Shaft Diameter Calcs Wyman-pwd_111573133.pdf

D Minimum 164.6563 mm 6.48252 in *Tail Shaft Diameter*

Material UTS

INPUT 125000 psi 861.845 Mpa

Vessel Length

INPUT 123.7 ft 37.7 m

Engine Rating

R INPUT 1800 rpm 229.6504 srpm

H INPUT 1300 bph 969.8 KW

Gear Ratio

INPUT 7.838

Select C1 540 Vessels 20m and over but below 45.7m with all other material or unprotected Grade 2 material

C2 160

Shaft Design Factor

K 1.26 4-3-1 Table 1 and Table 2, D Minimum 6.483718 in

P INPUT 1300 bhp

N INPUT 229.6504 srpm

St Input 60000 psi tortional yeild strength

S.F 9

Shaft Diameter Calculations NOAAS FERDINAND R. HASSLER (S-250) Using AQUAMET 22 HS

Prepared by Sandra J. Wyman, PE

IAW ABS Steel Vessel Rules Under 90m in Length 2018 Part 4 Ch 3 Section 1-7

Tortional Stress Considerations

S e e A

B S H o u s to n L e tt e r R e f T D a te d

-M

A R

-2

Vessels 20m and over but below 45.7m with all other material or unprotected Grade 2 material

S e e A

B S H o u s to n L e tt e r R e f T D a te d

-M

A R

-2