By bkadv - 8/14/2018 5:11:32 PM
Hello all i just finished a tour around the world on this motorcycle. I want to replace things and make this bike lighter overall. I want to start with the rack and work my way later to other projects on this bike.
I want to make a side pannier rack. I already have a custom made one but its steel and heavy.
The characteristics I am looking for in this project are: Great in tension(pulling on rack), impact resistance, abrasion resistance and lightweight
this is a mock up using MS paint along with a picture included of my motorcycle with the steel pannier rack
I am thinking of getting it in 10mm thickness
https://www.easycomposites.co.uk/rigid-foams/easycell75g-infusion-grooved-closed-cell-pvc-foam-core.html
shape up the mock up in my MS paint drawing with this easycell75G, connect pieces with glue, sand around the edges to get it into circular/tube shape.
then cover it all with 1 layer of Kevlar, 1 layer of 3D core and final outlayer of Carbon 2/2 twill 200g
Around the bolt plates in the picture, I will reinforce it with 1x small piece kevlar around the bolt hole and 2 extra layers of carbon fiber. So when bike crashes, the bolted joints to the frame of the motorcycle doesnt snap easily.
What do you think? can i get feedback on this plan. Maybe I can use some other core?, use different layer?
Thank you ,
- BkADV
i am fine with a total thickness of around 0.75 inches.
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By oekmont - 8/16/2018 5:30:10 AM
What weight of carbon => usual 200-240g/am
What are you hoping for with the Kevlar? Kevlar provides crash safety. That means 2 things:
-in case of a crash there will be no big parts flying around
-it is harder for an object to penetrate your structure
It will not prevent your part from being damaged and useless.
The second benefit obviously doesn't do you any good here. And for the first... If it's a high speed crash you have bigger problems like flying luggage. If it's a low speed crash your luggage will fall to the ground from less than a metre, instead of hanging from the aramid threads and potentially get stuck in your back wheel. If you think you need that, a single rowing aramid around the part, placed onto the core, would do just fine.
You would better off if you exchange the aramid layer with carbon, as this will make it less likely for the part to fail, instead of keeping it together if it fails.
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