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December 4 2017 at 4:23 PM
Miles  (Login Miles_M)
YF12


Response to Factors at play

someone correctly refering to a diabolo as flare stabilised, which is correct, as opposed to drag stabilised, which it isn't.
As for twist rates and speeds, my calculations suggest that as a diabolo pellet's speed gets near to the speed of sound the aerodynamic stability decreases at a fairly high rate until it becomes aerodynamically unstable around Mach 1. As a result the twist rate needed for stability will increase as the speed approaches Mach 1. Below about 850-900 ft/sec the aerodynamic stability seems to remain fairly constant and needs much less spin.

 
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