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Old 05-21-2020, 11:40 PM   #261
amazingme
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Dora don't have Meredith effect in cooling system.
Any way D-9 needs enormous amount of power for speed compare to k-4 and p-51
And p-51 has low parasitic drag, mustang has problem with induced drag.
That's not proven.. even today. If you've heard about Strega Air Racer then you should know they're using modern type cooling for their P51, with different ducts and longer scoops and actually that's a well kept secret. On the other hand the Meredith effect it's based on some assumptions that we know today that they are not quite valid.

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Old 05-22-2020, 06:12 AM   #262
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That's not proven.. even today. If you've heard about Strega Air Racer then you should know they're using modern type cooling for their P51, with different ducts and longer scoops and actually that's a well kept secret. On the other hand the Meredith effect it's based on some assumptions that we know today that they are not quite valid.

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I know they do, but no one said that cooling from P-51D is perfect.
ofc the p-51 dont have laminar air flow wings,but they do provide low drag at high speeds, as far as i know Reno racers don't change wings airfoils in their race p-51, that must mean something
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Old 05-24-2020, 11:58 PM   #263
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How can you do it? i can make something around 315kts.
I agree with you, look at cross section of the p-51 it is tiny plane, + it has laminar air flow wings, which supposed to lower the drag at high speeds+ it has additional thrust provided by oil/coolant scoop.
67" Hg, 2700-2800 rpm.
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Old 05-25-2020, 06:00 AM   #264
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I was quoting iFox.. In any case, P51 is draggier than Dora at high speeds. The parasitic drag (form, skin and interference drag) increases with the square of speed. What P51 is doing in DCS has nothing to do with reality.

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You forgot to mention that wing area of P-51 is much more than Dora has, that makes overall drag closer to Dora. And Dora has significantly more power (thought power is only in 1/3 power relative to the speed).
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Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me
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Old 05-25-2020, 06:09 AM   #265
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Originally Posted by grafspee View Post
Dora don't have Meredith effect in cooling system.
Any way D-9 needs enormous amount of power for speed compare to k-4 and p-51
And p-51 has low parasitic drag, mustang has problem with induced drag.
Any plane with significant engine power and proper air passage design has this effect. So, Dora and 109 too. It's not something magic, it's just a plain ramjet. You have an inlet to reduce air speed and transform its kinetic energy to pressure and temperature, then heat it adding energy and through it through a converged nozzle to transform this energy to thrust. If you have low losses throughout the air passage and enough heat you can have even thrust but not so much typically. But even zero radiator installation drag is a great deal, though.
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Ніщо так сильно не ранить мозок, як уламки скла від розбитих рожевих окулярів
There is nothing so hurtful for the brain as splinters of broken rose-coloured spectacles.
Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me
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Old 05-25-2020, 06:14 AM   #266
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You forgot to mention that wing area of P-51 is much more than Dora has, that makes overall drag closer to Dora. And Dora has significantly more power (thought power is only in 1/3 power relative to the speed).
Welcome back, I haven't seen your posts for quite time. It could be that i missed some.
So what is making that Dora's top speed is about the same, when D-9 has more power.
Does drora's prop play role here?
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Old 05-25-2020, 10:06 AM   #267
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You forgot to mention that wing area of P-51 is much more than Dora has, that makes overall drag closer to Dora. And Dora has significantly more power (thought power is only in 1/3 power relative to the speed).
What makes the P51 draggier at high speeds is the sudden change of shape in cross section due to those radiators. The smoother this change is the less parasitic drag it has, just like Dora. And btw, the wetted surface of Dora's wings is.. elliptical. We don't want to start the Clmax discussion again.. don't we?
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Old 06-30-2020, 10:05 AM   #268
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Hi everybody …
Recently got into ww2 props, and now I hardly fly much else. Dora is my favourite. I've heard whilst flying and watching youtube videos, other peoples ideas on how the planes should perform and how you should deploy it. So I have been trying to fly using the hit and run tactics on the storm of war server.

I have noted that if I run in and engage a bandit and egress straight out, without making hardly any turns and full throttle mw50 etc, a circling P51 will be able to catch up with me. I debated adding a climb to my speedy egress, however I was not confident I would lose the stang!
I also noted when going out to sea on a long constant gradual climb to high altitude to intercept bombers, I turned around to see a P51 sat point blank behind me. He clearly had been there a while, noting I hadn't seen him due to no rear mirror, and was lining his guns up to shoot me down just before I engaged the bomber. He shot me down no worries lol. I had my engine pretty much maxed, and he was living his best life trolling me haha.
I love the dora, but am not sure how best to deploy it now. Could probably do with flying with other dora pilots to be fair.
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Last edited by chris_lancaster; 06-30-2020 at 10:07 AM.
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Old 06-30-2020, 04:40 PM   #269
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you need to be flying a me262 to achieve the sort of raw performance disparity that allows you to just walk away from a guy like you're expecting.

if you want to abuse your advantages, well... don't do anything the other guy can do too! any airplane can do a nice relaxing climb. now if you zoom climb, you'll peter out after a couple thousand feet, but do you think the p-51 will be able to do a circle and then also have the energy reserve to zoom up to the same height? all of a sudden you've done something he can't do.
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Old 06-30-2020, 05:40 PM   #270
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you need to be flying a me262 to achieve the sort of raw performance disparity that allows you to just walk away from a guy like you're expecting.

if you want to abuse your advantages, well... don't do anything the other guy can do too! any airplane can do a nice relaxing climb. now if you zoom climb, you'll peter out after a couple thousand feet, but do you think the p-51 will be able to do a circle and then also have the energy reserve to zoom up to the same height? all of a sudden you've done something he can't do.
He probably met an AI..

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