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Extra 300 Big Brother Wing

Updated: Jun 28, 2023

We will start with the left wing. simply reverse for the right.


Exploded Parts View.


Wingroot


Wing root orientation on build plate.


Left wing inboard section on the build plate.

Note that these are shown in print preview mode to illustrate that when properly sliced using thin "surface" mode, these parts will actually print a beautiful, hollow and light part with internal reinforcing.

Left wing outboard section on the build plate.

Left aileron inboard section on the build plate.

Take your time on these. If you start having trouble you may wish to slow your print speed down just a bit. Also, for build plate adhesion you may wish to enlarge your brim.

Left aileron outboard section on the build plate.

Left aileron control horn on the build plate.

Wing center spar on the build plate.

Spar mid section on the build plate.

Spar tip and spar doublers on the build plate.


Spar reinforcing:

Note that there is a groove on the top and bottom of all of the spar components. Once the spar is completely assembled, the spar is to be wrapped around this groove with either kevlar thread if available, or as an alternative we have found that upholstery thread found at any fabric store is more than adequate. There is room on the spar to make several wraps of this thread adding considerable tensile strength to the spar. You will want to pull the thread just tight enough, but not so tight that you warp the spar. Once taught, embed the thread in a layer of CA glue.

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