Yak 1B (127) vs Yak 7 - sea level max. speed ?

[esk_pedja]

So what are these small differences between  Yak 1B (127)  vs  Yak 7:

- In sea level max speed and rate of climb ?

 

( I play a lot of quick missions and sooner or later they end up in dogfight at 50-120 m altitude )

 

Thanks in advance !

[FTC_DerSheriff]

 

The climbrates are very similar. The Yak-1b is a bit faster and I think lighter

[=GW=seaflanker819]

23 hours ago, DerSheriff said:

 

The climbrates are very similar. The Yak-1b is a bit faster and I think lighter

Hi, Dershiff, how do get the speed and climb rate data? Using special software or test manually?

[Sgt_Joch]

The Yak-1b and Yak-7 have the same engine, but the Yak-7 is a bit heavier which accounts for the difference.

[FTC_DerSheriff]

Speed it tested manually and converted into TAS and the climbrates are done with tac view.

[E69_geramos109]

Is weird that there is no fall of performance due to the stage change on the compressor. It looks like the graph of a plane like the 109 with variable speed compresor. 

[-250H-Ursus_]

On 7/1/2019 at 6:39 AM, E69_geramos109 said:

Is weird that there is no fall of performance due to the stage change on the compressor. It looks like the graph of a plane like the 109 with variable speed compresor. 

Read what Sheriff said.

 

He did the speed trials by himself and he did the conversión to TAS. Also its a Max Speed trial reached with Rads optimal on quickmission. 

 

Fall of perfomance exists and i'm used to deal with that when i fly Yak. 

 

The climbrate trial of TAC View shows perfectly the fall of perfomance on change stage. And TAC View Is doing calcs, Is not a person doing the trial by oneself.

 

Going back to original point.

 

I did my trials by myself on full closed Rads. Max Fuel and 90% RPM in order to reduce drag.

Kuban Map Autumn

 

Yak-1B reaches 542Km/h on sea level. Full closed Rads straight line. Only problem its engine overheat. After 3 minutes you start to lose HP and speed because you are overheating to much. After that pretty sure you blow up your engine.

 

Yak-7 its worst. 530 on full rad closed and overheat issues starts earlier and overheats to engine failure point very fast. You can possibly argue you can reach 542 on winter but you have the same problem.

 

Well. Take the Yak-1B. It's better and on my personal experience, deadlier. If you don't have La-5FN thats the plane you want to fly low.

Edited July 2, 2019 by -332FG-Ursus_

[-=PHX=-SuperEtendard]

5 hours ago, E69_geramos109 said:

Is weird that there is no fall of performance due to the stage change on the compressor. It looks like the graph of a plane like the 109 with variable speed compresor. 

This is because the measurement points are made each 1000 meters, since the second supercharger speed is also a fairly low altitude one, there isn't much gap between them, and it happens in between 3 points of the chart, with the middle point not being slower than the previous one, so no gap is noticed, but it's still there.

For example. if we take this chart picture of the Yak-9T speed
 

And then record the speed values each 1000 meters, it ends up looking like this:

 

The supercharger gap happens a bit before and after 2 km, and isn't appreciated by the current 1000 meters precision. We know it isn't ideal, but for the majority of the planes it works ok for comparison purposes, and having to adjust a higher precision (like 100 meters) would significantly increase the time required to make these tests (with "just" 1000 meters it can take up to an hour with time compression to test a plane with it's different engine settings from sea level to 9000 meters as both Sheriff and myself do each time a new plane is released).

 

Other planes that have a higher altitude second supercharger speed or stage do have this effect portrayed by the current 1000 meters steps
 

Edited July 1, 2019 by -=PHX=-SuperEtendard

[Bert_Foster]

Err we don't have an LA5F in game ... an LA5 and LA5Fn yes

[FTC_DerSheriff]

5 minutes ago, Bert_Foster said:

Err we don't have an LA5F in game ... an LA5 and LA5Fn yes

We have a "early" La-5F ingame. A La-5 with M-82F engine but no bubble canopy etc.

[Bert_Foster]

I know its being a pedant but the LA5 we have in game is not an LA5F it is the  LA5 Series 8 .... a different beast air frame wise to the LA5F depicted in TSAGI/NIIVVS colour charts.

The LA5 was powered by the M82A, The game specs list the engine in the LA5 series 8 as the M82.

 

The LA5F was powered by the M82F (the M82F is not listed in game against the LA5 series ?

 

The LA5 FN by the M82FN the game lists the engine in the LA5FN as the M82FN.

 

So I still believe the LA5 we have in game is indeed the bog standard LA5 not a non bubble top F etc.

Edited July 4, 2019 by Bert_Foster

[Sgt_Joch]

The standard model is a la-5 series 8.

 

It is the optional engine that turns it into a later series. Apparently several hundred early non-bubble top la-5Fs were produced.

 

more info here:

 

 

Edited July 4, 2019 by Sgt_Joch