Wing Design Day 2
Updated: Mar 26, 2020
Drag and compression struts
Admittedly, there was a lapse in our detailed wing design documentation for the past two or three work days, but today, we designed the variablized drag and compression struts. The strut design and mounting was derived from the Affordaplane plans (with a couple modifications). This design involves using steel C channel brackets to support the drag and compression struts. These C channel brackets are secured to the leading and aft spars using two Air Force-Navy (AN) bolts (exact size TBD). We opted to use drag and compression struts as opposed to drag and anti-drag wires because it will remove the need to set an exact tension of the wires and will reduce future maintenance at the cost of additional weight and design complexity. The number of drag and compression struts can be easily adjusted with the variable DragStrutMultiplier which automatically distributes the desired number of drag and compression struts across the span of the wing. We also temporarily removed the rib lightening holes because they were tweaking out as we made any significant changes to the design. We’ll add them back in once we get closer to finalizing the wing design. We also removed the rib and false rib pattern because we realized it created an unnecessary number of identical parts which could just be patterned in an assembly instead of the part studio, keeping the design simpler and cleaner.
In order to reduce the weight of the wing, we opted to use a configuration of load-bearing primary ribs (grey in photos) and non structural false ribs (orange in photos). The false ribs will support the wing fabric evenly across its entire span without adding any unnecessary weight of full sized ribs. The false ribs will be attached to the leading spar and a special support stringer which runs parallel to the wingspan.
*Editors note: the thought processes and design choices presented in this article don't necessarily represent those implemented into the final design and are subject to change. Flight Club Aerospace is a group of amateur students with no formal education in any fields of engineering. We present this information for educational purposes only, with the understanding that it is not to be re-created without adequate professional oversight and mentorship. For our latest designs and updates, please see our most recent blog posts.