Phedon,
I am interested to hear how you make (want to make) your carbon tubes
weighing less then 200 mg. What materials will you be using?
As Kang already told I did some tests with tubes made out of carbon prepreg
(19 gsm) and they end up at 220 mg. Wall thickness is indeed very small
(around 0.001"), but sufficient. The complete motor stick with bearing,
hooks, extension tube and all posts will end up at around 330 mg.
I do have some ideas, using different materials to bring the weight down to
below 200 mg, but this is speculation as it hasn't been tried yet.
I attached a picture of my carbon tubes.
Best wishes,
Kevin[image: Inline afbeelding 1]
2014-01-31 2:55 GMT+01:00 Phedon Tsiknopoulos <phedon21t_at_yahoo.com>:
>
>
> I do not use low tech materials like balsa even though I have the best.
> I want my tubes to have identical characteristics. Balsa varies too much,
> no 2 tubes are alike. And it is 10 times more expensive.
> This is going to be an incredible breakthrough! Stay tuned! Adios Phedon.
>
>
> Sent from my iPhone
>
> On Jan 30, 2014, at 2:18 PM, "mkirda_at_sbcglobal.net" <mkirda_at_sbcglobal.net>
> wrote:
>
>
>
> John,
>
> Pick a motor stick length, balsa thickness, tube inner diameter and post
> height. I'll post the forces involved tonight.
>
> Regards.
> Mike Kirda
>
> --- In Indoor_Construction_at_yahoogroups.com, "John Barker" <john.barker783_at_...>
> wrote:
> >
> > Mike,
> >
> > You said 'simple engineering question Tapio' but then did not ask a
> > question. Can you give us a sketch of the mathematical model that you
> have
> > in mind, and then ask the question?
> >
> >
> >
> > John
> >
> >
> >
> >
> >
> > From: Indoor_Construction_at_yahoogroups.com
> > [mailto:Indoor_Construction_at_yahoogroups.com<Indoor_Construction_at_yahoogroups.com>]
> On Behalf Of
> > mkirda_at_...
> > Sent: 30 January 2014 20:09
> > To: Indoor_Construction_at_yahoogroups.com
> > Subject: [Indoor_Construction] Re: Exact Builder of Model Rule
> >
> >
> >
> >
> >
> > Simple engineering question, Tapio...
> > A mathematical model of the single post system and the stresses involved
> is
> > quite enlightening. The tube in most designs out there is in compression
> and
> > tension at the same time. The best method is for the tube to be in
> > compression only. Additionally the compression loads at top and bottom of
> > the tube should be as equal as possible to minimize points of failure.
> >
> > Regards.
> > Mike Kirda
> >
> > --- In Indoor_Construction_at_yahoogroups.com
> > <mailto:Indoor_Construction_at_yahoogroups.com<Indoor_Construction_at_yahoogroups.com>>
> , Tapio Linkosalo
> > <tapio.linkosalo_at_ <mailto:tapio.linkosalo_at_> > wrote:
> >
> > > Personally I cannot imagine how anyone can make lighter ones stand the
> > > strain (look forward in horror to Slanic with my current ones....),
> but
> > > I guess they do.
> >
>
>
>
- application/x-ygp-stripped attachment: stored
Received on Sat Feb 08 2014 - 11:56:18 CET