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gothkrieger
02-07-2012, 07:38 AM
Trying to fly P39 and need some tips.

Looking at complex engine settings. When I fly I am sure I am not getting full performance out of her and I end up overheating fairly often. I am looking for prop pitch settings for cruising and combat. Along with throttle settings probably governed by manifold pressure readings. Any old P39 hands, looking for your tips and specs.
Thanks

DD_crash
02-07-2012, 02:38 PM
Trying to fly P39 and need some tips.

Looking at complex engine settings. When I fly I am sure I am not getting full performance out of her and I end up overheating fairly often. I am looking for prop pitch settings for cruising and combat. Along with throttle settings probably governed by manifold pressure readings. Any old P39 hands, looking for your tips and specs.

Luno13
02-07-2012, 05:39 PM
WTF indeed.

DD_crash
02-07-2012, 06:11 PM
Good job I didnt write ****on :)

thefruitbat
02-07-2012, 07:04 PM
what version, 4.11?

x6BL_Brando
02-08-2012, 02:44 AM
Good job I didnt write ****on :)

Someone's always pressing my ****ons around here :rolleyes:

gothkrieger
02-09-2012, 01:26 AM
Yup, 4.11. Should think it would not vary too greatly between versions. Trying to determine what manifold vacuum reading, prop pitch setting data. What rpm is the power band at etc. Trying to fly some of these aircraft that have these considerations.
I know you set manifold pressure with throttle and rpm with prop pitch but what rpm am I aiming for. The recognising what the proper manifold pressure is still something I have to learn for example.

Skunk_438RCAF
02-09-2012, 01:31 AM
http://www.zenoswarbirdvideos.com/Images/P-39/P39SEFC.pdf

gothkrieger
02-09-2012, 06:23 AM
http://www.zenoswarbirdvideos.com/Images/P-39/P39SEFC.pdf

Thanks, intresting pdf, eager to test that out and see what results I will get.

thefruitbat
02-09-2012, 02:11 PM
4.11 will make a big difference, as settings that you could of flown at comfortably in 4.10, will now cause you engine overheat in 4.11.

A rule of thumb for 4.11 is that lowering RPM not manifold pressure will aid cooling more, so this means reducing pitch to drop the RPM's. Obviously you should reduce manifold pressue as well, although the game unlike real life will not have engine detonations with to higher manifold pressure and low RPM.

As to what the settings are on the 39, i can't give you much help, but if you can find something like this for the 39 (this is from the P51 pilots notes and i use it with good results flying the 51),

NORMAL:


Take off: 1490HP at 3000rpm (~40"Hg)


(at 13k feet) 1590HP at 3000rpm at 61"Hg


(at 27K feet) 1370HP at 3000rpm-61"Hg


PLANE LIMITS:


Take off Max: 61" at 3000rpm
War Mergency: 67" at 3000rpm
Militray power: 61" at 3000rpm
Max continous: 46" at 2700rpm
Max Cruise: 42" at 2400rpm


OPERATING RANGE:


Manifold Pressure: 29-37"Hg


RPM: 1850-2320


MAX airspeed is 505MPH.

EDIT, i see someones posted the 39's pilot notes. that should be an excellent start.

gothkrieger
02-10-2012, 07:49 PM
http://www.zenoswarbirdvideos.com/Images/P-39/P39SEFC.pdf

Well I have not been able to reach the 50.0 & 57 Manifold pressure readings shown on the pdf noted above. Either I am doing something wrong or 4.11 settings for P39 is not modeled on said information.
I will try it again tonight but doubt I will get it any closer. If anyone out there has been able to operate it at the limits shown I would like to know. That way I would know its the pilot not the plane that's the problem.

thefruitbat
02-10-2012, 08:02 PM
max seems to be 41" for manifold pressure in il2, and 3000rpm.

quite possible this could be because the p39 in game is moddeled with lower octane fuel, to the handbook settings posted.

gothkrieger
02-10-2012, 11:40 PM
Yup, that seems to be what I am getting as well. So factory stats are of limited use, we need IL2 flying stats.