A few Caravan / PT6 questions...
Ok the first.
On the top of the panel, on the pilots side, there is a placard that shows 4 RPM and Torque limitations.
Now I know that (Torque x RPM) / 5252 = SHP
The engine is rated to 675 SHP.
The first total is at a reduced torque, but max RPM, and it = 674 SHP
The second total is at max torque, but a reduced RPM, and it = 675 SHP
The engine can run all day at a reduced torque, and max RPM or vice versa, so that has me thinking, since max RPM and max torque would give around 705 SHP, is the 675 SHP a engine limitation, or an airframe limitation?
Question number two.
Once the fuel goes through the flow divider. It passes around the engine to the 10 primary nozzles and the 4 secondary nozzles.
There is no pump or anything like that, the fuel just passes through the pipes to the nozzles.
How does it find its way equally to all of the nozzles....? Like how does the first nozzles not end up with more pressure, while the top ones end up with next to none?
I just figured since fuel is a liquid and its not compressible, once it reaches a certain pressure in the nozzle as it tries to force its way out of the nozzle hole, it takes the path of least resistance and moves on to the next one, and so on and so on.
But that seems way too basic, but looking at the engine, its just a ring around the outside and into the nozzles... can't see anything special.
Question number 3.
What indications would a blocked fuel nozzle give you?
I realize that this is highly unlikely as the fuel passes through a filter, a 75 micron mesh, and a 10 micron mesh.... BUT... If it happened... What would I likely see?
I'm guessing a reduced torque, higher ITT's than normal for the torque setting, and inability to produce full power.
Would this damage the burner can by having an area that is not burning?
Sorry if the english is a bit off. It's been a long day in class....