312B2 Rear Wheel Construction Resized.jpg
312B2 Front Wheel Construction Resized 1.jpg
312B2 Front Wheel Construction Resized 2.jpg
312B2 Wheel NSF Resized.jpg
312B2 Wheel OSR Resized.jpg
I hope that the accompanying images show how I tackled the problem to make some wheels to convert the Protar 312B2 which is of the 1971 version of the car to the 1972 version. The spokes on the 312B are thinner toward the centre than on the 321B2 but I haven’t got around to modifying these yet. As an aside the images also include parts of an enlarged scale drawing, this drawing shows the wrong spoke design for the wheels.
Just so we are all on the same page with the terminology for the various parts of a wheel I am using this as link as a guide:
https://www.theengineerspost.com/wp-con ... heel-1.jpg
The Rear Wheels
• After some careful measuring the rims and flanges from the Tamiya Lotus 72D were cut at the drop centre (with the spokes attached) of the rear wheel,
• You will need to make some form of jig to ensure that that the line of the cut and the cut in the wheel itself are perpendicular to the centre line of the wheel,
• The process is repeated to the Tamiya 312B wheels but this time it is the drop centre with the spokes attached that are needed, you must be careful that the cut you make doesn’t damage the wheel spokes,
• The inside if the drop centres on the Tamiya 72D and the 312B are the same so it just a matter of gluing these together then filling and sanding any sign of the join.
The Front Wheels
These are not so easy to modify but it is straight forward.
• Follow the same procedure as described for the rear wheels, but you will need to add a disc of plastic card to the 312B drop centre as the 312B and 72D drop centres and rims are not the same diameter.
I hope that the above makes sense.
Hacksaw
312B2 Wheel OSR Resized.jpg
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