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Splitters and accouterments

 
Old 01-08-2019, 12:58 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, 01:58 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, 02:15 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, 02:22 PM
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Thanks.
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Old 02-27-2019, 02:21 AM
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This image was released today of the new Supercar DJR Penske Mustang at Adelaide. I thought the raised edge of the splitter was interesting, not to mention the intake, rad/cooling and size of the brake ducts.

The splitter leading edge has me intrigued though. Any thoughts...?




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Old 02-28-2019, 04:33 PM
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Just finished this splitter design with the help of a friend. Its 1/2 birch and runs under the oil pan. However, I want to try something new so I purchased 2 sheets of 6mm Alupoly. I will report back how it holds up.


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Old 02-28-2019, 09:12 PM
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Originally Posted by sexyicky View Post
Just finished this splitter design with the help of a friend. Its 1/2 birch and runs under the oil pan. However, I want to try something new so I purchased 2 sheets of 6mm Alupoly. I will report back how it holds up.
It looks like that Alupoly is just as heavy as 1/2" birch and isn't nearly as tough. Alumalite is what you want if you're looking for lighter.
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Old 02-28-2019, 09:23 PM
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Originally Posted by zellers88 View Post
It looks like that Alupoly is just as heavy as 1/2" birch and isn't nearly as tough. Alumalite is what you want if you're looking for lighter.
I will make sure to post the weight differences once I complete the splitter.
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Old 03-01-2019, 01:05 AM
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Originally Posted by mx5-kiwi View Post
This image was released today of the new Supercar DJR Penske Mustang at Adelaide. I thought the raised edge of the splitter was interesting, not to mention the intake, rad/cooling and size of the brake ducts.

The splitter leading edge has me intrigued though. Any thoughts...?
Reducing spill-over (and thus pressure loss) of the high pressure on the splitter by a fractional amount.
Those brake ducts are indeed massive.
I'd be interested to see what the ducting behind the grille looks like.



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Old 03-01-2019, 10:17 AM
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Originally Posted by sexyicky View Post
I will make sure to post the weight differences once I complete the splitter.
Density and other data for Alupoly
https://www.piedmontplastics.com/blo...upoly-overview
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Old 03-06-2019, 02:44 AM
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So my 1/2 inch birch splitter comes in at 12.5 lbs vs the 1/4 inch Alupoly at 15.2 lbs. The Alupoly has some flex but it's usable and passes the body weight test.




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Old 03-06-2019, 08:35 AM
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Your using the wrong material if a quarter inch is heavier then a half inch of ply.
10mm alumalite is lighter and stiffer then ply.
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Old 03-06-2019, 09:02 AM
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Originally Posted by Wingman703 View Post
Your using the wrong material if a quarter inch is heavier then a half inch of ply.
10mm alumalite is lighter and stiffer then ply.
I agree the material and weight is not ideal. However I bought 2 sheets so I will use it for now. If all else fails I'll return to my birch splitter. The s2000 community has been using this for sometime so I have a little hope.

Thanks for the input
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