Wow thats a huge prop!,,, from what I figure 65mm = 2.56",,, I saw metal Dumas props at Tower Hobbies, but the biggest I see are 2 inch,,, and you would hafta carefully drill out the hole for the shaft from 3/16" to 5mm. By the way, do you know what rotation you are gonna use?,,, from looking at the prop, clockwise or anticlockwise?,,, We've gotta check other Scale boat sites