Revell Type IX C (U505 Late) 1/72nd

[Mikesmatrix]

Good news plenty of power and controls all work. Just need to get this trimming sorted out

[salmon]

What size holes? A lot are not helpful if they are small. The holes need to be about 3mm or 1/8”, it seems anything smaller and water tension will fill that hole and resist opening up.

[Mikesmatrix]

There around 2mm with some at 3mm so that might be the issue

[Ralph --- SSBN 598]

Sam mentioned making a counter sink cut on the under side of the deck where you have holes through the deck.
This cone shaped area under the hole will concentrate the air bubble at the hole with ore area to exert pressure at the hole forcing the air through the small in the deck.
Try the counter sink cut before drilling more holes in the deck.

[Mikesmatrix]

This is my first sub build thanks for all the advice guys I will try the countersink method much appreciated