The tests were made on th-scale model nacelles fitted on a 20 per cent, thick wing spanning the Royal Aircraft EstabUshment No. 1, ll1/2-ft. Wind Tunnel. The exhaust flow was represented by compressed air fed into the model through the end of the wing. The propeller was driven by a 6 h.p. electric motor mounted in the model. A range of nine positions of the power plant was available, three fore-and-aft positions to each of three rear nacelles giving different up-and-down positions.nThe results show that at high CL the best of the positions tested for the exhausts is some 5 per cent, chord above the wing chord line. In this position there is a loss of about 20 per cent, of the exhaust thrust.
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