try landing at cockatoo island, 500m strip and you gotto launch of the third humpty do....
Short field is awesome fun, nice flat approach using full flap and lots of power to keep the AS on the nail, and you never need 40 in a 150, 30 is more than enough, i flew a 150 aerobat with 40 of flap and it was a complete waste of time.
If you have a long enough strip, short field prac is awesome for stop n go's