Aeroplane Mass Ratio - Gust Envelope
 

Dear fellow PPRuNers,

Would someone be able to give me a leg up regarding the aeroplane mass ratio μ in CS 25.335 (d)(1) (see below)?
I fully understand that the gust load factor is based on a notional sharp-edged gust, and therefore needs correction for a more realistically shaped gust and load alleviation from the tailplane. Unfortunately, I can't get my head around the rationale behind μ, and the textbooks usually just mention K_g without further explanation.

Any hint would be greatly appreciated.

This may help https://apps.dtic.mil/dtic/tr/fulltext/u2/a380634.pdf
NACA TECHNICAL NOTE 1976 SUMMARY OF INFORMATION RELATING TO GUST LOADS ON AIRPLANES

Thank you for the link.
Saved on my phone for a future brain aneurysm.
:8

Many thanks, David.

For future reference, the gust alleviation factor in its current form was suggested by

Pratt, NACA Technical Note 2964, Washington, June 1953.