Re: Re: carbon VP hub data?
My philosophy was to use carbon to make the prop and especially the hub
stiffer in order to get better accuracy in adjusting it. I figured if I
would get near the weight of a balsa hub, it would be worth it.
The main difficulty is having material that is thin enough. One layer of 17
gram/m2 and wrapped with thin kevlar thread gives a nice result, this makes
the wall thickness about 0.03-0.04 mm.
I can send you a tube I made. I can also send you some of the prepreg I
used, so you can play around yourself. It is quite easy to process. Send me
an email off list to tell me what you prefer.
If anybody else is interested, I can send more prepreg around, but I won't
have enough tubes to send around the world ;-)
Kevin
2013/3/5 Yuan Kang Lee <ykleetx_at_gmail.com>
> **
>
>
> Kevin,
>
> Would it be possible for you to send me a sample of the spar? I would love
> to see it and test it.
>
>
> -Kang
>
> --- In Indoor_Construction_at_yahoogroups.com, 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
> >
> > > **
>
> > >
> > >
> > > 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 - 11:57:18 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:47 CET