1969 Camaro RS.R - a new project from the OLC Team

[fleetus macmullitz]

Originally Posted by DFRESH

How dare you say that.

Sorry Doug, of course yours is special too...

[Jay Hilliard]

Looking great. Nice job.

[SLO_Z28]

How much rear camber are you running with that floater? What posi are you using?

[Rybar]

James and Rodger, the project is looking great. Love those ideas with the cage.

[sik68]

Originally Posted by ironworks

Absolutely love this build!

I have a question on the fabricated base for the main hoop. The load path seems a little suspect, as the main hoop loads during a crash have to get transfered through the relatively thin sheet of the fabricated box. Do you think that box is strong enough to not puncture or deform during a crash?

Thanks,
S

[HWY Nova]

Originally Posted by sik68

Absolutely love this build!

I have a question on the fabricated base for the main hoop. The load path seems a little suspect, as the main hoop loads during a crash have to get transfered through the relatively thin sheet of the fabricated box. Do you think that box is strong enough to not puncture or deform during a crash?

Thanks,
S

What thickness do you consider to be thin? The boxes are probably 1/8" thick.

--Eric

[James OLC]

Built to the rules and to the prefered design:

15.6.13 Mounting Points
The roll cage shall be mounted to the floor area of the car in six, seven, or eight points. The cage shall not go through the firewall. The seventh and eighth points must attach to the firewall or front fender wells. All cage attachment points must be mounted to plates or a mounting box (plinth). Each required cage bar shall terminate on a plate with a 360 degree weld to the mounting plate, except as specified in Section 15.6.14.B. There shall be only one (1) mounting “point” per plate. This point is defined as where the “required tube” mounts. All additional tubes mounted to that plate must be mounted as close to the required tube as possible [Ref: (15.6.14.B)]. It is recommended that plinth boxes use a bottom support plate in cases where the edges of the box may punch through the sheet metal.

15.6.14 Mounting Plates
Each mounting plate shall be no greater than one hundred (100) square inches and no greater than twelve (12) inches or less than two (2) inches on a side. Welded mounting plates shall be at least 0.080-inch thick. Plates may extend onto vertical sections of the structure. Any mounting plate may be multi-angled, but shall not exceed one hundred (100) square inches total including vertical sections. Each mounting plate should have an area of not less than nine (9) square inches.

and yes - I would consider them to be on par with the subframe or subframe connectors wrt strength.

[ironworks]

So your saying I was not supposed to form them from .020 aluminum? But I painted them with steel colored spray paint. Krylon none the less.......GEEZ

[sik68]

Good to know thanks guys

[SLO_Z28]

The point he is making is that you have only about 1.25 sq inches (assuming its .125 x 6(4x2 patch) as opposed to the surface area of part where the main hoop connects which would be 8 sq inches. You load the main hoop and it would act like a lever arm on the frame and deform. To reduce that you could add another plate underneath where the bend comes down from the hoop and that would slow deformation of the mounting plate.

If you got me some measurements from that picture I could do a few statics calculations and give you a basic idea of how forces would act on it in a collision.