Hello John:
Thanks for your help.
...but could it be part of the launch rails for RS82 rockets?
It was my first thought,but should be two rails not one.As far as I know,the only Kittyhawks fitted with rocket launchers were the Klimov engined birds.
... I took the liberty of looking at the other P-40 photos in your album, and two of those aircraft have the launch rails fitted.
One is a Tomahawk and the other a Klimov engined Kitty.
This is an enlarged view:
The green arrows point to what looks like two fins in the downside of a rail,could be some kind of sway braces?
Greetings:
Martin