British FM killing the fun of the game for allied pilots.

[NZtyphoon]

Question is how quickly and how far did the oil pressure drop below the emergency minimum (30 lbs - normal pressure = 60lb/sq.in.) under negative g? Under what circumstances would the oil pressure drop below this minimum, and how long would it take for significant damage to occur to the Merlin, or any other engine? How would this be quantified and replicated in a flight sim?

Originally Posted by swift

So, do we know if the current overheating issue with all spit versions is a bug or incorrect FM? I really would like to know as I really struggle with these birds.

There shouldn't be a problem as long as your temperatures stay within the limits set by the Pilot's Notes - trouble is now the Merlins overheat far too quickly.

[SlipBall]

Originally Posted by NZtyphoon

Question is how quickly and how far did the oil pressure drop below the emergency minimum (30 lbs - normal pressure = 60lb/sq.in.) under negative g? Under what circumstances would the oil pressure drop below this minimum, and how long would it take for significant damage to occur to the Merlin, or any other engine? How would this be quantified and replicated in a flight sim?



There shouldn't be a problem as long as your temperatures stay within the limits set by the Pilot's Notes - trouble is now the Merlins overheat far too quickly.

Engine damage in seconds from lubrication starvation, in a Merlin or any other engine. Bearing coatings burns away, piston's are scored...would be nice to have engine proper use pilot notes posted. Many here push well beyond manufacturer use recommendations, that I'm sure of

[camber]

Supermarine test pilot Alex Henshaw was once critised by a new manager for doing so much sustained inverted flying (i.e -1g) in Spitfire demonstrations. His reply was (in Sigh for a Merlin p79):

"Spitfires are not flown inverted on test. It is true they are rolled and in some cases an inverted glide takes place, but as the engine cuts immediately on negative 'G', there is no power in use. I have discussed this at some length with the Rolls-Royce technicians and they are happy no damage occurs."

He goes on to say at one stage he and Geoffrey Quill were asked to invert a Spit from 20000 ft and no engine damage ocurred.

Here is the only known footage of Henshaw doing his routine in the movie "Ferry pilot". This is a Spit Va, you can hear the engine cutting during the inverted glides. I wonder whether at this point it was necessary to cut throttle to avoid sustained inverted running as the motor was less susceptible to neg g cutout.

http://www.youtube.com/watch?v=nCmzYccyBYM

[SlipBall]

Originally Posted by camber

Supermarine test pilot Alex Henshaw was once critised by a new manager for doing so much sustained inverted flying (i.e -1g) in Spitfire demonstrations. His reply was (in Sigh for a Merlin p79):

"Spitfires are not flown inverted on test. It is true they are rolled and in some cases an inverted glide takes place, but as the engine cuts immediately on negative 'G', there is no power in use. I have discussed this at some length with the Rolls-Royce technicians and they are happy no damage occurs."

He goes on to say at one stage he and Geoffrey Quill were asked to invert a Spit from 20000 ft and no engine damage ocurred.

Here is the only known footage of Henshaw doing his routine in the movie "Ferry pilot". This is a Spit Va, you can hear the engine cutting during the inverted glides. I wonder whether at this point it was necessary to cut throttle to avoid sustained inverted running as the motor was less susceptible to neg g cutout.

Keep in mind that possibly the oil pan had been changed out...anyone here having problems should observe their oil gauge as recommended, and learn to alter their flying style. Treat it like a car you just spent a bunch of money on.

[Osprey]

Originally Posted by SlipBall

...would be nice to have engine proper use pilot notes posted. Many here push well beyond manufacturer use recommendations, that I'm sure of

Rolls Royce specify in the notes that you can push past the limits, it is a risk to undertake. It's been published in this thread a few pages back by NZTyphoon.

[Kurfürst]

Interesting. Reeeallly interesting.

[ATAG_Dutch]

Originally Posted by Kurfürst

Interesting. Reeeallly interesting.

You think?

To me it sounds like the same old protagonists/antagonists pissing on a wall.

[Robo.]

Originally Posted by ATAG_Dutch

You think?

To me it sounds like the same old protagonists/antagonists pissing on a wall.

On the same old wall

[Ze-Jamz]

Originally Posted by Robo.

On the same old wall

..still going, it will never stop though..took 7 years in il2

[Ze-Jamz]

Originally Posted by ATAG_Dutch

You think?

To me it sounds like the same old protagonists/antagonists pissing on a wall.

Exactly