how are these 109s turns 180 with out penalties?

[Robo.]

Originally Posted by robtek

As a matter of fact every! german plane leaving the production line was tested to meet the standards before it was delivered to the Luftwaffe.

Any plane not meeting the tolerances was sent back for refurbishing.

I believe the procedure became more lax in 1945, though.

I also believe that the allies had something similar.

Of course, robtek. But still, the tolerance for max speed at sea level for Bf 109E was 500kim/h +- 5%. That means that anything between 475 - 525km/h would do and they'd be concerned about that MINIUS more than a plus. Every aircraft delivered to the customer (air force) would be tested before accepting it, that's for sure.