Lotus 79 construction report – part 6

Suspension progress

Another update on the manufacturing of the Lotus 79 (built in 2010).

With the upcoming of the ground effect, Lotus was forced to develop a new suspension layout which cooperates with the airflow through the side pods. So, Lotus changed the position of the spring damper unit and transfer them to the inside near the gearbox. The system with the inboard brakes dissapeared after the type 79. The idea behind that was to minimize the non suspended mass and therefore the wheel load transfer. At suggestion of Mario Andretti, Lotus placed driver adjustable anti roll bars in front and rear. The adjustment was given by a rotatable blade to  change axial moment of inertia.


A  plan view on the right rear suspension. Massive rocker arms at the top activate the inboard lying spring/damper unit. Track is led by a simple screw adjustable track rod. The lower wishbone had a cylindrical cross-section at the start of the season and from somewhere mid season on a drop shaped cross section.  Drive shaft has two Lotus made CV joints. At the inner end of the rocker arm, you can see the attachment of the adjustable blade of the arb.


Rear end view. You can see a few lines of the oil system. There is a filter and a pump inside the very rear part of the gearbox. At the top, you can see the rain light. The arb is mounted on the same frame as the rocker arms.
You can see the adjustment of the blade by the red cable and a lever.


In the middle of the gearbox, you can see a heat shield to protect the gearbox housing. What applies to the suspension, applies also to the exhaust system. At the former cars, the exhaust system was as short as possible. Here you can see a worm, leading away from the side pods to create space for the ground effect.


Rear view.  Btw, track rear is 1625mm


Current state.


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About paulsf1

My name is Paul Bischof. I’m a student in mechanical engineering at the Technical University of Graz in Austria, expected finishing in February 2016. Since I was eight years old, I am building model planes out of paperboard. Since 2004 I scratch (that means building without an assembling set) Formula 1 and sportscars in 1:10th scale. The average time I need for such a car is around 400 to 700 hours within 4 to 8 months. One car has around 3500 up to 5000 single components. On this blog, you can take a look on my work and later, after my studies, hopefully you can see me in Formula 1.

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