Section 2 Plans and particulars

2.1.1 At least three copies of the following plans and information are to be submitted:

2.2.1 A plan of the propeller, together with the following particulars is to be submitted:

1. Maximum blade thickness of the expanded cylindrical section considered, in mm, excluding any allowance for fillet, T, in mm.

2. Maximum shaft power, P, in kW, see Pt 9 General Requirements for Machinery.

3. Estimated craft speed at design loaded draught in the free running condition at maximum shaft power and corresponding revolutions per minute (see Pt 12, Ch 1, 2.2 Plans 2.2.1.(b) and Pt 12, Ch 1, 2.2 Plans 2.2.1.(d).

4. Revolutions per minute of the propeller at maximum power, R.

5. Propeller diameter, D, in metres.

6. Pitch at 25 per cent radius (for solid propellers only), P _0,25, in metres.

7. Pitch at 35 per cent radius (for controllable pitch propellers only), P _0,35, in metres.

8. Pitch at 60 per cent radius, P _0,6, in metres.

9. Pitch at 70 per cent radius, P _0,7, in metres.

10. Length of blade section of the expanded cylindrical section at 25 per cent radius (for solid propellers only), L _0,25, in mm.

11. Length of blade section of the expanded cylindrical section at 35 per cent radius (for controllable pitch propellers only), L _0,35, in mm.

12. Length of blade section of the expanding cylindrical section at 60 per cent radius, L _0,6, in mm.

13. Rake at blade tip measured at shaft axis (backward rake positive, forward rake negative), A, in mm.

14. Number of blades, N.

15. Developed area ratio, B.

16. Material: type and specified minimum tensile strength.

17. Skew angle, θ_s, in degrees, see Figure 1.1.1 Definition of skew angle.

18. Connection of propeller to shaft- details of fit, push up and securing.

19. Keyed connection details.

20. Details of control/hydraulic system and pressures for CP Propellers actuating mechanisms.

21. Inertia of propeller assembly, kgm².

22. Total mass of propeller assembly, kg.

2.2.2 For propellers having a skew angle equal or greater than 50^o in addition to the particulars detailed in Pt 12, Ch 1, 2.2 Plans 2.2.1 details are to be submitted of:

1. Full blade section details at each radial station defined for manufacture.

2. A detailed blade stress computation supported by the following hydrodynamic data for the ahead mean wake condition and when absorbing full power:

   1. Radial distribution of lift and drag coefficients, section inflow velocities and hydrodynamic pitch angles.

   2. Section pressure distributions calculated by either an advised viscid or viscous procedure.

2.3.1 In cases where the craft has been the subject of model wake field tests a copy of the results is to be submitted.

2.3.2 The following information is to be submitted as applicable:

• For controllable pitch propellers plans (in diagrammatic form) of the hydraulic systems together with pipe material and working pressures.
• Details of control engineering aspects in accordance with Pt 16 Control and Electrical Engineering.
• Calculations, or relevant documentation indicating the suitability of all components for short term high power operation.
• Where undertaken, fatigue strength analysis of components indicating a factor of safety of 1,5 at the design loads.
• For cases where the propeller material is not specified in Table 1.3.1 Materials for propellers, details of the chemical composition, mechanical properties and density are to be provided, together with results of fatigue tests in sea water in order to assign a value for U.