747400sp
Topic Author
Posts: 3890
Joined: Sat Aug 09, 2003 7:27 pm

What Was Going To Power The Twin Engine 727?

Sat May 27, 2006 1:29 am

Good afternoon

In the early 90's, there was a company that was going to covert 727 from a trijet to a twin engines jet. Seeing that the 727 had a 0.84 mach speed I know the CFM 56 would be under powered and RB-211-535 would be overpowed so what engines was they going to use?
 
SkydrolBoy
Posts: 334
Joined: Sun Sep 21, 2003 7:31 am

RE: What Was Going To Power The Twin Engine 727?

Sat May 27, 2006 5:43 am

I think it was going to be powered by IAE V2500's. I can't remember who was going to do the mod, but I'm pretty sure it was V2500's powering it.
 
113312
Posts: 598
Joined: Sat Apr 16, 2005 9:09 am

RE: What Was Going To Power The Twin Engine 727?

Sun May 28, 2006 1:48 am

I don't believe that the Mach speed of the plane had anything to do with the engine selection. The technical concerns are more with pod and pylon aerodynamics, systems compatability and integration, weight of the installation, what to do about the center engine inlet and exhaust and cost vs. return on investment.

Since the conversion was never done, it can be surmised that it just wasn't practical. Two approaches were and they are seen today as the Valsan (JT-8D-217) and QF (RR TAY) conversions. Both were undertaken to take advantage of existing engines that provided improvement in noise and exhaust emissions as well as thrust vs. fuel consumption.

The QF was engineered for UPS and provided the greatest improvement. However, improved performance in fuel consumption and noise was offset by poor thrust availability at high altitude. The plane perfomed well for takeoff and low altitude climb and cruise but poor, as compared to an unmodified plane, at higher altitudes.

Only the beancounters can say if the high cost of engineering and certification paid off for UPS. I don't believe that any of these remain in service. FedEx still operates the Valsan conversions as well as a large number of 727s with their original engines albeit with newer noise supressors in the exhaust pipes.

Who is online

Users browsing this forum: adools and 9 guests

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