PC12Fan
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E-170 W/ E-190ER Wing, Theoretical Range?

Fri Sep 21, 2007 2:25 am

Just curious, I wonder what the range would be for such an aircraft for those long-really thin routes.
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mrocktor
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RE: E-170 W/ E-190ER Wing, Theoretical Range?

Fri Sep 21, 2007 4:49 am

Difficult question. If you keep the 170's engines, you can increase MTOW some (due to more wing area, more lift) but not that much. If you bring the 190's engines along with its wing, that will increase your BOW quite a bit.

Wild ass guess, based only on unsupported assumptions about the weight difference between the wings and the Breguet equation, something in the neighborhood of 3000nm (with 170 engines). Might be a bit underpowered, which might force you to take a payload limitation under certain conditions (if you want max range).

I don't think the 170enstein has the looks of a viable product  Big grin
 
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RE: E-170 W/ E-190ER Wing, Theoretical Range?

Fri Sep 21, 2007 5:27 am

Quoting Mrocktor (Reply 1):

Yea, I know what you mean. I am really looking for a best guess which would incorporate the necessary designs (engines, strength, etc) to see what max range could be. For some reason, I had 3000 nm in my head too, but that is with no research or engineering knowledge. Just want to see if anybody with the know had an educated guess. Thanks for the input!
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longhauler
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RE: E-170 W/ E-190ER Wing, Theoretical Range?

Sat Sep 22, 2007 11:23 pm

The E190 holds roughly 13000 kgs of fuel, and burns roughly 950 Kgs a side in cruise. The aircraft in operation has no problem filling full fuel with a full passenger/cargo load. The longest flight we presently fly is YYZ-YYJ, 2100 miles. That would be the maximum theoretical range of the aircraft, as full fuel is loaded.

So, if you mated the E190 wing to a E175 fuselage, there would be no change ... full fuel again. Perhaps a bit longer range, if the aircraft weighed less.

Now, the E175 burns about 800 kgs a side in cruise. But that is at E175 weights. The E175 at roughly 38000 kgs is 13000 kgs lighter than the E190. There is a very good chance that at the higher weights, the smaller E175 engines would burn just as much fuel, as just as much energy has to be produced.

The only way a longer range can be produced is if fuel tankage is increased, filling more of the wing ... or introducing a centre fuel tank system. But remember, on a trans-con flight fuel burn increases at a rate of 17%. In other words, it takes 170 kgs to carry every 1000 kg increase in fuel.
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mrocktor
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RE: E-170 W/ E-190ER Wing, Theoretical Range?

Wed Sep 26, 2007 12:53 am

Quoting LongHauler (Reply 3):
Perhaps a bit longer range, if the aircraft weighed less.

That is the whole point of the exercise...
 
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longhauler
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RE: E-170 W/ E-190ER Wing, Theoretical Range?

Wed Sep 26, 2007 10:06 am

Quoting Mrocktor (Reply 4):
That is the whole point of the exercise...

I think you missed my point ... normally, when one reduces the weight of the aircraft it is made up by adding more fuel, thus giving longer range. For example, Air Canada's new B777-300s vice the -200s. But ..the 190 can already carry a full passenger load, and a full fuel load, so range would not change.

However, if you reduced the weight of the aircraft and kept the same fuel, you would have a fuel gain of approximately 170 kgs for every 1000 kgs of weight reduction. So, if you reduced MTOW by say 5000 kgs (a lot), you could now only carry approximately 40 passengers, but would only gain 850 kgs of fuel, or about 200 miles further range.

As I said, the best way to increase range of the 190 series is to increase the fuel capacity.
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mrocktor
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RE: E-170 W/ E-190ER Wing, Theoretical Range?

Thu Sep 27, 2007 1:21 am

Well, there are two ways to look at it. Either you consider you are starting with an E170 and tacking on a E190 wing or you consider you are taking a E190 and chopping off a big chunk of the fuselage.

The first point of view is "adding fuel capacity" to the E170. Yes, the bigger wing will be a bit heavier - but you get increased range. My WAG (wild assed guess) was ~3000nm.

The second point of view is "reducing weight" on the E190. Chopping the fuselage would mean losing a few thousand kg of OEW, and would also reduce the maximum payload. Since this does not translate into extra fuel, the gain in range is only due to the fact that less weight means less drag means less fuel burn. I don't know how much range you could gain this way, but I'd WAG that it is 500nm tops.

But all of this (except the actual numbers) was implied in the original post, which is what I meant in my response to you.  Wink

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