I yelled at my fellow pilots on EVERY flight which I did on the DC3 and DC4. If I hadn't, he wouldn't have heard a word above the million decibel roar of the engines. Sign language was used to the maximum, two fingers (palm facing of course) meant V2.
The only other time that I yelled at a fellow pilot was when the Captain became totally disorientated on a dark night takeoff, and at low level. There was no time for a polite "Excuse me", but an assertive "
I HAVE CONTROL" as I pulled out of the dive, literally feet above the trees.
TAA pilots will remember Ron Hume's bellowing call of "
FAILURE" during pre-V1 simulated failures during training. It sure left no doubt in my mind, and I have used it to the present day.
That's all in my shouting / yelling department.
Regards,
Old Smokey