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Solved: Realistic turn rate

155 MelucapLabs  4.5 years ago

I have started a replica of the F5E tiger II, and I want to make it as realistic as possible, including it’s flight model. However, I’ve noticed that the faster my plane goes, the faster it turns, which should not be the case.

Is there any solution to this? Currently my plane has the correct max turn rate, but at the ideal speed for the best turn rate, it turns horribly.

image of the plane

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    Add 2 brakes with stupid drag with pitch + roll and the same for the other one inverted in the same place

    4.2 years ago
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    25.5k Mustang51

    @MelucapLabs I really love how it’s looking so far. I’m the same though. I am taking forever to finish my build because I’m procrastinating the details part hahaha

    +1 4.5 years ago
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    @Mustang51 Thanks man. Here, I added the picture to the post (I have VTOL down to show the flaps + slats)
    Well haha, I don’t think I have a particular building style. I wouldn’t say that my build is particularly impressive, and my progress so far is absolutely horrible; did not even start to add details, nor the rudder! lol (I can be quite a perfectionist some times, and coupled with that annoying undo button it’s a huge waste of time) So keep in mind that this is not at all the finish product (for exemple, I need to add fuselage to my elevators to make them straight at the end, etc that sort of things)

    4.5 years ago
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    25.5k Mustang51

    @MelucapLabs it has to be a public link. So posting it on something like imgur or maybe sending it to someone or a server on pm on discord

    +1 4.5 years ago
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    @Mustang51 Well, I wanted to add a picture of the plane to my original post, but I have no idea how to put a screenshot (I used google photos to copy the link of my image but it just doesn’t work) What I am doing wrong?

    4.5 years ago
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    25.5k Mustang51

    @MelucapLabs sure thing. Mind if I take a look at it? I’m very curious to see your building style. If it supposed to be a surprise I understand though hahaha

    4.5 years ago
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    @Mustang51 thanks man but don’t expect it soon. My elevator wing uses rotators, which right now are at 200% speed, but I managed to overcome the problems of wobbles when pitching (by using the editor to make super wide but unrealistic wings tho), and it turns very smoothly. I’ll remember to put them at 20-40% for future builds, might always be handy.

    4.5 years ago
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    25.5k Mustang51

    @MelucapLabs awesome man! I’m actually really excited to see this build when it’s done. How did you make the elevator wing? Is it just a scaled down wing part with a control surface or does it move on a rotator? If you use rotators and make the speed around 20-40%, it will pitch quite smoothly

    4.5 years ago
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    @Mustang51 Of course I made my own.... I’ve spend the last two months on it. It’s got flaps and slats, which took me ages to make work (well given that I am new to the game and knew nothing about it, this is probably why it took me so long)

    4.5 years ago
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    25.5k Mustang51

    @MelucapLabs sure thing! Are your wings the stock game wings or did you make your own out of fuselage parts?

    4.5 years ago
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    @DeezDucks Yep I’ve seen this superb plane too. I’ve payed close attention to it.

    4.5 years ago
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    @Mustang51 Currently I have worked a lot on this, to achieve an ok acceleration, the right dry thrust speed and top speed, the right take of speed, etc. For now, I don’t think I need any help on this, but thanks for offering it!

    4.5 years ago
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    @vcharng I’ll try the PID controller too once I know a bit more about funky trees. Thanks!

    4.5 years ago
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    @SnoWFLakE0s Cool to know it’s perfectly possible. You are right, I don’t have DCS or any other sim like that and I have spent hours researching for scraps of information. Also, thanks for reminding me that I really need to read your Funky trees guide.

    4.5 years ago
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    @edensk Turns out it worked perfectly!
    @randomusername This worked fine too! However I needed to make more changes to the rotators to make it work.

    Again, thank you for your help.

    +2 4.5 years ago
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    Mod DeezDucks

    ChiChiWerx built an excellent F-20 Tigershark, which shares almost the same airframe as the F-5, Maybe give his a try to see how yours could fly.

    +1 4.5 years ago
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    67.1k SnoWFLakE0s

    Hey, the physics in SP are actually pretty good when you use them correctly.
    Funky trees really expands the options here for doing a lot of things, but generally it's best if you have data from flight manuals that tell you control surface effectiveness relative to IAS. Usually it turns out something like logarithm, so as long as you have the data you can make it incredibly realistic.

    +1 4.5 years ago
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    9,445 vcharng

    you can use a PID controller to limit the Gs, or use a speed-dependent control surface scale to limit the angle of control surfaces.

    And unfortunately, it is actually pretty difficult to make a realisitic turning model in SP due to the physics differences.

    +1 4.5 years ago
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    16.6k DarthAbhinav

    Pfft, nonsense. The faster it turns, the better. I love planes that do a double 360 in 0.5 seconds.

    +1 4.5 years ago
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    25.5k Mustang51

    To change this really depends on how you’re building the aircraft. The techniques you are using will dictate how you fix it but a lot of it will be to do with engine power, wing area, CoM location in relevance to the CoL, control surface area (if you have any), and drag. If you can post the plane unlisted and tag me in the comments, I can advise you on what to do for your specific case :)

    +2 4.5 years ago
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    @edensk @randomusername Thank you! I’ll try out these formulas tomorrow.

    +1 4.5 years ago
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    16.5k edensk

    Use the following code as the input for the elevators:


    clamp(Pitch/(1+ IAS/300), -1, 1)


    Modify the "300" to adjust how much the elevator's range changes

    +2 4.5 years ago