Model of a Two-Blade Parabolic Propeller, Petrus van der Loo (attributed to), c. 1847 Canvas Print
Model of a two-bladed parabolic screw in a frame on a base board. The printing surface of the screw blades is curved in the form of a parabola. The screw can be rotated with a crank. The model has a pitch of 286 mm, a diameter of 200 mm, the hub is 75 mm long and has a diameter of 26 mm. Scale 1:10 (derived).
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