Originally Posted by
djpil
The manual for my FAR 23 factory built airplane specifies 1.07 times the power off stall speed for landing approach to achieve the book figure for landing distance.
And, being a tailwheel airplane, CASA's Part 61 mandates that for training as well as requiring the student to achieve better than the distance from the book.
1.07 isn't that much of a buffer however in perfect conditions it might be ok.
From memory the CASA display guidelines specify 1.3x but it's been quite a while since I've done one.