MadRocketScientist
Well-Known Member
I have the opportunity to increase the pitch circle diameter that the prop bolts on my engines for my CriCri as I am making new prop hubs to suit the starter ring gear and spinner mounts. The bolts are currently on a 46mm diameter circle on the ZDZ210 engines but some of the other engines around use a larger diameters. The original JPX 15hp prop bolts are on a 54mm circle and the Limbach 275 uses a 50mm circle.
I understand that the bolts aren't loaded in shear and that the prop is driven by the friction between it and the back-plate.
Is there any advantage to a larger diameter given that the bolts are only loaded in tension anyhow?
I understand that the bolts aren't loaded in shear and that the prop is driven by the friction between it and the back-plate.
Is there any advantage to a larger diameter given that the bolts are only loaded in tension anyhow?
