Prop block calculators

Propeller block calculators

The following calculators are useful when carving a propeller using the style of block illustrated above. Enter the values in the shaded boxes. The other values will update as soon as you click in a new box or press the button. The calculators work for either English or metric values. Fractional equivalents (to the nearest 1/32nd) are computed for convenience.

The calculators also compute the shoulder radius percentage, pitch:diameter ratio and maximum blade chord. These may be useful when designing your own propellers.

Dimension an existing block

Radius
Pitch
Width
Height

Shoulder radius
Tip thickness
Shoulder radius %
Max blade Chord
P:D

Use this calculator when you have a block of wood that's already pretty close to the size you need. Simply enter that block's dimensions and the desired pitch.

Dimension a custom-sized block

Radius

Pitch

Width Height

Shoulder radius

Tip thickness

Shoulder radius %

Max blade chord

P:D

Use this calculator when you'd like the shoulder to be located at a particular point on the blade radius. Or, for an X-block, set the shoulder radius equal to the radius.

Find the pitch of a specified X-block

Radius

Width

Height

Pitch

P:D

Use this calculator to figure out what pitch a given X-block will yield.

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