All entries for January 2005
January 25, 2005
Todays lesson was a “formal” session on crosswind circuits. I have had a go at crosswinds circuits before (lesson 14) with mixed success.
In addition to notes from lesson ? when doing a touch and go – after landing the ailerons should immediately be turned into wind
well that’s the theory
I must admit I felt reasonably proud of myself today. There was a lot going on but a managed to I hold it all together. For a start its a lot different doing right hand circuits – the view of the runway (or lack of it) is completely different. Also you do get used to the familiar landmarks – (I felt lost without my familiar chimmney on the crosswind leg to aim for) My landing were reasonably good although I was relying on the instructor a bit too talk me down – ie left to my own judgement I proabably would have flared a little too early. But no bad landing and approach was much better. (Also managed to keep height steady on circuits)
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