I was skiing this last weekend and got into a conversation regarding why it felt like such a struggle (probably just an off day). Somehow we ended up on water temperature and viscosity. So... I looked it up. At 90F the dynamic viscosity of water is roughly 0.8*10^-3 Pa*s. At 60F it is roughly 1.15*10^-3 Pa*s. That's a 44% increase in dynamic viscosity! I am in no way an aerospace engineer, so I can make really bold statements and clam full ignorance. What does this increase in viscosity do for the force of drag???
The easiest theory I can find (and here is my ignorance) is the Stokes' equation for spheres traveling in a fluid where Drag Force = 6 * pi * mu * R * V. Where, mu is the fluids dynamic viscosity, R is the radius of the sphere, and V is the velocity. Using the Stokes' equation, a 44% increase in dynamic viscosity equates to a 44% increase in the Drag Force!! That all assumes pure laminar flow, small Reynolds number, and so forth (which I'm sure is a gross oversimplification).
Any aero/hydro guys/girls out there that can provide some better insight? For now I'm thinking of changing my wing from an 8 deg to a 5 deg until Spring gets here.