Re: Re: carbon VP hub data?

From: Kevin Lamers <kevin.lamers_at_gmail.com>
Date: Tue, 5 Mar 2013 18:52:01 +0100

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_gmail.com>

> **
>
>
> 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 - 09:52:02 CET