All entries for Monday 03 January 2005
January 03, 2005
Another good day for circuits. Good visibility with cloudbase well above circuit level. With a wind strength of 13 kts anddirection 240 deg, there was only a small crosswind component ~ 2 kts.
Did 4 circuits in all – very pleased with landings and my approach to runway was much better. Got the climbing and descending nailed at 70kts. Also did the radio myself this time.
However I have developed a tendancy to climb during the downwind leg. I think this is due to the fact that I have not trimming correctly. During the take off climb I am trimming too much nose up and then after levelling out on crosswind leg not correcting the trim enough. Hence trim still set for nose up and therefore I drift upwards. (Tip: very rarely need more than 1 turn of wheel in either direction)
Cessna 152 has maximun crosswind component of 12 kts. Before taking off I need to ensure that the crosswind component of the wind is less than 12kts
Calculation- The Sixths Rules of Thumb
First calculate angle between runway and wind direction . Taking lesson 14 as example wind direction 270 deg runway is 230 deg – therefore angle = 40 deg
then apply rule
if angle = 10 deg then crosswind component = 1/6 wind strength
if angle = 20 deg then crosswind component = 1/3 wind strength
if angle = 30 deg then crosswind component = 1/2 wind strength
if angle = 40 deg then crosswind component = 2/3 wind strength
if angle = 50 deg then crosswind component = 5/6 wind strength
if angle = 60+ deg then crosswind componnet = wind strength
So at 40 deg and 17 kts wind strength – crosswind component = ~ 12kts