hood problem

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beliblisk	b beliblisk posted 5 Years Ago HOT Topic Details
b Group: Forum Members Posts: 53, Visits: 2.8K	Hi guys. I ran into a bit of a problem today. So i made e46 m3 hood. All good except for a little bulge (located in middle kevlar/cf "island on the right side o)n the top side (that i didnt notice untill todat when i took glued item from top mould) :/ After mild postcure (sun so max 50*C atm) it came out great so somwhere from that point to prior of bonding halves together this happend (inbetween i was only cutting vent holes). Stack was as followed (top part) : -245 2x2 cf -600 2x2 cf -200 cf/kevlar All this time (apart from cutting & triming) paet was laying flat in mould to awoid any accidental damage in workshop. Halves arenow bonded and i can not seperate them again. I was thinking of heating it gently locally with heat gun and then put so soft weight on and let it cool of (as atm TG is quite low...... plan was to let it full post cure bolted on the car and then sand it and get it clear coated). Any ideas how this happened and any alternative ways to solve it? Thanks a lot Edited 5 Years Ago by beliblisk
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Hanaldo	Hanaldo posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Nah, weight is king, screw the rest 😉 Haha to be fair, I was mostly just jibing. Bonnets can be difficult to get a lot of weight out of, they are big flat panels. The rear clam I posted a photo of has so much geometry that even a single layer of 200g would be quite rigid. And for a vehicle needing OEM fitment solutions with hinges and the latch, you're pretty restricted with what you can do. So 6kg isn't bad at all. I dare-say you could get it down to ~4.5-5kg, but there's no real point.
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Steve Broad	Steve Broad posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 408, Visits: 4.1K	+x Hanaldo - 6/10/2020 3:26:14 AM Nah, weight is king, screw the rest 😉 Haha to be fair, I was mostly just jibing. Bonnets can be difficult to get a lot of weight out of, they are big flat panels. The rear clam I posted a photo of has so much geometry that even a single layer of 200g would be quite rigid. And for a vehicle needing OEM fitment solutions with hinges and the latch, you're pretty restricted with what you can do. So 6kg isn't bad at all. I dare-say you could get it down to ~4.5-5kg, but there's no real point. I experimented, making two small curved panels using one and two layers of 200gsm prepreg. I would have loved to have used one layer but this was just too flimsy and see though! I disagree with your comment 'no real point' :-) If you are making a part to reduce weight go big or go home! I would argue that lightweight parts have no real point on street only cars other than for 'street cred', whatever that is. But for that, you might as well skin or wrap :-) For track cars, if looking for lightweight you have to be serious about it or you are wasting your money, IMO. But then, I am anal about weight :-) This is two layers with a 20mm overlap of the 250mm strips of 200gsm it is made from. Layers are at 90 deg to each other.
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