Why still no dive acceleration difference?

[BlackBerry]

Originally Posted by Crumpp

Not in the envelope of the aircraft. It is a CSP.

CSP could maintain constant efficiency roughly when speed of propeller tip is below 0.85. Please check 3-blades efficiency curve, when advance ratio is far greater than 2.2, namely when prop tip is approaching 1 Mach, the story changes. A CSP will lose efficiency inevitably at high speed diving(a/c noise louder and louder).

Btw, CSP will also lose efficiency when TAS is very very low.