Author Topic: Yak3 Drag modelling  (Read 19996 times)

Offline Arlo

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Re: Yak3 Drag modelling
« Reply #15 on: May 23, 2019, 11:46:18 AM »

Offline Shuffler

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Re: Yak3 Drag modelling
« Reply #16 on: May 23, 2019, 12:09:46 PM »
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Offline FLS

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Re: Yak3 Drag modelling
« Reply #17 on: May 23, 2019, 12:20:53 PM »
Well I should have thought that was obvious, it needs more of it!

Adding drag would make the climb rate and top speed too slow.

Offline bustr

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Re: Yak3 Drag modelling
« Reply #18 on: May 23, 2019, 12:23:20 PM »
The Yak3 has the Yak9 engine in a smaller lighter airframe. It's a little beast.

Unless our Yak3 is the 1945 version and not the 1944 version. The Yak9 until the Yak9u used the Klimov M-105PF 1210hp engine and the 1944 Yak3 used the Klimov VK-105PF2 1290hp engine. The Yak9u and 1945 Yak3 used the Klimov VK-107A 1650hp engine. Or are you talking about our Yak9T with the 20mm selected which makes it a (Yak9 M-105PF)?

You can see why I'm confused.....and I ain't talking no old drag.... :rolleyes:
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Offline Bushmills

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Re: Yak3 Drag modelling
« Reply #19 on: May 23, 2019, 01:02:56 PM »
Adding drag would make the climb rate and top speed too slow.

Yeah you've already said that, I still think the modelling isn't right.

Offline Wiley

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Re: Yak3 Drag modelling
« Reply #20 on: May 23, 2019, 01:04:22 PM »
(Image removed from quote.)

Isn't all drag overmodelled pretty much by definition?

Yeah you've already said that, I still think the modelling isn't right.

All you need to do is submit your proof to HTC to get it changed to what's correct.

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Offline bustr

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Re: Yak3 Drag modelling
« Reply #21 on: May 23, 2019, 01:42:17 PM »
I will venture if you use Google with Cyrillic script searching for specific Russian technical terms. You will access web sites by intense fans of everything WW2 VVS. I ended up with several language converters and searched for I16, Yak, La and ShVAK 20mm info you cannot find searching in English language on the other search engines. And be carfule, I found out searching for I16 info on Type 29 and rockets, I kept getting hits for S&M Russian hookers. Seems not all translating formats are equal. The Microsoft translator in Cyrillic translated to English had me looking for vicious hookers with blackjacks slung under the wings of I16. Google wants control of all your personal info but, they are really good for technical info searches.
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This is like the old joke that voters are harsher to their beer brewer if he has an outage, than their politicians after raising their taxes. Death and taxes are certain but, fun and sex is only now.

Offline Devil 505

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Offline Shuffler

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Re: Yak3 Drag modelling
« Reply #23 on: May 23, 2019, 04:23:11 PM »
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Offline Devil 505

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Re: Yak3 Drag modelling
« Reply #24 on: May 23, 2019, 04:42:16 PM »
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Offline The Fugitive

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Re: Yak3 Drag modelling
« Reply #25 on: May 23, 2019, 04:45:06 PM »
Yeah you've already said that, I still think the modelling isn't right.

Maybe its not "drag" you mean to talk about. Could it be "E" retention? If the Yak holds E better than it should though a series of "E" draining maneuvers it could still climb out like a rocket. If it burned "E" at a more reasonable rate you would have to build it back up before you could pull back on the stick and climb out like a rocket.

Offline FLS

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Re: Yak3 Drag modelling
« Reply #26 on: May 23, 2019, 05:19:53 PM »
Maybe its not "drag" you mean to talk about. Could it be "E" retention? If the Yak holds E better than it should though a series of "E" draining maneuvers it could still climb out like a rocket. If it burned "E" at a more reasonable rate you would have to build it back up before you could pull back on the stick and climb out like a rocket.

Energy retention is just a different way of saying the same thing.  You "burn" energy by turning, using lift, which results in induced drag, which slows you down unless you can balance thrust and drag. 

So far no reasons given to doubt the current flight model.

Offline Devil 505

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Re: Yak3 Drag modelling
« Reply #27 on: May 23, 2019, 05:33:34 PM »
Energy retention is just a different way of saying the same thing.  You "burn" energy by turning, using lift, which results in induced drag, which slows you down unless you can balance thrust and drag. 

So far no reasons given to doubt the current flight model.

It's not necessarily the same thing. Speed and climb charts are made with the plane at the optimal angle of attack to attain those numbers. The bleeding of "E" could be modeled in a way that rate of "E" lost at sub-optimal angles of attack is less than it should be.
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Offline FLS

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Re: Yak3 Drag modelling
« Reply #28 on: May 23, 2019, 06:28:58 PM »
Bleeding E is not a flight model parameter.  If the drag is wrong why aren't the speeds wrong?

Offline save

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Re: Yak3 Drag modelling
« Reply #29 on: May 23, 2019, 06:35:57 PM »
Unless our Yak3 is the 1945 version and not the 1944 version. The Yak9 until the Yak9u used the Klimov M-105PF 1210hp engine and the 1944 Yak3 used the Klimov VK-105PF2 1290hp engine. The Yak9u and 1945 Yak3 used the Klimov VK-107A 1650hp engine. Or are you talking about our Yak9T with the 20mm selected which makes it a (Yak9 M-105PF)?

You can see why I'm confused.....and I ain't talking no old drag.... :rolleyes:

AFAIK the Yak3P with the VK-107 also had 3 20mm cannons, and was made of metal.

It was one of the fastest plane at low alt during ww2 if you count russian vs japan last breath 1945 as ww2.

This littlestalin wood thing AH have is the only fighter plane that withstand a full second of the fury of an A8 with 4*20mm and 2-13mm, and fly away -showing middle finger at you, after which  he pull up and stay at rediculus angle climbing away infinitely.

The only way to kill them is to enter the cockpit and stab him.
« Last Edit: May 23, 2019, 06:39:29 PM by save »
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