ORIGINAL: highfly3D
I am working on a pattern wing design it will be a foam wing. My question while cutting the foam wing is will the main root rib & tip rib be at same height i mean 0 dehideral.. OR i was thinking to put the tip rib at the level of root rib to get some dehideral on the wing. please help me on this... what is the best way to do it.
This is a 40 size pattern plane design i am working on.
Thanks..
High
A 40 sized pattern model will most likely have a one piece wing.
Don't fret the foam cut so much. A simple way to do it is to mark a center line around the foam block and place the templates on the line, root and tip. Make the cut as needed.
After the sheeting is done, simply sand the root of both cores to get the dihedral you want. In general we join wing halves up side down on a flat surface. If you want about a degree or two (depending on your span) just build the top side flat on the surface. This works well if the wing is to be located within 1/2" or so of your fuselage reference line
If the wing will be located lower on the fuselage, then block the center of the wing halves some, as much as 1/4"-3/8".
If the wing will be on the bottom of the fuse, block up the center of the panels more, to as much as 1/2" or maybe more
A pattern plane flies best when there is zero roll coupling when you apply rudder. Luckily, this is the easiest thing to fix when building a wing.
Good luck