Raining here, so kept on drawing.
But I need a name: for this peculiar piece of … I remember time lost to develop it with pencil and ruler in my green years.
It’s “manica a vento”- italian – “manche au vent” – french – in eng. I found only “stoke-hole and/or air ventilator”.
Surely it must have a proper name.
As reward feel free to use it as .part in your drawings, it’s aligned so you can scale/rotate as needed.
Yep Cowl Vent……………… Normally rotates about its base. Large ones have a handle on either side to help rotation. Towards the wind/direction of travel – intake, rotate 180 deg – exhaust, ( or stops you getting a bath in a heavy sea).