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Thread: Lyrebird Cycles

  1. #161
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    Default DIY Prepreg Redux.

    I have previously covered DIY prepreg using high TG epoxy and woven carbon. Until now unidirectional prepreg has been a problem but I've worked out a way of making my own, which means I can use the higher spec tow I use for filament winding. I am using Toray T1000 here which is 300 GPa vs about 240 for the commercial prepreg.

    I set up the filament winder with a drum of appropriate diameter covered in non-stick paper:



    and set it to hoop winding with an appropriate feed rate (2 mm for the 12k tow):



    (sorry for the shit pic, camera autofocussed on the winder not the drum).

    Whe finished I simply slice the non stick paper and cure in the oven to beta stage et voila, unidirectional prepreg:


  2. #162
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    Default Re: It's been a long time coming

    Quote Originally Posted by Colinmclelland View Post
    Hi Mark,

    Can you tell us more about the carbon dropouts in FNL?
    It's been a lot more than a week but here they are:


    Polydrops

    Sorry but the combination of black dropouts on black carbon and my shit photography aren't going to light the world on fire.

    They worked out well but the next frame will use Paragon's "Bolt On Brake Interface" which should be easier to adapt, I am hoping it work at least as well.


    K_Bike_Scales

    On the other hand, I believe this is the lightest wood frame yet made by some margin at 1056 g. My wife says I should have made it ten grams heavier.

    I'd post a pic but I forgot to take any of the frame.

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