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I'm trying to figure out the diameter of tri-blade propellers.

I found a 7x3x4.5 blade, I'm trying to understand the measurements. Is the '7' the length of the blade giving the prop a 10.5" diameter? or is the 7 the total diameter?

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7 is diameter of propeller in inches and 4.5 is pitch of propeller in inches.

Unless mentioned, propeller parameters are mentioned in inches. The Pitch of a propeller is distance covered by the propeller in one full rotation hence measured in inches. This is similar to pitch of a screw.

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    $\begingroup$ perhaps the 3 means it is a 3 bladed prop. $\endgroup$ – BeowulfNode42 Feb 14 '14 at 5:13

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