hood problem

Author	Message
beliblisk	b beliblisk posted 4 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 4 Years Ago by beliblisk
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Warren (Staff)	Warren (Staff) posted 4 Years Ago Post Details
Group: Administrators Posts: 2.5K, Visits: 8K	Every gram counts guys. LOL. Still, 6kg is a massive saving over the OEM steel version. But you could certainly loose more if you wanted it really light. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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Steve Broad	Steve Broad posted 4 Years Ago HOT Post Details
Group: Forum Members Posts: 408, Visits: 4.1K	+x Warren (Staff) - 6/9/2020 10:24:10 AM Every gram counts guys. LOL. Still, 6kg is a massive saving over the OEM steel version. But you could certainly loose more if you wanted it really light. Absolutely! An old race car builder back in the day told that that once you had removed the easy weight, in order to remove the next lb (told you it was a while back :-) ) you have to remove an ounce from 16 places. However, you can go too light, compromising structural rigidity, so I have to keep reining myself in :-) Edited 4 Years Ago by Steve Broad
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beliblisk	b beliblisk posted 4 Years Ago HOT Post Details
b Group: Forum Members Posts: 53, Visits: 2.8K	Well OEM alu sits at 10.4kg. Top half weights 2.5kg and its 1mm thick. This bonnet is quite big as i just managed to get 1.5m cf cloth to fit OEM closing mechanisms will be used and with these you really need to push a bit on the hood (i imagine something much thinner would just warp to much). Ill post more pics (including guns ) once i try to correct "island" Edited 4 Years Ago by beliblisk
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Steve Broad	Steve Broad posted 4 Years Ago HOT Post Details
Group: Forum Members Posts: 408, Visits: 4.1K	+x beliblisk - 6/9/2020 11:24:29 AM Well OEM alu sits at 10.4kg. Top half weights 2.5kg and its 1mm thick. This bonnet is quite big as i just managed to get 1.5m cf cloth to fit OEM closing mechanisms will be used and with these you really need to push a bit on the hood (i imagine something much thinner would just warp to much). Ill post more pics (including guns ) once i try to correct "island" Agreed, there are considerations other than simply weight that have to be taken into account. My Elan door weighs 2.6kg including polycarbonate window, hinges, locks and handles. However, I added a couple of extra layers (door is two layers of 200gsm prepreg) in the area where it will be pushed to close and where the hinges attach.
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