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Splitters and accouterments

Old 01-08-2019, 01:58 PM
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If I am reading your plans correctly, the step between the two plates will be 1/2". I don't think that's enough to matter on a structure as aerodynamically "dirty" as a Miata underbody. On an Indycar or NASCAR, both very finely tuned aerodynamic shapes, yes.
I think 1/2" is overkill for the two plates. That's 1" on birch. If clamped together over a wide enough area, they effectively become one. That's a lot of mass. I'd consider doing both plates of 3/8" and making the lip section a bit less area. Just to save mass. When it's all bolted together and on the car, it should still support your weight when it's extended around 4" from the dam.


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Old 01-08-2019, 02:58 PM
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Thanks for your advice. I will do my best to minimize the mass. I went with 1/2" for two reasons.
1. I only wanted to buy one sheet of plywood.
2. I was worried that after countersinking the grooves in the splitter with 3/8", there would only be about 1/8" of material clamped under the washers. That seemed like a bit thin. 1/2" gives me more like 1/4" of material.
Another option would be to use 3/8 on both panels, but not countersink the grooves. The bolt heads would protrude but not by much.
Or, if you think 1/8" of material at attachment points (using 2 layers of 3/8") + cables out front would still suffice, I will try that.

Thanks again.
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Old 01-08-2019, 03:15 PM
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I would think dome head bolts and the thinner lighter ply would be better,IMO anyway.

Thanks for the post, it reminds me to make a better version of our basic splitter as well. Same reason, adjustability/fine tuning but mostly for getting on and off the trailer as well
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Old 01-08-2019, 03:22 PM
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