Chassis CAE was completed to assess torsional rigidity and low speed front end impact. This was done by the local arm of a global CAE company Tecosim. As per the original our chassis has 5 different diameters of tube, and approximately 217 tubes in total. This total varies dependent due to the number of outriggers that each chassis had, as they all vary slightly.

The major departure from the original is our chassis is T45 aeronautical steel. But my partner is considering building his chassis in aluminium. To do this we would maintain the outer diameters, so we don't have to revise the jig supports, but we would increase the wall stocks to improve the torsional rigidity.

The CAE for my chassis in steel was 32,500Nm/deg (see attached image) and in aluminium it would be around 11,000Nm/deg as per the original 917's. But we could improve this as I mentioned above by increasing the wall stocks. As a comparison an original Ford GT40 MkI monocoque was 17,000 Nm/deg, and the Ford GT 27,100 Nm/deg.

We do intend to build an aluminium chassis car, as then we would really replicate how the originals handled. But due to the feet being forward of the front axle, I don't think we would be running this at the Ring! You can download the full CAE report on the CAE Report tab below.

Torsional Rigidity and Front End CAE

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  • 002-chassis-CAE
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  • 004-Latest chassis 1
  • 005-Latest chassis 2

  • 006-Latest chassis 3

917 Sub Sections

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From the Galleries

  • 150923-body on chassis 1
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  • Rolling chassis 3

  • Rolling chassis with me for website
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  • Rolling chassis 2