Is HardDog with double diagonals legal for NASA TT ?

 

Yes. You don't even need a roll bar at all for NASA TT (some tracks require it, but not for the sanctioning body).

 

CKit, Thanks for the quick reply.

The reason I'm asking is because I don't have the factory hoops and I remember reading somewhere that only the single diagonal is legal

 

Hmm. Gotcha.

http://www.nasaproracing.com/rules/ccr.pdf
11.4.7 Roll Bars
All open cars should have a roll bar installed to help protect the occupant(s) from injury during a roll-over. The main hoop shall be one continuous piece with smooth Mandrel bends with no evidence of crimping or wall failure. All welds should be of the highest possible quality, with full penetration [Ref15.6.15)]. All cars with roll bars are required to have adequate roll bar padding per CCR section #15.6.4. In cases where the driver’s head may come in contact with the roll bar should the seatback fail, a seatback brace is required in conformance with section #15.6.21. Acceptable roll bars include, but are not limited to, the following:
Hard Dog
AC - Ace
D - Deuce (center-braced model only) AB - M1 Hard Core
TB – M1 Hard Core Hardtop
9B – M2 Hard Core
NB – M2 Hard Core

Farther down in the roll cage section they talk about the single diagonal, but I think those are just cage requirements and not bar requirements?



 

They talk about the M2 being legal:

http://www.bethania-garage.com/m2_hardcore.htm

And that bar is available with a double diagonal (NASA didn't exclude it).

Seems like it'd be okay, but I can't confirm.

 

Here's a guy with a Miata talking about TT. He has the double diagonal.

http://www.nolamotor.com/forum/archi...hp/t-1142.html

I also don't see how they would disallow a double diagonal Hard Dog but allow the two separate OEM roll hoops.

Still wondering if the double diagonal restriction was on cages only.

 

Chicago, huh? From my experience, you won't have any issues regionally with a double diagonal bar. No problems at nationals either, but your results may vary. Planning on running with NASA Midwest this year? What class?