we have seen cannot be maintained between ship and propeller. So, how do you
maintain the kinematic similarity between ship and propeller in this case? See, this is the
problem, if we do not maintain kinematic similarity then our results are likely to be
erroneous and cannot be extrapolate to full scale. At the same time we cannot maintain
Reynolds similarity. Fortunately, for us propeller is mainly a pressure based device, that
is pressure on the case and pressure on the back the difference of that gives us the lift
force. Lift force is not dependent on Reynolds number, whereas, drag is, but in propellers
drag is relatively low less