I've made dummy engines for some friends and I thought some of you too might want a dummy engine. The use of the dummy is to keep the real gem out of the messy build while still getting the proper CG and avoid suprises when installing the real one. The purpose was not to make 100% super scale models. So far I have made the P20 and Kolibri turbines. My 3D printer is limited to a 8" cube, but it's easy to assemble multiple parts as long as the engine diameter is less then 8"
I made the dummy with a ballast tube for lead shots to obtain the proper weight too.
Here is the P20
