First Scratchbuild--need help with airfoil
I am kit bashing a couple different planes into a Skymaster push/pull twin. There are twin booms going back to the horiz. stab with a vertical fin and rudder on each boom.
The fuse is from an LT-40 that I cut off behind the wing saddle and added a rear firewall.
Wing is from a 60 size Ace Bingo. If your not familiar with that---picture a 4*60 semi-symetrical wing with a cord about 10.5"
This is long and complicated--please bear with me:
The center section is 28" wide. The booms are permanently attatched to the center section--which is removable from the fuse via the standard dowel and bolt system. So-when you pull the center section of the wing--the booms and all tail surfaces come with it.
My total wingspan is 84".
I have a removable 28" wingtip--outboard of the booms on each side. 28" center section + 2 wintips at 28" = 84" total
I'm using 3/4" aluminum tubes and phenolics for my removable wingtips.
The problem is that the distance in between the upper and lower spars is about 1/4" WIDER than my phenolics. Thats a lot of area to fill.
Also--the cord is a bit short. I'm using the saddle from the LT-40 and it's about 2" longer cord than my Bingo wing cord.
I was wondering what effect it would have if I made the overall wing THINNER and increased the cord?
If I make the wing thinner---then I can space the upper and lower spars at the right distance to encapsulate my phenolics perfectly--without having to fill a bunch of area between the spars and the tubes. Then increase the overall cord to make it fit in the saddle on my fuse.
So--thinner wing--but longer cord. Semi-symetrical airfoil. What do you think? How will it effect flying characteristics? How will the lift change on thinner wing with a longer cord?
This is NOT a crazy aerobatic plane for 3D. I might do some loops and rolls with this airplane--but no snaps or wild stuff. I just want to build a semi-symetrical wing that will provide some sport aspect--but still be plenty adequate for lifting this plane.
Estimated weight is 8-10 pounds.
Thanks