Hurricane Speed Test in game

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Find Pressure ratio,

Delta at sea level is 29.29”/ 29.92” = .978944

Find Temperature Ratio,

19C =66.2 F

Theta = T/To at sea level , where T = Actual Temperature in deg K or Deg R and To = Standard sea level Temperature in deg R or deg R.
At altitude Theta = (66.2F + 460R)/(59F + 460R) = 1.01387

Find Density ratio,

Sigma = Delta / Theta = .965552

Find Standard Means Of Evaluation:

SMOE = 1/SQRT(sigma) = 1.01768

Hurricane Mk I sea level TAS @ standard conditions = 263mph TAS = 263mphEAS

Under game atmospheric conditions with a standard lapse rate:
263mphEAS * 1.01768 = 268mphTAS @ Game Sea Level

The Hurricane Mk I should be in the vicinity of 268mphTAS at sea level in the game under the atmospheric conditions recorded.