Most of the torpedo bombers of the period also functioned as level bombers.
The R-2800 was proposed for the TBM-3, they went for the 1,900 hp R2600-20 instead.
Two aircraft were converted to the XTBM-5 configuration, a faired ventral step, removal
of the turret and conversion to two-seat configuration with twin-.30s on flexible mount
were among the changes.
Bu No 00550 was modified into a single-seater in July 1942.
The G-56 was a proposal for a developed Avenger with Martin turret and R-2800, one aircraft was
converted to test the turret. The twin-.50s were found to have a lower effective rate of fire than the
single gun turret due to the guns having to interrupted twice as often to clear the tail.
![](http://i729.photobucket.com/albums/ww291/joncarrfarrelly/TBF_MARTIN_01.jpg)
The PZL P.46 Sum has always reminded me of fixed gear, twin-tail Avenger.
http://www.airwar.ru/enc/bww2/pzl46.html![](http://www.airwar.ru/image/idop/bww2/pzl46/pzl46-2.jpg)