John -- Here's a link you might find useful for detailing the 4" gun. I also have pictures/drawings of the Hotchkiss Machine Gun, Lewis Gun, and Browning .50 cal (water-cooled twin mount) --as well as the Vickers 0.5" and 2-pdr pom-poms -- just some of the weapons that might have been employed on armed trawlers..
4 inch Breech Loading Gun


(These are not the same as "American" weapons, so should you need the info just send me a message. Since your trawler though under USN Command had a British Crew, it would seem to me it probably had British Weapons.)

Dodgy-- have you tried contacting RCN/RN Vet groups? The Imperial War Museum would probably have the final word on this -- but last time I looked theor "reasearch fees" were awfully steep! You've done an amazing job ferretting out and "deducing" just what you've found so far...!

Wouldn't Corvettes have continued to use "passive sonar" --hydrophones --even with the advent of Asdic?

Dodgy -
I quickly scanned a few books,
North Atlantic Run
HMS Agassiz
Canada's Flowers
Warships Perspectives

It seems that RCN Flowers had only the 123A ASDIC -- and had no gyro compass, making the whole a/s-nav problem difficult. I suspect that sound room simply contains mechanisms for, and access to, the dome & is not a place to retract into.

I have got to set aside a winter to read all this stuff I have ...
And get started on my own Flower kits ...

John

Killick,

Bobslr has very kindly provided me with some more scans of plans showing shape and placement of the dome on the Flower, and his plans show the dome with the stalk as being retractable. There is a small room in the hull just above the dome with a winch.

I am not really building this to tight scale - so I don't want to spend research money to satisfy a whim! I just wanted to put in what I thought was an important part of the ship. Perhaps I should make it retractable via R/C!! Your help has been much appreciated.

I suspect in reality that the Flowers (and other small ships like your armed trawler) were constantly being modified with whatever was to hand, especially in the early stages of the war. So alomst any armament set probably existed somewhere at some time.

Funnily enough, I have seen no reference to passive hydrophones anywhere. I assume the Flowers must have been equiped with them, but they were probably not used much in heavy Atlantic weather with a 40-ship convoy all around you. I hope that doesn't mean another dome I have to locate!