Five Cylinder Rotary Plane Engine

A Rotary Air engine
You will need 20 m2.5 x 30(35 is better) cap screws to hold the cylinder heads and cylinder to the crankcase.
What I found the found with the printed holes is to tap them with a Metric2.5 tap with a battery drill slowly then put some super glue in holes and wait 5 minutes then screw the cap screws in.
you will also need some 1.8 mm spring steel pins(wire) or fine tooth picks also work. I used the spring steel. Its for the pistons and conrods.
Printer settings PLA fine setting.
https://youtube.com/shorts/5AHJ9695xys?si=1lAhxK1U2TOlpqJK