Unfortunately they have removed their realistically priced Locost chassis plans from sale due to the high cost of public liability and professional indemnity. It seems that 3 years ago Vodou freely published as set of plans, for a Miata based build, however it looks like they are not around anymore. There are plans circulating around for several different sized frames. This can be confusing. “Book” frame refers to the frame in Ron Champion’s.

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Ever since doing a design exercise involving a truss-frame aircraft fuselage, Loccost have a deep interest in frame structures. I’m especially fascinated with three-dimensional truss structures for car chassis design, which so far I haven’t found a real example of. Most car chassis are ‘space frames’ which are usually two truss sides connected with a collection of of transverse tubes.

If they are designed badly, they will have a low torsional stiffness, which will make for less than desirable road holding.

Scratchbuilt 1/10 scale Locost chassis

As an example, a Lotus Seven has a torsional stiffness of around 1, Nm per degree. For modern high-performance cars, 30, Nm per degree is the target. My own car reportedly achieves 22, To get a taste of classic tubular chassis design, I decided to build a Locost chassis in plastic, using the Ron Champion book.

I found out later that I had made a substantial error during the painting phase. The book tells you to build the floor panel and the rearmost side panel from 1. The remainder is to be built from 1.

Scratchbuilt 1/10 scale Locost chassis

Therefore I should not have painted the chassis steel colour overall. Considering the daunting masking job inside the cabin to correct this, I will most likely leave the model this way. Another plahs involves the floor panel. I cut away the paneling below the prop shaft, whereas the book doesn’t. Not an error but more an improvement: I later enlarged the holes in all brackets, to make them look more realistic. Jim McSorley Sevenesque site with drawings of various versions. Chassis rigidity – Plqns25 pages.


Martin Aveyard balsa frame for a car of his own design, and the finished balsa frame. Jay Dagless 8th scale Porsche with a full frame. Tube chassis discussion on the MCM forum. Ron Champion published his locoat in I bought the edition, which is slightly revised. It explains most but not all of the process, but nevertheless it’s very inspiring.

Getting a homebuilt car registered in the Netherlands is very difficult, so I never intended to build one full scale. Instead I decided to build the chassis in 1 to locoat scale. The scale was chosen for convenience: It didn’t have to fit in any collection of a fixed scale, so that was another excuse for this non-standard scale. I bought four locoet of 2. Using the drawings and instructions in Ron Champion’s book, I went to work.

I built the lower side of the frame on the drawing of page 47, scanned, scaled to 1 to 10, and then printed. Generally I managed to build the chassis within 0. CA glue was used throughout, allowing for fast bonding. I used various improvised tools to jig the parts, like Lego blocks, steel blocks and plastic card. I used a JLC saw to cut some connections, and realign some tubes to square the chassis. I followed the book’s building sequence to the letter, and at this point of construction I ran into problems.

It seems the dimensions of the rear section are not correct. Turns out that that the drawings and photos do not agree, and leave locosst in the dark what is correct.

I ignored the problems on the rear side, and continued with the transmission tunnel, built from 2. The keen observer will spot that the tunnel is not symmetrical at locosf front and rear, since it was specifically designed to accomodate the Ford Escort Mark 2 drive train.

Concluding the construction of the space frame were six diagonals in the sides. Build time so far was in the order of 12 hours. Next were the skins, and I started with those at the bottom of the passenger compartment. I used Tamiya’s Ultra Thin glue to bond 0. I wanted to preserve some of the floppiness of the sheet metal, hence this thin gauge.


It definitely has the right effect, but it’s also very vulnerable, and I had to install repair patches in a few locations after breaking the skins. Next the ‘sheet metal’ of the transmission tunnel, the rear uprights, the footwell front, the sides of the car, the top of the footwell, and the nose bottom panel were added, in that order.

The last part of skinning that I added was the rear bulkhead, despite the rear end still being unfinished. For readers with Ron Champion’s book: An evening of work finished the chassis. I estimate that I spent some 20 hours on lockst. As you can see, I had started base-coating the model too, using Humbrolin search of building defects.

After having some doubts, I decided to add the suspension attachment brackets.

I used 5 x 5 mm square tube, with one wall cut away. Making 17 of them was a tedious job, no fun at all. And I found out that the instructions for the longitudinal position of the front suspension brackets is completely missing in the book, which must play havoc with the castor angles of the real thing – unbelievable! I liked the chassis in bare white plastic, but I thought it would look even better in Humbrol’s Polished Steel.

I used an old tin that had thickened and needed thinning, and a fresh tin that was really thin.

Building a Sevenesque Roadster – plans

And they behaved very different, the latter drying very, very fast at summer temperatures. Even cleaning the airbrush was almost too long a delay! Therefore the buffing did not go easy, and especially on the delicate 0. Also, I shouldn’t have base-coated the model in grey paint, since its roughness showed, especially inside the passenger compartment, where the overspray settled down as dust particles.

On the other hand, the buffed paint looked really nice, blotchy in appearance with shiny edges, just like steel before it rusts.