Firstly I would like to say that I understand this may not be the most appropriate forum for this question however I figured the PMDG forums have some of the most knowledgeable and helpful members of the AVSIM community and I may as well have a go at asking for help over here.

 

I am currently completing all outstanding work for my aerospace engineering course here at college in London and am having trouble finding relevant and detailed info to complete this final piece. There are two questions I am struggling ith and it would be much appreciated if anybody knew any good sites or books where this specific information can be found.

 

q1:

Choose ONE TYPE (RR, PW, CFM, GE etc.) of modern aircraft gas turbine engine, then analyse AND evaluate its performance under varying conditions. Your choice may niclude: A large or small turbo-fan or a turbo-shaft engine.

 

q2:

Identify TWO DIFFERENT modern aircraft types which have different engine types installed then compare and contrast the performance and characteristic of each, including their various accessories.

 

NOTE: Any caps, underline or bold words were emphasized by the lecturer and not myself, I have copied the question directly from the actual paper.

 

If anybody has any help it would be much appreciated as it is proving difficult finding specific facts or figures.

 

Thanks

 

Rich

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Firstly I would like to say that I understand this may not be the most appropriate forum for this question however I figured the PMDG forums have some of the most knowledgeable and helpful members of the AVSIM community and I may as well have a go at asking for help over here.

 

I am currently completing all outstanding work for my aerospace engineering course here at college in London and am having trouble finding relevant and detailed info to complete this final piece. There are two questions I am struggling ith and it would be much appreciated if anybody knew any good sites or books where this specific information can be found.

 

q1:

Choose ONE TYPE (RR, PW, CFM, GE etc.) of modern aircraft gas turbine engine, then analyse AND evaluate its performance under varying conditions. Your choice may niclude: A large or small turbo-fan or a turbo-shaft engine.

 

q2:

Identify TWO DIFFERENT modern aircraft types which have different engine types installed then compare and contrast the performance and characteristic of each, including their various accessories.

 

NOTE: Any caps, underline or bold words were emphasized by the lecturer and not myself, I have copied the question directly from the actual paper.

 

If anybody has any help it would be much appreciated as it is proving difficult finding specific facts or figures.

 

Thanks

 

Rich

 

 

the 757, 777, 747, and a320 all offer different engine options.

the 757, 777, 747, and a320 all offer different engine options.

 

Yes, but you missed the fact that it was a trick question, the question mentioned 'different engine types' not 'different engine makes'. So what they want, is either an aircraft type that will have had either different propeller engine types, such as a normally aspirated IC engine, and either a supercharged version of the same, or a turboprop, or props and jets (a rare occurrence) or more likely a type which has had both regular turbofans and high bypass turbofans fitted.

 

Thus the obvious choice would be the Boeing 737, for two reasons, A it has had both jet types (JT8D and CFM56) and is probably the most well documented airliner type in the world, since it happens to be the most numerous and has been in production for 45 years. And B choosing the 737 also has the advantage of halfing the research time, since research can suffice to answer both question one and question two with the CFM56 being your gas turbine choice, which is the essence of speedy research technique. So...

 

The main performance characteristic differences for the CFM on the 737 to research are: reduced noise, reduced fuel burn, different thrust method (mainly bypass air as opposed to reaction jet output), increased pressure ratio, reduced turbine and compressor stage complexity, more effective thrust reverse methodology, increased engine diameter, mounting redesign necessity, additional thrust vectoring owing to mounting angle change, increased FOD damage risk, easier maintenance, increased TBO, increased reliability, increased weight and so lower CoG, different bleed air tapping, and then maybe look at further advances in its design, such as the CFM56-7BE Evolution variant. Things like that.

 

A good place to start, if you are stuck for where to look and want a decent overview, would be the Boeing 737 technical site: http://www.b737.org.uk/powerplant.htm

 

After that, here for the JT8D: http://www.pw.utc.co...ercial/jt8d.asp

 

And here for the CFM56: http://www.cfm56.com/products

 

A simple explanation of the main differences in a high and low bypass engine: http://www.aerospace...ion/q0033.shtml

 

Then you might want to look up this book, which has good discussions on the evolution of initial jet designs up through to the contemporary high bypass types with specific reference to the 737: http://www.amazon.co...wood Boeing 737

 

Happy reading.

 

Al

If your teacher wants different manufacturers, the 747, 767 and 777 and A330 have options for GE, PW and RR engines.

 

If he's talking about different types of turbine engines, the Dornier 328 comes with a prop or a turbofan.

 

Not sure I see the point of q2. What's the point of comparing different planes with different engines? There's no similarity, so what's the point? Apples to oranges if I ever saw it...

 

Paul

Not sure I see the point of q2. What's the point of comparing different planes with different engines? There's no similarity, so what's the point? Apples to oranges if I ever saw it...

Paul

 

These courses are all about testing peoples research capabilities.

 

Rich, I've noticed Patrick has PM'd you. If you need any more info give me a shout and I'll see what I can do. Due to my nature of work, I have a few contacts in RR that may be able to help me help you.

These courses are all about testing peoples research capabilities.

 

Exactly, all exams are like that to some degree. The Hindenburg is no longer in existence, but since we know its specs, they could still ask you to calculate its power to weight ratio to see if you understand the aeronautical principles behind doing so.

 

Al

Would you mind if I asked what sort of work this is? Ie university. The reason I ask is that there is a aerospace engineering course available at my university which I hope to study when the time is right and would be very interested as to wether the is the sort of thnk I can expect to see.

 

P.s. sorry I could not be of any help, I'm not as experienced as these lot yet!

If your teacher wants different manufacturers, the 747, 767 and 777 and A330 have options for GE, PW and RR engines.

 

If he's talking about different types of turbine engines, the Dornier 328 comes with a prop or a turbofan.

 

Not sure I see the point of q2. What's the point of comparing different planes with different engines? There's no similarity, so what's the point? Apples to oranges if I ever saw it...

 

Paul

 

The relevance is quite simple: imagine you are a fleet manager at a regional airline, should you buy a Dash-8 or an E-170 for your route. They can both fit roughly the same amount of passengers.

 

As for the OP, does you uni have access to Jane's publications (e.g. All the world's aircraft and I think they have a powerplant version too)? That was the go-to reference for courses that required detailed information on aircraft at my university. If not you could try asking the librarian if they have access to a similar type of reference.

 

Would you mind if I asked what sort of work this is? Ie university. The reason I ask is that there is a aerospace engineering course available at my university which I hope to study when the time is right and would be very interested as to wether the is the sort of thnk I can expect to see.

 

P.s. sorry I could not be of any help, I'm not as experienced as these lot yet!

 

Roughly yes, although you should expect a lot of dry maths and physics as well (speaking as a recent graduate from a Dutch uni course in aerospace engineering).

Ok so if the point in this is research, do you have any places to get accurate data? That's the first step to research since some of these things are proprietary.

Ahhh memories.

Hey guys sorry I didn't manage to post here this week as I have been a little busy with other pieces of work for this course. Thanks for all the links Al they seem to have some good useful information I can use and thanks too Richie for offering help and I will be sure to let you know if I need any more information. Well I guess I better knuckle down and get on with this work and try not to let the NGX distract me any more.

Cheers guys

 

Rich