Hoar Frost?
Hi Guys,
I am doing my CPL Meteorology exam in 2 days time and one particular question (that I now remember I got wrong in the PPL theory exam). In the text book that I am using it specifically says " Hoar Frost has very little effect on aircraft performance". At the end of the same book in the practice exam it gives the answer as it being " Hazardous to aircraft performance as it increases the stall speed". Now I know in general that Frost is detrimental to performance - i am just confused because this text book contradicts itself!!!
It says Hoar Frost forms as white crystalline deposits when a cold soaked aircraft descends in to warmer, more humid air (dpeosition occurs) and that it can also happen on a calm, clear night with a high relative humidity. SO what do you reckon - a silly mistake by the books publisher and that Hoar Frost is indeed detrimental to aircraft performance (getting it wrong in the PPL test confirms this for me)?
Cheers guys,
Opso