[secant0give]

Gday Jason

Quickly off topic, sort of. You are familiar with the airfoil of the 2m cores that you sourced for us.
I have done some prelim calcs however would like your thoughts on my plan. I intend to sweep the wings at a 33 degree angle, is that going to aerodynamically stuff things up? By my basic calcs I say no however will need some wing fences to stop spanwise laminar flow.
What do you think?

Cheers
Rob B

I can't see it being a problem at all, firstly your not changing the angle of sweep by that much.
The foil changes from root to tip any way, that's the main thing with those foils we are aiming for a tip section with a less savage stall, (ie can opperate at a higher angle of attack) than the root and I don't think that will change 'cause what ever slight change you do to the root profile you will also be doing to the tip profile.

Also it won't change the pitching moment because any change in shape of the foil caused by sweeping more or less for that matter will be symmetrical, same change on the top as on the bottom so no problem there either i wouldn't think.

As for changing the efficiency of the foil as a whole, I don't think you'd notice unless you did some very careful wind tunnel testing. it could even get better here but probably not by much.

For what you want to do with it I think it will make a very nice choice of foil.

I'm not sure you will need fences to stop span wise flow, but they might be an improvement, again weather it would be enough to notice it's hard to say?? As long as you have enough lateral area for stability in Yaw it should be fine Id think.