Ray
Thanks for the clarification. What do you use for the Simplex airfoil calculator/plotter? Have you tried the one I referenced?
I know tastes differ on whether to use EXE or EXCEL on math problems like this. I've used both, but have stuck with EXCEL lately because of the easy housekeeping and built in plotting. I've pulled the method out of the table in the one I tried, and will share it if anyone wishes.
Joe
--- In Indoor_Construction_at_yahoogroups.com, "ray_harlan" <rbharlan@...> wrote:
>
> I don't think there should be much trial and error if you do the following. Say you want a 3% cambered airfoil. For a 3" chord, that is .09" high. A 45 degree diagonal rib will be 4.24 long. .09/4.24 = .021 = 2.1% camber. Dividing the straigjht rib height by the diagonal rib length will give you the camber percentage. Just plot that Simplex rib along with the straight rib to get everything.
>
> Ray
>
> --- In Indoor_Construction_at_yahoogroups.com, "joemargbartek" <j.bartek@> wrote:
> >
> >
> > Aki san
> >
> > Thank you for confirming this.
> >
> > I have found a calulator on RCGroups from May 2005 which generates a
> > Simplex airfoil from Chord and % camber so I can get the 2 or 3
> > different templates for a mixed F1L or EZB wing. I opened the *.txt
> > file in the post listed below with Excel and was able to get tables of X
> > and Y for airfoils. I used the Graphing function of Excel to plot them,
> > after adjusting the axes of the graph to give a 1/1 printout. It might
> > be better to divide metric chords by 25, or perhaps change the step size
> > in the function, to make the calculator more friendly to chords in mm.
> > iIt takes a little trial and error to match the height of straight and
> > diagonal ribs by adjusting the % camber.
> >
> > Hope you and others find this useful.
> >
> > Joe
> >
> >
> >
> >
> >
> > RC Groups, Aircraft - General, Modeling Science, Simplex airfoil
> > formula?
> >
> > Simplex airfoil calculator by JMP_Blackfoot
> >
> > http://www.rcgroups.com/forums/showpost.php?p=3763107&postcount=15
> > <http://www.rcgroups.com/forums/showpost.php?p=3763107&postcount=15>
> >
> >
> > --- In Indoor_Construction_at_yahoogroups.com, "Akihiro Danjo"
> > <adanjo-373_at_> wrote:
> > >
> > > Joe san,
> > > Thank you for the correction. I also had realized my mistake but it
> > was
> > > about 2 hours after my posting.
> > > I am getting older.
> > > Aki
> > >
> >
>
Received on Tue Dec 04 2012 - 07:20:21 CET