The flaps 30 Calibrated speed at an indicated 55 is 57 kts. For example ( C172 P ) flaps up 50 kt IAS is 56 Calibrated, so at the low range you will being going faster than the number on the ASI. First for the C 172 Indicated Airspeed is always equal to or lower than Calibrated Airspeed. For a student I would use this as a basis and brief them on the possibility of adjusting this speed based on loading. In my experience using 65kt with flaps 30 works on the various 172s that I've flown, with the odd adjustment to 70 in case of severe gusts. It can be done, but expect to end up at the low (unreliable) end of the ASI. Using 1.3xVstall is not very handy in a Cessna as the stall speed will be so low that you end up creeping towards the threshold with barely any margin in case of gusts. Long floats caused by excessive threshold speed are to be avoided as they can lead to a bounced touch-down caused by a pilot trying to 'spike' the aircraft nose-wheel first on to the runway and the potential for nose-wheel collapse. Bit different on the Boeing 737 where the difference is around 50 knots. Also note with the C172N there is only five knots difference in the landing speeds between 40 degrees of flap and flaps up. That is the equivalent of the tables marked 'Short Field' in the C172 manufacturer's Information Manual. With airliners the performance charts give you landing distance required and the airspeed at 50 feet. And 55 knots is less than the 'short field' of 59 knots so try and make sense of that.ĥ9 knots over the fence with full flap is safe as houses and although associated with the terminology 'short field', is the airspeed you should use for everyday landings. A 'normal landing approach' with Flaps at 40 degrees gives you a range of speeds 55 knots to 65 knots. That is power on or power at idle for the final approach.

That is ample speed and will give you a comfortable float before touch down. The Cessna Information Manual 1980 for Model 172N gives 59 knots at 50 feet for landing. The tables give you ground roll and total to clear a 50 feet obstacle on approach.

172p v speeds