What does XB-39 stand for?

XB-39 stands for "Experimental B-39 bomber, B-29 with P-38 Allison engines"

How to abbreviate "Experimental B-39 bomber, B-29 with P-38 Allison engines"?

"Experimental B-39 bomber, B-29 with P-38 Allison engines" can be abbreviated as XB-39

What is the meaning of XB-39 abbreviation?

The meaning of XB-39 abbreviation is "Experimental B-39 bomber, B-29 with P-38 Allison engines"

What does XB-39 mean?

XB-39 as abbreviation means "Experimental B-39 bomber, B-29 with P-38 Allison engines"