Page 237 - Introduction to Naval Architecture
P. 237
222 PROPULSION
velocities, the flow is along OD. The lift and drag forces on the blade
element, area dA, shown will be:
The contributions of these elemental forces to the thrust, T, on the
blade follows as:
Mr
dr = i pC _ : —1_ Mr
" - 2 4 o
sin <f> cos p
The total thrust acting is obtained by integrating this expression from
the hub to the tip of the blade. In a similar way, the transverse force
acting on the blade element is given by:
Continuing as before, substituting for Vi and multiplying by r to give
torque:
