Sunday, August 17, 2008

Rudy Kurth and the 1976 Cat III


This 1970s CAT III has got to be one of the most amazing trikes ever made...

Pics: Jalopnik

We found this rather radical looking machine on the pages of Jalopnik. Built by Swiss engineer Rudy Kurth, back in 1976, the Cat III is essentially a sidecar rig fitted with a custom-built 500cc three-cylinder engine.

Weighing in at around 139kg, the CAT III is built around an extruded aluminum spine, which also serves as the fuel tank. The 500cc three-cylinder engine is quite complex – it’s based on two 350cc Honda twin-cylinder engines. Mr Kurth, probably a talented engineer, used three of the four Honda cylinders to make his own 500cc triple.


Should be an amazing ride, eh...?

The other notable thing about the CAT is that both the front and the side wheels are steered, with the latter turning in proportion to the tracking effect. (Er… no, even we don’t know what that means, but it probably, somehow, adds to the vehicle’s stability and handling prowess.) The CAT III is fitted with tyres designed for the Tyrell P34 six-wheeled Formula One car.

Unfortunately enough, we’re unable to find more details on this very interesting machine. Perhaps one of our readers can help? If you have any more information on the CAT III, please post the same in the comments section below. Thank you!

Also see:
Harley-powered trike: The Cirbin V13R
The very, very cool Carver One...
Tiff Needell tests the amazing Campagna T-Rex!
The Peraves MonoTracer: 100 units in 2009...
Riding the Travertson V-Rex...
The 750bhp, 600km/h Acabion GTBO 70...
Memorable: The Bimota YB11...

External links:
MAG: Matúš Procháczka's trike concept...

4 comments:

DribbleMonkey said...

What it means by "in proportion to the tracking effect" is that the outside wheel turns slightly less but directly proportional to the two main wheels. This is due to the fact that it is traveling along a different (wider on right hand turns and tighter on left hand turns) parabola than the main wheels.

Dr Hand said...

I'd be more inclined to label this as a side-car outfit, than a trike.

Anonymous said...

This was indeed a bit of a miracle-machine. If I remember well it was the first "sidecar-combination" in which the passenger did not have to do anything else than hold-on an lay-down. Just put in a bag of sand was not alowed. Engine was basically a Yamaha TZ 350 with 1 added cylinder.

God said...

There seems to be some disagreement in what engine was used... Hemmings states: "The engine was a three-cylinder Crescent maritime unit."

http://blog.hemmings.com/index.php/2008/08/20/its-a-motorcycle-its-a-motorcycle-its-a/

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