i faceing the problum in hot side displacer
1:what is the volume ratio or compression ratio between hot and cold side.
2:what is the best gap between displacer and cylinder wall i do some research on it i find it 0.1-0.3mm.
3: what is the best matrial for displacer and displacer cylinder.
4: and where to connect exit for hot air on the displacer is it top of displacer or bottom of displacer.