and proposals for processing techniques and assembly methods,” said Tsuji.
“While we used wood as the main material, we also poured lots of time and passion into the car itself with our colleagues, creating a prototype and evaluating it so that the car would offer basic performance in the form of driving feel and comfort. By displaying Setsuna, which was created with these hopes in mind, and receiving a wide range of opinions, we believe that we can further improve this concept.”
Let’s take a closer look at Setsuna and discover the remarkable beauty and craftsmanship of this petite roadster.
Every new car has a clock in the dashboard. The timepiece in the Toyota Setsuna doesn’t only mark the minutes and hours, it also counts the passing years. It will mark up to a century to record its years of constant service to successive generations and its evolving role as a valued member of the family in its own right.
Setsuna’s circular, radial emblem captures the idea of “the accumulation of moments.” It represents both a clock face and the blooming of a flower, reflecting the designers’ wish for a growing relationship between car and family.
Wood was chosen as the primary material for Setsuna’s construction, to express the idea that “love grows as time passes.” Wood changes in color and feel in direct response to the love and care shown to it. As Setsuna is passed from generation to generation, the physical changes in its wooden bodywork reflect the bond it has built with its owners and their shared experiences.
Setsuna is not a piece of furniture; it is a fully functioning car, although not road-legal. For this reason, different types of wood were chosen for specific parts of the vehicle: Japanese cedar, with its vivid grain and flexibility for the exterior panels; strong and rigid Japanese birch for the frame; hard-wearing Japanese zelkova, and smooth-textured castor aralia for the seats. The panels feature different grain patterns in the cedar, achieved with straight and cross-cutting of the raw timber, creating attractive contrasts.
Okuriari and Kusabi – Japanese Joinery Techniques
Sections of Setsuna have been crafted using traditional Japanese joinery techniques such as okuriari and kusabi. The former allows the panels to be fitted without using nails, so they can be easily removed. It makes for stronger joints and allows minor changes to be made to the mortise and dovetail joints if they become worn over time. The joints in the car’s frame feature split tenons fastened to through-tenons that pass through several component parts in the frame to give a secure hold.
Setsuna’s body is made up of 86 handmade panels, each of which will change in appearance as the car ages. When repairs are needed, individual panels can be removed and replaced, without the whole bodywork having to be taken off. Repaired panels will bear the marks of the craftsmen who worked on them, adding to the individual character of each car.
Lacquer finishing is applied by hand to bring out the beauty of the wood grain. Wipe-lacquering is applied to the door mirrors, seats, steering wheel and the banding lines on the bodywork, a technique that involves repeatedly applying the lacquer to the surface and wiping to set it along the grain of the wood to create a combined texture. Color and intensity will change with use over time to give the vehicle a different appearance at different moments in its lifecycle.
The seats have been designed to be comfortable and inviting to anyone, in the same fashion as a park bench. The castor aralia timber has been lacquered and the parts which come into most contact with the body are covered with leather.
Curving Body Lines
Setsuna’s wooden elements will slowly bend over time, giving the body a pronounced, beautiful curve, rather like a boat. The front presents a heptagonal shape while, viewed from the side or above, the car’s form is elliptical.
The electric motor-powered Setsuna measures 3,030mm long and 1,480mm wide. A two-seater, it stands 970mm tall and has a 970mm wheelbase. It will be on public view at 31 Via Tortona in Milan from April 12 to 17.
The Setsuna concept defies the notion that cars should only be seen as industrial products loaded with the latest technologies. (video: Toyota)
News source, photos and video from Toyota Motor Corp., Toyota Europe, and Toyota UK
Story © 2016 CarNichiWa.com