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Can Am-continuing the theme of brass and wire


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#1 JimF

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Posted 19 August 2016 - 11:57 AM

As all the previously pictured chassis have been tested, I have gotten the impression that the brass and wire concept has some bennies (along with some inherent weaknesses too) The mix of brass and wire seems to be a bit more damp and thus a little easier to drive in most of the applications so far.

 

The main weakness of course is the potential for the brass to bend from very hard hits. Of course, one could argue that a hit that hard would likely create other (possibly terminal) issues as well. The other possible caveat might be that continued pounding into sharply banked turns could produce a gentle overall bend in the chassis. I have not seen this yet but I am aware of the possibility. Thus, it seems that the brass must usually be supported by at least some wire.

 

Given that theme, I originally planned to build a straight rail car. But, I was admiring a pic of a Tony P tripod and realized that I hadn't built up a tripod in a while, so I did this instead.

  • Two rail brass (real brass btw, not bronze welding rod)
  • Single .055 tripod wire.
  • R-Geo angled face bracket in .050"
  • Warmack guide tongue w/offset.
  • All flat brass is .032"
  • W/B = 4.0" GL = .925"  All up weight 105 gr.

Testing to come..............

 

DSC02526.JPG

 

DSC02525.JPG


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#2 Tom Eatherly

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Posted 19 August 2016 - 12:21 PM

Seems it would work on a King. Hmm. I'll be watching the testing. Very nice work Jim.


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#3 JimF

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Posted 19 August 2016 - 01:50 PM

The last batch of builds and tests had a very specific target in mind while this one is intended to be more general purpose. Thus, the criteria that I use to judge it won't be as narrow or as critical. In this configuration, I think it'll go well on all of our speedway tracks and with some weight on the pans (or inboard FTM....) I think it'll be good on a flatster as well.

 

This will get tested starting tomorrow on our fastest King (4.8 sec) and so I'll get a good start there.

 

For the specific application of a (4 sec.) King track.......I'd make it shorter, lighter, and probably make the tripod rails out of .062 rather than the .055 used here.


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#4 Tom Eatherly

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Posted 19 August 2016 - 02:09 PM

Jim,

What would the WB be on one for BPR's King? And the one pictured.


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#5 JimF

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Posted 19 August 2016 - 02:40 PM

The one pictured is 4". One for BPR would be 3 7/8" or maybe even less. Also a shorter guide lead and lighter pans.


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#6 Dallas Jackson

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Posted 19 August 2016 - 04:15 PM

Very nice chassis..  wow.!


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