I realize that you posted in the half A section, but depending on exactly what you plan for your Platters, they can be scaled up somewhat. I have one that is 24 inches in diameter, powered with a Fox 19. It does pretty well, lazy eights, inverted, loops, and isn't too fast. Flying on 52 foot lines, you need to put some kind of rudder on it, or you won't be able to see the thing. Mine has bounced pretty hard more than once without damage. I wouldn't go more than 24 inch because the corroplast gets floppy.