Macchi M.6

The Macchi M.6 was an Italian flying-boat fighter prototype that was completed in 1917 in order to compare it to the Macchi M.5 which differed from it in having a modified wing cellule. It had also Vee-type interplane bracing struts plus an sloping auxiliary vee struts that supported the upper wing making that way the parallel struts to be placed further outboard.
It was also powered by the Isotta-Fraschini V.4b that powered most of the versions of the Macchi M.5 and was armed with two Vickers 0.303 machine guns.
After comparative trials were performed between the M.6 prototype and an standard M.5, the results showed that the M.6 had not any advantage over the M.5 whatsoever, so it's development was abandoned and no more M.6s were built. The fate of the prototype is unknown.
Also, as there aren't any blueprints or profile drawings of this airplane, only black & white photos, so we decided to leave undrawn.

The only known pic of the Macchi M.6

Sources:
1. Salamander Books - The Complete Book of Fighters
2. https://en.wikipedia.org/wiki/Macchi_M.6