Fresh stuff from sukhoi.ru (Discussion)

[Skoshi Tiger]

Originally Posted by Insuber

Dynamic Stall: go to Wikipedia if you want. Today only the normal stall is modeled - not good for a flight simulator.

Cheers,
Ins

When you go to wikipedia and look up dynamic stall it redirects you to stall where it says

"Dynamic stall is an effect most associated with helicopters and flapping wings. During forward flight, some regions of a helicopter blade may incur flow that reverses (compared to the direction of blade movement), and thus includes rapidly changing angles of attack. Oscillating (flapping) wings, such as those of insects— including the most famous one, the bumblebee — may rely almost entirely on dynamic stall for lift production, provided the oscillations are fast compared to the speed of flight, and the angle of the wing changes rapidly compared to airflow direction.[22]"

Is this relavant for the fixed wing aircraft in this sim? If so how?


Cheers!

[Swoop]

Just had a session on ROF with some mates, second time online and not much sucess. Had 10 minutes to kill so jumped on the ATAG server in a Spit2 and what a blast, the speed and the feel. Took out a 109s elevator and shot up a couple of bombers. I guess what I'm getting at is this sim is just great fun and thankyou all for the hard work your doing

[ZaltysZ]

Static stall: 1G flight, your speed decreases, you increase AoA to compensate. Stall happens when critical AoA is reached.

Accelerated stall: same us above, but there must be >1G. In such condition, you need higher AoA than in 1G flight, because lift is countered not only by weight, but by sum of weight and centrifugal force.

Dynamic stall: you increase AoA past a critical value very quickly, vortex is created at leading edge, lift increases, then vortex detaches and you experience rapid loss of lift and sometimes even a high nose-down pitching.

I think, important things about dynamic stall is: amplitude and rate of AoA change, and increase of lift before the stall.

[Ataros]

Impressive mission from a sukhoi.ru member posted. Video of air attack and track of a tank attack are included. Works like a strategy game too: you can call reinforcements and schedule your tank attack carefully.
http://forum.1cpublishing.eu/showthread.php?t=28595

Worth flying and/or watching with external views.

[ACE-OF-ACES]

Originally Posted by ZaltysZ

Static stall: 1G flight, your speed decreases, you increase AoA to compensate. Stall happens when critical AoA is reached.

Accelerated stall: same us above, but there must be >1G. In such condition, you need higher AoA than in 1G flight, because lift is countered not only by weight, but by sum of weight and centrifugal force.

Dynamic stall: you increase AoA past a critical value very quickly, vortex is created at leading edge, lift increases, then vortex detaches and you experience rapid loss of lift and sometimes even a high nose-down pitching.

I think, important things about dynamic stall is: amplitude and rate of AoA change, and increase of lift before the stall.

Thanks for the feedback Zaltys..

Looking at your definitions of Accelerated and Dynamic..

Your dynamic def reads just like the link I posted.. Except there is no mention of how the variations in stall are due to the variations atmosphere.. From the link I posted they point out how the stall can vary due to the variation in wind (atmosphere). Other than that the two defs are very interchangeable.

One other thing, you stated you 'need higher AoA than in 1G flight'.. IMHO you should re-word that to read 'during a constant altitude banked turn the AoA will have to be higher than it would be during level flight (1g) at the same speed'.. That example is a little easier for most to visualize. It is also important to note the critical AoA at which the stall occurs is the same for all three cases.

[BlackSix]

There is good news. A list of questions has been transferred to Ilya. The answers will be published this Friday. You will find a lot of positive things. And finally you will get so interested in all the information about how the CloD will be merged with the sequels. Wait)

[Sven]

Thank you !!!

[MD_Titus]

*does a happy dance*

[Dano]

Originally Posted by BlackSix

There is good news. A list of questions has been transferred to Ilya. The answers will be published this Friday. You will find a lot of positive things. And finally you will get so interested in all the information about how the CloD will be merged with the sequels. Wait)

Nice, I predict it will keep the mob appeased for no less than one week and no more than two point three seven four weeks depending on how Mars and Jupiter are conjuncted (is that even a word?) at the time of a virgin being sacrificed in little whinging.

[Chivas]

Originally Posted by Dano

Nice, I predict it will keep the mob appeased for no less than one week and no more than two point three seven four weeks depending on how Mars and Jupiter are conjuncted (is that even a word?) at the time of a virgin being sacrificed in little whinging.

I disagree, there will be an unconstructive criticism within three pages of Fridays post.