You would probably have to make mods to the transom to mount then on,depending on the size of the the mounts on the outboard.
From what iv read the graupner units only have a 3.2 mm flexi so you wouldnt be able to run any decent motors and prop size,i would look at the bullet drive units or the OS lower units.
Yes you would need to counter rotating props
Hope this helps bud,look forward to build thread keep us posted
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