Radiator Drag of Yak-7/9 vs. Yak-1 and other Fighters

[6./ZG26_Klaus_Mann]

On the newer Yaks the Best Performance is achieved with 50% Open Water Radiator Flaps, closing or opening them any more or less creates more Drag. On the Yak-1 the Game still has the least Drag at 0%, it is Flush at 33% and 50% respectively, when by the New Logic they should have the Least Drag.

 

I hope the New Logic comes to other Aircraft as well, P-39 and P-40 desperately need it.

Edited May 26, 2020 by 6./ZG26_Klaus_Mann

[-=PHX=-SuperEtendard]

P-39 has it, least drag positions are 60% for water and 45% for oil radiators

[HR_Tofolo]

I don't think it's relevant for the yaks since for the actual FM it's useless to have the radiator less than 100% except for emergency purposes. Well, TBH sometimes you can put it to 80% in winter if you're brave enough

[216th_Jordan]

6 minutes ago, HR_Tofolo said:

I don't think it's relevant for the yaks since for the actual FM it's useless to have the radiator less than 100% except for emergency purposes. Well, TBH sometimes you can put it to 80% in winter if you're brave enough

 

What? Are you talking about overcooling?!

Usually leave my rads at around 50% for both and stop worrying, even in mild summer temps, only watch them in steep climbs or extended combat with slower speeds

[HR_Tofolo]

Just now, 216th_Jordan said:

 

What? Are you talking about overcooling?!

Usually leave my rads at around 50% for both and stop worrying, even in mild summer temps, only watch them in steep climbs or extended combat with slower speeds

On the Yaks?? 50% both and stop worrying?? We must be flying different sims. 

 

I only get overcooling with the P-40. All Klimovs (Lagg, Yaks, Pe2s) do get overheat pretty quickly and sometimes even with all rads at 100%.   

[FTC_DerSheriff]

7 minutes ago, HR_Tofolo said:

I don't think it's relevant for the yaks since for the actual FM it's useless to have the radiator less than 100% except for emergency purposes. Well, TBH sometimes you can put it to 80% in winter if you're brave enough

I dont know what you are doing with your yak. But you do it wrong

[1PL-Husar-1Esk]

Engine cooling is so efficient that I would think is too good in many examples.

 

[-=PHX=-SuperEtendard]

Just now, 1PL-Husar-1Esk said:

Engine cooling is so efficient that I would think is too good in many examples.

 

Engine cooling is more or less ok for what I can tell. In nominal power settings for standard temperature the engine temps are supposed to be around 100ºC with neutral radiator positions at max level speeds, and this is what happens in the sim. If you start doing stuff like climbing or low speed dogfights in summer temperatures then you can notice some of the limitations of the cooling system.

With over rich mixture and decreased RPM you can decrease the thermal output but in some situations this leads to some performance loss.

[FTC_DerSheriff]

Just now, HR_Tofolo said:

On the Yaks?? 50% both and stop worrying?? We must be flying different sims. 

 

I only get overcooling with the P-40. All Klimovs (Lagg, Yaks, Pe2s) do get overheat pretty quickly and sometimes even with all rads at 100%.   

I flew the 9 yesterday in wings. Given it was a very cold map but I had my oil at 10% and water at 50%. Other yaks run hotter. But not 100% hot.

[HR_Tofolo]

2 minutes ago, DerSheriff said:

I flew the 9 yesterday in wings. Given it was a very cold map but I had my oil at 10% and water at 50%. Other yaks run hotter. But not 100% hot.

 

I don't have any of the Yak-9s, but the 7 and the 1s (and the Lagg3 even more) get hot really fast.on max power which, as far as I know, is almost the optimal design regime. Moving them to the 2550 rpms does not help very much.

 

Of course in winter maps you can play a little bit more and go for that 80%, maybe less if you have been a while at some conservative rate.

 

     

[RavN_Sone]

3 minutes ago, HR_Tofolo said:

 

I don't have any of the Yak-9s, but the 7 and the 1s (and the Lagg3 even more) get hot really fast.on max power which, as far as I know, is almost the optimal design regime. Moving them to the 2550 rpms does not help very much.

 

Of course in winter maps you can play a little bit more and go for that 80%, maybe less if you have been a while at some conservative rate.

 

     

 

Something is very wrong here. 

Sorry for asking the obvious, but are you sure you always adjust BOTH radiators?

[CountZero]

1 minute ago, HR_Tofolo said:

 

I don't have any of the Yak-9s, but the 7 and the 1s (and the Lagg3 even more) get hot really fast.on max power which, as far as I know, is almost the optimal design regime. Moving them to the 2550 rpms does not help very much.

 

Of course in winter maps you can play a little bit more and go for that 80%, maybe less if you have been a while at some conservative rate.

 

     

Yes early yaks and especialy lagg3 overheat quickly in summer and autum maps even with 100% open rads youll overheat if you climb up to 4-5km, and on lagg i would just close them from 100% abow that alt and not mutch to keep airplane cold for when chase is neccesary. Yak-7 was problematic before last update it got fixed and now its same as yak-9 you can last on 50% water for up to 10min in low alt DF on autum map, probably harder on summer.

[HR_Tofolo]

3 minutes ago, RavN_Sone said:

 

Something is very wrong here. 

Sorry for asking the obvious, but are you sure you always adjust BOTH radiators?

Yes, for simplicity's sake (and because of the terrible rotaries of my G940 throttle) I have them both at the same control.

 

2 minutes ago, CountZero said:

Yes early yaks and especialy lagg3 overheat quickly in summer and autum maps even with 100% open rads youll overheat if you climb up to 4-5km, and on lagg i would just close them from 100% abow that alt and not mutch to keep airplane cold for when chase is neccesary. Yak-7 was problematic before last update it got fixed and now its same as yak-9 you can last on 50% water for up to 10min in low alt DF on autum map, probably harder on summer.

Thank you, this might be the key. I haven't flown Yaks enough with the 4.006 version, will definetely look closer at it (altough i'm afraid that the Lagg still overheats too much). 

Sorry if I derailed the post too much 

[CountZero]

2 minutes ago, HR_Tofolo said:

Yes, for simplicity's sake (and because of the terrible rotaries of my G940 throttle) I have them both at the same control.

 

Thank you, this might be the key. I haven't flown Yaks enough with the 4.006 version, will definetely look closer at it (altough i'm afraid that the Lagg still overheats too much). 

Sorry if I derailed the post too much 

Nothing got changed for lagg3 or early yaks so youll have same expiriance as before, but for Yak-7s are better now.

[cardboard_killer]

39 minutes ago, DerSheriff said:

Other yaks run hotter. But not 100% hot.

 

I'm no Yak mistro, but my experience is the same. I only have to go 100% with water when I'm in a long, slow turn fight on the deck.

[CountZero]

Just tryed Yak-9 with 100% open rads in QM on kuban autumn map Dfs with AI and after 7min got overheat messages, so if your hard fighting youll have problems but in normal flight it will work just fine on 50%, hard climbs will be problem and abow 4-5km temps are cold so its no problem there to climb and df hard for long time.

[1PL-Husar-1Esk]

2 hours ago, -=PHX=-SuperEtendard said:

Engine cooling is more or less ok for what I can tell. In nominal power settings for standard temperature the engine temps are supposed to be around 100ºC with neutral radiator positions at max level speeds, and this is what happens in the sim. If you start doing stuff like climbing or low speed dogfights in summer temperatures then you can notice some of the limitations of the cooling system.

With over rich mixture and decreased RPM you can decrease the thermal output but in some situations this leads to some performance loss.

I disagree , one to make my point. Others which are suspicious to from top of my head: Bristols ,Fokers D7

 

 

Edited May 26, 2020 by 1PL-Husar-1Esk

[Pict]

3 hours ago, 6./ZG26_Klaus_Mann said:

On the newer Yaks the Best Performance is achieved with 50% Open Water Radiator Flaps, closing or opening them any more or less creates more Drag. On the Yak-1 the Game still has the least Drag at 0%, it is Flush at 33% and 50% respectively, when by the New Logic they should have the Least Drag.

 

I hope the New Logic comes to other Aircraft as well, P-39 and P-40 desperately need it.

 

That'd be cool

[-=PHX=-SuperEtendard]

1 hour ago, 1PL-Husar-1Esk said:

I disagree , one to make my point. Others which are suspicious to from top of my head: Bristols ,Fokers D7

 

 

I agree about the engine cooling at idle it's too effective for many planes P-40 and Spit Mk IX had trouble with that, I bet yaks as well. But it seems to be an issue with the sim in general at 0 airflow, however the design spec of 100ºC at max level flight in standard conditions are correct.