Notices
Flight Schools and Training Ratings, building hours, airmanship, CFI topics

Turbine Time

Old 09-28-2006, 02:47 PM
  #1  
On Reserve
Thread Starter
 
CAPTAINxJSB's Avatar
 
Joined APC: Sep 2006
Posts: 12
Default Turbine Time

Is turboprop time considered turbine?
CAPTAINxJSB is offline  
Old 09-28-2006, 02:57 PM
  #2  
Prime Minister/Moderator
 
rickair7777's Avatar
 
Joined APC: Jan 2006
Position: Engines Turn Or People Swim
Posts: 39,100
Default

Originally Posted by CAPTAINxJSB View Post
Is turboprop time considered turbine?
Always. If somebody is looking for turbojet time, they will specify "turbojet". Otherwise turbine means turbo-prop or turbojet.

Major airlines routinely hire folks with only turbo-prop regional PIC time, although jet time does make you more competetive in most circumstances.
rickair7777 is offline  
Old 09-28-2006, 03:28 PM
  #3  
Gets Weekends Off
 
Laxrox43's Avatar
 
Joined APC: Oct 2005
Position: A320/321 FO
Posts: 1,114
Default

Rickair is dead on...

Just don't confused Turbo-props with a Turbo-Charged Reciprocating (Piston) engine...Whole different ball game...

Lax
Laxrox43 is offline  
Old 09-28-2006, 03:55 PM
  #4  
Gets Weekends Off
 
LAfrequentflyer's Avatar
 
Joined APC: Jul 2005
Posts: 2,242
Default

Turbo-prop is a turbine jet engine with the blades on the outside (propellers) - right?
LAfrequentflyer is offline  
Old 09-28-2006, 05:17 PM
  #5  
Gets Weekends Off
 
Joined APC: Jan 2006
Position: Sitting down and facing front. Why would you want to know that?
Posts: 536
Default

Originally Posted by LAfrequentflyer View Post
Turbo-prop is a turbine jet engine with the blades on the outside (propellers) - right?
Well, they still have the same blades on the inside, but they also have propeller blades on the outside. The propeller blades on the outside are usually driven by the air being moved by the jet engine. Sort of like an automatic transmision without fluid. Others are driven off of the shaft of the turbine through a gear reduction gear box.
WhiteH2O is offline  
Old 09-29-2006, 07:24 AM
  #6  
Gets Weekends Off
 
ctd57's Avatar
 
Joined APC: Mar 2006
Position: CRJ CA
Posts: 309
Default

Originally Posted by Shaun View Post
Well, they still have the same blades on the inside, but they also have propeller blades on the outside. The propeller blades on the outside are usually driven by the air being moved by the jet engine. Sort of like an automatic transmision without fluid. Others are driven off of the shaft of the turbine through a gear reduction gear box.
That is kind of right but doesn't really explain it clearly. There are 2 types of turbo props, direct drive and free-spinning. A direct drive propellor is driven directly from the compressor shaft through a reduction gear assembly. A free-spinning is not directly connected to the engine. A free turbine power section is added to the engine after the turbine section. The exhaust gases from the engine drive the free power turbine . The power turbine is connected to the propellor gearbox by a shaft. A PT-6 is a free spinning turbine, you can spin the prop without spinning the engine, with a direct drive, when you spin the prop, you are actually spinning the engine itself. You can tell which type of engine is the aircraft just by looking at it. A free-spinning prop, when shut down, is in the feathered position, a direct drive engine it is the low pitch high rpm position, or flat looking if you stand infront of the aircraft and notice alot of blade is exposed when shut down. But as said before, they are all turbines, they just function slightly differently.
ctd57 is offline  
Old 09-29-2006, 08:36 AM
  #7  
Prime Minister/Moderator
 
rickair7777's Avatar
 
Joined APC: Jan 2006
Position: Engines Turn Or People Swim
Posts: 39,100
Default

The term turbojet is often used to mean turbofan...most modern jet engines are turbo fans. A true turbojet takes 100% of the air through the engine and burns it with the fuel in the core...all of the thrust is from hot core air. Real turbojet are rarely used because they are very fuel ineffecient.

Modern jets of all sorts (military, airline, corporate) use turbofans...the guts of these engines are very similar to the free-spinning turboprop, it produces hot gas that is then used to drive a seperate turbine that drives a large fan on the front of the engine. Modern high-bypass turbofans take 100% of the air through the fan, but only 15% of that air then goes through the core section to get burned and produce thrust, the other 85% passes through the fan and then goes around the outside case of the core. This fan bypass air provides about 80-85% of the thrust, with the rest provided by leftover core air. Sounds complicated but it is more effecient than a real turbojet (but less effecient that a turboprop).

Basically we are flying turboprops...just with different propellors.
rickair7777 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
TOAD
Cargo
10
10-27-2006 04:41 PM
Islandhopper
Major
17
09-21-2006 07:32 AM
CashMcL
Hangar Talk
9
09-14-2006 11:19 AM
ukaviator
Regional
11
03-12-2006 06:20 PM
Jaybird
Hiring News
14
10-11-2005 08:55 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Thread Tools
Search this Thread
Your Privacy Choices