Hi can anyone help I've just brought my first airbrush it has a 3mm nozzle which is a small spray pattern ok for small bits and 1/350 aircraft I've also brought a 5mm and 8mm nozzle and needle for larger spray jobs. What I would like to know is when i change the nozzle do I have to change the long needle at the same time ?

Yep...the nozzle set have always is own needle and nozle cap

with some difference from producers but pretty mutch like this...

https://www.wonderlandmodels.com/products/revell-basic-airbrush-nozzle-needle-set/

Thank you very much vicious. That makes sense just wanted to be sure only using a 3mm nozzle it took ages to spray a 1/350 aircraft carrier hull and flight deck best wishes john