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20156/12

Aiming Looooow Pt. 2

Things are moving on – albeit at a glacial pace – with the 3-wheeler project.

Mr. Haruyama, the builder, does most of his work by eye. For us, er, classically trained designers, though, it has been difficult to make a start without knowing the relative size and layout of the frame, engine, transmission and wheels compared to the overall size of the vehicle, i.e. the package. Here are some of the details:

It will be registered as a motorcycle and sidecar, which legally limits the overall size to 2.5 metres long and 1.3 metres wide. There is no height restriction.

The 250cc engine and transmission will be from a Suzuki Skywave big scooter (Burgman outside Japan). Mr. Haruyama has cut away the rear of the Skywave frame, including the swing-arm and suspension mounts, to use as the central subframe of the 3-wheeler.

Skywave400_616

IMG_0943_616

IMG_0941_616

Recently he has torn down his original 3-wheeler to rebuild it again for himself and in the next photo you can see the subframe in situ. He has taken the opportunity to cut off even more of the original frame than the subframe for my vehicle, to save some weight.

IMG_0945_616

The tubes of the frame of the original 3-wheeler are peppered with holes for mounting body panels, which must reduce the strength a lot. I will be asking him to use welded brackets to do the same job wherever possible.

Hole_616

I made a rough schematic of the wheel layout and asked Mr. Haruyama to draw the rest of the layout over it. This is what he gave me.

Haruyama package_616

Um… pretty rough, as you can see. Based on these dimensions, measurements of the Skywave frame and photos of the frame and original 3-wheeler I added more details, including a mannequin roughly the same size as me. The original Haruyama 3-wheeler has front strut suspension, using the axles as lower links and located fore/aft by radius arms. He wants to try wishbone suspension on the new one.

3-wheeler package

So, now this goes open source inside Envision. Let’s see what the designers come up with… and how they match the Haruyama aesthetic.
Any contributions from outside Envision welcome – and credited if they are used! Contact me at info@e-v.jp if you would like to receive bigger JPEGS of the package.

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