Clerget 9B engine

thingiverse

Dummy Clerget 9B engine built in 1:5 scale. Originally designed at a smaller size and enlarged to 1:5, with several minor modifications made to address specific issues. The finished model was printed on a Creality Ender 3 without supports and with only a skirt - no brim or raft used. Inlet tubes were printed with their backs up, using supports and raft, but with the support overhang angle set to 80 degrees to minimize the amount of support material needed. Valve rockers have holes for inserting 16swg piano wire (or 1.5mm carbon fibre) pushrods. Three cylinders feature through holes for attaching stand-offs, although there is interference with inlet tubes to these cylinders. This was why one of the inlet tube STL files had a large cutout in it; printing six normal tubes and three with cutouts solves this problem. The joining ring is glued into the front half of the engine before assembly, ensuring good alignment between the two halves. The motor appears somewhat bulky. With piano wire pushrods, all-up weight comes out to 146 grams (5.2 ounces). Nonetheless, most WW1 models tend to become tail-heavy during flight, so a bit more weight up front is always welcome. Scale detail takes precedence over added weights like lead every time.