The Range Safety Craft went well with 2 x 550 motors on scale props.
A 550 on 12 volts or graupner equivalent should have her going fine.
The Range Safety Craft is a semi-displacement hull so will lift the bow up but takes lots of power.
Possibly a 600 Speed or even a 600BB Turbo, but depends on how much you want to spend on ESC and duration.
Bob