Typos about how-to-rocket HOT 2 OPEN

In original form, equation 46 is missing c_p. The equation should be:
w_w = Q/(c_p*dT)

or in LaTeX;

w_w = \frac{Q}{c_p\Delta T}

from how-to-rocket.

Equation 63 should be a continuum of the above equation, and be replaced with a new equation: "...diameter of each hole is D = (0.00558)^(1/2) = 0,0747 in".

from how-to-rocket.