Propeller Sizing (System Parameters)

Wageningen B-series open-water prediction and first-cut diameter/pitch design

Vessel & loading

Loading input

Ship speed

Total resistance RT

Block CB

—

Prismatic CP

—

Enter RT and V, or thrust directly. Tip: run Resistance first and import its JSON here.

Propeller configuration

Wageningen B-series family

Blades Z

—

Area ratio Ae/A0

—

Shaft speed

rpm

Max allowable diameter (0 = unlimited)

Shaft immersion hI

B-series valid for Z = 2–7, Ae/A0 = 0.30–1.05, P/D = 0.50–1.40.

Hull–propeller interaction

Interaction model

Wake fraction w

—

Thrust deduction t

—

Rel. rotative ηR

—

Open-water efficiency ηO

—

Propeller design result

Hull–propeller interaction models

Wake fraction w and thrust deduction t vs block coefficient for each interaction model; relative rotative ηR and hull efficiency ηH are compared at the current CB/CP.

Wake fraction w(CB)

Thrust deduction t(CB)

Open-water curves (B-series)

Open-water family — multiple P/D

Efficiency ηO vs advance ratio at several pitch ratios for the selected family; the design P/D is highlighted.

Cavitation check

Cavitation margin diagram

Operating point vs the Burrill critical line τc = 0.28·σ (safe below, risk above).

Blade strength check

Bending stress at 0.25R from a cantilever-blade model; safety margin vs the allowable stress.

Allowable stress σ_allow

Dynamic/design factor

—

• Diameter may be limited by draft and tip clearance (15–25% of D recommended).
• B-series polynomial source: Oosterveld & van Oossanen (1975).
• This module sizes the propeller within the propulsion system. For detailed blade geometry, cavitation and strength, use a dedicated propeller-design package.