HiBut the result was very disappointing.
It looks to me that the Alu was not able to push out the ambient air. Perhaps I filled it in to fast. I don't think the Alu cooled to fast, it came out very "liquid" from riser. Alu was at 700°C, the mould was pre-heated to 200°C, I used some salt as flux and wash soda for degasing.
I'm not sure where the problem resides. Maybe there is more than one
Or it is even not possible to make it this way
Any comments and suggestions are welcome!
View attachment 94880
Also tried this way, but the gravity produces to less force, to press the alu down and let the air come out. The result was not better as in the picture you quoted. Perhaps it would work, if you fill the alu very very slowly, but then it would cool down until you are finished.Hi
Maybe possible solution is simple mold by imprint the head pattern horizontally into sand with fins oriented down.