Recall that a year or 2 ago on this forum we debated ad nauseum the HP required to increase speed from X to 2X (for some given object, maybe a motorcycle?), which revealed that HP must increase by the cube of the change in speed. For this discussion a plot was created using this cubed relationship and a starting datum value of 47 HP = 117 mph. Why was the 47 HP = 117 mph datum chosen? Because this puts the 45-50 HP range in the 115-120 mph ballpark which various people and articles suggest might be the correct ballpark. If the relationship is extrapolated to much higher speeds (150-160 mph), the HP numbers remain in the reasonable ballpark and do not get really crazy. I’m sure some of the LSR people here could weigh-in and indicate whether the plot has some basis in reality, keeping in mind that any given dyno number might be + 5-10% of reality.