Welcome Guest! To enable all features please try to register or login.
Go to last post Go to first unread
Offline Dennis P  
#1 Posted : Wednesday, January 3, 2018 11:57:01 PM(UTC)
Dennis P

Rank: Newbie

Posts: 3

Thanks: 1 times
Was thanked: 5 time(s) in 2 post(s)
I am getting ready to cut new wing cores for a Giles G202 I started to build many years back. The plane was all framed up and the cores for the wings and stab where cut. I finished up the stab and elevators but never finished the wing. The project stopped and I cannot remember why, but it is time to finish it. I plane on attending a few IMAC events with it and so I have been looking at different airfoils. I made up template patterns of a S8035 14% airfoil which has a bit more forward high point and a little thicker front to the wing. The plane is based on the old Midwest 27% G202 kit which has a 72" span and around 970 sq" of wing. It will have a 3W24 for power. Does any one know much about my possible airfoil choice or a better option with an explanation. Hoping for a final max weight of 11.5 pounds, hopefully less. I know it is an old girl but it needs to see the sky. IMG_1563 (002).jpg (113kb) downloaded 1 time(s). IMG_1557 (002).jpg (64kb) downloaded 1 time(s). Thanks for any advice.
Offline Jim7216  
#2 Posted : Thursday, January 4, 2018 6:40:14 PM(UTC)

Rank: Member

Posts: 29

Thanks: 8 times
Was thanked: 5 time(s) in 5 post(s)
I scratch built a similar sized Extra and used that very airfoil. The plane flies fine. I also scratch built a 41% Extra and used that airfoil but reduced the thickness to 12% instead of 14%. The trend in aerobatic airfoils seems to be going with thinner airfoils. My 41%er also flies well. I am not an expert and I am sure there are people with more knowledge than me but I think that airfoil would work fine.
thanks 1 user thanked Jim7216 for this useful post.
Dennis P on 1/6/2018(UTC)
Offline Jerry Hailey  
#3 Posted : Sunday, January 14, 2018 9:23:06 PM(UTC)
Jerry Hailey

Rank: Advanced Member

Posts: 144
United States

Thanks: 31 times
Was thanked: 45 time(s) in 27 post(s)
The S8035 14% should work fine. If you do thin to 12% you might want to move the high point even further forward. As is it's not as far forward as some of the modern wings.
Dropping to a thinner wing, in general, reduces drag but you also lose a bit of lift. Don't worry about the lost lift. It will fly just fine plus it will help your spin entry.

IMAC Education Committee
IMAC Sequence Committee
IMAC Rules Committee
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.