Not built specifically for this challenge; a maritime patrol/search & destroy plane based on the Fw-191 "schnellbomber". It's equipped with two Henschel Hs-295 missiles, two Fritz-X bombs and a pair of standard torpedo's.

Approach the ships from a decent altitude of a few km. From approx. 14 km distance, you can use the Henschel 295's; these should take care of at least one, perhaps two of the ships. But beware; these things aren't lighting-fast, so your plane will be flying through quite a bit of flak (not too accurate at that distance) before they hit.
To use the Fritz-X, you will have to get a lot closer... minimum 5 km. If you manage to evade the flak, the Fritz-es will end the game for the ships. Should there be one ship left and you're lucky enough to still be flying; open the bomb hatch and use a torpedo as a last resort.

I tried it, and it works -but I had to limp to Avalanche airport with one engine burning

When taking off from Yeager airport, best use the RATO pods; the plane can take off without them, but it's more comfortable that way.

Controls;

• AG1 : activate RATO-units (you get a 30-second burn time for takeoff)
• AG2 : control the MG & cannon turrets with the VTOL and Trim sliders
• AG3 : open internal bomb (or in this case, torpedo) bay
• AG4 : engine smore effect... but beware, this uses up your fuel.
• AG5 : drop the Fritz-X bombs without launching, if you don't need them
• AG6 : drop the Hs-295's without launching, if you don't need them
• AG7 : navigation lights

As standard, the VTOL and Trim sliders are flaps & trim respectively. AG2 will allow you to control the MG/cannon turrets with the VTOL and trim sliders; with AG2 activated, flaps & trim control is unavailable and the gyro is activated to keep the plane steady during the fight. Not the best way to control these turrets, unless you’re using a game controller. Feel free to assign other controls (e.g. yaw/pitch) for turret control.