Topic Author
Posts: 3900
Joined: Sat Aug 09, 2003 7:27 pm

Why Did RB-57F Need The Extra J 60 Turbojets?

Sun Sep 24, 2006 6:20 am

The RB-57F was powered by two TF 33 turbo fans and two J 60 turbo jets. The RB-57F was not big plane, so I would think the two TF 33 had enough power to get the thing off the ground, so why they need those two J 60?
User avatar
Posts: 4127
Joined: Wed Mar 02, 2005 9:38 am

RE: Why Did RB-57F Need The Extra J 60 Turbojets?

Sun Sep 24, 2006 7:27 am

According to my 1974 The Observer's Basic Military Aircraft Directory, the auxiliary J60s were not always carried. Their mountings could also be used for tanks or other equipment. So, the TF33s could indeed get the thing off the ground even with extra weight. I guess the auxiliary engines, like the huge wingspan, were needed to get the thing to 75,000 ft and keep it there.

Peter Smile
The only difference between me and a madman is that I am not mad (Salvador Dali)
Posts: 6596
Joined: Tue Mar 21, 2000 6:25 am

RE: Why Did RB-57F Need The Extra J 60 Turbojets?

Fri Oct 06, 2006 8:30 am

At 70,000 feet max engine power will have dropped to something like 5% of sea level power.

So Ptrjong is right. They were there to get it up there before it ran out of fuel. And to keep it flying up there.

Also those J60s were not chosen by accident, but because turbojets lose slightly less power at high altitude than turbofan engines.
Always keep your number of landings equal to your number of take-offs

Who is online

Users browsing this forum: No registered users and 1 guest

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