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Let's talk about the Yak-7B


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#41 ShamrockOneFive

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Posted 21 April 2017 - 12:10

Why has the yak 1 and lagg 3 in bos the WK-105PF engine? Did yak 1 and the lagg 3 not the Klimow WK-105P?

 

I know you amended it to say Yak-1 instead of LaGG-3 later but FYI sources say the LaGG-3 Series 29 has the M-105PF engine as well (one of many examples: http://wio.ru/tacftr/lag.htm).By mid 1942 its the standard engine going into the Yak and LaGG series fighters. Definitely not a balancing thing.

 

Yak7B was about 100-200kg heavier then Yak-1B or Yak-1 with the same engine. So climb rate and turn rate should be worse then Yak-1B. So Yak7B was much more close to Yak-1 with PF engine and Yak1B was better plane for sure

 

That's what I'm expecting too. That said, 100-200kg isn't a whole lot so its going to be a subtle difference that experienced Yak pilots will surely notice but many are not going to see too much of a difference there. For 200kg a slightly faster diving aircraft with an extra machine gun isn't too bad :)


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#42 Trooper117

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Posted 21 April 2017 - 13:38

Yak, Yak, Yakety Yak!    :lol:


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#43 I./JG21-Radick

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Posted 21 April 2017 - 13:42

Ok then the fw 190 should also be able to dive well, the fw 190 is about 1000 kg heavier than 109 and yak but the 190 can't escape (dive acceleration)


Edited by I./JG21-Radick, 21 April 2017 - 13:42.

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#44 Finkeren

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Posted 21 April 2017 - 14:14

Ok then the fw 190 should also be able to dive well, the fw 190 is about 1000 kg heavier than 109 and yak but the 190 can't escape (dive acceleration)


It doesn't quite work that way. Form drag also plays a huge role in dive performance. We can compare the Yak-7B and -1B and say that the heavier -7B will probably dive (very slightly) better, because the two planes have very similar form and therefore similar form drag.
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#45 216th_Jordan

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Posted 21 April 2017 - 15:05

Btw: The russian planes seem to have been rather good at diving (just their top speed lacks sigificantly) as indicated by soviet testpilots when comparing for example the Lagg (I think) to the Spitfire. 
For me it will be an interesting plane, and I am somewhat sure that I will like it. It will probably be quite a bit faster than the s.69 Yak-1 due to improved aerodynamics (though I don't know how much in relation to the 1b), but it will likely not turn as well.


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#46 ShamrockOneFive

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Posted 21 April 2017 - 21:44

It doesn't quite work that way. Form drag also plays a huge role in dive performance. We can compare the Yak-7B and -1B and say that the heavier -7B will probably dive (very slightly) better, because the two planes have very similar form and therefore similar form drag.

 

There's also expectations of just how much faster a plane can dive. A lot of the time people are already in dire straights and diving from 3000 meters with a bandit in gun range. There isn't enough difference in dive acceleration to make that different.


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#47 I./JG21-Radick

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Posted 21 April 2017 - 22:03

I think the 190 should have the best diving acceleration, unfortunately this is not so (in bos)


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#48 ShamrockOneFive

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Posted 21 April 2017 - 22:17

I think the 190 should have the best diving acceleration, unfortunately this is not so (in bos)

 

Ideally you should take that to the FM forum and discuss it there with the requisite historical documentation and in-game testing.


Edited by ShamrockOneFive, 21 April 2017 - 22:18.

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#49 Y-29.Layin_Scunion

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Posted 21 April 2017 - 22:19

I think the 190 should have the best diving acceleration, unfortunately this is not so (in bos)

I find the 190 2nd only to the P-40 when it comes to diving but when accelerating into a dive, the 190 does this much faster than the P-40.

If you're diving away from a Yak that's been already shooting at you, don't expect to just pull away at the wave of your magic wand....

If you think something is wrong with the FM, test it and show what's wrong with it.  The 190 is one of the most capable aircraft in the game.  If not the best...


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#50 -=PHX=-SuperEtendard

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Posted Yesterday, 02:53

I noticed the Yak-7B model for Kuban has a retractable tail wheel, so it might be a bit faster than the regular Yak-1, if it compensates the slightly bulkier radiator.

 

CEbO6G8.jpg?1


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#51 CF-105

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Posted Yesterday, 06:46

I think the 190 should have the best diving acceleration, unfortunately this is not so (in bos)

 

I'm sort of half convinced you somehow missed the FW 190 FM update, because that aircraft is amazing now, yet you STILL want more.

 

At this point, it could have the FM of the Me 163, but if you were shot down more than five times in it, you'd still say it's under-performing.


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#52 ShamrockOneFive

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Posted Yesterday, 22:23

I noticed the Yak-7B model for Kuban has a retractable tail wheel, so it might be a bit faster than the regular Yak-1, if it compensates the slightly bulkier radiator.

 

CEbO6G8.jpg?1

 

Good spot! It does look like a retractable tailwheel. To the best of my knowledge the Yak-7 doesn't have this feature on all of the different models but I suppose this one might?

 

Interesting!


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#53 ShamrockOneFive

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Posted Today, 03:23

I have a question about the Yak-7 I hadn't thought of until now. The radiator in the Yak-7 is considerably larger than on either Yak-1 model that we have and looking at photos I can see that while there were a few different designs... it is indeed a larger radiator system. So that makes me curious... did the Yak-7 for some reason have needs for a more significant radiator system or does it just mean that it will be more capable of keeping the engine cool in hotter regimes?


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#54 -=PHX=-SuperEtendard

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Posted Today, 04:41

Good spot! It does look like a retractable tailwheel. To the best of my knowledge the Yak-7 doesn't have this feature on all of the different models but I suppose this one might?

 

Interesting!

 

Yak-1B from similar timeframe does have a retractable tailwheel, so it could be possible that they adapted that and other aerodynamic improvements to the Yak-7 I guess.

 

Lucas From Hell posted this picture some months ago, showing a Yak-7 which appears to have the same retractable landing wheel the 3D model for BoK has

 

pic_61.jpg

 

I have a question about the Yak-7 I hadn't thought of until now. The radiator in the Yak-7 is considerably larger than on either Yak-1 model that we have and looking at photos I can see that while there were a few different designs... it is indeed a larger radiator system. So that makes me curious... did the Yak-7 for some reason have needs for a more significant radiator system or does it just mean that it will be more capable of keeping the engine cool in hotter regimes?

 

it's a more "square like" design (a bit less aerodynamic), and it's placed a bit more in the front of the plane. Most profiles you can find in google have the Yak-7 with open radiator and Yak-1 with closed radiator, so that also creates the sensation that it's a bit bigger than what it really is. I took a couple Yak-1 and Yak-7 profiles that look accurate from wings pallete and cropped the open position for the Yak-7 so it's comparable.

 

uHuWKt8.png

There is some difference but it doesn't appear to be that much... since the design came from a trainer couldn't it be that with the Yak-1 part of the radiator is inside the fuselage, while with the Yak-7 having the space for the second canopy they had to move it downwards and forwards?

 

For example a big part of LaGG's water radiator sits inside the fuselage:

 

pic_10.jpg

Sadly I couldn't find a similar image showing Yak-1/Yak-7 interior to confirm this.

As a bonus, I made some months ago a picture with the profiles (from wings pallete) of some members of the Yak family at the same scale, good to see the progression in the development of these fighters:

 

Spoiler

 


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