To the Editor, DEAR SIR, In a letter, which has just come to my notice, published in your October 1951 issue, Mr A. V. Cleaver advocates the use of sub‐orbital refuelling techniques as a means of rendering interplanetary flight an economic proposition, and suggests that the importance of this factor was underestimated in the above paper which was reprinted in your August issue.
Thompson, L.N. (1951), "Letters to the Editor: A Reply by the Author to Mr Cleaver of the British Interplanetary Society— Further Correspondence on Flow through Convergent‐Divergent Nozzles", Aircraft Engineering and Aerospace Technology, Vol. 23 No. 12, pp. 378-378. https://doi.org/10.1108/eb032115
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