Roll cage height?

[w650gb500]

Good afternoon everyone. I’m fabricating an SCCA legal roll cage for a customers Series 3 Caterham. I’ve done several before(Locost, Westfield and Rotus) but I’m wondering if anyone can take a measurement or 2 for me? First and foremost is building a safe cage, but there is a certain aesthetic that I would like to have as well. I don’t want it to look out of proportion when completed. This wouldn’t normally be a problem, but the car is stripped, no scuttle, hood, nose or windshield to draw any reference from. 
 

I have the main roll hoop at 18.5” above the chassis. The owner sat in the car and I measured the top of his helmet at 14.5” in the stock seat. Taking into account a “worst cast scenario” if the car/driver get upside down, I want to allow for the “stretch in the belts” and deformation of the shoulders/body when inverted. 
 

Can anyone measure the height of their main roll hoop for me?

 

Thank-you,

 

   Dan

Edited June 13, 2022 by w650gb500

[Kitcat]

15 minutes ago, w650gb500 said:

Good afternoon everyone. I’m fabricating an SCCA legal roll cage for a customers Series 3 Caterham. I’ve done several before(Locost, Westfield and Rotus) but I’m wondering if anyone can take a measurement or 2 for me? First and foremost is building a safe cage, but there is a certain aesthetic that I would like to have as well. I don’t want it to look out of proportion when completed. This wouldn’t normally be a problem, but the car is stripped, no scuttle, hood, nose or windshield to draw any reference from. 
 

I have the main roll hoop at 18.5” above the chassis. The owner sat in the car and I measured the top of his helmet at 14.5” in the stock seat. Taking into account a “worst cast scenario” if the car/driver get upside down, I want to allow for the “stretch in the belts” and deformation of the shoulders/body when inverted. 
 

Can anyone measure the height of their main roll hoop for me?

 

Thank-you,

 

   Dan

My custom cage is 17&1/2” above the top of the rear bulkhead (top of the “boot”), 40” above the floor. The driver’s side protrudes 7” from the side frame(supplying crumple zone not provided by the stock Caterham cage), 3” on the passenger side. Aesthetically, it comes in a distant 2nd to the Caterham cage but seems to offer greater protection. I’d guesstimate its 125-150 lbs.

 

The seat height must be factored in. My current Caterham seat puts my butt 2” lower than the FIA compliant racing seat it replaced a few months ago.

 

 I will try to attach some photos of my cage.