Originally Posted by robtek (Post 349704)

I, at least, see your agenda, Fenrir.

Crummp says that the spits/hurris are not outfitted for inverted flight!

That is 100% correct!

That doesn't say that said aircraft cannot endure inverted flight for a very limited time.

To be outfitted for inverted (neg g) flight the engine must get metered fuel AND oil-pressure during the inversion.

Afaik all piston drive AC during that time only could endure neg-g, some better than the others.

Originally Posted by VO101_Tom (Post 349759)

Many people do not know, but the DB 605 operating instructions also write, that prohibited the long inverted flight, because of the lubrication system.

Originally Posted by robtek (Post 349704)

Crummp says that the spits/hurris are not outfitted for inverted flight!

Originally Posted by lane (Post 349769)

Motor und Triebwerksanlage des Flugzeuges sind nicht zur Durchführung von Rückenflügen geeignet. Hingegen ist Motor und Triebwerksanlage geeignet für Kunstflug in jeder anderen Form, wo nur ganz kurzzeitige Rückenlagen in Verbindung mit anderen Flugfiguren vorkommen.

;)

p.54, Sigh for a Merlin, Testing the Spitfire by Alex Henshaw On the pull out from the flick roll, sometimes I would open the engine flat out in another vertical climb and at approximately 1200ft push the nose over forward and with engine closed complete the half of an outside loop, usually in those days called a bunt. I never really liked this manoeuvre either; it was easy but required heavy pressure forward on the control column and you could not afford to misjudge at 1200ft: with the nose going over down towards the ground the speed built up at such an alarming rate that it left no room to change your mind until it was too late. A the bottom of the inverted dive I would usually round-off to a few feet above the ground and then with as much pressure as I would dare on the control column - I say dare because I found it more disconcerting and frightening to black out from excessive negative g than I did from high loads in the postive position - I would push the machine into an almost vertical climb and then as it lost momentum from the negative g position pull the control gently over to form a half loop hoping as I did that the engine would burst into life as I opened the throttle. This it usually did with a spectacular sheet of flame pluming from the exhaust stubs caused by the unused fuel which had accumulated during the inverted manouevres.

Originally Posted by Crumpp (Post 349396)

I did watch the video. It is a cut scene from a movie that has nothing to do with reality.


I just checked the Mk I Operating Notes. Flying inverted is normal provided the engine is set up not to foul the aircraft with glycol and oil. It is done at high speed with the throttle closed and the pilot is instructed not to reopen the throttle until oil pressure is restored.