Top Speeds at SL of BoS Fighters by Time of Year (Either 109s are UP, or Yaks OP)

[6./ZG26_Klaus_Mann]

I tested best speed achivable for short amounts of time by closing radiators flying over rivers at about 150m. I normally took the aircraft to about 95% Topspeed on Autolevel and open rads, then went manual and closed radiators to Topspeed.

 

Bf109G-2:  (Calibrates to 20° according to testing should do 535)

Autumn: 532

Summer 522

Winter: 562

 

Bf109F-4: (Calibrated Test results for 20° are 535 too at Combat Power)

Autumn: 532/556

Summer: 522/548

Winter: 562/590

 

Fw190 A-3

Autumn: 525/552

Summer: 515/545

Winter: 556/587

 

LaGG-3 20mm

Autumn: 513

Summer: 503

Winter: 543

 

La-5

Autumn: 547

Summer: 537

Winter: 578

 

Yak-1 (Overheats for 20 Seconds, continues without alerts, very wird behaviour indeed, engine damage after 5 minutes)

Autumn: 529    (tried 50% radiators, 516)

Summer: 518

Winter: 560

 

Can someone give me the Performance charts for the Yak-1? It does seem a good deal optimistic considering that the calibrated to 20° the Yak-1 would be in the region of 530kph, same as the 109 G-2.

 

 

 

 

[Art]

Nice job.

[6./ZG26_Klaus_Mann]

Well, I was bored, curious and the MP Servers are overloaded and running as smoothly as right angles.

[Matt]

Just FYI, temperature on the summer map is 25 °C and on the autumn map it's 15 °C.

[6./ZG26_Klaus_Mann]

Just FYI, temperature on the summer map is 25 °C and on the autumn map it's 15 °C.

Well, the 109s should be faster then. 535 is the German result.

[Matt]

Well, it does 532 km/h in your test and did you trim the stabilizer fully nose-down (which you have to do to get maximum speed)?

[6./ZG26_Klaus_Mann]

Well, it does 532 km/h in your test and did you trim the stabilizer fully nose-down (which you have to do to get maximum speed)?

Thnx M8, gave me up to 538.

Fact remains that the Yak is still very fast.

[Wulf]

Thnx M8, gave me up to 538.

Fact remains that the Yak is still very fast.

 

 

If Yak is doing about 518/519 km/h down near the deck that should be about spot on. 

[6./ZG26_5tuka]

With fully open radiators the Yak can do 490 km/h at full fuel on that altitude (in summer). It also didn't show overheating tendencies at this speed even though water temperature settled around 100°.

 

Bf 109 F-4 definetly sees overperforming with 548 km/h in summer as measrued by your test. G-2 should be a tad faster (as you wrote it should do 530km/h).

 

La-5 was tested with fortza I assume?

Yak-1 (Overheats for 20 Seconds, continues without alerts, very wird behaviour indeed, engine damage after 5 minutes)

Autumn: 529    (tried 50% radiators, 516)

Summer: 518

Winter: 560

 

Can someone give me the Performance charts for the Yak-1? It does seem a good deal optimistic considering that the calibrated to 20° the Yak-1 would be in the region of 530kph, same as the 109 G-2.

Just for clearance, to what season are you referring to?

[Finkeren]

I have no charts, but why does this seem wrong to you? A late model Yak-1 with an engine optimised for low level operation is slightly slower than the 109 and noticeably slower than a Fw 190 on the deck. That seems to jive pretty well with everything I've read about the Yak.

[JtD]

Thanks for testing and sharing.

 

Standard conditions at sea level are 15°C btw, so the autumn map figures might be the ones most comparable to real life figures.

[6./ZG26_Klaus_Mann]

With fully open radiators the Yak can do 490 km/h at full fuel on that altitude (in summer). It also didn't show overheating tendencies at this speed even though water temperature settled around 100°.

 

Bf 109 F-4 definetly sees overperforming with 548 km/h in summer as measrued by your test. G-2 should be a tad faster (as you wrote it should do 530km/h).

 

La-5 was tested with fortza I assume?

Just for clearance, to what season are you referring to?

Yes, Forsazh. The F-4 was nnever tested at full power, but 15kph+ to combat power seems realistic.

[Dakpilot]

http://forum.il2sturmovik.com/topic/18900-speed-kills/?p=297597​

 

Some similar speed tests in this thread, slightly different conclusions

 

Cheers Dakpilot

[LittleJP]

Fw 190 seems to be underperforming severely.

[Fern]

So by the speeds presented, the Russians perform the same speed regardless the radiator settings? While there's a difference in German speeds?

[6./ZG26_Klaus_Mann]

So by the speeds presented, the Russians perform the same speed regardless the radiator settings? While there's a difference in German speeds?

Actually it's a 30-40kph difference

[III/JG2Gustav05]

One intersting thing,  La5 in summer map, 12:00PM, 0 wind, at 500m  air inlet =100% air outlet=0%, oil rad=0%,  wep on, 100% prop pitch, throttle 100% get overheat message and oil temp reach 123C, cylinder temp 230C, keeps 535km/h speed untill Wep time limit reaches no engine damage!!!!!  L5 got an over-heat damage free engine !!!!

Edited October 31, 2015 by III/JG2Gustav05

[SR-F_Winger]

One intersting thing,  La5 in summer map, 12:00PM, 0 wind, at 500m  air inlet =100% air outlet=0%, oil rad=0%,  wep on, 100% prop pitch, throttle 100% get overheat message and oil temp reach 123C, cylinder temp 230C, keeps 535km/h speed untill Wep time limit reaches no engine damage!!!!!  L5 got an over-heat damage free engine !!!!

You should file a bugreport in the apropriate section!

Thanks for finding out!

[Matt]

Maybe he should redo the test a couple of times instead.

[6./ZG26_5tuka]

Maybe its an issue with quick missions. I broke my engine in a matter of seconds after closing my rads in a dive and mistakenly leaving them closed in the climbout in MP.

Edited November 1, 2015 by Stab/JG26_5tuka

[III/JG2Gustav05]

Maybe he should redo the test a couple of times instead.

I tried Several times in Quick mission, you can check it by yourself if you want. by the way the top speed seems just drops from 536 to 535 after overheat several mins. I doubt if this is so-called engine damage, 

Edited November 2, 2015 by III/JG2Gustav05

[Matt]

I tested it yesterday and fly the La-5 regularly (it's the soviet plane I fly the most).

 

I'm getting catastrophic engine damage (= engine stopped) a few minutes before the time limit of the boost usage is expired (not that those are related, temperature is causing the damage), even with fully open oil cooler.

[Y29.Layin_Scunion]

I just tested the La-5 and killed the engine from overheating without boost.  I simply closed inlet/outlet cowls and went full bore.  Engine overheat and damage in reasonable time.

Looks like another witch hunt to me.....

[III/JG2Gustav05]

For sure you will damage it if you close the air inlet and let the engine temp increase to 300C. according to the manual the oil temp should not higher than 115C,  in my case I got 123C and engine overheat message keeps showing up for 10 mins but nothing happens on engine.

[6./ZG26_Klaus_Mann]

Hey everyone, I just made a turn time test (cuz bored).

[Matt]

Just because no "engine damage" message shows up doesn't mean that the engine didn't get damaged. First indicator is a jumping needle on the tachometer. When you see that, you'll get "engine damage" message some time afterwards, but effectively your engine is already damaged.

 

Also as for the speed test, some planes side slip considerably if you keep the auto level on. The plane that shows this the most, is the Fw 190. So you can't use auto level to test the maximum speed.

[JtD]

Matt, have you tested the significance of side slip - do you know if this accounts for say 3 km/h or 30?

[6./ZG26_Klaus_Mann]

Matt, have you tested the significance of side slip - do you know if this accounts for say 3 km/h or 30?

Barely any.

[6./ZG26_Klaus_Mann]

Can someone point me to the 515-530 kph at SL for the Yak-1?

[III/JG2Gustav05]

Just because no "engine damage" message shows up doesn't mean that the engine didn't get damaged. First indicator is a jumping needle on the tachometer. When you see that, you'll get "engine damage" message some time afterwards, but effectively your engine is already damaged.

 

Also as for the speed test, some planes side slip considerably if you keep the auto level on. The plane that shows this the most, is the Fw 190. So you can't use auto level to test the maximum speed.

I dont care if the "engine damage" message shows up!! what I observed is the engine temp is higher than the max temp presented in the manual and it still can run at this temp with no speed loss till my test is end (10mins), how you can tell me the engine is already damaged if there is no speed loss of the AC?

Edited December 17, 2015 by III/JG2Gustav05