Slight thread creep apologies but it is pertinent to a 172.
When i did my training in Florida many years ago the examiner on a checkride told me that you could set a specific power (RPM with the fixed pitch prop) and with each 10 deg of flap the IAS would drop 10 kts, and if you timed it right you could fly around the circuit from join all the way to the landing without touching the throttle. Something like that anyway. Anyone know what i'm talking about?