For the fore-aft direction what you need to compare the spar strength to
is unreinforced .035" thick balsa because that's about what you have in
a normal F1D spar.
On 2/22/2015 5:34 AM, Kevin Lamers kevin.lamers_at_gmail.com
[Indoor_Construction] wrote:
> That might be possible Tapio. It is a bit difficult to imagine how
> such spars would hold in reality. Maybe we should just try it in order
> to compare to normal grain wood.
>
> I just notice that they sell 1mm and 1.5mm end grain balsa over here
> (_*Balsastirnholzplatten)*_:
> http://www.heerdegen-balsaholz.de/home_ger.htm
>
> For normal sheets they allow density specification, I don't know if
> that is also possible for end grain balsa.
>
> Kevin
>
> 2015-02-22 7:03 GMT+01:00 Tapio Linkosalo tapio.linkosalo_at_iki.fi
> <mailto:tapio.linkosalo_at_iki.fi> [Indoor_Construction]
> <Indoor_Construction_at_yahoogroups.com
> <mailto:Indoor_Construction_at_yahoogroups.com>>:
>
>
> On 22/2/2015 0:30, Kevin Lamers kevin.lamers_at_gmail.com
> <mailto:kevin.lamers_at_gmail.com>
> [Indoor_Construction] wrote:
> >
> > Maybe, but besides that it will very difficult, I also think it
> will
> > be very weak when loaded in flying direction instead of lift
> > direction. So overall stability of the spar will be poor probably.
> >
>
> Wouldn't you think that the full-width carbon spars would not give
> enough rigidity in the flight direction? Agreed the spar
> configuration
> is not optimal in that direction, but maybe would give some strength
> though.
>
> I would construct spars with vertical webbing by making a sheet
> and then
> cutting the individual spars with circular saw. First laminate the
> oversized balsa to one sheet of carbon, and once cured, sand the
> balsa
> to final dimension and add the other carbon layer.
>
> -Tapio-
>
>
>
Received on Sun Feb 22 2015 - 15:39:54 CET