At minute 9:45 in the video, he does the math for the DMMS of a DC3. He says that the dirty minimum air speed for the DC3 is 64 kts and the clean minimum air speed is 68 kts. Then he comes up with the calculation of 68 kts x 1.404 = 89.9 which seems to be incorrect. He seems to actually be using the dirty stall speed of 64 kts x 1.404 = 89.9. 68 x 1.404 is actually = 95.0. Am I getting this wrong? My math ability doesn't go much beyond 1 + 1 = 3.
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