is usually in the range 0.95 to 1.0 but can be as low as 0.7
A long time ago, now .. but I recall that lumbering Queen of the Skies, the AW650, had a recovery factor about 0.55. Good, solid, British stuff, you know..... ah, the sound of four dogwhistles overhead in close formation at 0-dark-thirty in the morning when one had just nodded off to sleep ...