An Evaluation of Proposed Reference Fuel Scales for Knock Rating


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This paper presents the results showing the antiknock performance characteristics of proposed reference fuels (triptane, n-heptane, isooctane) in current fuel knock-rating engines. The proposed reference-fuel scales are compared with the octane-number scale and the performance-number scale now in use.




Technical Note


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Characteristics of Thin Triangular Wings with Triangular-tip Control Surfaces at Supersonic Speeds with Mach Lines Behind the Leading Edge


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A theoretical analysis, based on the linearized equation for supersonic flow, of characteristics of triangular-tip control surfaces on thin triangular wings. By restriction to case for which Mach lines from wing apex lie behind the leading edge, a simplified treatment was possible; results of previous work on lift of triangular wings could be used to derive expressions for lift effectiveness, pitching moment, rolling-moment effectiveness, hinge moment due to control deflection, and hinge moment due to angle of attack. Comparisons were made with two-dimensional case.




Index of NACA Technical Publications


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