Ignition Overide, thanks for your enditement upon why not to rely upon the the little 'dot of snot', but would you care to enlighten us into your method of descent??
All the best!
Ha ha. Only kiddin me old mucka!
Your double and add 10- 20 would leave you high in most modern jets I believe? With it being more of a case of treble it and add 10.
I stand to be corrected though!!