European custom bracket

[friendgr]

Good point, I would start with covering the full bracket with the black stuff as shown in post 16

And what about the extended nuts and rivets? That's the main problem.

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[Notes]

And what about the extended nuts and rivets? That's the main problem.

I know, all I can figure atm is the bolts shown here and thick rubber tabs.

 

[friendgr]

Or we can place it backwards!!

The flat screw behind the plate so almost ZERO extend and in front we can use blind INOX nuts. Industrial look :-))

More easy for stealing the plate but no back extension.

 

[papinist]

I would not mind so much... normally we would have the plate screwed onto the bumper, so definitely with holes and scratched. With a plate holder like this we have no holes and scratches, eventually in some conditions we risk to have some scratches and dents.
It could be ok for me.

 

[Pichon]

[MENTION=14187]friendgr[/MENTION] : i understand your point with bending under hard conditions, but one important thing : the plate holder isn't made with aluminium, but with stainless steel, which is really harder thon aluminium. The bending should be a lot less than you expect...

 

[Pichon]

A little bit time to explain a little bit more :

If you look at post #20, you could see i've made a computational fluid dynamics study on my plate holder.
At 200km/h, the max bending at the end of each side is 9,5mm.

But this is in the worst case :
1- i've not taked into account the central contact point (where rubber pads currently are) with the bumper : you could see on the picture of the deformed shape of the plate holder that there is a deformation in direction of behind, above the bend on the part : it's taked into account when i say 9,5mm, but it wouldn't happen (contact point of the rubber pad on the bumper) --> we already have less than 9,5mm

2- the plate itself make a big profit in the bending problem : if it is screwed or attached with rivets on the plate holder, you make a new "material ", a multi-layered one : the plate is secured to the holder, nearly no "slip" is allowed between the 2, and so the holder can't bend like if it is alone. You could find something a little bit the same in the wood industry, with Glulam (glued laminated timber), wich is really stronger than a simple wood piece of the same dimensions.
So we have less than 9,5mm for the second time (9,5mm is really the worst case, i insist on that, but it's really important to understand that, and the conditions of my study compared to reality)

That said, to convince you bending isn't a problem, we have the length of screws or rivets.
Look at this picture of Craig's custom bracket mounted on a S550 Mustang:

You could see the bumper as a sharp edge on the middle (when you look at it from the front of the car) and then go in direction of the back on each side.
Plus, this american plate holder is really smaller than mine (US plates are 30,5cm long), but you could see on the picture, nuts are far enough of the bumper.

So, it's why, for me, if i've not forgotten something bigger than an elephant, less than less than 9,5mm, with a sharp edged bumper, it won't touch the bumper, never.

If you see something i have forget to mention, or you don't understand, feel free to ask, i'll do my best to answer [emoji6][emoji108]

Pichon

 

[friendgr]

Thank you Pichon for your detailed reply.
I'm more than happy that the plate holder is made from stainless steel. I agree that the bending will be far smaller.
BUT
with the middle screw at the base under the bumper there is always a possibility the whole plate to twist a bit left or right.
I don't know based on photos how secure lock the black screw.
It is known to everyone that the only secure way to avoid twist is using two points instead of one.Correct?
I mean that IF the whole plate is twisted a bit left or right, then the max. bending will be SMALLER than 9.5mm at one side. I don't know if you get my point.

How do you ensure that the plate will always be centralised and not twisted?

 

[Pichon]

[MENTION=14187]friendgr[/MENTION] :
You are right for this point, for the first prototype (received by [MENTION=14834]John577[/MENTION]), i've nothing done to ensure there is no "twist" around the middle screw. The only way to "secure" that is to tight really hard the nut.

For the second plate holder sended (to [MENTION=14076]Notes[/MENTION]), who gave me the length i needed to finalize the design, i've added another bend on the plate holder, at the end of the slot where the threaded insert goes through. The goal of that is to have another contact point, on the grid under the bumper.
I'll try to post a picture of that ASAP, to help the understanding.

But the big point is you're right, the "twisting " is the last thing i have to validate. [emoji6]

Pichon

 

[Notes]

@friendgr :
You are right for this point, for the first prototype (received by @John577), i've nothing done to ensure there is no "twist" around the middle screw. The only way to "secure" that is to tight really hard the nut.

For the second plate holder sended (to @Notes), who gave me the length i needed to finalize the design, i've added another bend on the plate holder, at the end of the slot where the threaded insert goes through. The goal of that is to have another contact point, on the grid under the bumper.
I'll try to post a picture of that ASAP, to help the understanding.

But the big point is you're right, the "twisting " is the last thing i have to validate. [emoji6]

Pichon

Hey Pichon, do you have any pictures of the one you send me? I'm getting a bit confused with the bend in the holder, as this is not the case on the black one where the design was based upon. Thx

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