I am so embarresed to ask these questions

[Maximillian_Jenius]

Originally Posted by killbilly

Wow. Obscure reference that I picked up nonetheless.

Originally Posted by Number1atNumber2

Good catch!

Huge sci-fi fan here, so of course I used to watch B5 before it went off the air!

Now, I need to talk to Mike Lewis about his avatar. Those shadow (first ones) shakes head!

[NJA_Capt]

Originally Posted by Cptnchia

A turbofan, especially a high bypass engine, which most airliners and bizjets use today, uses the thrust from the fan on the front just like a prop, but ducted, to produce the forward movement.

Up to a point. At a certain altitude they produce thrust 50/50 between the turbine and fan sections. Above that altitude the turbine produces more thrust than the fan section. Our bypass is 5:1, at FL510 the fan section is just along for the ride, the turbine section is producing almost all of the thrust at that point

[Cptnchia]

Originally Posted by NJA_Capt

Up to a point. At a certain altitude they produce thrust 50/50 between the turbine and fan sections. Above that altitude the turbine produces more thrust than the fan section. Our bypass is 5:1, at FL510 the fan section is just along for the ride, the turbine section is producing almost all of the thrust at that point

Yeah, I was just trying to keep it simple, but not too much. I guess we could go the engineer route and start pointing out all the tiny little differences between manufacturer, A/C type, and what not. Nothing like wallowing in minutia.

[Cptnchia]

Check this engine out.

[USMC-SGT]

Q400 has spoilers that assist the ailerons as well as automatically deploy when weight on wheels and power levers near flight idle to help slow us down on landing. If you are ever behind one on takeoff and we thrown the switch into "flight" we will position and hold with our spoilers deployed but as soon as we add power they drop down.

[Maximillian_Jenius]

Originally Posted by Cptnchia

Check this engine out.

While the GE 90 is awesome (and my favorite engine.) I hear that with the future next gen planes (A350 & 787, or a 777 replacement) engines with the thrust output of the 90 (115,000 lbs of thrust each side) won't be necessary.

So future planes with their composite structures engines need only be in the 60-73 lbs. of thrust range.

Anyone else heard the same?

Also, what are the specific technical details about the new "geared fan" turbofan, and how does it work different in relation to the more standard fare high bypass turbofan?

[JoeVFR]

Originally Posted by Cptnchia

Actually....depends on if you are talking about a turbojet engine or turbofan. A turbojet engine uses the thrust out the back to produce forward movement, ie, a jet fighter. A turbofan, especially a high bypass engine, which most airliners and bizjets use today, uses the thrust from the fan on the front just like a prop, but ducted, to produce the forward movement.

A turbofan and a turboprop work on the same principle, a low pressure turbine drives the prop or fan. A high pressure turbine drives the compressor (or N2 spool). There are usually multiple stages of each. For example, the GE CF34 has a two stage HPT and a four stage LPT. A high bypass engine like the CF34 or CFM 56 are high bypass engines, they develop thrust at low altitudes from the fan and as altitude is gained, they derive more thrust from the core.

[Number1atNumber2]

Originally Posted by Maximillian_Jenius

Huge sci-fi fan here, so of course I used to watch B5 before it went off the air!

Now, I need to talk to Mike Lewis about his avatar. Those shadow (first ones) shakes head!

B5 was my favorite series of all time. Although, season 5 of it sucked compaired to the first 4.

DS9 is a close second.

[mojo6911]

Originally Posted by BrewMaster

Not a dumb question. My girlfriend thought planes had gas pedals....I mean how else do they move on the ground?...Right?

When I took my girlfriend flying for the first time, I pretended I was steering on the ground with the yoke, then let her "steer" the airplane. It started veering off course. I got a little chuckle out of that.

[WalterSobchak]

Originally Posted by JA Yawd Bwoy

Are turboprops Turbine engines?

and do Turboprops have spoilers?


Sorry for the dumb questions but I don't know and I really want to know this info. WOW

No not according to RJ driversYes they are Turbine, but the N1 section is the prop!

Don't need spoilers the props have beta/reverse.

Hope that helps!

[ackeight]

Here is something that will blow everybodies minds. Turbine engines in the "near" future will be Oiless. That's right, no lube. Instead the shafts and other moving rotating parts will float on a cushion of air. This will reduce friction by quite a bit of percentage points directly relating to increased thrust for the size of engines and greatly reduced operating costs and increased TBO's and HSI's.

I found this out by watching the History channel "LUBE JOB". I was bored the first 57 minutes of the show then they showed this towards the end. I'll try to find a link or something to it.