Posts: 197
Joined: Tue May 02, 2000 11:13 am

4 Engined Regional Jets

Sat May 06, 2000 11:24 am

Many recent posts have commented that the DC10 and MD11 are no longer economical because they have 3 engines to maintain vs 2 in all of the new twinjets.

Makes sense to me.

Why then do I see MSP and DTW swarming with little regional jets with FOUR engines in NWA colors?

RE: 4 Engined Regional Jets

Sat May 06, 2000 12:32 pm

FYI those jets are BAe-146's. Originally BAe wanted to make the jet quiet, but since the only high-bypass turbofans around then were quite weak they had to put four of them on each jet. If I'm wrong, please correct me.

Posts: 3923
Joined: Mon Aug 23, 1999 5:35 am

RE: 4 Engined Regional Jets

Sat May 06, 2000 9:49 pm

The RJs your refering to are actually Avro RJ85 of which Mesaba Airlines, NW feeder, has 36 on order with 33 delivered.

http://fly.to/rorders The regional plane orders page
Flown: A319/320/321,A332/3,A380,AT4,AT7,B732/3/4/5/7/8,B742/4,B762/763,B772,CR2,CR7,ER4,E70,E75,F50/70,M11,L15,S20
Samurai 777
Posts: 2000
Joined: Thu Jan 27, 2000 2:56 pm

RE: 4 Engined Regional Jets

Sun May 07, 2000 6:19 am

Flying tiger's right. Mesaba has RJ85s, which is a newer version of the BAe 146-200. As far as I can remember, Hawker-Siddely, the original manufacturer of the BAe 146 (it was originally designated the HS 146, before the merger of HS and Vickers to form British Aerospace)couldn't produce a twin-engined regional jet at the time in the late '70s that would be quiet enough to meet increasingly strict noise requirements of airports. So four relatively weaker turbofans were actually quieter than two with greater power.

It was also made to operate from hot-and-high airports in Third World countries, that's one of the reasons for it having four engines. Jet aircraft typically require more fuel to takeoff and fly in hot weather or at high altitudes, both conditions which make air less dense and therefore make jet engines less efficient. The BAe 146 didn't sell as well as anticipated in Third World countries, possibly because it is expensive to maintain. But there are quite a few BAe 146s operating in Australia, especially in hot conditions, but no Avro RJ85, though. There are 10 BAe 146s (AirBC and Air Nova) in operation in Canada, so I've flown on a few of them, mostly on AirBC. There are a few other BAe146/Avro RJ operators in North America besides Mesaba, such as Air Wisconsin(United Express) and also several in Europe, where they found the biggest market.

RE: 4 Engined Regional Jets

Sun May 07, 2000 6:47 am

I read earlier in the forum, that the BAe146 has a military background. So maybe economics were not the priority when developing that AC.