Performance Charts

[tailwheel]

I find the maximum airspeed I can reach in a plane. Then I test to see what the minimum and maximum mix can be to retain that air speed. I did not use exhaust smoke as a threshold. I probably will in future tests though.

[56RAF_Roblex]

Am I reading the IAS v Rad charts correctly for Yak1b & Yak7b?       Is it saying that for the 1b there is a fairly steady reduction in airspeed as you open up the rads but for the 7b you can open both rads as far as 40% before it starts impacting your IAS and the water rad has no impact below 60%?

Edited April 23, 2019 by 56RAF_Roblex

[tailwheel]

3 hours ago, 56RAF_Roblex said:

Am I reading the IAS v Rad charts correctly for Yak1b & Yak7b?       Is it saying that for the 1b there is a fairly steady reduction in airspeed as you open up the rads but for the 7b you can open both rads as far as 40% before it starts impacting your IAS and the water rad has no impact below 60%?

Yes, that is what I saw happen. The Yak 1.69 also performed like the 1b

Edited April 23, 2019 by Tailwheelbrownbear

[56RAF_Roblex]

9 hours ago, Tailwheelbrownbear said:

Yes, that is what I saw happen. The Yak 1.69 also performed like the 1b

 

Thankyou.  Can I ask a follow question though because in this case I *must* be reading the charts wrong. 

 

On that same 7b chart the line marked 'Oil[o]'  shows very little variation as the rad is opened while the line marked 'Oil[w]' shows a drop as the rad is opened.    I was under the impression 'Oil[o]' was supposed to show how the oil temperature changes as the oil radiator is opened and 'Oil[w] shows how oil temperature changes as the water radiator is opened. That would not make sense as I would expect the water rad to have little effect on oil temp and the oil rad to have a big effect.   Am I confused or did you make a mistake on the labels?

[tailwheel]

14 hours ago, 56RAF_Roblex said:

 

Thankyou.  Can I ask a follow question though because in this case I *must* be reading the charts wrong. 

 

On that same 7b chart the line marked 'Oil[o]'  shows very little variation as the rad is opened while the line marked 'Oil[w]' shows a drop as the rad is opened.    I was under the impression 'Oil[o]' was supposed to show how the oil temperature changes as the oil radiator is opened and 'Oil[w] shows how oil temperature changes as the water radiator is opened. That would not make sense as I would expect the water rad to have little effect on oil temp and the oil rad to have a big effect.   Am I confused or did you make a mistake on the labels?

Yes you are reading the chart correctly. I was surprised by that behavior too. There are a number of planes where the water rad also cools the oil temp. This seems to be a Russian thing. They must have run the water cooler around the oil cooler lines as well?

[56RAF_Roblex]

10 hours ago, Tailwheelbrownbear said:

Yes you are reading the chart correctly. I was surprised by that behavior too. There are a number of planes where the water rad also cools the oil temp. This seems to be a Russian thing. They must have run the water cooler around the oil cooler lines as well?

 

OK I can accept that the water rad seems to affect the oil temp as well but the bigger surprise is that you seem to show the water rad cools the oil more than the oil rad does. In fact that the oil rad makes hardly any difference if I am reading the chart correctly..   

 

I am assuming that 'Oil[o]"  is the oil temperature reduction caused by opening the oil radiator. Is that right?   If I am right then your chart appears to show that running with the oil radiator closed means the oil temp is about 119 and running with the oil radiator fully open at 100%  only reduces the oil temperature to about 115.  Surely one of us has things back to front or I am looking at the wrong line?

[MasserME262]

wow this is very nice, thank you!

I have no idea how accurate is, but the effort put on this is to be recognized.

 

And also Im tired of seeing charts of "RAF test in 1942 of captured enemy plane..." Yeah that's real life, its good to know history but I'm playing a game and need the performances in this game!

 

So, I say thanks once again.

[rogueblade]

On 3/23/2019 at 4:35 PM, Tailwheelbrownbear said:

 lines and numbers show what alt to set mix at, green=summer , blue=winter

Yak 7 ser 36

 

As a Yak7b learner, can someone explain to me how to read these 3 charts?

 

chart 1: Mix vs TAS - Does this tell me (depending on the season), at what altitude, how much to reduce my oil mixture? So for example at 4k meters in the summer my fuel mixture should be lowered to just under 80%? What is the min (dotted) vs max (solid) line?

 

chart 2: Airspeed - Does this tell me the best air speeds I can achieve at certain altitiudes? What do any of the coloured lines mean?; base vs cont vs cruise, R2600, hg100 etc? I presume that S1 and S2 mean supercharger setting 1 and 2, but the rest I don't understand.

 

chart 3: Rad vs IAS - Does this tell me the optimal percentage to open my oil and water radiator when travelling at a certain speed, or to achieve a certain speed, or to maintain a certain temperature? What are the various dotted lines vs the solid lines. Also why does oil max = 115? Can it go beyond 100%?

 

Edited August 13, 2020 by rogueblade