Learning how to build Lotus Seven replicas...together!
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 Post subject: Re: Caterham curve
PostPosted: May 18, 2018, 10:56 am 
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Joined: October 24, 2008, 2:13 pm
Posts: 3795
Location: Carlsbad, California, USA
There is another "Caterham curve" too. The rears on Caterhams kick up at the bottom much more than a Locost. Also, there is a subtle downward curve as the top of the chassis goes from the cockpit to the rear panel.

Here's an example of a Caterham that shows both.
File comment: Caterham illustrating kick-up & top curve at boot.
Detail-420R-Rear-3Qtr.jpg [ 57.63 KiB | Viewed 266 times ]

This French one-off takes both to the extreme. I think it works and looks very "aggressive" if I can employ that over-used word.
File comment: French 7-like car where both curves are exaggerated even more.
Detail-Low-Slung-Locost-2.jpg [ 137.27 KiB | Viewed 266 times ]

When I did my own Locost (based on the Haynes Roadster) I hadn't really noticed the upper curve on Caterhams yet, but did like the kick-up on Graham Earley's roadster that he built using a New Zealand company's 7-like chassis. It still uses the essentially flat top rail.
File comment: New Zealand based, USA 7 build by Graham Earley.
Graham Earley 2.jpg
Graham Earley 2.jpg [ 69.16 KiB | Viewed 266 times ]

Initially, I just designed in the 25° kick-up from Graham's 7. But after looking at several examples, I now prefer having both curves and will change my design on the build table when I get back on it soon. I believe these smaller details provide a lot of personality to a Locost and are worth thinking about when deciding how to build your own.


Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886

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