LST
I have the book and was intrigued by exactly those questions that you posed. I re-read them to check and I am still confused.
Dutch Roll- Isnt this due to the 'differential' (my own terminology used there) lift between the wing moving forward with an increased AoA therefore higher lift coefficient and the rearward moving wing having a reduced lift coefficient due to reduced AoA. If the rearward moving wing is indeed stalled, I am sure they are going to get more than a bit of dutch roll to contend with. I certainly have never been taught that the rearward travelling wing is stalled. Maybe he means in 'relative' terms and i use that term extremely loosely.
Engine Failures - If my memory serves me right. When I get hit by a crosswind, the nose of my aeroplane will swing into wind. This is due to the force acting on the tail. IE a left hand wind means swinging left and vice versa.
Quote, page 60:
"... a failed critical number 1 engine will cause a yaw to the left"
Correct.
" A crosswind component from the left will apply a restoring force to the aircrafts fuselage, whereas a crosswind from the right will aggravate the yawing moment further to the left due to the sideways force experienced on the right side of the aircrafts fuselage"
How does that work?
It doesnt matter if the critical engine is the number one or two (if there is a critical engine). If the number one fails, it will swing left, number two fails, a/c swings right. More or less depending on having a critical engine or not. As for the a/c swinging right with a left crosswind and left with a right crosswind? In what type of a/c does this happen. One with a tail in front of the C.o.G. maybe? Or maybe an a/c that has an engine failure while travelling in reverse? Sorry, bad joke.
Seriously, why is there mention of this force on the fuse and not on the tail.
Edited: Just read ali1's post. On the ground and in the air are a different matters. I agree with you totally although it is unclear what the book is talking about. I am talking about before you get airborne.
Dusty B
The 'molecules' that travel 'above the wing' do have to travel further. Look at a cross section of an aerofoil. How is that wrong, please explain what you mean.
Edited: This book while not perfect is a fairly good way of refreshing your ATPL information. I wouldnt write it off completely.
Last edited by On speed on profile; 6th February 2006 at 15:53.