Spit IIa

[TomcatViP]

Originally Posted by IvanK

"What is the historical 109 turnrate?" .... same problem as always it depends whose data you believe !. It also depends on how the turn is being flown in each aircraft. You after Sustained or instantaneous ?

These charts are reasonable for sustained turn performance:

http://www.spitfireperformance.com/spit109turn.gif

Spit V 109 Turn times.

Those curves are contestable regarding how the both planes shld hve performed:
- first: on the ground of the knowledge of both nation at the time of the test/calculation (1940)
- Secondly : on the base of the contradictions that a modern analysis would tell us

First pt : If British engineer in 1940 had let an elliptical winged (EW) fighter be the most advanced defense they had allowed to be put on the frontline, for sure they were not aware of the advance Germans had made in that grounds. Remind that EW are the panacea only when dealing with inviscid flows etc... etc... Look at max Cl of both plane, max Pow and wing loading.

I know that I can be annoying but those value and the fact that the wing thickness of the spit is lower tell us that there SHLD be an inversion in turn radius as the speed decrease. in other terms the spit shld turn tighter at high speed but hve a greater radius of turn when the speed is low.

In other words they couldn't hve found any other value as their assumptions were made on false grounds.