So easy to compare the fan of these high bypass engines, to the toy fans of kids.
The wind blows, and it makes the fan turn.
If it blows from the front, the fan will turn it the proper direction.
And pilots know with a tailwind, the fan will turn in the "wrong direction"...
Tailwind limitations, gentlemen... Dont get a hot start...!
xxx
You kids dont know this, but in the 1950s, air forces had fighters with large nose inlets.
The F-84s, the F-86s, the F-100... and you guys with the RAF, the Lightning.
All it took was to put a few airplanes nose into the tail of preceeding plane.
In the Korean War, they started the first airplane of the line-up...
And its exhaust would turn the engine of the second plane, and so on.
Only one start unit needed. Save starters too. Just windmill needed.
I have seen some F-84s getting started that way.
xxx
One day I had problems starting one JT3D on my 707 in Sana'a, Yemen.
So, we got the plane on 3 engines to the runway.
Got it to high speed on the runway, and started the remaining engine.
Was by windmill + crossbleed. It worked. We got careful not to get a "hot start".
Apparently, crossbleed was not sufficient, but "supplemental" windmill helped.
Then taxi again, back for takeoff, we left the gear down for a while.
Certain we had hot brakes after that "not in the book" procedure.
Hope our friend
411A will not criticize we ex-UACI guys.
xxx
Happy contrails