Rib and Aileron Reinforcements
We also decided to create a new “support rib” (pictured in yellow below) which will support the aileron torque tube at its mid point. We had tried to avoid using a support rib in the past in the hope that the two regular ribs adjacent to the aileron would be enough to support the torque tube but we now think otherwise. The support rib will also reduce bending in the torque tube which will help reduce the risk of it binding in flight.
Where did all the ribs go? Ollie admits that he got a little too obsessed with the parametric design capabilities of Onshape and he ended up making some design sacrifices just to preserve the variables. One of these sacrifices was deciding to use a uniform rib spacing. Since our spanwise lift distribution isn’t uniform and is actually closer to a quarter ellipse, rib spacing will increase towards the tip of the wing if an optimized placement is used. Until we know the strength of each kind of rib to optimize its placement, the wing will just have to look a little incomplete.