This is the flywheel that is on my green twin (shown in the photo above).
It had a few sand inclusions because I used Petrobond with iron instead of resin-bound sand, but I was able to repair them.
Nice clean metal inside, no hard spots or internal voids, and easy to machine.
I got lucky on this flywheel.
This was literally my first gray iron casting.
It took me quite a few more years to be able to consistently cast high-quality gray iron parts, especially thin parts.
It had a few sand inclusions because I used Petrobond with iron instead of resin-bound sand, but I was able to repair them.
Nice clean metal inside, no hard spots or internal voids, and easy to machine.
I got lucky on this flywheel.
This was literally my first gray iron casting.
It took me quite a few more years to be able to consistently cast high-quality gray iron parts, especially thin parts.
![R2-IMG_5030.jpg R2-IMG_5030.jpg](https://cdn.imagearchive.com/homemodelenginemachinist/data/attach/92/92306-R2-IMG-5030.jpg)
![rIMG_5046.jpg rIMG_5046.jpg](https://cdn.imagearchive.com/homemodelenginemachinist/data/attach/92/92307-rIMG-5046.jpg)
![rIMG_5088.jpg rIMG_5088.jpg](https://cdn.imagearchive.com/homemodelenginemachinist/data/attach/92/92308-rIMG-5088.jpg)