2011 Rule B8.3.8 |
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Joao
Bolt Sorter Joined: Sep/10/2010 Location: Paracicaba Status: Offline Points: 2 |
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Posted: Sep/10/2010 at 12:18pm |
B8.3.8 Fore/Aft Bracing (FAB)
Members used in the FAB system must no exceed 1016mm (40in.) in unsupported lenght. Triangulation angles (projected to the elevation view) must not exceed 20ยบ. 2010 Rule: 31.2.8 Roll Hoop Bracing (FAB) The roll hoop shall be braced in the front and/or rear. The hoop must be braced on both right and left sides. From a side view, the bracing must be trianguled, with the maximum lenght of any member not to exceed 101.6cm (40 inches) between attachment points. From a side view, the angles of the triangulation must be no less than 20 degrees. A bent tube cannot exceed 81.3cm (32 inches) in total lenght and the bend shall no exceed 30 degrees. is this ok? According to my interpretation these two rules refer to the same angle, one rule restricts a superior limit and the other an inferior. I have the doubt because it looks weird to me that there's such a radical change from last year rules. any help about this? maybe Im misundertood.
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asims
Welding Master Joined: Apr/07/2009 Location: Tucson Status: Offline Points: 184 |
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I contacted bajarules@sae.org and they told me this is a typo. The correct wording should be that angles must be greater than 20*. An official announcement is supposed to come out soon.
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Andrew Sims
University of Arizona |
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wishin4snow
Milling Master Joined: Aug/05/2009 Location: Williamsport PA Status: Offline Points: 52 |
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I was wondering the same thing when I read that part a couple weeks ago. I was looking at our old frame and it was 25 degrees and wondered how we got away with that.
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-Kevin
Pennsylvania College of Technology "Hold 'er dubya" |
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rohanlakhotia46
Milling Master Joined: Sep/09/2010 Location: Vellore, INDIA Status: Offline Points: 49 |
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does this mean that the triangulation angle for the front bracing should be between 20 degrees to 30 degrees?
-rohan |
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Rohan Lakhotia
`The 46 Doctor` TEAM JAABAZ Vellore Institute Of Technology vellore,t.n., INDIA Car #42 (kansas) |
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asims
Welding Master Joined: Apr/07/2009 Location: Tucson Status: Offline Points: 184 |
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There's no explicitly stated upper bound, but based on the other constraints of the frame, you probably wouldn't want to go past 45 degrees or so.
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Andrew Sims
University of Arizona |
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Amrit George
Bolt Sorter Joined: Sep/23/2010 Status: Offline Points: 16 |
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Hi.... my doubt was regarding the triangulation angles for the front bracing members.
is the 20 degree angle the one between the FBM up and the FAB or is it it between the FAB and the vertical?? i have posted a sketch below of the side view ..... |
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Greenreed1936
Bolt Sorter Joined: Aug/31/2009 Location: Rapid City Status: Offline Points: 24 |
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It is the angle between the FBM up and the FAB.
One of ours was designed very close to that, as to the idea of 20.5* Lets just say, we had to let it settle a few times to make sure the go-no-go gauge worked |
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