Oil and radiator control = optimal engine performance?

[gpang788]

Got it now

Thanks Jatta!

[David198502]

my experience is that there isnt any difference in performance whether the rads are fully open or almost closed in the 109s.
i really doubt that its modeled correctly right now.
i reach the same top speed with rads fully opened on deck like i do with rads almost closed.
but of course too high temperatures will kill your engine.

[kestrel79]

I fly with them fully open. I tried to notice any speed difference when I close them in flight and did not.

[gpang788]

Originally Posted by kestrel79

I fly with them fully open. I tried to notice any speed difference when I close them in flight and did not.

Just tried them at various settings, dun think I noticed any difference too.

[5./JG27.Farber]

Oil 5 clicks open, water 40% open (thats two bars on the wing indicator if you can see it.)

[VO101_Tom]

Originally Posted by David198502

my experience is that there isnt any difference in performance whether the rads are fully open or almost closed in the 109s.
i really doubt that its modeled correctly right now.
i reach the same top speed with rads fully opened on deck like i do with rads almost closed.
but of course too high temperatures will kill your engine.

Of course, not good. I read, if the pilot need to air-braking, often opened the radiator instead of flap because they handled it more quickly. This behavior occurred between the half and full opening stage strongly...

[keinmann]

I just tested it in level flight with the 109E-1... I get 402km/h with water/oil rad fully opened, and I get roughly 434km/h with em closed.

[TomcatViP]

Yeah rads are inducing drag. The default's CoD FM is correct.

Of course if you are flying with some amount of side slip or at a low pitch you won't notice any difference

For the correct settings, don't forget that at low alt it would be more difficult to cool oil/glycol fluids in most situation -> the radiator opening would hence have to be wider (a strong point for cruising at alt )

@ Kein : you can reach easily 480/490 level with the E.

[VO101_Tom]

Originally Posted by TomcatViP

@ Kein : you can reach easily 480/490 level with the E.

490? How?

[TomcatViP]

I suspect a strong feel of disbelief in your words Tom

But anyhow I convinced myself to (re)write the answer :

Increase your speed by diving slightly at 5m/s. Once your reach 500+ (usually somewhere btw 520/540) level your nose and keep your trajectory straight with the utmost of attention. Your oil&glycol rads shld be nearly fully closed (at high speed the amount of airflow would be enough to cool your eng).

And Taaada ... Th's it Your speed will stabilize at 500 and then will very slightly decrease to 480/490.

Note that with a very shallow descent (what was authorized by international authorities for high speed record) you can keep 500 IAS deck (with something like 50m/min descent (150ft/min)