dcn
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Posts posted by dcn
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4小时前，Doc3908说：
It's been a long time since there have been any posts about the La-7. Just curious if it's already been submitted to ED for evaluation...
La-7 was shot down by F-4E.
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I have been troubled by this issue for over a week now, and there are two tracks that will crash as soon as I play track, and they are not multiplayer tracks.
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16小时前，Hiob说：
It is not a matter of "if" but a matter of how big the effect is. Compared to the rotor of a helicopter, the rotating mass is of course very concentrated and probably a lot smaller. It is probably negligible for practical purposes (meaning that a pilot would compensate without even thinking about it - like he wouldn't for crosswind e.g.).
If jet aircraft really has gyroscopic precession caused by jet engine,I think there should be torque reaction too,but it seems to be imperceptible.That is to say, this cannot be manifested at all.
16小时前，Hiob说：But what you did, pulling exactly straight back (by use of artificial input possibilities) may show the small effects - IF they are modelled - which I don't know.
I tested AI F-86F and found it still rolls when pulling the stick.And I found F-86F rolls when pulling +G even without any input.
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LOL you replied too quickly and I didn’t have time to change it.
21分钟前，dcn说：So jet aircraft really has gyroscopic precession caused by gyrocopic precesstion?
So jet aircraft really has gyroscopic precession caused by jet engine?
16分钟前，Hiob说：Why should they be exempted from it? It's physics - not a choice. The rotating mass isn't THAT big, but it rotates fast. Question is, if it is modelled and therefore the root cause for you're observation. That I don't know od course.
Yeah I heard someone say there is but its impact seems to be small,I doubt it would cause roll when pulling the stick.
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5小时前，Insonia说：
Another is torque-induced gyroscopic precession, only occurs when the aircraft pitches (lateral axis) or yaws (vertical axis) not roll, motion against the inertia axes. which causes the nose to slightly pitch diagonally.
the swept wing is more sensitive to the angle of attack and angle of slip. Adverse yaw might be the dominant force tilting the aircraft in that accident. However, oscillating the nose will oscillate the Δβ can only deteriorate the situation.
I doubt it.I don't believe jet aircraft has gyrocopic precesstion caused by jet engine.
5小时前，Insonia说：Btw , if you oscillate the nose up and DOWN in DCS ED modules. it rocks the nose diagonally, which raises my suspicion. But who knows, maybe their jet PFM API also share the same math with their warbirds..
I looked into all ED jets a few days ago and found the direction the aircraft rolls seems to be related to the direction of engine rotation.For example,the J47 engine of F-86F rotates counterclockwise when look from front and F-86F rolls right when pulling the stick.The VK-1 engine of MiG-15bis rolls clockwise when look from front and MiG-15bis rolls left when pulling the stick.So jet aircraft really has gyroscopic precession caused by jet engine?
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2小时前，dcn说：
Never heard jet aircraft has gyrocopic precesstion before.
I mean never heard jet aircraft has gyrocopic precesstion caused by jet engine before.
1小时前，Insonia说：I have read this 10 days ago but I still doubt it.
1小时前，Insonia说：We still just don't know what's happening within the game. And probably they don't want to answer...
Yup,I think so.
1小时前，Insonia说：Gyroscopic effect interacts with other coupling effect and lacks aerodynamic stability at low speed. can trap pilot into a hazard known as "saber dance"
The sabre dance has nothing to do with inertia coupling.
From Wikipedia:'Another control problem suffered by the type stemmed from the handling characteristics of the swept wing at high angles of attack; as the aircraft approached stall speeds, loss of lift on the tips of the wings caused a violent pitch-up. This particular phenomenon (which could easily be fatal at low altitude with insufficient time to recover) became known as the "Sabre dance".'
1小时前，Insonia说：Unrelated documents probably have no intention to cover this topic.
The first picture is from Airplane Flying Handbook FAA-H-8083-3C.
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I found F-86F rolls when pulling the stick when bombing with LABS,then I found that all ED jets roll when pulling the stick while third party jets don't roll when pulling the stick,so I posted this topic.
2024/1/22 PM2点20分，Insonia说：Is this has something to do with engine gyroscopic precession?
Never heard jet aircraft has gyrocopic precesstion before.
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21小时前，Insonia说：
ED allows the 3rd-party use what they called the EFM (external model) letting dev have the freedom to design their own mathematics.
ED themselves use what they call PFM (professional flight model). probably all share the same mathematical foundations.
If only one third party's jet don't roll when pulling the stick,maybe he didn't do it right,but it happens to all third parties.
20小时前，BIGNEWY说：all seems normal and correct here, it maybe worth checking your device calibration
test done in viper, no roll in loop
No,you roll.You can see bank angle clearly in F2 view status bar.
21小时前，BIGNEWY说：it maybe worth checking your device calibration
I said I tested them by keyboard,so it's not due to my device.
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2024/1/20 PM4点48分，Insonia说：
"rolling" while pulling. or Is it yawing? and the rolling just side effect by slip stream and vstablizer torque?
I think it's roll.
2024/1/20 PM4点48分，Insonia说：Angular torque IRL can be caused by on-aerodynamic forces like engine gyroscopic force coupling, GCs and aerodynamic factors like unequal disturbances and anomalies from increased AOA. It is unreasonable to expect zero direction changes while drastically changing pitch attitude and making no pilot corrections.
I don't know whether what you said is right,if so,why third party jets won't roll when pulling the stick.
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All ED jets can't loop in vertical plane perfectly when the only input is pulling the stick,they will roll,while third party jets can(I tested AV-8B,AJS-37,C-101,F-14B,JF-17,MiG-21bis).To eliminate rolling I tested them with keyboard 'down' to provide a constant amount of stick pull,and there is no wind,no turbulence and I found it's not due to fuel.Is it bug?
F-86F.trk MiG-15bis.trk F-5E.trk FA-18C.trk F-16C.trk F-15C.trk A-10C II.trk L-39C.trk AV-8B.trk
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13小时前，Ala13_ManOWar说：
Yep, not unexpected since they already said there would be proper assets for the time of both aircraft (Corsair & Hellcat) but nice to see it confirmed.
Hope it could be announced soon.
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2小时前，Doc3908说：
Funny how everyone gets excited about a tail sticking out of Santa's bag in a cartoon video, yet we are still waiting for the La-7 that we expected to come last year...
You knew the reason.
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2024/1/9 PM4点05分，pepin1234说：
under the tree. Left bag have a Su-17 tail and right one seems to be a Po-2
Amazing discovery!
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21小时前，SOLIDKREATE说：
Wowe I made this logo a long ass time ago. Glad to see it still being used. The aircraft inside is a CA-12 Boomerang.
19小时前，YoYo说：Im sure, Zeke is AI only. Nobody confirm it as flyable and Im sure, dont be so optimist too early.
I believe it's flyable.
17小时前，Art-J说：At this point, either that Hayate was just a fancy background item thrown in to make the '22 wish postcard look cooler, or it is something in so rudimentary stages of development that it falls into "beyond" timefreame category
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At least now AI Zero is officially a thing, though, and that's the most important aspect of the yesterday's video (in the context of PTO).
Waiting for further news.
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2023/1/1 AM12点37分，Art-J说：
@dcn - That's Ki-84, which is totally unexpected!
Sorry I didn't expect that they would post a picture of Ki-84 and took it for granted that it was a Zero.Someone found that the picture was from War Thunder Wiki,that is quite interesting.And it doesn't appear in 2024 and beyond video.
Would ED call AI 'are already in development'?Flyable A6M5c confirmed?And they used 'are' here,so Ki-84 is possible?
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2023/11/16 PM12点38分，Doc3908说：
I think it comes down to financial planning: The big F-4E release is imminent. I don't think ED will release two planes simultaneously - most people will have to choose which one to buy and it'll eat into the profits of ED and the developers. If they release the La-7 (or whichever is next) a month or two later, then there will be no competition for the F-4E and eventually people will most likely end up buying both. So many models were supposed to come out in 2023 - the F-4E, the F-4U Corsair, the A-6 (???), the La-7. Let's hope 2024 will be more bountiful.
Even though I don’t want to believe it, as time goes by, I feel more and more that you are right...
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3小时前，YoYo说：
The first official biplane for DCS
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CE2:
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20小时前，Doc3908说：
I think it comes down to financial planning: The big F-4E release is imminent. I don't think ED will release two planes simultaneously - most people will have to choose which one to buy and it'll eat into the profits of ED and the developers. If they release the La-7 (or whichever is next) a month or two later, then there will be no competition for the F-4E and eventually people will most likely end up buying both. So many models were supposed to come out in 2023 - the F-4E, the F-4U Corsair, the A-6 (???), the La-7. Let's hope 2024 will be more bountiful.
I think when a module is ready for release they will release it.It's ridiculous to withhold a module that is ready to release.As for F-4E,we even don't know whether it would be released in 2023.
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2023/9/10 PM9点35分，Plexus说：
Dear pilots!
With this latest development update, we are pleased to announce the successful completion of the intricate flight model tuning process. To mark this achievement, we present our new video showcasing a demonstration flight of the aircraft. From this point forward, we are preparing the module for ED flightworthiness certification. This marks a significant milestone on our journey towards module release!
Strange,if OctopusG submitted La-7 to ED for test shortly after September 10th,it should have been released.Referring to MB-339, IndiaFoxtEcho announced that they were submitting MB-339 to ED for final test on September 3rd 2022 and it was released on October 28th 2022.
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3小时前，rkk01说：
Don’t want to be a doom-monger, but ENCLOSRE|RELEASE is also on previous F4U images
presumably just for emergency rescue crews
You are right.It's so embarrassing
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ENCLOSUREIRELEASE
end of November Corsair I release?November 28th?
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6小时前，kablamoman说：
I think this is another issue with the manual that snuck in due to changing specifications throughout the war. This video may help clear things up for you (or confuse you even more):
The long and short of it is that for a brief period of about 2 months at the end of '44 (more details here), there was a 3 minute "increased take-off power" spec ("Sonderstartspitze") that was useable up to 500m that was activated by the Notzug pull handle (bowden cable in the video). The Jumo engines that were approved for this were designated 213 A G-1, but this designation was soon revoked when the engine regime was found to be unreliable, and the Notzug mode for the MBG was again restricted to 2700 RPM/1.55 ata.
It's so nice of you,thank you!
2022/8/26 PM1点32分，dcn说：The MBG emergency mode handle switches the MBG to manual operation by cutting off pressurised oil.In case of MBG malfunction,it allows to proceed flight using the manual throttle valve.Normally,this throttle fully opens at 40 degrees of the throttle giving room for further automatic control.In manual mode,its range is extended up to 90 degrees or full throttle level range.Due to engine overstressing,the throttle must not be advanced beyond 2700 RPM or 60 degrees of its travel.
The 40 degrees of fully opend normal throttle position seems strange,in the table,40 degrees of throttle position only gives about 2300 RPM,does this mean engine speed can only reach about 2300 RPM at full throttle position with MBG emergency mode handle not pulled?
DEVELOPMENT NOTES
in DCS: La-7
Posted
Yeah it seems that they saw what we said here.