lled to detennine lihe direction and velocity of the of 1931. flow at any poiut around an airplane. Aircraft engine DESCKIPTION OF TUNNEL cooling and cowling problems can also be investigated The general arrangement of the timnel is shoAvn in under conditions similar to those in flight. figure 1… … D. 35'6/g' Plan C Control 0 10 SO 30 40 50 60 TO 80 SO iCO A. Airlock reel Longiludinal section FiGTntE 1.—^Plan and elevatlan of the tunnel. type with an open throat having a horizontal dimension constructed with an eUiptic throat and with two propel- of 60 feet and a vertical dimension of 30…
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