This carbon fabric is very light. Is it unidirectional fabric? Is the weight of the prepreg (17g/m2) with or without the epoxy. That is, is it just the weight of the carbon or does it include the epoxy? 17g/m2 is a bit under 1oz/sq.yd. In the US, we can commercially buy 1.5 oz/sq.yd. unidirectional fabric but(2 cm wide) unidirectional tape is rare at times and expensive.
Also, how long did the prepreg keep? Did you refrigerate it?
For light weight carbon tubes, have you played with wrapping individual tows or carbon?
Leo
--- In Indoor_Construction_at_yahoogroups.com, Kevin Lamers <kevin.lamers@...> wrote:
>
> Hi Kang,
>
> The carbon tubes (both the spar and hub) are made of IM carbon (T800)
> prepreg 17 gram/m2. The outline is made of UHM carbon (M60) roving.
> I have checked the individual weights and they are as follow:
>
> Blade (outline+ribs+balsa spar+covering): 0.074 gram
> Carbon spar (including aluminium bearing and actuator wire): 0.018 gram
> For 2 blades + spars: 0.184 gram
> Hub: 0.078 gram
> Total: 0.265 gram
>
> I now figure that I should half the length of the carbon spar and make the
> balsa spar a little longer, to save some weight (and make the outline
> thicker)
>
> I haven't had the change to fly it yet since I still have to build the rest
> of the model. I have made some F1D's a couple of years ago, in the mean
> time I was only doing F1B, and I figured it would be nice to give it a try
> again. So here I am ;-)
>
>
> Best wishes,
> Kevin
>
>
>
> 2013/3/5 Yuan Kang Lee <ykleetx_at_...>
>
> > **
> >
> >
> > Kevin,
> >
> > looks very nice. What materials are the spar and outline made from?
> >
> > Have you had a chance to fly it ?
> >
> > -Kang
> >
> >
> > --- In Indoor_Construction_at_yahoogroups.com, Kevin Lamers wrote:
> > >
> > > Hi Mike,
> > >
> > > I have to check tonight for the exact numbers, but by heart about:
> > > VP (just the centre, not the extended carbon tubes): 0.08 gram
> > > 2x blade + extended carbon tubes: 0.185 gram
> > >
> > > At least the total is 0.265 gram, see picture.
> > >
> > > Best regards,
> > > Kevin
> > >
> > >
> > >
> > >
> > > 2013/3/5 mkirda_at_
> > >
> > > > **
> >
> > > >
> > > >
> > > > Hi Keven.
> > > >
> > > > What does the hub weigh minus the prop spars/outlines?
> > > > And what does the entire prop weigh?
> > > >
> > > > The design is interesting to me mainly because I HATE tying kevlar
> > > > hinges... LOL.
> > > >
> > > > Regards.
> > > > Mike Kirda
> > > >
> > > >
> > > > --- In Indoor_Construction_at_yahoogroups.com, Kevin Lamers wrote:
> > > > >
> > > > > Here a carbon hub I'm working on currently. The main tube weighs 15mg
> > > > > including the bracket for the screws. The tube is 2mm ID and has a
> > 0.05mm
> > > > > wall thickness (2 layers 17 gsm prepreg).
> > > > > I hope the attachment gets through.
> > > > >
> > > > > Kevin
> > > > > Op 1 mrt. 2013 21:13 schreef het volgende:
> > > > >
> > > > > > **
> > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > I vote that you show all of us your unproven hub so we can all
> > pick it
> > > > > > apart before you perfect it.
> > > > > > On a personal note, all this talk of carbon, kevlar & fiberglass
> > has me
> > > > > > thoroughly confused. I need pictures.
> > > > > > Gary Hodson
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
>
Received on Tue Mar 05 2013 - 15:08:09 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:47 CET