Comparing Mosquito Biv cfg and air files with the Mosuito NFII, XII, and XIII

[mongoose]

Checking these with chatGPT's help, it would indicated worse performance with the NFs than the Biv,For instance critical altitude for the Biv is 17000ft but the NFs is 13900ft even though Biv 1230hp against NFXiII etc with 1280hp. The suggestion is to use the Biv cfg and air file for now unless a modeller wants to change them at some time or other.