Spit IIa is now so much more inferior to the 109

[IvanK]

"Should be possible to fly up to 30 minutes at + 9lbs and 2850 RPM. Actually it is not possible to fly even at +6 1/2 lbs at 2850 RPMs for 30 minutes."

Well sort of. 30 mins is a general limit. As to be able to actually do it is subject to Oil temp and Coolant limits staying within limits.

It seems the real issue in CLOD with the Merlins is keeping Oil temp below 95C. If you do this then generally there is not an issue. Go over 85C and the windscreen gets oily quickly.

The Source Document (AP 1565B) is RAF Pilots notes for the Spitfire II

[Crumpp]

LMAO, It is very realistic to use a climb rating for cruising.

[41Sqn_Banks]

Originally Posted by Crumpp

LMAO, It is very realistic to use a climb rating for cruising.

It is valid according to "AP 1732b Instructors' Handbook of Advanced FlyingTraining, 1st Edition" to use climb power for other "conditions of flight in which really high power is required".

[CWMV]

Originally Posted by 41Sqn_Banks

It is valid according to "AP 1732b Instructors' Handbook of Advanced FlyingTraining, 1st Edition" to use climb power for other "conditions of flight in which really high power is required".

First thing that came to mind when I read the bold above:

[WTE_Galway]

Originally Posted by 41Sqn_Banks

It is valid according to "AP 1732b Instructors' Handbook of Advanced FlyingTraining, 1st Edition" to use climb power for other "conditions of flight in which really high power is required".

Not sure where the "cruise" reference came from but cruise, by definition, is the range of power settings that provide the best level flight fuel efficiency. That is what all pilots mean by cruise - fuel efficient flight.

Whilst you may be able to use climb power to sustain high speed level flight there is no way climb power is a "cruise" condition, that is just stupid. Its important to get definitions right or these threads devolve into pointless arguments about exactly what a term actually means.

Maybe you are permitted to use climb power for sustained high speed flight, but calling that "cruise" just confuses the issue.

[41Sqn_Banks]

Originally Posted by WTE_Galway

Cruise by definition is the range of power settings that provide the best level flight fuel efficiency. That is what all pilots mean by cruise - fuel efficient flight.

Whilst you may be able to use climb power to sustain high speed level flight there is no way climb power is a "cruise" condition, that is just stupid. Its important to get definitions right or these threads devolve into pointless arguments about exactly what a term actually means.

Maybe you are permitted to use climb power for sustained high speed flight, but calling that "cruise" just confuses the issue.

You are correct. I don't know why Crumpp came up with "climb rating for cruising" as no would call it "cruising" when you apply "climb rating". I only wanted to show that "climb rating" is not deemed to a flight conditions where rate of climb is > 0.

About "cruising" definition. In RAF terminology there are 2 "cruising" or "continuous" ratings. The higher one ("rich continuous") is the maximum power that can be obtained without time limit and if the engine runs at this setting it will have a reasonable life time of 100 hours. Everything setting above that shortens the engine life at a higher rate. Everything below that setting will lengthen the engine life.
The lower one ("weak continuous") is for the limit for the use of mixture control at "auto weak". This is a simplified guideline for best fuel efficiency, however there are many factors the influence best fuel efficiency. More details about how to obtain best fuel efficiency are typically given in the Pilot's Notes of each aircraft.

[5./JG27.Farber]

Originally Posted by IvanK

The Source Document (AP 1565B) is RAF Pilots notes for the Spitfire II

...and the date of publishing? NM, I found it July 1940.

http://www.scribd.com/doc/46069063/1...e-II-Aeroplane

Originally Posted by Kwiatek

There is definilty bug in SPitfire MK II engine.

According to manual Spit MK II should have power settings:

- climbing power (30 minutes) - +9 lbs at 2850 RPMs
- max all level (5 minutes) - 9 lbs at 3000 RPMs

In Clod there is engine broken after flying at +6 1/2lbs at 2850 RPMs after ab. 10-15 minutes continous flying

If you apply +9 lbs at 2850 RPMs you could fly ab. 2-3 minutes then engine broke.

It is not correct that you cant even fly 30 minutes at 6 1/2 lbs 2850 RPMs if you should be able to fly such time with +9lbs 2850 RPMs.

Other hand Bf 109 E could fly all time at 1.35 Ata power settings without problem if it was only 5-minutes emergency power.