IT is rather difficult at this time to ascertain whether or not all the problems with which we are confronted in laying out “sub‐merged” engine installations are real or imaginary. We must contemplate the problems that we think exist and attempt solutions based mostly on our own past experience. Very few submerged engine installations have been designed, ground tested, or flown; therefore, actual experience is woefully lacking. The problems which we have encountered have been met while making preliminary designs of several types of advanced aircraft.
Beall, W.E. and Emery, E.G. (1940), "“Submerged” Engine Installations: An Examination of some of the Difficulties to be Surmounted in Design and Installation", Aircraft Engineering and Aerospace Technology, Vol. 12 No. 4, pp. 106-108. https://doi.org/10.1108/eb030630
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