Planning the shape?
This is where building with translucent twinwall really comes
into its own. Don't worry if you're not using the clear stuff
as the techniques can easily be used on coloured sheets.
With translucent sheets, all your sketching and shape planning
can be done directly onto an MDF building board, and then cut
out of the twinwall simply by tracing through the sheet over
Tip: You can also fit numerous different aircraft designs
onto one side of a board.... simply draw each shape in black
fineliner pen and then go over the lines with different coloured
Firstly decide on the shape of your wing. If you're attempting
a scale looking aeroplane then this will have been decided for
you. If not, then maybe take a look at these examples for some
Some general wing shapes
There are an endless number of variations you could come up
with from a straight non-tapered plank wing to an elliptical
swept forward. Experimenting is fun but remember, you need a
straight line for the majority of the leading edge (LE). Please
note, these patterns do not show allowances for control
surfaces - they are merely to illustrate a basic wing concept.
Given that many sheets of twinwall may not large enough to
build a wing in one piece, it's advisable to split the wing
into sections. Most practical wings will be simple left/right
halves though it's possible to go for three or four sections
on longer wings.
However, for the purposes of keeping it simple, let's stick
to left and right. These two piece wings can be made very strong
and reinforced at the root simply by wrapping a couple of layers
of clear tape around the join or a central wrap of twinwall.
Our 6x4mm carbon tube makes an excellent spar for many wing applications. The carbon can be simply taped inside the lower surface using our Scotch tape and is therefore reusable. We also supply a short length of suitable size wire to make a dihedral brace / wing joiner. This fits perfectly into the 6x4mm carbon tube and is supplied straight, to be bent to your required angle in a vice.