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Why Did RB-57F Need The Extra J 60 Turbojets?  
User currently offline747400sp From United States of America, joined Aug 2003, 3757 posts, RR: 2
Posted (8 years 3 months 5 hours ago) and read 7515 times:

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?

2 replies: All unread, jump to last
 
User currently offlinePtrjong From Netherlands, joined Mar 2005, 4005 posts, RR: 18
Reply 1, posted (8 years 3 months 4 hours ago) and read 7501 times:

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)
User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6540 posts, RR: 54
Reply 2, posted (8 years 2 months 2 weeks 4 days 3 hours ago) and read 7247 times:

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, Preben Norholm
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