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Roll Bar

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baremetl(at)gvtc.com
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Posted: Fri Feb 22, 2008 10:32 pm Post subject: Roll Bar

Does anyone have any info on how modify the  original Van's roll bar on an rv-4 to the style that has a rounded top. I have  seen these on a few -4's and HRII's over the years and wish to make one for an  F-1 rocket with a tip over canopy. Perhaps someone knows of a  supplier?

  

 Thanks.

  

 Ivan Haecker    -4     1437 hrs.  S. Cen. Tx

   [quote][b]

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sonex32(at)earthlink.net
Guest

Posted: Sat Feb 23, 2008 8:36 am Post subject: Roll Bar

Ivan,

  

 I made one from scratch using a U tube and two  straight pieces of tubing. Draw what you want full size and it will be easy to  cut the U tube in the right place. You'll have to Google the U tube, as I no  longer have the URL.

  

 http://picasaweb.google.com/tonyboytoo/RV3BFuselage/photo#5136844894985929762

  

 Tony

  

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sonex32(at)earthlink.net
Guest

Posted: Sat Feb 23, 2008 9:33 am Post subject: Roll Bar

Ivan,

  

 Here's the link for the U tube: http://www.magnumforce.com/ubend.asp

  

 And here's another stab at the roll bar photos: http://picasaweb.google.com/tonyboytoo/RV3BFuselage

  

 Tony

  

 [quote]   ---

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baremetl(at)gvtc.com
Guest

Posted: Sun Feb 24, 2008 9:30 pm Post subject: Roll Bar

Thanks to both of you for your responses. One other  question: When attaching the curved top piece to the two straight side bars, is  a short piece of tubing inserted before joining the pieces to strengthen what  would otherwise be a weaker butt joint?

  

 Ivan Haecker    -4     1439 hrs.    So. Cen. Tx

 [quote]   ---

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sonex32(at)earthlink.net
Guest

Posted: Mon Feb 25, 2008 4:14 am Post subject: Roll Bar

Ivan,

  

 With a proper weld I don't think the joint will be  any weaker than the base metal. On mine, the U bend is mild steel and the  straight legs and braces are 4130. After all the pieces fit properly, I safety  wired the assembly to a plywood board for tack welding.

  

 Tony

 [quote]   ---

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