i haven't read anywhere or seen anything online stating what angle tolerances are required for the main hoop of a roll bar/cage. Does the main hoop have to be at exactly a 90degree angle w/ the floorboards or can i lean it back a little? How much of a back angle (like 75degrees?) is the main hoop allowed to be tilted?
Reason being is that this is for my del sol and i want the top of the main hoop to be as far back as possible, so it doesn't obstruct my head, but also has to allow the rear braces to be at 30+degrees w/ the floorboards.

TIA.
-ROB

 

You'll want to get very familiar with the rule book for whatever series you are planning on running. There are probably detail differences in this regard.

K

 

No, you can get by with a little lean back, check with the rules of your oganization first. Make sure the main hoop is properly braced and has a solid foundation. Remember, triangles are stronger than rectangles.

 

roll bar/cage/harness bar was designed by myself and all the chromoly is cut and notched. It meets SCCA & NASA standards, and I believe NHRA as well. It just needs to be welded together.

All i want to know is what type of tolerances NASA and/or SCCA allow in regards to the main hoop's mounting.

I have read NASA and SCCA's rules in detail while designing the system, but didn't find anything referencing main hoop angle.

 

roll bar/cage/harness bar was designed by myself and is totally finished, meeting SCCA & NASA standards. I believe NHRA as well. It just needs to be welded together. All i want to know is what type of tolerances NASA and/or SCCA allow in regards to the main hoop's mounting.

 

https://honda-tech.com/zero...94945

 

thanks...i'm sure he'll get at this post sooner or later. he always does get to the technical NASA-specific questions....

 

You are correct. There is no reference to this angle. What angle do you plan to install it at???

 

the angle between the main hoop's plane and the floorboard is probably going to be between 80 and 90degrees- just a slight leanback. will it break any rules that way?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sol2nr &raquo;</TD></TR><TR><TD CLASS="quote">the angle between the main hoop's plane and the floorboard is probably going to be between 80 and 90degrees- just a slight leanback. will it break any rules that way?</TD></TR></TABLE>

No.

Be sure you follow the NASA CCR rules for the rear uprights supporting the main hoop.

Take FULL advantage of the mounting plates under the main hoop.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Grumpy &raquo;</TD></TR><TR><TD CLASS="quote">
Be sure you follow the NASA CCR rules for the rear uprights supporting the main hoop.

Take FULL advantage of the mounting plates under the main hoop.</TD></TR></TABLE>

The rear braces meet nasa & scca standards.

what does "full advantage" mean?---- make them the biggest dimensions allowed?

 

...and wrap them over surfaces running on different planes. Make them bent and welded to the floor and inside rocker rather than just flat on the floor.

K

 

Exactly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Knestis &raquo;</TD></TR><TR><TD CLASS="quote">...and wrap them over surfaces running on different planes. Make them bent and welded to the floor and inside rocker rather than just flat on the floor.

K</TD></TR></TABLE>

thats a good heads up. thanks.