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01-08-2024, 09:52 AM | #1 |
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can someone explain to me why spoiler reinforcement plates work?
I'm looking at this piece from Burkhart: https://burkhart-engineering.com/sho...-fuer-gts-gt4/
...and I don't get the idea here. If you're trying to spread the downforce load over a larger area, how are plates that sit *underneath* the trunk lid going to help? What am I missing?
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01-08-2024, 11:55 AM | #2 | |
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you can do the same thing with just a 16gauge alu cut to size.
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01-08-2024, 12:32 PM | #3 | |
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if it sat between the spoiler support and the trunk, that would make sense -- you're spreading the load over a wider area than the foot of the spoiler and therefore decreasing the PSI. but in the under-the-trunk arrangement, i don't see what you're gaining?
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01-08-2024, 03:03 PM | #4 | |
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Lay the tip of the pen on the paper and push down slowly to observe how the weight is now causing the paper to be pushed down. You'll notice that it doesn't push down in just one singular spot. it typically starts outwards then towards the point of contact. Next, reinforce the bottom of the paper with a slightly thicker material, in this case, a piece of cardboard. Observe the same scenario again and notice that it now requires more force to push down. thus prevent deformation. In this case, the distribution of force is now spread across a larger surface area. This minimizes stress points, which, in this case, would be where the GTS/GT4 wing is mounted. The added support counteracts the downward force applied at the top of the airfoil to the trunk. Because our trunks are made of aluminum, they are easily deformed when direct contact is made. You sandwich the trunk between the wing mount and trunk plate because the GTS/GT4 wing mounts are bolted in from the bottom. This configuration creates pressure pushing up against the trunk, generating a clamping force and resulting in a more rigid surface. At least that's how I look at it.. A good example is the APR wing mounts; they feature extended mounting plates to distribute force evenly, preventing deformation. Some wing mounts utilize the outermost edge of the trunk, effectively leveraging the double-layer pinch seams to mitigate deformities as well.
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01-08-2024, 04:16 PM | #5 | |
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if the whole surface of the plate was somehow secured to the trunk lid (epoxied on for example), then it makes sense. the whole plate is engaged, and you're now trying to deform a much larger piece of alu, so it's stronger. but in this configuraiton, it's just a glorifed washer. if there were lift on the spoiler, ok fine that makes sense. but i don't get the downforce piece. or are you sayinf that it's helpful because now the entire foot of the spoiler is engaged, instead of just the two screwheads? in that case, why make it so much bigger than the foot of the spoiler?
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01-08-2024, 04:46 PM | #6 | |
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I was mocking up wing brackets for my M3, and I thought, 'This could work... as an example,' but I could see why it wouldn't work as an analogy just made sense once I put the cardboard under. You should see the M235Ir wing brackets used on the M235iR race car; it has a pretty neat support piece for the trunk. And yeah, that BK mount is just a giant washer to support the underside of your trunk. As far as the downforce goes, if you have this wing, go and press on the wing with some force and see how much force it requires to flex the trunk. I think the GTS/GT4 wing generates minimal downforce, but enough to deform the trunk without the support underneath. you don't need such a large surface area like burkhart uses dj_dub has a good alternative with just a strip of metal. see below. the M235IR wing support is the image below the E90M.
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01-08-2024, 05:39 PM | #7 |
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Actually, the issue is the wing pulling up on the trunk lid. The rear of the wing support is pushed down but the front is pulling up on the trunk lid. So extra material makes sense especially for the front.
What you really need to do is make the rubber bump stops on the trunk lid solid and reinforce any spots where the trunk lid bump stops come into contact with the chassis sheet metal.
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01-08-2024, 07:32 PM | #9 | |
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01-08-2024, 08:03 PM | #10 |
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Ok, that makes sense. And that 235 mount is intense.. might try to mock something like that up.
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01-09-2024, 01:00 AM | #11 |
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you want the wing to be as rigid as possible. you're just spreading the load as much as possible. since most uprights are angled with two bolts, if you're pushing down on the rear bolt, you're pulling up on the other. a wider footprint simply helps increase rigidity.
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01-10-2024, 11:08 AM | #12 |
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this is interesting.. was re-watching the video clip of the GT2 drive by from the main forum, and noticed how the spoiler is mounted here
hard to tell from the video clip if it's mounted topside to the quarter panel, or sitting inside the seam, but regardless it's over a much stronger structural point than the trunk lid...
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01-10-2024, 11:34 AM | #13 | |
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01-10-2024, 03:00 PM | #14 | |
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01-11-2024, 12:45 PM | #15 |
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this is kinda like what they did for the G82 M4 GT4 cars, notching the trunk lid, and chassis mounting the wing:
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02-09-2024, 12:01 PM | #16 |
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Curious what the solution would be to mount my Voltex Type 1S spoiler to my Seibon CF Trunk (fiberglass structure with carbon outer)?
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02-10-2024, 08:14 PM | #17 | |
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