LED and section question

[flo]

Hi all, for a future projekt i have two aerodynamical questions.

The plane is planned to get 1,8 m wingspan and hopefully no more than 6 kg. Speed is planned in "mid-range", think of a bomber/attacker instead of a fighter-aircraft.

A wing of a halfspan of 75 cm, inner depth 43cm tappering to 13 cm at the tips. LE is angled abckwards about 18 deg, while the TE is angled backwards some 4 deg. All of this is just aprox, as by now i do not have good drawings.
Ok:
Is it possible to use a NACA 2410 at 0,5-1 deg incidence at inboard and NACA2412 at tip without further washout? (i do not like washout too much as to my opinion it spoils inverted flying).
And secondly will Leading edge Drops give me problems on the said sections?
Which sections would work for a good mannered EDF (medium speeds) in my case.
Thanks for your sugestions/opinions
greetings
flo

[Sparky Paul]

The basic setup.. thicker at the tips will work.
Anything stuck on the leading edge will screw the whole thing up, in terms of efficiency. The disturbance to the airflow is much greater at model dimensions than the same thing in a full scale.
The plain wing sections will do what you want without any aids.

[flo]

thanks Sparky Paul.

Someone out there using an aprox similar planform? Which sections are u using?

greetings
flo

[flo]

hi,
i did get a pm telling me, that on a swept (back) wing, the tip section should be thinner,than at the rute.
so now i am confused.
any swep-wing designer please share your findings.
thanks
flo

[biber]

Try www.aerodesign.de, this page in particular: http://www.aerodesign.de/profile/profildicke_aero.htm.

There you can find some information on such things. As I see you are posting from Germany, I suppose it to be a minor problem, that it´s written in german language... ;)

biber

[flo]

thanks biber,
i will read it.
flo

[Arvid K. Gromhol]

I am working on a design that is 195 cm in span, weight about 4,3 kg, wing area 0,43 m2, root chord 32 cm tip chord 16 cm, profile ClarkY 15% thickness, wing washout 3 degrees. Hopefully it will fly with 0,91 4-stroke.
What do you think?

[Arvid K. Gromhol]

Back to your wing: It seems to me that the nominal wing loading is on the high side.
If you for some reason maintain this wing loading, it is my advice that you use a profile that provides more lift than the ones you have selected.
With respect to washout: As you have selected an asymetric profile, it would not be very good at inverted flight anyway, so I would have used a 3-4 degrees washout.
If you wish to see my view on wing loading, go to "Modeling Science" on the opening page.