turbine transition questions

J

jon wilson

Pilot4Life
I'm going to apply at Seaport airlines and I was wanting to know of any good books to start reviewing on knowledge of the aircraft that they fly. Any good turbine books out there. Thanks for the input.
 
jon wilson said:
I'm going to apply at Seaport airlines and I was wanting to know of any good books to start reviewing on knowledge of the aircraft that they fly. Any good turbine books out there. Thanks for the input.
Click to expand...

http://www.asa2fly.com/The-Turbine-Pilots-Flight-Manual-P1798.aspx

That's a decent book to start with, whether you are new to turboprops or turbofans/jets.

Another resource I like is "Everything Explained for the Professional Pilot" for general knowledge of rules and regs. http://aviation-press.com/

Also, prepare for boredom as @Roger Roger said.
 
If you're flying multi crew in the Caravan may I suggest a good series by the same author. I'm a John Grisham kind of guy.

Everything explained for the professional pilot is a very good read.
 
Many worthwhile books out there that offer outstanding information about gas-turbine engines if you wish to understand them in depth:

http://www.amazon.com/Jeppesen-Aircraft-Turbine-Powerplants-Workbook/dp/B003Y7NF3K

This one here is a very informative one. Somewhat pricy, but certainly worth it. There is a whole section about the PT6 in there. The Airplane Flying Handbook also refers to the PT6 inside of the Transition to Turboprops section.
 
I am trying to understand coffins corner, I have an interview coming up. My understating is, is the point where the Mach buffet and stall buffet converge, or just below it, this is the coffins corner. This happens due to increasing altitudes increases the stall speed due to less dense air and also as we increase in altitude the Mach number decreases, so when these two converge it could be a bad scenario. Is this correct ? Anything I am missing
 
Jose duran said:
I am trying to understand coffins corner, I have an interview coming up. My understating is, is the point where the Mach buffet and stall buffet converge, or just below it, this is the coffins corner. This happens due to increasing altitudes increases the stall speed due to less dense air and also as we increase in altitude the Mach number decreases, so when these two converge it could be a bad scenario. Is this correct ? Anything I am missing
Click to expand...

Mach number doesn't decrease but your maximum indicated airspeed decreases and mach number increases.

Now I'm not the smartest guy so hopefully someone else here will have more to add or just state that I am wrong and personally insult me :)

Think about it this way. The air is less dense so the indicated airspeed of a stall is increasing. Think of that as your bottom line. Meanwhile the max indicated airspeed is also decreasing because the mach number is increasing.

Also you may get bonus points for stating that "coffin corner" isn't really a corner anymore. A modern business jet has over 100 knots of speed to play with generally at a reasonable operating altitude. Modern efficient wings have all but eliminated this issue, but it does not mean that a pilot should not be vigilant in monitoring airspeed in all phases of flight.
 
As I understand it, it isn't a problem of indicated airspeed, but a problem of true airspeed. As you go higher, your true airspeed increases for any given indicated airspeed. Given that, there will be an altitude where your true airspeed will be so fast that if you exceed indicated stall speed, you exceed Mcrit, and if you decelerate below stall speed, you stall.
 
gotWXdagain said:
As I understand it, it isn't a problem of indicated airspeed, but a problem of true airspeed. As you go higher, your true airspeed increases for any given indicated airspeed. Given that, there will be an altitude where your true airspeed will be so fast that if you exceed indicated stall speed, you exceed Mcrit, and if you decelerate below stall speed, you stall.
Click to expand...
It helps if we stop thinking of stalls in speeds. Wings don't stall at airspeeds. They stall at the Critical angle of attack which can be at almost any speed.
 
z987k said:
It helps if we stop thinking of stalls in speeds. Wings don't stall at airspeeds. They stall at the Critical angle of attack which can be at almost any speed.
Click to expand...

Coffin corner, however, requires thinking in terms of speeds, at least in the high speed regime. Above Mcrit, angle of attack can be zero and airflow separation would still occur, because a sonic shockwave develops over the airfoil. That happens when a true airspeed limitation is exceeded and can be at any angle of attack. On the flipside, the low speed stall, obviously is entirely determined by angle of attack. One could therefore say that at Coffin Corner, the air is so thin that angle of attack must be so high that any increase in angle of attack will result in a low-speed stalled condition, but at that altitude true airspeed is so fast simply due to lack of air density that to maintain that altitude, any increase in true airspeed will result in a high-speed stalled condition (mach tuck).
 
You must log in or register to reply here.
Back
Top