12:27 May 26, 2009 

For some strange reason, the ne wasn't subscripted in the German original, but I was sure it needed to be. This is for a general (non-technical) target readership though, as it is for a museum website, so lay text is probably wiser than too much technical jargon.

12:21 May 26, 2009 

David, you have a Kurvenlastvielfaches (g-load) of 4 to 5 G's when you start to enter a loop (a vertical curve), without any bank at all, just positive and negative pitch.
Banking is far away from being the correct answer. You can bank the aircraft unloaded, which is referred to as rolling.
And yes, V sub ne is a standard variable as V sub c ,etc. ne standing for never exceed. (Jesus!)
We are talking about engine, speed and G limitations here, which have direct impact on the aircraft's display performance.

12:21 May 26, 2009 

The term doesn't just involve banking, but curved flight generally. If you need a less specific term, then I would use g-loads as already suggested. "ne" should be suscripted and means "never exceed speed". This seems so suggest that a technical rather than lay text is required.