Hopefully we're talking about the same things here, John. This is for road racing, not Auto-X right? Also I don't have my 2007 GCR with me so I'm going off of the 2006 since I'm out of the state right now. What kind of car is this?
> > As I read it, I need 3/16 plates with minimum 2 inch legs. They need to be > welded to the front and main hoop, but I'm not sure it they are to be > placed > at the point where the hoops meet both the top and bottom frame rail or if > is only where the hoops meet the top rail. > > Also, I'm not sure whether these gussets can be placed ahead and behind > the > main and front hoops respectively or whether they need to be ahead of the > main hoop amd behind the front hoop. Where are you getting 3/16" plate from? The requirements state 14 gauge (0.078") thickness for the gussets not 0.1875" for Formula Car Roll Cage bracing. The hoops themselves do not need to be gusseted if they go all the way to the bellypan. If they do not they need to be gusseted to the member to which they attach. And then you should run something to the lower frame rail. The gussets themselves as referenced before are for the forward braces and their attachment points to the frame/roll hoops. I'm not too sure which question you're asking. > > 1. 1" x 0.080 minimum steel tubing (DOM) > > I'd just use the 1.25 inch bracing that I already have there, so that > won't > be a problem. > Just make sure it's 0.080" wall. > > 3. > 30 deg included angle to the rear roll hoop > > I'm not sure what the "included" part means. I suspect that it has > something > to do with the existing angle of the main hoop. Mine is off vertical by > about 10 degrees canted rearward. So do I ignore this "included" term and > set the brace 30 deg. off vertical? Or do I simply make the brace 30 > degrees > off the main hoop? > As drawn in the 2006 GCR Figure 8 following section 18.7 the angle is the side view angle between the roll hoop and the forward brace. Not the angle off of vertical. And it has to be greater than 30 deg. So per your 10 degrees of rear lean the front brace would have to be a minimum of 40 degrees off of vertical. > > Another possibility I can see involves bending the braces some. Can there > be > more than one bend in the braces? I could do a lot to give myself room by > setting them outward, downward and finally inward toward the front hoop. > The braces that are in there now do have one outward bend. Your thoughts? > > Yet another idea is to set the downward brace at 30 deg. and weld it to > another full length brace that runs from the main hoop to the front hoop. > Your thoughts? Nothing here that hasn't been done already. KBS/Invaders both have slight bends in the forward bracing and another brace that intersects the forward facing brace. We've done the same thing although we've moved things around to make them a bit stiffer and provide more protection. Let me know what kind of car you've got. If it's a KBS we're very familiar with this kind of modification and can help to point in the right direction. Additionally if you're anywhere near SE Michigan you can stop by and take a look at our new chassis for ideas/inspiration. Jay's comment about clarifying these things directly with SCCA tech is a very good idea. They take a while to get a hold of but will answer just about everything. Steve ________________________________ FormulaCar Magazine - A Proud Supporter of Formula 500 The Official Publication of Junior Formula Car Racing Subscribe Today! www.formulacarmag.com or 519-624-2003 _________________________________ _______________________________________________ F500 mailing list - [email protected] To unsubscribe or change options please visit: http://f500.org/mailman/listinfo/f500 *** Please, DO NOT send unsubscribe requests to the mailing list! ***
