Guest

Tri-engine Aircrafts

Mon May 24, 1999 2:12 am

Hi :



I personally experienced that the three-engined aircrafts climb and fly better than all the other aircrafts. In other words, the DC-10 and MD-11 are more powerful than B767-300ER and B-777 when taking off. Although they consume more fuel than the others, they give a better performance ...

What do you guys think ...

Andy
 
cedarjet
Posts: 8103
Joined: Mon May 24, 1999 1:12 am

RE: Tri-engine Aircrafts

Mon May 24, 1999 10:44 am

a tri-jet is less powerful and has a lesser max climb performance than a twin. To be certified for operation, a new plane must be able to climb with one engine out. So a 757 must be able to climb with half of it's power lost, whereas an MD11, TriStar or 727 must be able to climb with only a third of it's power lost (not sure of exact rule on 4 engine designs). You can see that the power in reserve on a twin is correspondingly higher, and a twin would be able to outclimb any trijet, let alone any 4-engine design. This is why in some circles (the author included), twins are safer than 3- and 4-engine designs because most accidents occur on take-off and landing, virtually never over the ocean. The greater power-to-weight ratio in a twin gives an extra margin of power when it may be most needed.
fly Saha Air 707s daily from Tehran's downtown Mehrabad to Mashhad, Kish Island and Ahwaz
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Tri-engine Aircrafts

Mon May 24, 1999 11:34 am

You can't possibly evaluate the performance of the aircraft you were on. You don't know the factors involved to determine performance. What was the density altitude, the weight of the aircraft. Was it a max power takeoff or a reduced power takeoff. Was there a climb gradient to be met. Were noise abatment procedures in effect. These factors change with every aircraft form flight to flight. The performance of the jet is impossible to estimate from a passenger who know none of the variables.

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos