This is a generic 7 Cylinder radial engine for use with electric RC models. The model is not specifically based on any particular engine but looks good enough for most purposes, particularly foamies and parkflyers. I printed a version at 75% and use it on a 72" span foamboard PT-17 Stearman. The engine looks great and gets lots of compliments at the field.
Incorporated into the back of each cylinder is an "exhaust" port that allows hot air from the motor to escape. The 75% model has PLENTY of clearance for an eflite Power 60 or the new FT Monster Radial motors.
I hope to get an assembly instruction video shot before too long and will share that as soon as it is available. It is not difficult to assemble but there are some tricks that make it easier and improve results. I'll cover those ASAP. I suspect most modelers will be able to figure it out.
Added an adjustable mount 8/18/2019. This will allow you to screw the motor to the firewall for easy removal and maintenance of motor. Once you have it positioned how you want use epoxy to permanently attach radial to mount.
See the Stearman flying with this engine HERE: https://www.youtube.com/watch?v=FTYiqbTgJ-M
Infill and raft/support varied by part. The version shown in these pictures was printed at 75% and fits well on a 72" PT-17 Stearman model. I've printed it down to approximately 35% with good detail retention.
Model was painted with primer and Krylon paints and assembled with CA and Epoxy. Mounting to RC airframe will depend on the model constraints but was not challenging.
For pushrods and Cylinder detail parts I used painted BBQ skewers and leftover pushrod material. I hope to add more images soon of a larger, non-flying desktop model I am printing now.