Energy Maneuverability

[MadBlaster]

Originally Posted by IvanK

Nothing to do with G Suits in this chart. The red and Blue convex lines merely represent the sustained G that each aircraft can pull without energy loss i.e. Ps=0. The Red line represents the Mig15 sustained turn boundary, The Blue line the F86F (doesnt say hard or slatted wing) sustained turn boundary. The left hand marhin is the Lift limit, the top the structural limit, the RHS the Vmax limit.

This chart is pretty historical as it was one of Boyds first comparative EM charts. It is my belief that this chart was in fact based totally on calculation. Its origin is I believe from a presentation Vu graph used by Boyd in one of his early presentations. The original graph was taken from Boyds archival papers. I recall its covered in the book "Boyd the fighter pilot that changed history" by Coram.

ah well thanks for clarification. it seems coincidence though. wiki says gloc occurs around 5 g for average human. so to get to those outer performance curves, you would need a g suit.

so, i wonder if the lower curves maybe are just normal operating curves and the outer ones, performance curves under combat condition, or something like that?