Simviation Forum - Flying Jets

Jun 8^th, 2004 at 12:08pm

ditto58 Offline
Colonel
I love YaBB 1G - SP1!

Posts: 70

I have just started trying to fly jets in FS2002 and CFS2. My question is in FS2002 how do I know what percent my power is set at? Is there a gauge on the jet panels equivalent to the tach on a prop plane? This is not a problem with CFS2 because the HUD shows the throttle setting.

Back to top

IP Logged

Reply #1 - Jun 8^th, 2004 at 4:20pm

OTTOL Offline
Colonel
Fintas, Kuwait (OKBK)

Gender:
Posts: 918

On a turboJET(727-DC8-737100)You would use engine RPM and monitor Turbine Temp or EPR(engine pressure ratio). On a turboFAN(Lear 45-777-747-757-Airbus)you monitor N1 and Turbine Temp again. On some aircraft fuel flow or N2 will also be used, but generally, N1 is used on modern jets as the primary reference for setting power.

.....so I loaded up the plane and moved to Middle-EEEE..........OIL..that is......

Back to top

IP Logged

Reply #2 - Jun 8^th, 2004 at 6:09pm

Lux13 Offline
Colonel
Italians do it better!!
Firenze

Gender:
Posts: 38

Hi!
Ottol is right!The gauge that you are looking for is the EPR or the N1!
The EPR gives you how much the engine is accelerating the air flow from the suction to the exaust (thrust ratio),and the N1 is for how much rpm the FAN and/or the low pressure turbine is going at!
Cheers!

Thank God for let me fly!

Back to top

IP Logged

Reply #3 - Jun 8^th, 2004 at 8:33pm

Nexus Offline
Colonel
The greater of two evils...

Gender:
Posts: 3282

Don't know why RR and PW still uses the EPR. That must a thing left from the days before there was an actual fan in the jets. But since more than 80% of the thrust comes from the fan (high bypass) one would think it's most logical to use N1 ???

Well in RR's case, they use triple spool engines, but PW has no excuses Grin

Edit: Is EPR short for Exhaust Pressure ratio, or ENGINE Pressure Rartio? Since you compare the ratio between intake and exhaust? ???
Anyone knows for certain? Kiss

Edit2: Ottol, as a 737 fanatic, the 737-100 is indeed a turboFAN aircraft, equipped with two Pratt & Whitney JT8D7 turbofans.

Back to top

IP Logged

Reply #4 - Jun 8^th, 2004 at 11:23pm

OTTOL Offline
Colonel
Fintas, Kuwait (OKBK)

Gender:
Posts: 918

Quote:

Edit: Is EPR short for Exhaust Pressure ratio, or ENGINE Pressure Ratio? Since you compare the ratio between intake and exhaust? ???
Anyone knows for certain? Kiss

What's that piece of machinery between these two called again? Roll Eyes

.....so I loaded up the plane and moved to Middle-EEEE..........OIL..that is......

Back to top

IP Logged

Reply #5 - Jun 8^th, 2004 at 11:36pm

OTTOL Offline
Colonel
Fintas, Kuwait (OKBK)

Gender:
Posts: 918

Quote:

: Ottol, as a 737 fanatic, the 737-100 is indeed a turboFAN aircraft, equipped with two Pratt & Whitney JT8D7 turbofans.

I DO stand corrected. The 737-100 AND the 727 both use the JT8 which is has a very narrow bypass section of ducted air. Two examples that I DO know are the Lear25(CJ610) and the T38(J85).

.....so I loaded up the plane and moved to Middle-EEEE..........OIL..that is......

Back to top

IP Logged

Reply #6 - Jun 9^th, 2004 at 6:53am

Nexus Offline
Colonel
The greater of two evils...

Gender:
Posts: 3282

Quote:

What's that piece of machinery between these two called again? Roll Eyes

Umm compressor? Stages? Combustion chamber, turbines
Damn I know I know...ARGH!!!!!!
I give up.....can I buy a vowel ???
Grin

Back to top

IP Logged

Reply #7 - Jun 9^th, 2004 at 1:55pm

OTTOL Offline
Colonel
Fintas, Kuwait (OKBK)

Gender:
Posts: 918

Quote:

What's that piece of machinery between these two called again? Roll Eyes

Ahhhhhhh........it's much simpler than you thought. The INTAKE(obviously at the front of the engine(regardless of AIRFRAME orientation;IE Kingair)) and the EXHAUST(The BACK of the engine).

Between the front and back of the engine IS the ENGINE.
Ergo the difference(ratio)from front to back would be the ENGINE pressure ratio.

.....so I loaded up the plane and moved to Middle-EEEE..........OIL..that is......

Back to top

IP Logged

Reply #8 - Jun 9^th, 2004 at 5:27pm

Nexus Offline
Colonel
The greater of two evils...

Gender:
Posts: 3282

So did I win anything? ???

(I was being a jackass , I kinda knew you meant ENGINE earlier as well, just tried to be funny, but I guess I failed Cry

)

Back to top

IP Logged

Reply #9 - Jun 9^th, 2004 at 7:57pm

OTTOL Offline
Colonel
Fintas, Kuwait (OKBK)

Gender:
Posts: 918

Quote:

(I was being a jackass , I kinda knew you meant ENGINE earlier as well, just tried to be funny, but I guess I failed Cry

)

Sometimes we have trouble detecting our own kind! Grin

.....so I loaded up the plane and moved to Middle-EEEE..........OIL..that is......

Back to top

IP Logged

Reply #10 - Jun 10^th, 2004 at 2:40pm

ditto58 Offline
Colonel
I love YaBB 1G - SP1!

Posts: 70

Thanks everyone. That does the trick.

Back to top

IP Logged

	Search the archive: