Quetions from Davies "Handling the Big Jets"
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Quetions from Davies "Handling the Big Jets"
I'm a Yank reading this book, and have some questions.
First of all, the term "Incidence" is repeatedly used in what I would guess is what we Yanks call "Angle of Attack". Is that correct? Our "angle of incidence" is the angle between the longitudinal axis and the chord. Just want to clear this one up so I have the phraseology correct.
Another question I have is regarding Vmo and Vdf. Davies talks about a "published crew-training" number between these two values on page 88, Paragraph C:
"As an acknowledgement of the fact that handling qualities can change above Mmo due to high Mach number effects a crew-training Mmo (and Vmo where necessary) has been established and is quoted in Flight Manuals. This is the indicated Mach value of the true Mach number which is halfway between Mmo and Mdf."
If I understand this correctly, crews somewhow disable the overspeed (in the sim, I'm assuming) and practice some sort of jet-upset halfway between Mmo and Mdf? Just curious, I've never done this or heard of it (any flight above the barber pole in sim or plane).
Maybe someone could elaborate.
First of all, the term "Incidence" is repeatedly used in what I would guess is what we Yanks call "Angle of Attack". Is that correct? Our "angle of incidence" is the angle between the longitudinal axis and the chord. Just want to clear this one up so I have the phraseology correct.
Another question I have is regarding Vmo and Vdf. Davies talks about a "published crew-training" number between these two values on page 88, Paragraph C:
"As an acknowledgement of the fact that handling qualities can change above Mmo due to high Mach number effects a crew-training Mmo (and Vmo where necessary) has been established and is quoted in Flight Manuals. This is the indicated Mach value of the true Mach number which is halfway between Mmo and Mdf."
If I understand this correctly, crews somewhow disable the overspeed (in the sim, I'm assuming) and practice some sort of jet-upset halfway between Mmo and Mdf? Just curious, I've never done this or heard of it (any flight above the barber pole in sim or plane).
Maybe someone could elaborate.
Join Date: May 2005
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Hey, Goose.
You are right on the first one - "Incidence" here is the Angle of Attack, which is sometimes referred to as "Aerodynamic Incidenece", mostly in the older English publications. These days they have taken to calling it Angle of Attack, just like in the US. The angle between the longitudinal axis and the chord line is the good old Angle of Incidence now, just like you said, so no worries there.
Not sure about the second question - I haven't come across anything like that in training either. My guess is that it must be some kind of procedure from the old days, when they utilized the actual aircraft a lot more for crew training, and such speed - the crew training Mmo - was published. Also, it could only apply to some particular type of an older jet, Davies makes a lot of disclamers like that throughout the book.
Hope it helps.
Spektor.
P.S. When is the Interview? Mine is July 1st, NYC.
You are right on the first one - "Incidence" here is the Angle of Attack, which is sometimes referred to as "Aerodynamic Incidenece", mostly in the older English publications. These days they have taken to calling it Angle of Attack, just like in the US. The angle between the longitudinal axis and the chord line is the good old Angle of Incidence now, just like you said, so no worries there.
Not sure about the second question - I haven't come across anything like that in training either. My guess is that it must be some kind of procedure from the old days, when they utilized the actual aircraft a lot more for crew training, and such speed - the crew training Mmo - was published. Also, it could only apply to some particular type of an older jet, Davies makes a lot of disclamers like that throughout the book.
Hope it helps.
Spektor.
P.S. When is the Interview? Mine is July 1st, NYC.
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Good luck guys! It's all just a hoop-jumping excercise.
"What is the band/frequency of the WX radar?"
ISYN!
