Glide ratio, or lack thereof. Swept wing fighters usually have a glide ratio of like 1.5:1, meaning you go 1.5 feet for every foot you drop. With the engine o

Glide ratio, or lack thereof. Swept wing fighters usually have a glide ratio of like 1.5:1, meaning you go 1.5 feet for every foot you drop. With the engine out you've lost the hydraulic boost you have over the control surfaces so the aircraft is going to become more and more difficult to control as it accelerates. Also, crap glide ratios mean it's much easier to get into an accelerated stall that almost instantly becomes a spin...and then you're really screwed. And the low glide ratio means that even if the control issues weren't there, you're not gliding your way out of a t-cell. I've flown over a flat-top cumulonimbus once with a friend who owned an Epic LT turboprop. Those things are...well, words fail. Epic ^ inf.